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android / platform / external / chromium_org / third_party / mesa / src / f2ba759 / . / src / mesa / state_tracker / st_glsl_to_tgsi.cpp
blob: 8799c2da42958514c5b05aa205cbb94664a0142e [file] [log] [blame]
/*
* Copyright (C) 2005-2007 Brian Paul All Rights Reserved.
* Copyright (C) 2008 VMware, Inc. All Rights Reserved.
* Copyright © 2010 Intel Corporation
* Copyright © 2011 Bryan Cain
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
/**
* \file glsl_to_tgsi.cpp
*
* Translate GLSL IR to TGSI.
*/
#include <stdio.h>
#include "main/compiler.h"
#include "ir.h"
#include "ir_visitor.h"
#include "ir_print_visitor.h"
#include "ir_expression_flattening.h"
#include "glsl_types.h"
#include "glsl_parser_extras.h"
#include "../glsl/program.h"
#include "ir_optimization.h"
#include "ast.h"
#include "main/mtypes.h"
#include "main/shaderobj.h"
#include "program/hash_table.h"
extern "C" {
#include "main/shaderapi.h"
#include "main/uniforms.h"
#include "program/prog_instruction.h"
#include "program/prog_optimize.h"
#include "program/prog_print.h"
#include "program/program.h"
#include "program/prog_parameter.h"
#include "program/sampler.h"
#include "pipe/p_compiler.h"
#include "pipe/p_context.h"
#include "pipe/p_screen.h"
#include "pipe/p_shader_tokens.h"
#include "pipe/p_state.h"
#include "util/u_math.h"
#include "tgsi/tgsi_ureg.h"
#include "tgsi/tgsi_info.h"
#include "st_context.h"
#include "st_program.h"
#include "st_glsl_to_tgsi.h"
#include "st_mesa_to_tgsi.h"
}
#define PROGRAM_IMMEDIATE PROGRAM_FILE_MAX
#define PROGRAM_ANY_CONST ((1 << PROGRAM_LOCAL_PARAM) | \
(1 << PROGRAM_ENV_PARAM) | \
(1 << PROGRAM_STATE_VAR) | \
(1 << PROGRAM_NAMED_PARAM) | \
(1 << PROGRAM_CONSTANT) | \
(1 << PROGRAM_UNIFORM))
/**
* Maximum number of temporary registers.
*
* It is too big for stack allocated arrays -- it will cause stack overflow on
* Windows and likely Mac OS X.
*/
#define MAX_TEMPS 4096
/* will be 4 for GLSL 4.00 */
#define MAX_GLSL_TEXTURE_OFFSET 1
class st_src_reg;
class st_dst_reg;
static int swizzle_for_size(int size);
/**
* This struct is a corresponding struct to TGSI ureg_src.
*/
class st_src_reg {
public:
st_src_reg(gl_register_file file, int index, const glsl_type *type)
{
this->file = file;
this->index = index;
if (type && (type->is_scalar() || type->is_vector() || type->is_matrix()))
this->swizzle = swizzle_for_size(type->vector_elements);
else
this->swizzle = SWIZZLE_XYZW;
this->negate = 0;
this->type = type ? type->base_type : GLSL_TYPE_ERROR;
this->reladdr = NULL;
}
st_src_reg(gl_register_file file, int index, int type)
{
this->type = type;
this->file = file;
this->index = index;
this->swizzle = SWIZZLE_XYZW;
this->negate = 0;
this->reladdr = NULL;
}
st_src_reg()
{
this->type = GLSL_TYPE_ERROR;
this->file = PROGRAM_UNDEFINED;
this->index = 0;
this->swizzle = 0;
this->negate = 0;
this->reladdr = NULL;
}
explicit st_src_reg(st_dst_reg reg);
gl_register_file file; /**< PROGRAM_* from Mesa */
int index; /**< temporary index, VERT_ATTRIB_*, FRAG_ATTRIB_*, etc. */
GLuint swizzle; /**< SWIZZLE_XYZWONEZERO swizzles from Mesa. */
int negate; /**< NEGATE_XYZW mask from mesa */
int type; /** GLSL_TYPE_* from GLSL IR (enum glsl_base_type) */
/** Register index should be offset by the integer in this reg. */
st_src_reg *reladdr;
};
class st_dst_reg {
public:
st_dst_reg(gl_register_file file, int writemask, int type)
{
this->file = file;
this->index = 0;
this->writemask = writemask;
this->cond_mask = COND_TR;
this->reladdr = NULL;
this->type = type;
}
st_dst_reg()
{
this->type = GLSL_TYPE_ERROR;
this->file = PROGRAM_UNDEFINED;
this->index = 0;
this->writemask = 0;
this->cond_mask = COND_TR;
this->reladdr = NULL;
}
explicit st_dst_reg(st_src_reg reg);
gl_register_file file; /**< PROGRAM_* from Mesa */
int index; /**< temporary index, VERT_ATTRIB_*, FRAG_ATTRIB_*, etc. */
int writemask; /**< Bitfield of WRITEMASK_[XYZW] */
GLuint cond_mask:4;
int type; /** GLSL_TYPE_* from GLSL IR (enum glsl_base_type) */
/** Register index should be offset by the integer in this reg. */
st_src_reg *reladdr;
};
st_src_reg::st_src_reg(st_dst_reg reg)
{
this->type = reg.type;
this->file = reg.file;
this->index = reg.index;
this->swizzle = SWIZZLE_XYZW;
this->negate = 0;
this->reladdr = reg.reladdr;
}
st_dst_reg::st_dst_reg(st_src_reg reg)
{
this->type = reg.type;
this->file = reg.file;
this->index = reg.index;
this->writemask = WRITEMASK_XYZW;
this->cond_mask = COND_TR;
this->reladdr = reg.reladdr;
}
class glsl_to_tgsi_instruction : public exec_node {
public:
/* Callers of this ralloc-based new need not call delete. It's
* easier to just ralloc_free 'ctx' (or any of its ancestors). */
static void* operator new(size_t size, void *ctx)
{
void *node;
node = rzalloc_size(ctx, size);
assert(node != NULL);
return node;
}
unsigned op;
st_dst_reg dst;
st_src_reg src[3];
/** Pointer to the ir source this tree came from for debugging */
ir_instruction *ir;
GLboolean cond_update;
bool saturate;
int sampler; /**< sampler index */
int tex_target; /**< One of TEXTURE_*_INDEX */
GLboolean tex_shadow;
struct tgsi_texture_offset tex_offsets[MAX_GLSL_TEXTURE_OFFSET];
unsigned tex_offset_num_offset;
int dead_mask; /**< Used in dead code elimination */
class function_entry *function; /* Set on TGSI_OPCODE_CAL or TGSI_OPCODE_BGNSUB */
};
class variable_storage : public exec_node {
public:
variable_storage(ir_variable *var, gl_register_file file, int index)
: file(file), index(index), var(var)
{
/* empty */
}
gl_register_file file;
int index;
ir_variable *var; /* variable that maps to this, if any */
};
class immediate_storage : public exec_node {
public:
immediate_storage(gl_constant_value *values, int size, int type)
{
memcpy(this->values, values, size * sizeof(gl_constant_value));
this->size = size;
this->type = type;
}
gl_constant_value values[4];
int size; /**< Number of components (1-4) */
int type; /**< GL_FLOAT, GL_INT, GL_BOOL, or GL_UNSIGNED_INT */
};
class function_entry : public exec_node {
public:
ir_function_signature *sig;
/**
* identifier of this function signature used by the program.
*
* At the point that TGSI instructions for function calls are
* generated, we don't know the address of the first instruction of
* the function body. So we make the BranchTarget that is called a
* small integer and rewrite them during set_branchtargets().
*/
int sig_id;
/**
* Pointer to first instruction of the function body.
*
* Set during function body emits after main() is processed.
*/
glsl_to_tgsi_instruction *bgn_inst;
/**
* Index of the first instruction of the function body in actual TGSI.
*
* Set after conversion from glsl_to_tgsi_instruction to TGSI.
*/
int inst;
/** Storage for the return value. */
st_src_reg return_reg;
};
class glsl_to_tgsi_visitor : public ir_visitor {
public:
glsl_to_tgsi_visitor();
~glsl_to_tgsi_visitor();
function_entry *current_function;
struct gl_context *ctx;
struct gl_program *prog;
struct gl_shader_program *shader_program;
struct gl_shader_compiler_options *options;
int next_temp;
int num_address_regs;
int samplers_used;
bool indirect_addr_temps;
bool indirect_addr_consts;
int glsl_version;
bool native_integers;
variable_storage *find_variable_storage(ir_variable *var);
int add_constant(gl_register_file file, gl_constant_value values[4],
int size, int datatype, GLuint *swizzle_out);
function_entry *get_function_signature(ir_function_signature *sig);
st_src_reg get_temp(const glsl_type *type);
void reladdr_to_temp(ir_instruction *ir, st_src_reg *reg, int *num_reladdr);
st_src_reg st_src_reg_for_float(float val);
st_src_reg st_src_reg_for_int(int val);
st_src_reg st_src_reg_for_type(int type, int val);
/**
* \name Visit methods
*
* As typical for the visitor pattern, there must be one \c visit method for
* each concrete subclass of \c ir_instruction. Virtual base classes within
* the hierarchy should not have \c visit methods.
*/
/*@{*/
virtual void visit(ir_variable *);
virtual void visit(ir_loop *);
virtual void visit(ir_loop_jump *);
virtual void visit(ir_function_signature *);
virtual void visit(ir_function *);
virtual void visit(ir_expression *);
virtual void visit(ir_swizzle *);
virtual void visit(ir_dereference_variable *);
virtual void visit(ir_dereference_array *);
virtual void visit(ir_dereference_record *);
virtual void visit(ir_assignment *);
virtual void visit(ir_constant *);
virtual void visit(ir_call *);
virtual void visit(ir_return *);
virtual void visit(ir_discard *);
virtual void visit(ir_texture *);
virtual void visit(ir_if *);
/*@}*/
st_src_reg result;
/** List of variable_storage */
exec_list variables;
/** List of immediate_storage */
exec_list immediates;
unsigned num_immediates;
/** List of function_entry */
exec_list function_signatures;
int next_signature_id;
/** List of glsl_to_tgsi_instruction */
exec_list instructions;
glsl_to_tgsi_instruction *emit(ir_instruction *ir, unsigned op);
glsl_to_tgsi_instruction *emit(ir_instruction *ir, unsigned op,
st_dst_reg dst, st_src_reg src0);
glsl_to_tgsi_instruction *emit(ir_instruction *ir, unsigned op,
st_dst_reg dst, st_src_reg src0, st_src_reg src1);
glsl_to_tgsi_instruction *emit(ir_instruction *ir, unsigned op,
st_dst_reg dst,
st_src_reg src0, st_src_reg src1, st_src_reg src2);
unsigned get_opcode(ir_instruction *ir, unsigned op,
st_dst_reg dst,
st_src_reg src0, st_src_reg src1);
/**
* Emit the correct dot-product instruction for the type of arguments
*/
glsl_to_tgsi_instruction *emit_dp(ir_instruction *ir,
st_dst_reg dst,
st_src_reg src0,
st_src_reg src1,
unsigned elements);
void emit_scalar(ir_instruction *ir, unsigned op,
st_dst_reg dst, st_src_reg src0);
void emit_scalar(ir_instruction *ir, unsigned op,
st_dst_reg dst, st_src_reg src0, st_src_reg src1);
void try_emit_float_set(ir_instruction *ir, unsigned op, st_dst_reg dst);
void emit_arl(ir_instruction *ir, st_dst_reg dst, st_src_reg src0);
void emit_scs(ir_instruction *ir, unsigned op,
st_dst_reg dst, const st_src_reg &src);
bool try_emit_mad(ir_expression *ir,
int mul_operand);
bool try_emit_mad_for_and_not(ir_expression *ir,
int mul_operand);
bool try_emit_sat(ir_expression *ir);
void emit_swz(ir_expression *ir);
bool process_move_condition(ir_rvalue *ir);
void simplify_cmp(void);
void rename_temp_register(int index, int new_index);
int get_first_temp_read(int index);
int get_first_temp_write(int index);
int get_last_temp_read(int index);
int get_last_temp_write(int index);
void copy_propagate(void);
void eliminate_dead_code(void);
int eliminate_dead_code_advanced(void);
void merge_registers(void);
void renumber_registers(void);
void *mem_ctx;
};
static st_src_reg undef_src = st_src_reg(PROGRAM_UNDEFINED, 0, GLSL_TYPE_ERROR);
static st_dst_reg undef_dst = st_dst_reg(PROGRAM_UNDEFINED, SWIZZLE_NOOP, GLSL_TYPE_ERROR);
static st_dst_reg address_reg = st_dst_reg(PROGRAM_ADDRESS, WRITEMASK_X, GLSL_TYPE_FLOAT);
static void
fail_link(struct gl_shader_program *prog, const char *fmt, ...) PRINTFLIKE(2, 3);
static void
fail_link(struct gl_shader_program *prog, const char *fmt, ...)
{
va_list args;
va_start(args, fmt);
ralloc_vasprintf_append(&prog->InfoLog, fmt, args);
va_end(args);
prog->LinkStatus = GL_FALSE;
}
static int
swizzle_for_size(int size)
{
int size_swizzles[4] = {
MAKE_SWIZZLE4(SWIZZLE_X, SWIZZLE_X, SWIZZLE_X, SWIZZLE_X),
MAKE_SWIZZLE4(SWIZZLE_X, SWIZZLE_Y, SWIZZLE_Y, SWIZZLE_Y),
MAKE_SWIZZLE4(SWIZZLE_X, SWIZZLE_Y, SWIZZLE_Z, SWIZZLE_Z),
MAKE_SWIZZLE4(SWIZZLE_X, SWIZZLE_Y, SWIZZLE_Z, SWIZZLE_W),
};
assert((size >= 1) && (size <= 4));
return size_swizzles[size - 1];
}
static bool
is_tex_instruction(unsigned opcode)
{
const tgsi_opcode_info* info = tgsi_get_opcode_info(opcode);
return info->is_tex;
}
static unsigned
num_inst_dst_regs(unsigned opcode)
{
const tgsi_opcode_info* info = tgsi_get_opcode_info(opcode);
return info->num_dst;
}
static unsigned
num_inst_src_regs(unsigned opcode)
{
const tgsi_opcode_info* info = tgsi_get_opcode_info(opcode);
return info->is_tex ? info->num_src - 1 : info->num_src;
}
glsl_to_tgsi_instruction *
glsl_to_tgsi_visitor::emit(ir_instruction *ir, unsigned op,
st_dst_reg dst,
st_src_reg src0, st_src_reg src1, st_src_reg src2)
{
glsl_to_tgsi_instruction *inst = new(mem_ctx) glsl_to_tgsi_instruction();
int num_reladdr = 0, i;
op = get_opcode(ir, op, dst, src0, src1);
/* If we have to do relative addressing, we want to load the ARL
* reg directly for one of the regs, and preload the other reladdr
* sources into temps.
*/
num_reladdr += dst.reladdr != NULL;
num_reladdr += src0.reladdr != NULL;
num_reladdr += src1.reladdr != NULL;
num_reladdr += src2.reladdr != NULL;
reladdr_to_temp(ir, &src2, &num_reladdr);
reladdr_to_temp(ir, &src1, &num_reladdr);
reladdr_to_temp(ir, &src0, &num_reladdr);
if (dst.reladdr) {
emit_arl(ir, address_reg, *dst.reladdr);
num_reladdr--;
}
assert(num_reladdr == 0);
inst->op = op;
inst->dst = dst;
inst->src[0] = src0;
inst->src[1] = src1;
inst->src[2] = src2;
inst->ir = ir;
inst->dead_mask = 0;
inst->function = NULL;
if (op == TGSI_OPCODE_ARL || op == TGSI_OPCODE_UARL)
this->num_address_regs = 1;
/* Update indirect addressing status used by TGSI */
if (dst.reladdr) {
switch(dst.file) {
case PROGRAM_TEMPORARY:
this->indirect_addr_temps = true;
break;
case PROGRAM_LOCAL_PARAM:
case PROGRAM_ENV_PARAM:
case PROGRAM_STATE_VAR:
case PROGRAM_NAMED_PARAM:
case PROGRAM_CONSTANT:
case PROGRAM_UNIFORM:
this->indirect_addr_consts = true;
break;
case PROGRAM_IMMEDIATE:
assert(!"immediates should not have indirect addressing");
break;
default:
break;
}
}
else {
for (i=0; i<3; i++) {
if(inst->src[i].reladdr) {
switch(inst->src[i].file) {
case PROGRAM_TEMPORARY:
this->indirect_addr_temps = true;
break;
case PROGRAM_LOCAL_PARAM:
case PROGRAM_ENV_PARAM:
case PROGRAM_STATE_VAR:
case PROGRAM_NAMED_PARAM:
case PROGRAM_CONSTANT:
case PROGRAM_UNIFORM:
this->indirect_addr_consts = true;
break;
case PROGRAM_IMMEDIATE:
assert(!"immediates should not have indirect addressing");
break;
default:
break;
}
}
}
}
this->instructions.push_tail(inst);
if (native_integers)
try_emit_float_set(ir, op, dst);
return inst;
}
glsl_to_tgsi_instruction *
glsl_to_tgsi_visitor::emit(ir_instruction *ir, unsigned op,
st_dst_reg dst, st_src_reg src0, st_src_reg src1)
{
return emit(ir, op, dst, src0, src1, undef_src);
}
glsl_to_tgsi_instruction *
glsl_to_tgsi_visitor::emit(ir_instruction *ir, unsigned op,
st_dst_reg dst, st_src_reg src0)
{
assert(dst.writemask != 0);
return emit(ir, op, dst, src0, undef_src, undef_src);
}
glsl_to_tgsi_instruction *
glsl_to_tgsi_visitor::emit(ir_instruction *ir, unsigned op)
{
return emit(ir, op, undef_dst, undef_src, undef_src, undef_src);
}
/**
* Emits the code to convert the result of float SET instructions to integers.
*/
void
glsl_to_tgsi_visitor::try_emit_float_set(ir_instruction *ir, unsigned op,
st_dst_reg dst)
{
if ((op == TGSI_OPCODE_SEQ ||
op == TGSI_OPCODE_SNE ||
op == TGSI_OPCODE_SGE ||
op == TGSI_OPCODE_SLT))
{
st_src_reg src = st_src_reg(dst);
src.negate = ~src.negate;
dst.type = GLSL_TYPE_FLOAT;
emit(ir, TGSI_OPCODE_F2I, dst, src);
}
}
/**
* Determines whether to use an integer, unsigned integer, or float opcode
* based on the operands and input opcode, then emits the result.
*/
unsigned
glsl_to_tgsi_visitor::get_opcode(ir_instruction *ir, unsigned op,
st_dst_reg dst,
st_src_reg src0, st_src_reg src1)
{
int type = GLSL_TYPE_FLOAT;
assert(src0.type != GLSL_TYPE_ARRAY);
assert(src0.type != GLSL_TYPE_STRUCT);
assert(src1.type != GLSL_TYPE_ARRAY);
assert(src1.type != GLSL_TYPE_STRUCT);
if (src0.type == GLSL_TYPE_FLOAT || src1.type == GLSL_TYPE_FLOAT)
type = GLSL_TYPE_FLOAT;
else if (native_integers)
type = src0.type == GLSL_TYPE_BOOL ? GLSL_TYPE_INT : src0.type;
#define case4(c, f, i, u) \
case TGSI_OPCODE_##c: \
if (type == GLSL_TYPE_INT) op = TGSI_OPCODE_##i; \
else if (type == GLSL_TYPE_UINT) op = TGSI_OPCODE_##u; \
else op = TGSI_OPCODE_##f; \
break;
#define case3(f, i, u) case4(f, f, i, u)
#define case2fi(f, i) case4(f, f, i, i)
#define case2iu(i, u) case4(i, LAST, i, u)
switch(op) {
case2fi(ADD, UADD);
case2fi(MUL, UMUL);
case2fi(MAD, UMAD);
case3(DIV, IDIV, UDIV);
case3(MAX, IMAX, UMAX);
case3(MIN, IMIN, UMIN);
case2iu(MOD, UMOD);
case2fi(SEQ, USEQ);
case2fi(SNE, USNE);
case3(SGE, ISGE, USGE);
case3(SLT, ISLT, USLT);
case2iu(ISHR, USHR);
case2fi(SSG, ISSG);
case3(ABS, IABS, IABS);
default: break;
}
assert(op != TGSI_OPCODE_LAST);
return op;
}
glsl_to_tgsi_instruction *
glsl_to_tgsi_visitor::emit_dp(ir_instruction *ir,
st_dst_reg dst, st_src_reg src0, st_src_reg src1,
unsigned elements)
{
static const unsigned dot_opcodes[] = {
TGSI_OPCODE_DP2, TGSI_OPCODE_DP3, TGSI_OPCODE_DP4
};
return emit(ir, dot_opcodes[elements - 2], dst, src0, src1);
}
/**
* Emits TGSI scalar opcodes to produce unique answers across channels.
*
* Some TGSI opcodes are scalar-only, like ARB_fp/vp. The src X
* channel determines the result across all channels. So to do a vec4
* of this operation, we want to emit a scalar per source channel used
* to produce dest channels.
*/
void
glsl_to_tgsi_visitor::emit_scalar(ir_instruction *ir, unsigned op,
st_dst_reg dst,
st_src_reg orig_src0, st_src_reg orig_src1)
{
int i, j;
int done_mask = ~dst.writemask;
/* TGSI RCP is a scalar operation splatting results to all channels,
* like ARB_fp/vp. So emit as many RCPs as necessary to cover our
* dst channels.
*/
for (i = 0; i < 4; i++) {
GLuint this_mask = (1 << i);
glsl_to_tgsi_instruction *inst;
st_src_reg src0 = orig_src0;
st_src_reg src1 = orig_src1;
if (done_mask & this_mask)
continue;
GLuint src0_swiz = GET_SWZ(src0.swizzle, i);
GLuint src1_swiz = GET_SWZ(src1.swizzle, i);
for (j = i + 1; j < 4; j++) {
/* If there is another enabled component in the destination that is
* derived from the same inputs, generate its value on this pass as
* well.
*/
if (!(done_mask & (1 << j)) &&
GET_SWZ(src0.swizzle, j) == src0_swiz &&
GET_SWZ(src1.swizzle, j) == src1_swiz) {
this_mask |= (1 << j);
}
}
src0.swizzle = MAKE_SWIZZLE4(src0_swiz, src0_swiz,
src0_swiz, src0_swiz);
src1.swizzle = MAKE_SWIZZLE4(src1_swiz, src1_swiz,
src1_swiz, src1_swiz);
inst = emit(ir, op, dst, src0, src1);
inst->dst.writemask = this_mask;
done_mask |= this_mask;
}
}
void
glsl_to_tgsi_visitor::emit_scalar(ir_instruction *ir, unsigned op,
st_dst_reg dst, st_src_reg src0)
{
st_src_reg undef = undef_src;
undef.swizzle = SWIZZLE_XXXX;
emit_scalar(ir, op, dst, src0, undef);
}
void
glsl_to_tgsi_visitor::emit_arl(ir_instruction *ir,
st_dst_reg dst, st_src_reg src0)
{
int op = TGSI_OPCODE_ARL;
if (src0.type == GLSL_TYPE_INT || src0.type == GLSL_TYPE_UINT)
op = TGSI_OPCODE_UARL;
emit(NULL, op, dst, src0);
}
/**
* Emit an TGSI_OPCODE_SCS instruction
*
* The \c SCS opcode functions a bit differently than the other TGSI opcodes.
* Instead of splatting its result across all four components of the
* destination, it writes one value to the \c x component and another value to
* the \c y component.
*
* \param ir IR instruction being processed
* \param op Either \c TGSI_OPCODE_SIN or \c TGSI_OPCODE_COS depending
* on which value is desired.
* \param dst Destination register
* \param src Source register
*/
void
glsl_to_tgsi_visitor::emit_scs(ir_instruction *ir, unsigned op,
st_dst_reg dst,
const st_src_reg &src)
{
/* Vertex programs cannot use the SCS opcode.
*/
if (this->prog->Target == GL_VERTEX_PROGRAM_ARB) {
emit_scalar(ir, op, dst, src);
return;
}
const unsigned component = (op == TGSI_OPCODE_SIN) ? 0 : 1;
const unsigned scs_mask = (1U << component);
int done_mask = ~dst.writemask;
st_src_reg tmp;
assert(op == TGSI_OPCODE_SIN || op == TGSI_OPCODE_COS);
/* If there are compnents in the destination that differ from the component
* that will be written by the SCS instrution, we'll need a temporary.
*/
if (scs_mask != unsigned(dst.writemask)) {
tmp = get_temp(glsl_type::vec4_type);
}
for (unsigned i = 0; i < 4; i++) {
unsigned this_mask = (1U << i);
st_src_reg src0 = src;
if ((done_mask & this_mask) != 0)
continue;
/* The source swizzle specified which component of the source generates
* sine / cosine for the current component in the destination. The SCS
* instruction requires that this value be swizzle to the X component.
* Replace the current swizzle with a swizzle that puts the source in
* the X component.
*/
unsigned src0_swiz = GET_SWZ(src.swizzle, i);
src0.swizzle = MAKE_SWIZZLE4(src0_swiz, src0_swiz,
src0_swiz, src0_swiz);
for (unsigned j = i + 1; j < 4; j++) {
/* If there is another enabled component in the destination that is
* derived from the same inputs, generate its value on this pass as
* well.
*/
if (!(done_mask & (1 << j)) &&
GET_SWZ(src0.swizzle, j) == src0_swiz) {
this_mask |= (1 << j);
}
}
if (this_mask != scs_mask) {
glsl_to_tgsi_instruction *inst;
st_dst_reg tmp_dst = st_dst_reg(tmp);
/* Emit the SCS instruction.
*/
inst = emit(ir, TGSI_OPCODE_SCS, tmp_dst, src0);
inst->dst.writemask = scs_mask;
/* Move the result of the SCS instruction to the desired location in
* the destination.
*/
tmp.swizzle = MAKE_SWIZZLE4(component, component,
component, component);
inst = emit(ir, TGSI_OPCODE_SCS, dst, tmp);
inst->dst.writemask = this_mask;
} else {
/* Emit the SCS instruction to write directly to the destination.
*/
glsl_to_tgsi_instruction *inst = emit(ir, TGSI_OPCODE_SCS, dst, src0);
inst->dst.writemask = scs_mask;
}
done_mask |= this_mask;
}
}
int
glsl_to_tgsi_visitor::add_constant(gl_register_file file,
gl_constant_value values[4], int size, int datatype,
GLuint *swizzle_out)
{
if (file == PROGRAM_CONSTANT) {
return _mesa_add_typed_unnamed_constant(this->prog->Parameters, values,
size, datatype, swizzle_out);
} else {
int index = 0;
immediate_storage *entry;
assert(file == PROGRAM_IMMEDIATE);
/* Search immediate storage to see if we already have an identical
* immediate that we can use instead of adding a duplicate entry.
*/
foreach_iter(exec_list_iterator, iter, this->immediates) {
entry = (immediate_storage *)iter.get();
if (entry->size == size &&
entry->type == datatype &&
!memcmp(entry->values, values, size * sizeof(gl_constant_value))) {
return index;
}
index++;
}
/* Add this immediate to the list. */
entry = new(mem_ctx) immediate_storage(values, size, datatype);
this->immediates.push_tail(entry);
this->num_immediates++;
return index;
}
}
st_src_reg
glsl_to_tgsi_visitor::st_src_reg_for_float(float val)
{
st_src_reg src(PROGRAM_IMMEDIATE, -1, GLSL_TYPE_FLOAT);
union gl_constant_value uval;
uval.f = val;
src.index = add_constant(src.file, &uval, 1, GL_FLOAT, &src.swizzle);
return src;
}
st_src_reg
glsl_to_tgsi_visitor::st_src_reg_for_int(int val)
{
st_src_reg src(PROGRAM_IMMEDIATE, -1, GLSL_TYPE_INT);
union gl_constant_value uval;
assert(native_integers);
uval.i = val;
src.index = add_constant(src.file, &uval, 1, GL_INT, &src.swizzle);
return src;
}
st_src_reg
glsl_to_tgsi_visitor::st_src_reg_for_type(int type, int val)
{
if (native_integers)
return type == GLSL_TYPE_FLOAT ? st_src_reg_for_float(val) :
st_src_reg_for_int(val);
else
return st_src_reg_for_float(val);
}
static int
type_size(const struct glsl_type *type)
{
unsigned int i;
int size;
switch (type->base_type) {
case GLSL_TYPE_UINT:
case GLSL_TYPE_INT:
case GLSL_TYPE_FLOAT:
case GLSL_TYPE_BOOL:
if (type->is_matrix()) {
return type->matrix_columns;
} else {
/* Regardless of size of vector, it gets a vec4. This is bad
* packing for things like floats, but otherwise arrays become a
* mess. Hopefully a later pass over the code can pack scalars
* down if appropriate.
*/
return 1;
}
case GLSL_TYPE_ARRAY:
assert(type->length > 0);
return type_size(type->fields.array) * type->length;
case GLSL_TYPE_STRUCT:
size = 0;
for (i = 0; i < type->length; i++) {
size += type_size(type->fields.structure[i].type);
}
return size;
case GLSL_TYPE_SAMPLER:
/* Samplers take up one slot in UNIFORMS[], but they're baked in
* at link time.
*/
return 1;
default:
assert(0);
return 0;
}
}
/**
* In the initial pass of codegen, we assign temporary numbers to
* intermediate results. (not SSA -- variable assignments will reuse
* storage).
*/
st_src_reg
glsl_to_tgsi_visitor::get_temp(const glsl_type *type)
{
st_src_reg src;
src.type = native_integers ? type->base_type : GLSL_TYPE_FLOAT;
src.file = PROGRAM_TEMPORARY;
src.index = next_temp;
src.reladdr = NULL;
next_temp += type_size(type);
if (type->is_array() || type->is_record()) {
src.swizzle = SWIZZLE_NOOP;
} else {
src.swizzle = swizzle_for_size(type->vector_elements);
}
src.negate = 0;
return src;
}
variable_storage *
glsl_to_tgsi_visitor::find_variable_storage(ir_variable *var)
{
variable_storage *entry;
foreach_iter(exec_list_iterator, iter, this->variables) {
entry = (variable_storage *)iter.get();
if (entry->var == var)
return entry;
}
return NULL;
}
void
glsl_to_tgsi_visitor::visit(ir_variable *ir)
{
if (strcmp(ir->name, "gl_FragCoord") == 0) {
struct gl_fragment_program *fp = (struct gl_fragment_program *)this->prog;
fp->OriginUpperLeft = ir->origin_upper_left;
fp->PixelCenterInteger = ir->pixel_center_integer;
}
if (ir->mode == ir_var_uniform && strncmp(ir->name, "gl_", 3) == 0) {
unsigned int i;
const ir_state_slot *const slots = ir->state_slots;
assert(ir->state_slots != NULL);
/* Check if this statevar's setup in the STATE file exactly
* matches how we'll want to reference it as a
* struct/array/whatever. If not, then we need to move it into
* temporary storage and hope that it'll get copy-propagated
* out.
*/
for (i = 0; i < ir->num_state_slots; i++) {
if (slots[i].swizzle != SWIZZLE_XYZW) {
break;
}
}
variable_storage *storage;
st_dst_reg dst;
if (i == ir->num_state_slots) {
/* We'll set the index later. */
storage = new(mem_ctx) variable_storage(ir, PROGRAM_STATE_VAR, -1);
this->variables.push_tail(storage);
dst = undef_dst;
} else {
/* The variable_storage constructor allocates slots based on the size
* of the type. However, this had better match the number of state
* elements that we're going to copy into the new temporary.
*/
assert((int) ir->num_state_slots == type_size(ir->type));
storage = new(mem_ctx) variable_storage(ir, PROGRAM_TEMPORARY,
this->next_temp);
this->variables.push_tail(storage);
this->next_temp += type_size(ir->type);
dst = st_dst_reg(st_src_reg(PROGRAM_TEMPORARY, storage->index,
native_integers ? ir->type->base_type : GLSL_TYPE_FLOAT));
}
for (unsigned int i = 0; i < ir->num_state_slots; i++) {
int index = _mesa_add_state_reference(this->prog->Parameters,
(gl_state_index *)slots[i].tokens);
if (storage->file == PROGRAM_STATE_VAR) {
if (storage->index == -1) {
storage->index = index;
} else {
assert(index == storage->index + (int)i);
}
} else {
/* We use GLSL_TYPE_FLOAT here regardless of the actual type of
* the data being moved since MOV does not care about the type of
* data it is moving, and we don't want to declare registers with
* array or struct types.
*/
st_src_reg src(PROGRAM_STATE_VAR, index, GLSL_TYPE_FLOAT);
src.swizzle = slots[i].swizzle;
emit(ir, TGSI_OPCODE_MOV, dst, src);
/* even a float takes up a whole vec4 reg in a struct/array. */
dst.index++;
}
}
if (storage->file == PROGRAM_TEMPORARY &&
dst.index != storage->index + (int) ir->num_state_slots) {
fail_link(this->shader_program,
"failed to load builtin uniform `%s' (%d/%d regs loaded)\n",
ir->name, dst.index - storage->index,
type_size(ir->type));
}
}
}
void
glsl_to_tgsi_visitor::visit(ir_loop *ir)
{
ir_dereference_variable *counter = NULL;
if (ir->counter != NULL)
counter = new(ir) ir_dereference_variable(ir->counter);
if (ir->from != NULL) {
assert(ir->counter != NULL);
ir_assignment *a = new(ir) ir_assignment(counter, ir->from, NULL);
a->accept(this);
delete a;
}
emit(NULL, TGSI_OPCODE_BGNLOOP);
if (ir->to) {
ir_expression *e =
new(ir) ir_expression(ir->cmp, glsl_type::bool_type,
counter, ir->to);
ir_if *if_stmt = new(ir) ir_if(e);
ir_loop_jump *brk = new(ir) ir_loop_jump(ir_loop_jump::jump_break);
if_stmt->then_instructions.push_tail(brk);
if_stmt->accept(this);
delete if_stmt;
delete e;
delete brk;
}
visit_exec_list(&ir->body_instructions, this);
if (ir->increment) {
ir_expression *e =
new(ir) ir_expression(ir_binop_add, counter->type,
counter, ir->increment);
ir_assignment *a = new(ir) ir_assignment(counter, e, NULL);
a->accept(this);
delete a;
delete e;
}
emit(NULL, TGSI_OPCODE_ENDLOOP);
}
void
glsl_to_tgsi_visitor::visit(ir_loop_jump *ir)
{
switch (ir->mode) {
case ir_loop_jump::jump_break:
emit(NULL, TGSI_OPCODE_BRK);
break;
case ir_loop_jump::jump_continue:
emit(NULL, TGSI_OPCODE_CONT);
break;
}
}
void
glsl_to_tgsi_visitor::visit(ir_function_signature *ir)
{
assert(0);
(void)ir;
}
void
glsl_to_tgsi_visitor::visit(ir_function *ir)
{
/* Ignore function bodies other than main() -- we shouldn't see calls to
* them since they should all be inlined before we get to glsl_to_tgsi.
*/
if (strcmp(ir->name, "main") == 0) {
const ir_function_signature *sig;
exec_list empty;
sig = ir->matching_signature(&empty);
assert(sig);
foreach_iter(exec_list_iterator, iter, sig->body) {
ir_instruction *ir = (ir_instruction *)iter.get();
ir->accept(this);
}
}
}
bool
glsl_to_tgsi_visitor::try_emit_mad(ir_expression *ir, int mul_operand)
{
int nonmul_operand = 1 - mul_operand;
st_src_reg a, b, c;
st_dst_reg result_dst;
ir_expression *expr = ir->operands[mul_operand]->as_expression();
if (!expr || expr->operation != ir_binop_mul)
return false;
expr->operands[0]->accept(this);
a = this->result;
expr->operands[1]->accept(this);
b = this->result;
ir->operands[nonmul_operand]->accept(this);
c = this->result;
this->result = get_temp(ir->type);
result_dst = st_dst_reg(this->result);
result_dst.writemask = (1 << ir->type->vector_elements) - 1;
emit(ir, TGSI_OPCODE_MAD, result_dst, a, b, c);
return true;
}
/**
* Emit MAD(a, -b, a) instead of AND(a, NOT(b))
*
* The logic values are 1.0 for true and 0.0 for false. Logical-and is
* implemented using multiplication, and logical-or is implemented using
* addition. Logical-not can be implemented as (true - x), or (1.0 - x).
* As result, the logical expression (a & !b) can be rewritten as:
*
* - a * !b
* - a * (1 - b)
* - (a * 1) - (a * b)
* - a + -(a * b)
* - a + (a * -b)
*
* This final expression can be implemented as a single MAD(a, -b, a)
* instruction.
*/
bool
glsl_to_tgsi_visitor::try_emit_mad_for_and_not(ir_expression *ir, int try_operand)
{
const int other_operand = 1 - try_operand;
st_src_reg a, b;
ir_expression *expr = ir->operands[try_operand]->as_expression();
if (!expr || expr->operation != ir_unop_logic_not)
return false;
ir->operands[other_operand]->accept(this);
a = this->result;
expr->operands[0]->accept(this);
b = this->result;
b.negate = ~b.negate;
this->result = get_temp(ir->type);
emit(ir, TGSI_OPCODE_MAD, st_dst_reg(this->result), a, b, a);
return true;
}
bool
glsl_to_tgsi_visitor::try_emit_sat(ir_expression *ir)
{
/* Saturates were only introduced to vertex programs in
* NV_vertex_program3, so don't give them to drivers in the VP.
*/
if (this->prog->Target == GL_VERTEX_PROGRAM_ARB)
return false;
ir_rvalue *sat_src = ir->as_rvalue_to_saturate();
if (!sat_src)
return false;
sat_src->accept(this);
st_src_reg src = this->result;
/* If we generated an expression instruction into a temporary in
* processing the saturate's operand, apply the saturate to that
* instruction. Otherwise, generate a MOV to do the saturate.
*
* Note that we have to be careful to only do this optimization if
* the instruction in question was what generated src->result. For
* example, ir_dereference_array might generate a MUL instruction
* to create the reladdr, and return us a src reg using that
* reladdr. That MUL result is not the value we're trying to
* saturate.
*/
ir_expression *sat_src_expr = sat_src->as_expression();
if (sat_src_expr && (sat_src_expr->operation == ir_binop_mul ||
sat_src_expr->operation == ir_binop_add ||
sat_src_expr->operation == ir_binop_dot)) {
glsl_to_tgsi_instruction *new_inst;
new_inst = (glsl_to_tgsi_instruction *)this->instructions.get_tail();
new_inst->saturate = true;
} else {
this->result = get_temp(ir->type);
st_dst_reg result_dst = st_dst_reg(this->result);
result_dst.writemask = (1 << ir->type->vector_elements) - 1;
glsl_to_tgsi_instruction *inst;
inst = emit(ir, TGSI_OPCODE_MOV, result_dst, src);
inst->saturate = true;
}
return true;
}
void
glsl_to_tgsi_visitor::reladdr_to_temp(ir_instruction *ir,
st_src_reg *reg, int *num_reladdr)
{
if (!reg->reladdr)
return;
emit_arl(ir, address_reg, *reg->reladdr);
if (*num_reladdr != 1) {
st_src_reg temp = get_temp(glsl_type::vec4_type);
emit(ir, TGSI_OPCODE_MOV, st_dst_reg(temp), *reg);
*reg = temp;
}
(*num_reladdr)--;
}
void
glsl_to_tgsi_visitor::visit(ir_expression *ir)
{
unsigned int operand;
st_src_reg op[Elements(ir->operands)];
st_src_reg result_src;
st_dst_reg result_dst;
/* Quick peephole: Emit MAD(a, b, c) instead of ADD(MUL(a, b), c)
*/
if (ir->operation == ir_binop_add) {
if (try_emit_mad(ir, 1))
return;
if (try_emit_mad(ir, 0))
return;
}
/* Quick peephole: Emit OPCODE_MAD(-a, -b, a) instead of AND(a, NOT(b))
*/
if (ir->operation == ir_binop_logic_and) {
if (try_emit_mad_for_and_not(ir, 1))
return;
if (try_emit_mad_for_and_not(ir, 0))
return;
}
if (try_emit_sat(ir))
return;
if (ir->operation == ir_quadop_vector)
assert(!"ir_quadop_vector should have been lowered");
for (operand = 0; operand < ir->get_num_operands(); operand++) {
this->result.file = PROGRAM_UNDEFINED;
ir->operands[operand]->accept(this);
if (this->result.file == PROGRAM_UNDEFINED) {
ir_print_visitor v;
printf("Failed to get tree for expression operand:\n");
ir->operands[operand]->accept(&v);
exit(1);
}
op[operand] = this->result;
/* Matrix expression operands should have been broken down to vector
* operations already.
*/
assert(!ir->operands[operand]->type->is_matrix());
}
int vector_elements = ir->operands[0]->type->vector_elements;
if (ir->operands[1]) {
vector_elements = MAX2(vector_elements,
ir->operands[1]->type->vector_elements);
}
this->result.file = PROGRAM_UNDEFINED;
/* Storage for our result. Ideally for an assignment we'd be using
* the actual storage for the result here, instead.
*/
result_src = get_temp(ir->type);
/* convenience for the emit functions below. */
result_dst = st_dst_reg(result_src);
/* Limit writes to the channels that will be used by result_src later.
* This does limit this temp's use as a temporary for multi-instruction
* sequences.
*/
result_dst.writemask = (1 << ir->type->vector_elements) - 1;
switch (ir->operation) {
case ir_unop_logic_not:
if (result_dst.type != GLSL_TYPE_FLOAT)
emit(ir, TGSI_OPCODE_NOT, result_dst, op[0]);
else {
/* Previously 'SEQ dst, src, 0.0' was used for this. However, many
* older GPUs implement SEQ using multiple instructions (i915 uses two
* SGE instructions and a MUL instruction). Since our logic values are
* 0.0 and 1.0, 1-x also implements !x.
*/
op[0].negate = ~op[0].negate;
emit(ir, TGSI_OPCODE_ADD, result_dst, op[0], st_src_reg_for_float(1.0));
}
break;
case ir_unop_neg:
if (result_dst.type == GLSL_TYPE_INT || result_dst.type == GLSL_TYPE_UINT)
emit(ir, TGSI_OPCODE_INEG, result_dst, op[0]);
else {
op[0].negate = ~op[0].negate;
result_src = op[0];
}
break;
case ir_unop_abs:
emit(ir, TGSI_OPCODE_ABS, result_dst, op[0]);
break;
case ir_unop_sign:
emit(ir, TGSI_OPCODE_SSG, result_dst, op[0]);
break;
case ir_unop_rcp:
emit_scalar(ir, TGSI_OPCODE_RCP, result_dst, op[0]);
break;
case ir_unop_exp2:
emit_scalar(ir, TGSI_OPCODE_EX2, result_dst, op[0]);
break;
case ir_unop_exp:
case ir_unop_log:
assert(!"not reached: should be handled by ir_explog_to_explog2");
break;
case ir_unop_log2:
emit_scalar(ir, TGSI_OPCODE_LG2, result_dst, op[0]);
break;
case ir_unop_sin:
emit_scalar(ir, TGSI_OPCODE_SIN, result_dst, op[0]);
break;
case ir_unop_cos:
emit_scalar(ir, TGSI_OPCODE_COS, result_dst, op[0]);
break;
case ir_unop_sin_reduced:
emit_scs(ir, TGSI_OPCODE_SIN, result_dst, op[0]);
break;
case ir_unop_cos_reduced:
emit_scs(ir, TGSI_OPCODE_COS, result_dst, op[0]);
break;
case ir_unop_dFdx:
emit(ir, TGSI_OPCODE_DDX, result_dst, op[0]);
break;
case ir_unop_dFdy:
{
/* The X component contains 1 or -1 depending on whether the framebuffer
* is a FBO or the window system buffer, respectively.
* It is then multiplied with the source operand of DDY.
*/
static const gl_state_index transform_y_state[STATE_LENGTH]
= { STATE_INTERNAL, STATE_FB_WPOS_Y_TRANSFORM };
unsigned transform_y_index =
_mesa_add_state_reference(this->prog->Parameters,
transform_y_state);
st_src_reg transform_y = st_src_reg(PROGRAM_STATE_VAR,
transform_y_index,
glsl_type::vec4_type);
transform_y.swizzle = SWIZZLE_XXXX;
st_src_reg temp = get_temp(glsl_type::vec4_type);
emit(ir, TGSI_OPCODE_MUL, st_dst_reg(temp), transform_y, op[0]);
emit(ir, TGSI_OPCODE_DDY, result_dst, temp);
break;
}
case ir_unop_noise: {
/* At some point, a motivated person could add a better
* implementation of noise. Currently not even the nvidia
* binary drivers do anything more than this. In any case, the
* place to do this is in the GL state tracker, not the poor
* driver.
*/
emit(ir, TGSI_OPCODE_MOV, result_dst, st_src_reg_for_float(0.5));
break;
}
case ir_binop_add:
emit(ir, TGSI_OPCODE_ADD, result_dst, op[0], op[1]);
break;
case ir_binop_sub:
emit(ir, TGSI_OPCODE_SUB, result_dst, op[0], op[1]);
break;
case ir_binop_mul:
emit(ir, TGSI_OPCODE_MUL, result_dst, op[0], op[1]);
break;
case ir_binop_div:
if (result_dst.type == GLSL_TYPE_FLOAT)
assert(!"not reached: should be handled by ir_div_to_mul_rcp");
else
emit(ir, TGSI_OPCODE_DIV, result_dst, op[0], op[1]);
break;
case ir_binop_mod:
if (result_dst.type == GLSL_TYPE_FLOAT)
assert(!"ir_binop_mod should have been converted to b * fract(a/b)");
else
emit(ir, TGSI_OPCODE_MOD, result_dst, op[0], op[1]);
break;
case ir_binop_less:
emit(ir, TGSI_OPCODE_SLT, result_dst, op[0], op[1]);
break;
case ir_binop_greater:
emit(ir, TGSI_OPCODE_SLT, result_dst, op[1], op[0]);
break;
case ir_binop_lequal:
emit(ir, TGSI_OPCODE_SGE, result_dst, op[1], op[0]);
break;
case ir_binop_gequal:
emit(ir, TGSI_OPCODE_SGE, result_dst, op[0], op[1]);
break;
case ir_binop_equal:
emit(ir, TGSI_OPCODE_SEQ, result_dst, op[0], op[1]);
break;
case ir_binop_nequal:
emit(ir, TGSI_OPCODE_SNE, result_dst, op[0], op[1]);
break;
case ir_binop_all_equal:
/* "==" operator producing a scalar boolean. */
if (ir->operands[0]->type->is_vector() ||
ir->operands[1]->type->is_vector()) {
st_src_reg temp = get_temp(native_integers ?
glsl_type::get_instance(ir->operands[0]->type->base_type, 4, 1) :
glsl_type::vec4_type);
if (native_integers) {
st_dst_reg temp_dst = st_dst_reg(temp);
st_src_reg temp1 = st_src_reg(temp), temp2 = st_src_reg(temp);
emit(ir, TGSI_OPCODE_SEQ, st_dst_reg(temp), op[0], op[1]);
/* Emit 1-3 AND operations to combine the SEQ results. */
switch (ir->operands[0]->type->vector_elements) {
case 2:
break;
case 3:
temp_dst.writemask = WRITEMASK_Y;
temp1.swizzle = SWIZZLE_YYYY;
temp2.swizzle = SWIZZLE_ZZZZ;
emit(ir, TGSI_OPCODE_AND, temp_dst, temp1, temp2);
break;
case 4:
temp_dst.writemask = WRITEMASK_X;
temp1.swizzle = SWIZZLE_XXXX;
temp2.swizzle = SWIZZLE_YYYY;
emit(ir, TGSI_OPCODE_AND, temp_dst, temp1, temp2);
temp_dst.writemask = WRITEMASK_Y;
temp1.swizzle = SWIZZLE_ZZZZ;
temp2.swizzle = SWIZZLE_WWWW;
emit(ir, TGSI_OPCODE_AND, temp_dst, temp1, temp2);
}
temp1.swizzle = SWIZZLE_XXXX;
temp2.swizzle = SWIZZLE_YYYY;
emit(ir, TGSI_OPCODE_AND, result_dst, temp1, temp2);
} else {
emit(ir, TGSI_OPCODE_SNE, st_dst_reg(temp), op[0], op[1]);
/* After the dot-product, the value will be an integer on the
* range [0,4]. Zero becomes 1.0, and positive values become zero.
*/
emit_dp(ir, result_dst, temp, temp, vector_elements);
/* Negating the result of the dot-product gives values on the range
* [-4, 0]. Zero becomes 1.0, and negative values become zero.
* This is achieved using SGE.
*/
st_src_reg sge_src = result_src;
sge_src.negate = ~sge_src.negate;
emit(ir, TGSI_OPCODE_SGE, result_dst, sge_src, st_src_reg_for_float(0.0));
}
} else {
emit(ir, TGSI_OPCODE_SEQ, result_dst, op[0], op[1]);
}
break;
case ir_binop_any_nequal:
/* "!=" operator producing a scalar boolean. */
if (ir->operands[0]->type->is_vector() ||
ir->operands[1]->type->is_vector()) {
st_src_reg temp = get_temp(native_integers ?
glsl_type::get_instance(ir->operands[0]->type->base_type, 4, 1) :
glsl_type::vec4_type);
emit(ir, TGSI_OPCODE_SNE, st_dst_reg(temp), op[0], op[1]);
if (native_integers) {
st_dst_reg temp_dst = st_dst_reg(temp);
st_src_reg temp1 = st_src_reg(temp), temp2 = st_src_reg(temp);
/* Emit 1-3 OR operations to combine the SNE results. */
switch (ir->operands[0]->type->vector_elements) {
case 2:
break;
case 3:
temp_dst.writemask = WRITEMASK_Y;
temp1.swizzle = SWIZZLE_YYYY;
temp2.swizzle = SWIZZLE_ZZZZ;
emit(ir, TGSI_OPCODE_OR, temp_dst, temp1, temp2);
break;
case 4:
temp_dst.writemask = WRITEMASK_X;
temp1.swizzle = SWIZZLE_XXXX;
temp2.swizzle = SWIZZLE_YYYY;
emit(ir, TGSI_OPCODE_OR, temp_dst, temp1, temp2);
temp_dst.writemask = WRITEMASK_Y;
temp1.swizzle = SWIZZLE_ZZZZ;
temp2.swizzle = SWIZZLE_WWWW;
emit(ir, TGSI_OPCODE_OR, temp_dst, temp1, temp2);
}
temp1.swizzle = SWIZZLE_XXXX;
temp2.swizzle = SWIZZLE_YYYY;
emit(ir, TGSI_OPCODE_OR, result_dst, temp1, temp2);
} else {
/* After the dot-product, the value will be an integer on the
* range [0,4]. Zero stays zero, and positive values become 1.0.
*/
glsl_to_tgsi_instruction *const dp =
emit_dp(ir, result_dst, temp, temp, vector_elements);
if (this->prog->Target == GL_FRAGMENT_PROGRAM_ARB) {
/* The clamping to [0,1] can be done for free in the fragment
* shader with a saturate.
*/
dp->saturate = true;
} else {
/* Negating the result of the dot-product gives values on the range
* [-4, 0]. Zero stays zero, and negative values become 1.0. This
* achieved using SLT.
*/
st_src_reg slt_src = result_src;
slt_src.negate = ~slt_src.negate;
emit(ir, TGSI_OPCODE_SLT, result_dst, slt_src, st_src_reg_for_float(0.0));
}
}
} else {
emit(ir, TGSI_OPCODE_SNE, result_dst, op[0], op[1]);
}
break;
case ir_unop_any: {
assert(ir->operands[0]->type->is_vector());
/* After the dot-product, the value will be an integer on the
* range [0,4]. Zero stays zero, and positive values become 1.0.
*/
glsl_to_tgsi_instruction *const dp =
emit_dp(ir, result_dst, op[0], op[0],
ir->operands[0]->type->vector_elements);
if (this->prog->Target == GL_FRAGMENT_PROGRAM_ARB &&
result_dst.type == GLSL_TYPE_FLOAT) {
/* The clamping to [0,1] can be done for free in the fragment
* shader with a saturate.
*/
dp->saturate = true;
} else if (result_dst.type == GLSL_TYPE_FLOAT) {
/* Negating the result of the dot-product gives values on the range
* [-4, 0]. Zero stays zero, and negative values become 1.0. This
* is achieved using SLT.
*/
st_src_reg slt_src = result_src;
slt_src.negate = ~slt_src.negate;
emit(ir, TGSI_OPCODE_SLT, result_dst, slt_src, st_src_reg_for_float(0.0));
}
else {
/* Use SNE 0 if integers are being used as boolean values. */
emit(ir, TGSI_OPCODE_SNE, result_dst, result_src, st_src_reg_for_int(0));
}
break;
}
case ir_binop_logic_xor:
if (native_integers)
emit(ir, TGSI_OPCODE_XOR, result_dst, op[0], op[1]);
else
emit(ir, TGSI_OPCODE_SNE, result_dst, op[0], op[1]);
break;
case ir_binop_logic_or: {
if (native_integers) {
/* If integers are used as booleans, we can use an actual "or"
* instruction.
*/
assert(native_integers);
emit(ir, TGSI_OPCODE_OR, result_dst, op[0], op[1]);
} else {
/* After the addition, the value will be an integer on the
* range [0,2]. Zero stays zero, and positive values become 1.0.
*/
glsl_to_tgsi_instruction *add =
emit(ir, TGSI_OPCODE_ADD, result_dst, op[0], op[1]);
if (this->prog->Target == GL_FRAGMENT_PROGRAM_ARB) {
/* The clamping to [0,1] can be done for free in the fragment
* shader with a saturate if floats are being used as boolean values.
*/
add->saturate = true;
} else {
/* Negating the result of the addition gives values on the range
* [-2, 0]. Zero stays zero, and negative values become 1.0. This
* is achieved using SLT.
*/
st_src_reg slt_src = result_src;
slt_src.negate = ~slt_src.negate;
emit(ir, TGSI_OPCODE_SLT, result_dst, slt_src, st_src_reg_for_float(0.0));
}
}
break;
}
case ir_binop_logic_and:
/* If native integers are disabled, the bool args are stored as float 0.0
* or 1.0, so "mul" gives us "and". If they're enabled, just use the
* actual AND opcode.
*/
if (native_integers)
emit(ir, TGSI_OPCODE_AND, result_dst, op[0], op[1]);
else
emit(ir, TGSI_OPCODE_MUL, result_dst, op[0], op[1]);
break;
case ir_binop_dot:
assert(ir->operands[0]->type->is_vector());
assert(ir->operands[0]->type == ir->operands[1]->type);
emit_dp(ir, result_dst, op[0], op[1],
ir->operands[0]->type->vector_elements);
break;
case ir_unop_sqrt:
/* sqrt(x) = x * rsq(x). */
emit_scalar(ir, TGSI_OPCODE_RSQ, result_dst, op[0]);
emit(ir, TGSI_OPCODE_MUL, result_dst, result_src, op[0]);
/* For incoming channels <= 0, set the result to 0. */
op[0].negate = ~op[0].negate;
emit(ir, TGSI_OPCODE_CMP, result_dst,
op[0], result_src, st_src_reg_for_float(0.0));
break;
case ir_unop_rsq:
emit_scalar(ir, TGSI_OPCODE_RSQ, result_dst, op[0]);
break;
case ir_unop_i2f:
if (native_integers) {
emit(ir, TGSI_OPCODE_I2F, result_dst, op[0]);
break;
}
/* fallthrough to next case otherwise */
case ir_unop_b2f:
if (native_integers) {
emit(ir, TGSI_OPCODE_AND, result_dst, op[0], st_src_reg_for_float(1.0));
break;
}
/* fallthrough to next case otherwise */
case ir_unop_i2u:
case ir_unop_u2i:
/* Converting between signed and unsigned integers is a no-op. */
result_src = op[0];
break;
case ir_unop_b2i:
if (native_integers) {
/* Booleans are stored as integers using ~0 for true and 0 for false.
* GLSL requires that int(bool) return 1 for true and 0 for false.
* This conversion is done with AND, but it could be done with NEG.
*/
emit(ir, TGSI_OPCODE_AND, result_dst, op[0], st_src_reg_for_int(1));
} else {
/* Booleans and integers are both stored as floats when native
* integers are disabled.
*/
result_src = op[0];
}
break;
case ir_unop_f2i:
if (native_integers)
emit(ir, TGSI_OPCODE_F2I, result_dst, op[0]);
else
emit(ir, TGSI_OPCODE_TRUNC, result_dst, op[0]);
break;
case ir_unop_f2u:
if (native_integers)
emit(ir, TGSI_OPCODE_F2U, result_dst, op[0]);
else
emit(ir, TGSI_OPCODE_TRUNC, result_dst, op[0]);
break;
case ir_unop_bitcast_f2i:
case ir_unop_bitcast_f2u:
case ir_unop_bitcast_i2f:
case ir_unop_bitcast_u2f:
result_src = op[0];
break;
case ir_unop_f2b:
emit(ir, TGSI_OPCODE_SNE, result_dst, op[0], st_src_reg_for_float(0.0));
break;
case ir_unop_i2b:
if (native_integers)
emit(ir, TGSI_OPCODE_INEG, result_dst, op[0]);
else
emit(ir, TGSI_OPCODE_SNE, result_dst, op[0], st_src_reg_for_float(0.0));
break;
case ir_unop_trunc:
emit(ir, TGSI_OPCODE_TRUNC, result_dst, op[0]);
break;
case ir_unop_ceil:
emit(ir, TGSI_OPCODE_CEIL, result_dst, op[0]);
break;
case ir_unop_floor:
emit(ir, TGSI_OPCODE_FLR, result_dst, op[0]);
break;
case ir_unop_round_even:
emit(ir, TGSI_OPCODE_ROUND, result_dst, op[0]);
break;
case ir_unop_fract:
emit(ir, TGSI_OPCODE_FRC, result_dst, op[0]);
break;
case ir_binop_min:
emit(ir, TGSI_OPCODE_MIN, result_dst, op[0], op[1]);
break;
case ir_binop_max:
emit(ir, TGSI_OPCODE_MAX, result_dst, op[0], op[1]);
break;
case ir_binop_pow:
emit_scalar(ir, TGSI_OPCODE_POW, result_dst, op[0], op[1]);
break;
case ir_unop_bit_not:
if (native_integers) {
emit(ir, TGSI_OPCODE_NOT, result_dst, op[0]);
break;
}
case ir_unop_u2f:
if (native_integers) {
emit(ir, TGSI_OPCODE_U2F, result_dst, op[0]);
break;
}
case ir_binop_lshift:
if (native_integers) {
emit(ir, TGSI_OPCODE_SHL, result_dst, op[0], op[1]);
break;
}
case ir_binop_rshift:
if (native_integers) {
emit(ir, TGSI_OPCODE_ISHR, result_dst, op[0], op[1]);
break;
}
case ir_binop_bit_and:
if (native_integers) {
emit(ir, TGSI_OPCODE_AND, result_dst, op[0], op[1]);
break;
}
case ir_binop_bit_xor:
if (native_integers) {
emit(ir, TGSI_OPCODE_XOR, result_dst, op[0], op[1]);
break;
}
case ir_binop_bit_or:
if (native_integers) {
emit(ir, TGSI_OPCODE_OR, result_dst, op[0], op[1]);
break;
}
assert(!"GLSL 1.30 features unsupported");
break;
case ir_binop_ubo_load:
assert(!"not yet supported");
break;
case ir_quadop_vector:
/* This operation should have already been handled.
*/
assert(!"Should not get here.");
break;
}
this->result = result_src;
}
void
glsl_to_tgsi_visitor::visit(ir_swizzle *ir)
{
st_src_reg src;
int i;
int swizzle[4];
/* Note that this is only swizzles in expressions, not those on the left
* hand side of an assignment, which do write masking. See ir_assignment
* for that.
*/
ir->val->accept(this);
src = this->result;
assert(src.file != PROGRAM_UNDEFINED);
for (i = 0; i < 4; i++) {
if (i < ir->type->vector_elements) {
switch (i) {
case 0:
swizzle[i] = GET_SWZ(src.swizzle, ir->mask.x);
break;
case 1:
swizzle[i] = GET_SWZ(src.swizzle, ir->mask.y);
break;
case 2:
swizzle[i] = GET_SWZ(src.swizzle, ir->mask.z);
break;
case 3:
swizzle[i] = GET_SWZ(src.swizzle, ir->mask.w);
break;
}
} else {
/* If the type is smaller than a vec4, replicate the last
* channel out.
*/
swizzle[i] = swizzle[ir->type->vector_elements - 1];
}
}
src.swizzle = MAKE_SWIZZLE4(swizzle[0], swizzle[1], swizzle[2], swizzle[3]);
this->result = src;
}
void
glsl_to_tgsi_visitor::visit(ir_dereference_variable *ir)
{
variable_storage *entry = find_variable_storage(ir->var);
ir_variable *var = ir->var;
if (!entry) {
switch (var->mode) {
case ir_var_uniform:
entry = new(mem_ctx) variable_storage(var, PROGRAM_UNIFORM,
var->location);
this->variables.push_tail(entry);
break;
case ir_var_in:
case ir_var_inout:
/* The linker assigns locations for varyings and attributes,
* including deprecated builtins (like gl_Color), user-assign
* generic attributes (glBindVertexLocation), and
* user-defined varyings.
*
* FINISHME: We would hit this path for function arguments. Fix!
*/
assert(var->location != -1);
entry = new(mem_ctx) variable_storage(var,
PROGRAM_INPUT,
var->location);
break;
case ir_var_out:
assert(var->location != -1);
entry = new(mem_ctx) variable_storage(var,
PROGRAM_OUTPUT,
var->location + var->index);
break;
case ir_var_system_value:
entry = new(mem_ctx) variable_storage(var,
PROGRAM_SYSTEM_VALUE,
var->location);
break;
case ir_var_auto:
case ir_var_temporary:
entry = new(mem_ctx) variable_storage(var, PROGRAM_TEMPORARY,
this->next_temp);
this->variables.push_tail(entry);
next_temp += type_size(var->type);
break;
}
if (!entry) {
printf("Failed to make storage for %s\n", var->name);
exit(1);
}
}
this->result = st_src_reg(entry->file, entry->index, var->type);
if (!native_integers)
this->result.type = GLSL_TYPE_FLOAT;
}
void
glsl_to_tgsi_visitor::visit(ir_dereference_array *ir)
{
ir_constant *index;
st_src_reg src;
int element_size = type_size(ir->type);
index = ir->array_index->constant_expression_value();
ir->array->accept(this);
src = this->result;
if (index) {
src.index += index->value.i[0] * element_size;
} else {
/* Variable index array dereference. It eats the "vec4" of the
* base of the array and an index that offsets the TGSI register
* index.
*/
ir->array_index->accept(this);
st_src_reg index_reg;
if (element_size == 1) {
index_reg = this->result;
} else {
index_reg = get_temp(native_integers ?
glsl_type::int_type : glsl_type::float_type);
emit(ir, TGSI_OPCODE_MUL, st_dst_reg(index_reg),
this->result, st_src_reg_for_type(index_reg.type, element_size));
}
/* If there was already a relative address register involved, add the
* new and the old together to get the new offset.
*/
if (src.reladdr != NULL) {
st_src_reg accum_reg = get_temp(native_integers ?
glsl_type::int_type : glsl_type::float_type);
emit(ir, TGSI_OPCODE_ADD, st_dst_reg(accum_reg),
index_reg, *src.reladdr);
index_reg = accum_reg;
}
src.reladdr = ralloc(mem_ctx, st_src_reg);
memcpy(src.reladdr, &index_reg, sizeof(index_reg));
}
/* If the type is smaller than a vec4, replicate the last channel out. */
if (ir->type->is_scalar() || ir->type->is_vector())
src.swizzle = swizzle_for_size(ir->type->vector_elements);
else
src.swizzle = SWIZZLE_NOOP;
/* Change the register type to the element type of the array. */
src.type = ir->type->base_type;
this->result = src;
}
void
glsl_to_tgsi_visitor::visit(ir_dereference_record *ir)
{
unsigned int i;
const glsl_type *struct_type = ir->record->type;
int offset = 0;
ir->record->accept(this);
for (i = 0; i < struct_type->length; i++) {
if (strcmp(struct_type->fields.structure[i].name, ir->field) == 0)
break;
offset += type_size(struct_type->fields.structure[i].type);
}
/* If the type is smaller than a vec4, replicate the last channel out. */
if (ir->type->is_scalar() || ir->type->is_vector())
this->result.swizzle = swizzle_for_size(ir->type->vector_elements);
else
this->result.swizzle = SWIZZLE_NOOP;
this->result.index += offset;
this->result.type = ir->type->base_type;
}
/**
* We want to be careful in assignment setup to hit the actual storage
* instead of potentially using a temporary like we might with the
* ir_dereference handler.
*/
static st_dst_reg
get_assignment_lhs(ir_dereference *ir, glsl_to_tgsi_visitor *v)
{
/* The LHS must be a dereference. If the LHS is a variable indexed array
* access of a vector, it must be separated into a series conditional moves
* before reaching this point (see ir_vec_index_to_cond_assign).
*/
assert(ir->as_dereference());
ir_dereference_array *deref_array = ir->as_dereference_array();
if (deref_array) {
assert(!deref_array->array->type->is_vector());
}
/* Use the rvalue deref handler for the most part. We'll ignore
* swizzles in it and write swizzles using writemask, though.
*/
ir->accept(v);
return st_dst_reg(v->result);
}
/**
* Process the condition of a conditional assignment
*
* Examines the condition of a conditional assignment to generate the optimal
* first operand of a \c CMP instruction. If the condition is a relational
* operator with 0 (e.g., \c ir_binop_less), the value being compared will be
* used as the source for the \c CMP instruction. Otherwise the comparison
* is processed to a boolean result, and the boolean result is used as the
* operand to the CMP instruction.
*/
bool
glsl_to_tgsi_visitor::process_move_condition(ir_rvalue *ir)
{
ir_rvalue *src_ir = ir;
bool negate = true;
bool switch_order = false;
ir_expression *const expr = ir->as_expression();
if ((expr != NULL) && (expr->get_num_operands() == 2)) {
bool zero_on_left = false;
if (expr->operands[0]->is_zero()) {
src_ir = expr->operands[1];
zero_on_left = true;
} else if (expr->operands[1]->is_zero()) {
src_ir = expr->operands[0];
zero_on_left = false;
}
/* a is - 0 + - 0 +
* (a < 0) T F F ( a < 0) T F F
* (0 < a) F F T (-a < 0) F F T
* (a <= 0) T T F (-a < 0) F F T (swap order of other operands)
* (0 <= a) F T T ( a < 0) T F F (swap order of other operands)
* (a > 0) F F T (-a < 0) F F T
* (0 > a) T F F ( a < 0) T F F
* (a >= 0) F T T ( a < 0) T F F (swap order of other operands)
* (0 >= a) T T F (-a < 0) F F T (swap order of other operands)
*
* Note that exchanging the order of 0 and 'a' in the comparison simply
* means that the value of 'a' should be negated.
*/
if (src_ir != ir) {
switch (expr->operation) {
case ir_binop_less:
switch_order = false;
negate = zero_on_left;
break;
case ir_binop_greater:
switch_order = false;
negate = !zero_on_left;
break;
case ir_binop_lequal:
switch_order = true;
negate = !zero_on_left;
break;
case ir_binop_gequal:
switch_order = true;
negate = zero_on_left;
break;
default:
/* This isn't the right kind of comparison afterall, so make sure
* the whole condition is visited.
*/
src_ir = ir;
break;
}
}
}
src_ir->accept(this);
/* We use the TGSI_OPCODE_CMP (a < 0 ? b : c) for conditional moves, and the
* condition we produced is 0.0 or 1.0. By flipping the sign, we can
* choose which value TGSI_OPCODE_CMP produces without an extra instruction
* computing the condition.
*/
if (negate)
this->result.negate = ~this->result.negate;
return switch_order;
}
void
glsl_to_tgsi_visitor::visit(ir_assignment *ir)
{
st_dst_reg l;
st_src_reg r;
int i;
ir->rhs->accept(this);
r = this->result;
l = get_assignment_lhs(ir->lhs, this);
/* FINISHME: This should really set to the correct maximal writemask for each
* FINISHME: component written (in the loops below). This case can only
* FINISHME: occur for matrices, arrays, and structures.
*/
if (ir->write_mask == 0) {
assert(!ir->lhs->type->is_scalar() && !ir->lhs->type->is_vector());
l.writemask = WRITEMASK_XYZW;
} else if (ir->lhs->type->is_scalar() &&
ir->lhs->variable_referenced()->mode == ir_var_out) {
/* FINISHME: This hack makes writing to gl_FragDepth, which lives in the
* FINISHME: W component of fragment shader output zero, work correctly.
*/
l.writemask = WRITEMASK_XYZW;
} else {
int swizzles[4];
int first_enabled_chan = 0;
int rhs_chan = 0;
l.writemask = ir->write_mask;
for (int i = 0; i < 4; i++) {
if (l.writemask & (1 << i)) {
first_enabled_chan = GET_SWZ(r.swizzle, i);
break;
}
}
/* Swizzle a small RHS vector into the channels being written.
*
* glsl ir treats write_mask as dictating how many channels are
* present on the RHS while TGSI treats write_mask as just
* showing which channels of the vec4 RHS get written.
*/
for (int i = 0; i < 4; i++) {
if (l.writemask & (1 << i))
swizzles[i] = GET_SWZ(r.swizzle, rhs_chan++);
else
swizzles[i] = first_enabled_chan;
}
r.swizzle = MAKE_SWIZZLE4(swizzles[0], swizzles[1],
swizzles[2], swizzles[3]);
}
assert(l.file != PROGRAM_UNDEFINED);
assert(r.file != PROGRAM_UNDEFINED);
if (ir->condition) {
const bool switch_order = this->process_move_condition(ir->condition);
st_src_reg condition = this->result;
for (i = 0; i < type_size(ir->lhs->type); i++) {
st_src_reg l_src = st_src_reg(l);
st_src_reg condition_temp = condition;
l_src.swizzle = swizzle_for_size(ir->lhs->type->vector_elements);
if (native_integers) {
/* This is necessary because TGSI's CMP instruction expects the
* condition to be a float, and we store booleans as integers.
* If TGSI had a UCMP instruction or similar, this extra
* instruction would not be necessary.
*/
condition_temp = get_temp(glsl_type::vec4_type);
condition.negate = 0;
emit(ir, TGSI_OPCODE_I2F, st_dst_reg(condition_temp), condition);
condition_temp.swizzle = condition.swizzle;
}
if (switch_order) {
emit(ir, TGSI_OPCODE_CMP, l, condition_temp, l_src, r);
} else {
emit(ir, TGSI_OPCODE_CMP, l, condition_temp, r, l_src);
}
l.index++;
r.index++;
}
} else if (ir->rhs->as_expression() &&
this->instructions.get_tail() &&
ir->rhs == ((glsl_to_tgsi_instruction *)this->instructions.get_tail())->ir &&
type_size(ir->lhs->type) == 1 &&
l.writemask == ((glsl_to_tgsi_instruction *)this->instructions.get_tail())->dst.writemask) {
/* To avoid emitting an extra MOV when assigning an expression to a
* variable, emit the last instruction of the expression again, but
* replace the destination register with the target of the assignment.
* Dead code elimination will remove the original instruction.
*/
glsl_to_tgsi_instruction *inst, *new_inst;
inst = (glsl_to_tgsi_instruction *)this->instructions.get_tail();
new_inst = emit(ir, inst->op, l, inst->src[0], inst->src[1], inst->src[2]);
new_inst->saturate = inst->saturate;
inst->dead_mask = inst->dst.writemask;
} else {
for (i = 0; i < type_size(ir->lhs->type); i++) {
if (ir->rhs->type->is_array())
r.type = ir->rhs->type->element_type()->base_type;
else if (ir->rhs->type->is_record())
r.type = ir->rhs->type->fields.structure[i].type->base_type;
emit(ir, TGSI_OPCODE_MOV, l, r);
l.index++;
r.index++;
}
}
}
void
glsl_to_tgsi_visitor::visit(ir_constant *ir)
{
st_src_reg src;
GLfloat stack_vals[4] = { 0 };
gl_constant_value *values = (gl_constant_value *) stack_vals;
GLenum gl_type = GL_NONE;
unsigned int i;
static int in_array = 0;
gl_register_file file = in_array ? PROGRAM_CONSTANT : PROGRAM_IMMEDIATE;
/* Unfortunately, 4 floats is all we can get into
* _mesa_add_typed_unnamed_constant. So, make a temp to store an
* aggregate constant and move each constant value into it. If we
* get lucky, copy propagation will eliminate the extra moves.
*/
if (ir->type->base_type == GLSL_TYPE_STRUCT) {
st_src_reg temp_base = get_temp(ir->type);
st_dst_reg temp = st_dst_reg(temp_base);
foreach_iter(exec_list_iterator, iter, ir->components) {
ir_constant *field_value = (ir_constant *)iter.get();
int size = type_size(field_value->type);
assert(size > 0);
field_value->accept(this);
src = this->result;
for (i = 0; i < (unsigned int)size; i++) {
emit(ir, TGSI_OPCODE_MOV, temp, src);
src.index++;
temp.index++;
}
}
this->result = temp_base;
return;
}
if (ir->type->is_array()) {
st_src_reg temp_base = get_temp(ir->type);
st_dst_reg temp = st_dst_reg(temp_base);
int size = type_size(ir->type->fields.array);
assert(size > 0);
in_array++;
for (i = 0; i < ir->type->length; i++) {
ir->array_elements[i]->accept(this);
src = this->result;
for (int j = 0; j < size; j++) {
emit(ir, TGSI_OPCODE_MOV, temp, src);
src.index++;
temp.index++;
}
}
this->result = temp_base;
in_array--;
return;
}
if (ir->type->is_matrix()) {
st_src_reg mat = get_temp(ir->type);
st_dst_reg mat_column = st_dst_reg(mat);
for (i = 0; i < ir->type->matrix_columns; i++) {
assert(ir->type->base_type == GLSL_TYPE_FLOAT);
values = (gl_constant_value *) &ir->value.f[i * ir->type->vector_elements];
src = st_src_reg(file, -1, ir->type->base_type);
src.index = add_constant(file,
values,
ir->type->vector_elements,
GL_FLOAT,
&src.swizzle);
emit(ir, TGSI_OPCODE_MOV, mat_column, src);
mat_column.index++;
}
this->result = mat;
return;
}
switch (ir->type->base_type) {
case GLSL_TYPE_FLOAT:
gl_type = GL_FLOAT;
for (i = 0; i < ir->type->vector_elements; i++) {
values[i].f = ir->value.f[i];
}
break;
case GLSL_TYPE_UINT:
gl_type = native_integers ? GL_UNSIGNED_INT : GL_FLOAT;
for (i = 0; i < ir->type->vector_elements; i++) {
if (native_integers)
values[i].u = ir->value.u[i];
else
values[i].f = ir->value.u[i];
}
break;
case GLSL_TYPE_INT:
gl_type = native_integers ? GL_INT : GL_FLOAT;
for (i = 0; i < ir->type->vector_elements; i++) {
if (native_integers)
values[i].i = ir->value.i[i];
else
values[i].f = ir->value.i[i];
}
break;
case GLSL_TYPE_BOOL:
gl_type = native_integers ? GL_BOOL : GL_FLOAT;
for (i = 0; i < ir->type->vector_elements; i++) {
if (native_integers)
values[i].u = ir->value.b[i] ? ~0 : 0;
else
values[i].f = ir->value.b[i];
}
break;
default:
assert(!"Non-float/uint/int/bool constant");
}
this->result = st_src_reg(file, -1, ir->type);
this->result.index = add_constant(file,
values,
ir->type->vector_elements,
gl_type,
&this->result.swizzle);
}
function_entry *
glsl_to_tgsi_visitor::get_function_signature(ir_function_signature *sig)
{
function_entry *entry;
foreach_iter(exec_list_iterator, iter, this->function_signatures) {
entry = (function_entry *)iter.get();
if (entry->sig == sig)
return entry;
}
entry = ralloc(mem_ctx, function_entry);
entry->sig = sig;
entry->sig_id = this->next_signature_id++;
entry->bgn_inst = NULL;
/* Allocate storage for all the parameters. */
foreach_iter(exec_list_iterator, iter, sig->parameters) {
ir_variable *param = (ir_variable *)iter.get();
variable_storage *storage;
storage = find_variable_storage(param);
assert(!storage);
storage = new(mem_ctx) variable_storage(param, PROGRAM_TEMPORARY,
this->next_temp);
this->variables.push_tail(storage);
this->next_temp += type_size(param->type);
}
if (!sig->return_type->is_void()) {
entry->return_reg = get_temp(sig->return_type);
} else {
entry->return_reg = undef_src;
}
this->function_signatures.push_tail(entry);
return entry;
}
void
glsl_to_tgsi_visitor::visit(ir_call *ir)
{
glsl_to_tgsi_instruction *call_inst;
ir_function_signature *sig = ir->callee;
function_entry *entry = get_function_signature(sig);
int i;
/* Process in parameters. */
exec_list_iterator sig_iter = sig->parameters.iterator();
foreach_iter(exec_list_iterator, iter, *ir) {
ir_rvalue *param_rval = (ir_rvalue *)iter.get();
ir_variable *param = (ir_variable *)sig_iter.get();
if (param->mode == ir_var_in ||
param->mode == ir_var_inout) {
variable_storage *storage = find_variable_storage(param);
assert(storage);
param_rval->accept(this);
st_src_reg r = this->result;
st_dst_reg l;
l.file = storage->file;
l.index = storage->index;
l.reladdr = NULL;
l.writemask = WRITEMASK_XYZW;
l.cond_mask = COND_TR;
for (i = 0; i < type_size(param->type); i++) {
emit(ir, TGSI_OPCODE_MOV, l, r);
l.index++;
r.index++;
}
}
sig_iter.next();
}
assert(!sig_iter.has_next());
/* Emit call instruction */
call_inst = emit(ir, TGSI_OPCODE_CAL);
call_inst->function = entry;
/* Process out parameters. */
sig_iter = sig->parameters.iterator();
foreach_iter(exec_list_iterator, iter, *ir) {
ir_rvalue *param_rval = (ir_rvalue *)iter.get();
ir_variable *param = (ir_variable *)sig_iter.get();
if (param->mode == ir_var_out ||
param->mode == ir_var_inout) {
variable_storage *storage = find_variable_storage(param);
assert(storage);
st_src_reg r;
r.file = storage->file;
r.index = storage->index;
r.reladdr = NULL;
r.swizzle = SWIZZLE_NOOP;
r.negate = 0;
param_rval->accept(this);
st_dst_reg l = st_dst_reg(this->result);
for (i = 0; i < type_size(param->type); i++) {
emit(ir, TGSI_OPCODE_MOV, l, r);
l.index++;
r.index++;
}
}
sig_iter.next();
}
assert(!sig_iter.has_next());
/* Process return value. */
this->result = entry->return_reg;
}
void
glsl_to_tgsi_visitor::visit(ir_texture *ir)
{
st_src_reg result_src, coord, lod_info, projector, dx, dy, offset;
st_dst_reg result_dst, coord_dst;
glsl_to_tgsi_instruction *inst = NULL;
unsigned opcode = TGSI_OPCODE_NOP;
if (ir->coordinate) {
ir->coordinate->accept(this);
/* Put our coords in a temp. We'll need to modify them for shadow,
* projection, or LOD, so the only case we'd use it as is is if
* we're doing plain old texturing. The optimization passes on
* glsl_to_tgsi_visitor should handle cleaning up our mess in that case.
*/
coord = get_temp(glsl_type::vec4_type);
coord_dst = st_dst_reg(coord);
emit(ir, TGSI_OPCODE_MOV, coord_dst, this->result);
}
if (ir->projector) {
ir->projector->accept(this);
projector = this->result;
}
/* Storage for our result. Ideally for an assignment we'd be using
* the actual storage for the result here, instead.
*/
result_src = get_temp(ir->type);
result_dst = st_dst_reg(result_src);
switch (ir->op) {
case ir_tex:
opcode = TGSI_OPCODE_TEX;
break;
case ir_txb:
opcode = TGSI_OPCODE_TXB;
ir->lod_info.bias->accept(this);
lod_info = this->result;
break;
case ir_txl:
opcode = TGSI_OPCODE_TXL;
ir->lod_info.lod->accept(this);
lod_info = this->result;
break;
case ir_txd:
opcode = TGSI_OPCODE_TXD;
ir->lod_info.grad.dPdx->accept(this);
dx = this->result;
ir->lod_info.grad.dPdy->accept(this);
dy = this->result;
break;
case ir_txs:
opcode = TGSI_OPCODE_TXQ;
ir->lod_info.lod->accept(this);
lod_info = this->result;
break;
case ir_txf:
opcode = TGSI_OPCODE_TXF;
ir->lod_info.lod->accept(this);
lod_info = this->result;
if (ir->offset) {
ir->offset->accept(this);
offset = this->result;
}
break;
}
const glsl_type *sampler_type = ir->sampler->type;
if (ir->projector) {
if (opcode == TGSI_OPCODE_TEX) {
/* Slot the projector in as the last component of the coord. */
coord_dst.writemask = WRITEMASK_W;
emit(ir, TGSI_OPCODE_MOV, coord_dst, projector);
coord_dst.writemask = WRITEMASK_XYZW;
opcode = TGSI_OPCODE_TXP;
} else {
st_src_reg coord_w = coord;
coord_w.swizzle = SWIZZLE_WWWW;
/* For the other TEX opcodes there's no projective version
* since the last slot is taken up by LOD info. Do the
* projective divide now.
*/
coord_dst.writemask = WRITEMASK_W;
emit(ir, TGSI_OPCODE_RCP, coord_dst, projector);
/* In the case where we have to project the coordinates "by hand,"
* the shadow comparator value must also be projected.
*/
st_src_reg tmp_src = coord;
if (ir->shadow_comparitor) {
/* Slot the shadow value in as the second to last component of the
* coord.
*/
ir->shadow_comparitor->accept(this);
tmp_src = get_temp(glsl_type::vec4_type);
st_dst_reg tmp_dst = st_dst_reg(tmp_src);
/* Projective division not allowed for array samplers. */
assert(!sampler_type->sampler_array);
tmp_dst.writemask = WRITEMASK_Z;
emit(ir, TGSI_OPCODE_MOV, tmp_dst, this->result);
tmp_dst.writemask = WRITEMASK_XY;
emit(ir, TGSI_OPCODE_MOV, tmp_dst, coord);
}
coord_dst.writemask = WRITEMASK_XYZ;
emit(ir, TGSI_OPCODE_MUL, coord_dst, tmp_src, coord_w);
coord_dst.writemask = WRITEMASK_XYZW;
coord.swizzle = SWIZZLE_XYZW;
}
}
/* If projection is done and the opcode is not TGSI_OPCODE_TXP, then the shadow
* comparator was put in the correct place (and projected) by the code,
* above, that handles by-hand projection.
*/
if (ir->shadow_comparitor && (!ir->projector || opcode == TGSI_OPCODE_TXP)) {
/* Slot the shadow value in as the second to last component of the
* coord.
*/
ir->shadow_comparitor->accept(this);
/* XXX This will need to be updated for cubemap array samplers. */
if ((sampler_type->sampler_dimensionality == GLSL_SAMPLER_DIM_2D &&
sampler_type->sampler_array) ||
sampler_type->sampler_dimensionality == GLSL_SAMPLER_DIM_CUBE) {
coord_dst.writemask = WRITEMASK_W;
} else {
coord_dst.writemask = WRITEMASK_Z;
}
emit(ir, TGSI_OPCODE_MOV, coord_dst, this->result);
coord_dst.writemask = WRITEMASK_XYZW;
}
if (opcode == TGSI_OPCODE_TXL || opcode == TGSI_OPCODE_TXB ||
opcode == TGSI_OPCODE_TXF) {
/* TGSI stores LOD or LOD bias in the last channel of the coords. */
coord_dst.writemask = WRITEMASK_W;
emit(ir, TGSI_OPCODE_MOV, coord_dst, lod_info);
coord_dst.writemask = WRITEMASK_XYZW;
}
if (opcode == TGSI_OPCODE_TXD)
inst = emit(ir, opcode, result_dst, coord, dx, dy);
else if (opcode == TGSI_OPCODE_TXQ)
inst = emit(ir, opcode, result_dst, lod_info);
else if (opcode == TGSI_OPCODE_TXF) {
inst = emit(ir, opcode, result_dst, coord);
} else
inst = emit(ir, opcode, result_dst, coord);
if (ir->shadow_comparitor)
inst->tex_shadow = GL_TRUE;
inst->sampler = _mesa_get_sampler_uniform_value(ir->sampler,
this->shader_program,
this->prog);
if (ir->offset) {
inst->tex_offset_num_offset = 1;
inst->tex_offsets[0].Index = offset.index;
inst->tex_offsets[0].File = offset.file;
inst->tex_offsets[0].SwizzleX = GET_SWZ(offset.swizzle, 0);
inst->tex_offsets[0].SwizzleY = GET_SWZ(offset.swizzle, 1);
inst->tex_offsets[0].SwizzleZ = GET_SWZ(offset.swizzle, 2);
}
switch (sampler_type->sampler_dimensionality) {
case GLSL_SAMPLER_DIM_1D:
inst->tex_target = (sampler_type->sampler_array)
? TEXTURE_1D_ARRAY_INDEX : TEXTURE_1D_INDEX;
break;
case GLSL_SAMPLER_DIM_2D:
inst->tex_target = (sampler_type->sampler_array)
? TEXTURE_2D_ARRAY_INDEX : TEXTURE_2D_INDEX;
break;
case GLSL_SAMPLER_DIM_3D:
inst->tex_target = TEXTURE_3D_INDEX;
break;
case GLSL_SAMPLER_DIM_CUBE:
inst->tex_target = TEXTURE_CUBE_INDEX;
break;
case GLSL_SAMPLER_DIM_RECT:
inst->tex_target = TEXTURE_RECT_INDEX;
break;
case GLSL_SAMPLER_DIM_BUF:
assert(!"FINISHME: Implement ARB_texture_buffer_object");
break;
case GLSL_SAMPLER_DIM_EXTERNAL:
inst->tex_target = TEXTURE_EXTERNAL_INDEX;
break;
default:
assert(!"Should not get here.");
}
this->result = result_src;
}
void
glsl_to_tgsi_visitor::visit(ir_return *ir)
{
if (ir->get_value()) {
st_dst_reg l;
int i;
assert(current_function);
ir->get_value()->accept(this);
st_src_reg r = this->result;
l = st_dst_reg(current_function->return_reg);
for (i = 0; i < type_size(current_function->sig->return_type); i++) {
emit(ir, TGSI_OPCODE_MOV, l, r);
l.index++;
r.index++;
}
}
emit(ir, TGSI_OPCODE_RET);
}
void
glsl_to_tgsi_visitor::visit(ir_discard *ir)
{
if (ir->condition) {
ir->condition->accept(this);
this->result.negate = ~this->result.negate;
emit(ir, TGSI_OPCODE_KIL, undef_dst, this->result);
} else {
emit(ir, TGSI_OPCODE_KILP);
}
}
void
glsl_to_tgsi_visitor::visit(ir_if *ir)
{
glsl_to_tgsi_instruction *cond_inst, *if_inst;
glsl_to_tgsi_instruction *prev_inst;
prev_inst = (glsl_to_tgsi_instruction *)this->instructions.get_tail();
ir->condition->accept(this);
assert(this->result.file != PROGRAM_UNDEFINED);
if (this->options->EmitCondCodes) {
cond_inst = (glsl_to_tgsi_instruction *)this->instructions.get_tail();
/* See if we actually generated any instruction for generating
* the condition. If not, then cook up a move to a temp so we
* have something to set cond_update on.
*/
if (cond_inst == prev_inst) {
st_src_reg temp = get_temp(glsl_type::bool_type);
cond_inst = emit(ir->condition, TGSI_OPCODE_MOV, st_dst_reg(temp), result);
}
cond_inst->cond_update = GL_TRUE;
if_inst = emit(ir->condition, TGSI_OPCODE_IF);
if_inst->dst.cond_mask = COND_NE;
} else {
if_inst = emit(ir->condition, TGSI_OPCODE_IF, undef_dst, this->result);
}
this->instructions.push_tail(if_inst);
visit_exec_list(&ir->then_instructions, this);
if (!ir->else_instructions.is_empty()) {
emit(ir->condition, TGSI_OPCODE_ELSE);
visit_exec_list(&ir->else_instructions, this);
}
if_inst = emit(ir->condition, TGSI_OPCODE_ENDIF);
}
glsl_to_tgsi_visitor::glsl_to_tgsi_visitor()
{
result.file = PROGRAM_UNDEFINED;
next_temp = 1;
next_signature_id = 1;
num_immediates = 0;
current_function = NULL;
num_address_regs = 0;
samplers_used = 0;
indirect_addr_temps = false;
indirect_addr_consts = false;
glsl_version = 0;
native_integers = false;
mem_ctx = ralloc_context(NULL);
ctx = NULL;
prog = NULL;
shader_program = NULL;
options = NULL;
}
glsl_to_tgsi_visitor::~glsl_to_tgsi_visitor()
{
ralloc_free(mem_ctx);
}
extern "C" void free_glsl_to_tgsi_visitor(glsl_to_tgsi_visitor *v)
{
delete v;
}
/**
* Count resources used by the given gpu program (number of texture
* samplers, etc).
*/
static void
count_resources(glsl_to_tgsi_visitor *v, gl_program *prog)
{
v->samplers_used = 0;
foreach_iter(exec_list_iterator, iter, v->instructions) {
glsl_to_tgsi_instruction *inst = (glsl_to_tgsi_instruction *)iter.get();
if (is_tex_instruction(inst->op)) {
v->samplers_used |= 1 << inst->sampler;
if (inst->tex_shadow) {
prog->ShadowSamplers |= 1 << inst->sampler;
}
}
}
prog->SamplersUsed = v->samplers_used;
if (v->shader_program != NULL)
_mesa_update_shader_textures_used(v->shader_program, prog);
}
static void
set_uniform_initializer(struct gl_context *ctx, void *mem_ctx,
struct gl_shader_program *shader_program,
const char *name, const glsl_type *type,
ir_constant *val)
{
if (type->is_record()) {
ir_constant *field_constant;
field_constant = (ir_constant *)val->components.get_head();
for (unsigned int i = 0; i < type->length; i++) {
const glsl_type *field_type = type->fields.structure[i].type;
const char *field_name = ralloc_asprintf(mem_ctx, "%s.%s", name,
type->fields.structure[i].name);
set_uniform_initializer(ctx, mem_ctx, shader_program, field_name,
field_type, field_constant);
field_constant = (ir_constant *)field_constant->next;
}
return;
}
unsigned offset;
unsigned index = _mesa_get_uniform_location(ctx, shader_program, name,
&offset);
if (offset == GL_INVALID_INDEX) {
fail_link(shader_program,
"Couldn't find uniform for initializer %s\n", name);
return;
}
int loc = _mesa_uniform_merge_location_offset(index, offset);
for (unsigned int i = 0; i < (type->is_array() ? type->length : 1); i++) {
ir_constant *element;
const glsl_type *element_type;
if (type->is_array()) {
element = val->array_elements[i];
element_type = type->fields.array;
} else {
element = val;
element_type = type;
}
void *values;
if (element_type->base_type == GLSL_TYPE_BOOL) {
int *conv = ralloc_array(mem_ctx, int, element_type->components());
for (unsigned int j = 0; j < element_type->components(); j++) {
conv[j] = element->value.b[j];
}
values = (void *)conv;
element_type = glsl_type::get_instance(GLSL_TYPE_INT,
element_type->vector_elements,
1);
} else {
values = &element->value;
}
if (element_type->is_matrix()) {
_mesa_uniform_matrix(ctx, shader_program,
element_type->matrix_columns,
element_type->vector_elements,
loc, 1, GL_FALSE, (GLfloat *)values);
} else {
_mesa_uniform(ctx, shader_program, loc, element_type->matrix_columns,
values, element_type->gl_type);
}
loc++;
}
}
/**
* Returns the mask of channels (bitmask of WRITEMASK_X,Y,Z,W) which
* are read from the given src in this instruction
*/
static int
get_src_arg_mask(st_dst_reg dst, st_src_reg src)
{
int read_mask = 0, comp;
/* Now, given the src swizzle and the written channels, find which
* components are actually read
*/
for (comp = 0; comp < 4; ++comp) {
const unsigned coord = GET_SWZ(src.swizzle, comp);
ASSERT(coord < 4);
if (dst.writemask & (1 << comp) && coord <= SWIZZLE_W)
read_mask |= 1 << coord;
}
return read_mask;
}
/**
* This pass replaces CMP T0, T1 T2 T0 with MOV T0, T2 when the CMP
* instruction is the first instruction to write to register T0. There are
* several lowering passes done in GLSL IR (e.g. branches and
* relative addressing) that create a large number of conditional assignments
* that ir_to_mesa converts to CMP instructions like the one mentioned above.
*
* Here is why this conversion is safe:
* CMP T0, T1 T2 T0 can be expanded to:
* if (T1 < 0.0)
* MOV T0, T2;
* else
* MOV T0, T0;
*
* If (T1 < 0.0) evaluates to true then our replacement MOV T0, T2 is the same
* as the original program. If (T1 < 0.0) evaluates to false, executing
* MOV T0, T0 will store a garbage value in T0 since T0 is uninitialized.
* Therefore, it doesn't matter that we are replacing MOV T0, T0 with MOV T0, T2
* because any instruction that was going to read from T0 after this was going
* to read a garbage value anyway.
*/
void
glsl_to_tgsi_visitor::simplify_cmp(void)
{
unsigned *tempWrites;
unsigned outputWrites[MAX_PROGRAM_OUTPUTS];
tempWrites = new unsigned[MAX_TEMPS];
if (!tempWrites) {
return;
}
memset(tempWrites, 0, sizeof(unsigned) * MAX_TEMPS);
memset(outputWrites, 0, sizeof(outputWrites));
foreach_iter(exec_list_iterator, iter, this->instructions) {
glsl_to_tgsi_instruction *inst = (glsl_to_tgsi_instruction *)iter.get();
unsigned prevWriteMask = 0;
/* Give up if we encounter relative addressing or flow control. */
if (inst->dst.reladdr ||
tgsi_get_opcode_info(inst->op)->is_branch ||
inst->op == TGSI_OPCODE_BGNSUB ||
inst->op == TGSI_OPCODE_CONT ||
inst->op == TGSI_OPCODE_END ||
inst->op == TGSI_OPCODE_ENDSUB ||
inst->op == TGSI_OPCODE_RET) {
break;
}
if (inst->dst.file == PROGRAM_OUTPUT) {
assert(inst->dst.index < MAX_PROGRAM_OUTPUTS);
prevWriteMask = outputWrites[inst->dst.index];
outputWrites[inst->dst.index] |= inst->dst.writemask;
} else if (inst->dst.file == PROGRAM_TEMPORARY) {
assert(inst->dst.index < MAX_TEMPS);
prevWriteMask = tempWrites[inst->dst.index];
tempWrites[inst->dst.index] |= inst->dst.writemask;
}
/* For a CMP to be considered a conditional write, the destination
* register and source register two must be the same. */
if (inst->op == TGSI_OPCODE_CMP
&& !(inst->dst.writemask & prevWriteMask)
&& inst->src[2].file == inst->dst.file
&& inst->src[2].index == inst->dst.index
&& inst->dst.writemask == get_src_arg_mask(inst->dst, inst->src[2])) {
inst->op = TGSI_OPCODE_MOV;
inst->src[0] = inst->src[1];
}
}
delete [] tempWrites;
}
/* Replaces all references to a temporary register index with another index. */
void
glsl_to_tgsi_visitor::rename_temp_register(int index, int new_index)
{
foreach_iter(exec_list_iterator, iter, this->instructions) {
glsl_to_tgsi_instruction *inst = (glsl_to_tgsi_instruction *)iter.get();
unsigned j;
for (j=0; j < num_inst_src_regs(inst->op); j++) {
if (inst->src[j].file == PROGRAM_TEMPORARY &&
inst->src[j].index == index) {
inst->src[j].index = new_index;
}
}
if (inst->dst.file == PROGRAM_TEMPORARY && inst->dst.index == index) {
inst->dst.index = new_index;
}
}
}
int
glsl_to_tgsi_visitor::get_first_temp_read(int index)
{
int depth = 0; /* loop depth */
int loop_start = -1; /* index of the first active BGNLOOP (if any) */
unsigned i = 0, j;
foreach_iter(exec_list_iterator, iter, this->instructions) {
glsl_to_tgsi_instruction *inst = (glsl_to_tgsi_instruction *)iter.get();
for (j=0; j < num_inst_src_regs(inst->op); j++) {
if (inst->src[j].file == PROGRAM_TEMPORARY &&
inst->src[j].index == index) {
return (depth == 0) ? i : loop_start;
}
}
if (inst->op == TGSI_OPCODE_BGNLOOP) {
if(depth++ == 0)
loop_start = i;
} else if (inst->op == TGSI_OPCODE_ENDLOOP) {
if (--depth == 0)
loop_start = -1;
}
assert(depth >= 0);
i++;
}
return -1;
}
int
glsl_to_tgsi_visitor::get_first_temp_write(int index)
{
int depth = 0; /* loop depth */
int loop_start = -1; /* index of the first active BGNLOOP (if any) */
int i = 0;
foreach_iter(exec_list_iterator, iter, this->instructions) {
glsl_to_tgsi_instruction *inst = (glsl_to_tgsi_instruction *)iter.get();
if (inst->dst.file == PROGRAM_TEMPORARY && inst->dst.index == index) {
return (depth == 0) ? i : loop_start;
}
if (inst->op == TGSI_OPCODE_BGNLOOP) {
if(depth++ == 0)
loop_start = i;
} else if (inst->op == TGSI_OPCODE_ENDLOOP) {
if (--depth == 0)
loop_start = -1;
}
assert(depth >= 0);
i++;
}
return -1;
}
int
glsl_to_tgsi_visitor::get_last_temp_read(int index)
{
int depth = 0; /* loop depth */
int last = -1; /* index of last instruction that reads the temporary */
unsigned i = 0, j;
foreach_iter(exec_list_iterator, iter, this->instructions) {
glsl_to_tgsi_instruction *inst = (glsl_to_tgsi_instruction *)iter.get();
for (j=0; j < num_inst_src_regs(inst->op); j++) {
if (inst->src[j].file == PROGRAM_TEMPORARY &&
inst->src[j].index == index) {
last = (depth == 0) ? i : -2;
}
}
if (inst->op == TGSI_OPCODE_BGNLOOP)
depth++;
else if (inst->op == TGSI_OPCODE_ENDLOOP)
if (--depth == 0 && last == -2)
last = i;
assert(depth >= 0);
i++;
}
assert(last >= -1);
return last;
}
int
glsl_to_tgsi_visitor::get_last_temp_write(int index)
{
int depth = 0; /* loop depth */
int last = -1; /* index of last instruction that writes to the temporary */
int i = 0;
foreach_iter(exec_list_iterator, iter, this->instructions) {
glsl_to_tgsi_instruction *inst = (glsl_to_tgsi_instruction *)iter.get();
if (inst->dst.file == PROGRAM_TEMPORARY && inst->dst.index == index)
last = (depth == 0) ? i : -2;
if (inst->op == TGSI_OPCODE_BGNLOOP)
depth++;
else if (inst->op == TGSI_OPCODE_ENDLOOP)
if (--depth == 0 && last == -2)
last = i;
assert(depth >= 0);
i++;
}
assert(last >= -1);
return last;
}
/*
* On a basic block basis, tracks available PROGRAM_TEMPORARY register
* channels for copy propagation and updates following instructions to
* use the original versions.
*
* The glsl_to_tgsi_visitor lazily produces code assuming that this pass
* will occur. As an example, a TXP production before this pass:
*
* 0: MOV TEMP[1], INPUT[4].xyyy;
* 1: MOV TEMP[1].w, INPUT[4].wwww;
* 2: TXP TEMP[2], TEMP[1], texture[0], 2D;
*
* and after:
*
* 0: MOV TEMP[1], INPUT[4].xyyy;
* 1: MOV TEMP[1].w, INPUT[4].wwww;
* 2: TXP TEMP[2], INPUT[4].xyyw, texture[0], 2D;
*
* which allows for dead code elimination on TEMP[1]'s writes.
*/
void
glsl_to_tgsi_visitor::copy_propagate(void)
{
glsl_to_tgsi_instruction **acp = rzalloc_array(mem_ctx,
glsl_to_tgsi_instruction *,
this->next_temp * 4);
int *acp_level = rzalloc_array(mem_ctx, int, this->next_temp * 4);
int level = 0;
foreach_iter(exec_list_iterator, iter, this->instructions) {
glsl_to_tgsi_instruction *inst = (glsl_to_tgsi_instruction *)iter.get();
assert(inst->dst.file != PROGRAM_TEMPORARY
|| inst->dst.index < this->next_temp);
/* First, do any copy propagation possible into the src regs. */
for (int r = 0; r < 3; r++) {
glsl_to_tgsi_instruction *first = NULL;
bool good = true;
int acp_base = inst->src[r].index * 4;
if (inst->src[r].file != PROGRAM_TEMPORARY ||
inst->src[r].reladdr)
continue;
/* See if we can find entries in the ACP consisting of MOVs
* from the same src register for all the swizzled channels
* of this src register reference.
*/
for (int i = 0; i < 4; i++) {
int src_chan = GET_SWZ(inst->src[r].swizzle, i);
glsl_to_tgsi_instruction *copy_chan = acp[acp_base + src_chan];
if (!copy_chan) {
good = false;
break;
}
assert(acp_level[acp_base + src_chan] <= level);
if (!first) {
first = copy_chan;
} else {
if (first->src[0].file != copy_chan->src[0].file ||
first->src[0].index != copy_chan->src[0].index) {
good = false;
break;
}
}
}
if (good) {
/* We've now validated that we can copy-propagate to
* replace this src register reference. Do it.
*/
inst->src[r].file = first->src[0].file;
inst->src[r].index = first->src[0].index;
int swizzle = 0;
for (int i = 0; i < 4; i++) {
int src_chan = GET_SWZ(inst->src[r].swizzle, i);
glsl_to_tgsi_instruction *copy_inst = acp[acp_base + src_chan];
swizzle |= (GET_SWZ(copy_inst->src[0].swizzle, src_chan) <<
(3 * i));
}
inst->src[r].swizzle = swizzle;
}
}
switch (inst->op) {
case TGSI_OPCODE_BGNLOOP:
case TGSI_OPCODE_ENDLOOP:
/* End of a basic block, clear the ACP entirely. */
memset(acp, 0, sizeof(*acp) * this->next_temp * 4);
break;
case TGSI_OPCODE_IF:
++level;
break;
case TGSI_OPCODE_ENDIF:
case TGSI_OPCODE_ELSE:
/* Clear all channels written inside the block from the ACP, but
* leaving those that were not touched.
*/
for (int r = 0; r < this->next_temp; r++) {
for (int c = 0; c < 4; c++) {
if (!acp[4 * r + c])
continue;
if (acp_level[4 * r + c] >= level)
acp[4 * r + c] = NULL;
}
}
if (inst->op == TGSI_OPCODE_ENDIF)
--level;
break;
default:
/* Continuing the block, clear any written channels from
* the ACP.
*/
if (inst->dst.file == PROGRAM_TEMPORARY && inst->dst.reladdr) {
/* Any temporary might be written, so no copy propagation
* across this instruction.
*/
memset(acp, 0, sizeof(*acp) * this->next_temp * 4);
} else if (inst->dst.file == PROGRAM_OUTPUT &&
inst->dst.reladdr) {
/* Any output might be written, so no copy propagation
* from outputs across this instruction.
*/
for (int r = 0; r < this->next_temp; r++) {
for (int c = 0; c < 4; c++) {
if (!acp[4 * r + c])
continue;
if (acp[4 * r + c]->src[0].file == PROGRAM_OUTPUT)
acp[4 * r + c] = NULL;
}
}
} else if (inst->dst.file == PROGRAM_TEMPORARY ||
inst->dst.file == PROGRAM_OUTPUT) {
/* Clear where it's used as dst. */
if (inst->dst.file == PROGRAM_TEMPORARY) {
for (int c = 0; c < 4; c++) {
if (inst->dst.writemask & (1 << c)) {
acp[4 * inst->dst.index + c] = NULL;
}
}
}
/* Clear where it's used as src. */
for (int r = 0; r < this->next_temp; r++) {
for (int c = 0; c < 4; c++) {
if (!acp[4 * r + c])
continue;
int src_chan = GET_SWZ(acp[4 * r + c]->src[0].swizzle, c);
if (acp[4 * r + c]->src[0].file == inst->dst.file &&
acp[4 * r + c]->src[0].index == inst->dst.index &&
inst->dst.writemask & (1 << src_chan))
{
acp[4 * r + c] = NULL;
}
}
}
}
break;
}
/* If this is a copy, add it to the ACP. */
if (inst->op == TGSI_OPCODE_MOV &&
inst->dst.file == PROGRAM_TEMPORARY &&
!inst->dst.reladdr &&
!inst->saturate &&
!inst->src[0].reladdr &&
!inst->src[0].negate) {
for (int i = 0; i < 4; i++) {
if (inst->dst.writemask & (1 << i)) {
acp[4 * inst->dst.index + i] = inst;
acp_level[4 * inst->dst.index + i] = level;
}
}
}
}
ralloc_free(acp_level);
ralloc_free(acp);
}
/*
* Tracks available PROGRAM_TEMPORARY registers for dead code elimination.
*
* The glsl_to_tgsi_visitor lazily produces code assuming that this pass
* will occur. As an example, a TXP production after copy propagation but
* before this pass:
*
* 0: MOV TEMP[1], INPUT[4].xyyy;
* 1: MOV TEMP[1].w, INPUT[4].wwww;
* 2: TXP TEMP[2], INPUT[4].xyyw, texture[0], 2D;
*
* and after this pass:
*
* 0: TXP TEMP[2], INPUT[4].xyyw, texture[0], 2D;
*
* FIXME: assumes that all functions are inlined (no support for BGNSUB/ENDSUB)
* FIXME: doesn't eliminate all dead code inside of loops; it steps around them
*/
void
glsl_to_tgsi_visitor::eliminate_dead_code(void)
{
int i;
for (i=0; i < this->next_temp; i++) {
int last_read = get_last_temp_read(i);
int j = 0;
foreach_iter(exec_list_iterator, iter, this->instructions) {
glsl_to_tgsi_instruction *inst = (glsl_to_tgsi_instruction *)iter.get();
if (inst->dst.file == PROGRAM_TEMPORARY && inst->dst.index == i &&
j > last_read)
{
iter.remove();
delete inst;
}
j++;
}
}
}
/*
* On a basic block basis, tracks available PROGRAM_TEMPORARY registers for dead
* code elimination. This is less primitive than eliminate_dead_code(), as it
* is per-channel and can detect consecutive writes without a read between them
* as dead code. However, there is some dead code that can be eliminated by
* eliminate_dead_code() but not this function - for example, this function
* cannot eliminate an instruction writing to a register that is never read and
* is the only instruction writing to that register.
*
* The glsl_to_tgsi_visitor lazily produces code assuming that this pass
* will occur.
*/
int
glsl_to_tgsi_visitor::eliminate_dead_code_advanced(void)
{
glsl_to_tgsi_instruction **writes = rzalloc_array(mem_ctx,
glsl_to_tgsi_instruction *,
this->next_temp * 4);
int *write_level = rzalloc_array(mem_ctx, int, this->next_temp * 4);
int level = 0;
int removed = 0;
foreach_iter(exec_list_iterator, iter, this->instructions) {
glsl_to_tgsi_instruction *inst = (glsl_to_tgsi_instruction *)iter.get();
assert(inst->dst.file != PROGRAM_TEMPORARY
|| inst->dst.index < this->next_temp);
switch (inst->op) {
case TGSI_OPCODE_BGNLOOP:
case TGSI_OPCODE_ENDLOOP:
case TGSI_OPCODE_CONT:
case TGSI_OPCODE_BRK:
/* End of a basic block, clear the write array entirely.
*
* This keeps us from killing dead code when the writes are
* on either side of a loop, even when the register isn't touched
* inside the loop. However, glsl_to_tgsi_visitor doesn't seem to emit
* dead code of this type, so it shouldn't make a difference as long as
* the dead code elimination pass in the GLSL compiler does its job.
*/
memset(writes, 0, sizeof(*writes) * this->next_temp * 4);
break;
case TGSI_OPCODE_ENDIF:
case TGSI_OPCODE_ELSE:
/* Promote the recorded level of all channels written inside the
* preceding if or else block to the level above the if/else block.
*/
for (int r = 0; r < this->next_temp; r++) {
for (int c = 0; c < 4; c++) {
if (!writes[4 * r + c])
continue;
if (write_level[4 * r + c] == level)
write_level[4 * r + c] = level-1;
}
}
if(inst->op == TGSI_OPCODE_ENDIF)
--level;
break;
case TGSI_OPCODE_IF:
++level;
/* fallthrough to default case to mark the condition as read */
default:
/* Continuing the block, clear any channels from the write array that
* are read by this instruction.
*/
for (unsigned i = 0; i < Elements(inst->src); i++) {
if (inst->src[i].file == PROGRAM_TEMPORARY && inst->src[i].reladdr){
/* Any temporary might be read, so no dead code elimination
* across this instruction.
*/
memset(writes, 0, sizeof(*writes) * this->next_temp * 4);
} else if (inst->src[i].file == PROGRAM_TEMPORARY) {
/* Clear where it's used as src. */
int src_chans = 1 << GET_SWZ(inst->src[i].swizzle, 0);
src_chans |= 1 << GET_SWZ(inst->src[i].swizzle, 1);
src_chans |= 1 << GET_SWZ(inst->src[i].swizzle, 2);
src_chans |= 1 << GET_SWZ(inst->src[i].swizzle, 3);
for (int c = 0; c < 4; c++) {
if (src_chans & (1 << c)) {
writes[4 * inst->src[i].index + c] = NULL;
}
}
}
}
break;
}
/* If this instruction writes to a temporary, add it to the write array.
* If there is already an instruction in the write array for one or more
* of the channels, flag that channel write as dead.
*/
if (inst->dst.file == PROGRAM_TEMPORARY &&
!inst->dst.reladdr &&
!inst->saturate) {
for (int c = 0; c < 4; c++) {
if (inst->dst.writemask & (1 << c)) {
if (writes[4 * inst->dst.index + c]) {
if (write_level[4 * inst->dst.index + c] < level)
continue;
else
writes[4 * inst->dst.index + c]->dead_mask |= (1 << c);
}
writes[4 * inst->dst.index + c] = inst;
write_level[4 * inst->dst.index + c] = level;
}
}
}
}
/* Anything still in the write array at this point is dead code. */
for (int r = 0; r < this->next_temp; r++) {
for (int c = 0; c < 4; c++) {
glsl_to_tgsi_instruction *inst = writes[4 * r + c];
if (inst)
inst->dead_mask |= (1 << c);
}
}
/* Now actually remove the instructions that are completely dead and update
* the writemask of other instructions with dead channels.
*/
foreach_iter(exec_list_iterator, iter, this->instructions) {
glsl_to_tgsi_instruction *inst = (glsl_to_tgsi_instruction *)iter.get();
if (!inst->dead_mask || !inst->dst.writemask)
continue;
else if ((inst->dst.writemask & ~inst->dead_mask) == 0) {
iter.remove();
delete inst;
removed++;
} else
inst->dst.writemask &= ~(inst->dead_mask);
}
ralloc_free(write_level);
ralloc_free(writes);
return removed;
}
/* Merges temporary registers together where possible to reduce the number of
* registers needed to run a program.
*
* Produces optimal code only after copy propagation and dead code elimination
* have been run. */
void
glsl_to_tgsi_visitor::merge_registers(void)
{
int *last_reads = rzalloc_array(mem_ctx, int, this->next_temp);
int *first_writes = rzalloc_array(mem_ctx, int, this->next_temp);
int i, j;
/* Read the indices of the last read and first write to each temp register
* into an array so that we don't have to traverse the instruction list as
* much. */
for (i=0; i < this->next_temp; i++) {
last_reads[i] = get_last_temp_read(i);
first_writes[i] = get_first_temp_write(i);
}
/* Start looking for registers with non-overlapping usages that can be
* merged together. */
for (i=0; i < this->next_temp; i++) {
/* Don't touch unused registers. */
if (last_reads[i] < 0 || first_writes[i] < 0) continue;
for (j=0; j < this->next_temp; j++) {
/* Don't touch unused registers. */
if (last_reads[j] < 0 || first_writes[j] < 0) continue;
/* We can merge the two registers if the first write to j is after or
* in the same instruction as the last read from i. Note that the
* register at index i will always be used earlier or at the same time
* as the register at index j. */
if (first_writes[i] <= first_writes[j] &&
last_reads[i] <= first_writes[j])
{
rename_temp_register(j, i); /* Replace all references to j with i.*/
/* Update the first_writes and last_reads arrays with the new
* values for the merged register index, and mark the newly unused
* register index as such. */
last_reads[i] = last_reads[j];
first_writes[j] = -1;
last_reads[j] = -1;
}
}
}
ralloc_free(last_reads);
ralloc_free(first_writes);
}
/* Reassign indices to temporary registers by reusing unused indices created
* by optimization passes. */
void
glsl_to_tgsi_visitor::renumber_registers(void)
{
int i = 0;
int new_index = 0;
for (i=0; i < this->next_temp; i++) {
if (get_first_temp_read(i) < 0) continue;
if (i != new_index)
rename_temp_register(i, new_index);
new_index++;
}
this->next_temp = new_index;
}
/**
* Returns a fragment program which implements the current pixel transfer ops.
* Based on get_pixel_transfer_program in st_atom_pixeltransfer.c.
*/
extern "C" void
get_pixel_transfer_visitor(struct st_fragment_program *fp,
glsl_to_tgsi_visitor *original,
int scale_and_bias, int pixel_maps)
{
glsl_to_tgsi_visitor *v = new glsl_to_tgsi_visitor();
struct st_context *st = st_context(original->ctx);
struct gl_program *prog = &fp->Base.Base;
struct gl_program_parameter_list *params = _mesa_new_parameter_list();
st_src_reg coord, src0;
st_dst_reg dst0;
glsl_to_tgsi_instruction *inst;
/* Copy attributes of the glsl_to_tgsi_visitor in the original shader. */
v->ctx = original->ctx;
v->prog = prog;
v->shader_program = NULL;
v->glsl_version = original->glsl_version;
v->native_integers = original->native_integers;
v->options = original->options;
v->next_temp = original->next_temp;
v->num_address_regs = original->num_address_regs;
v->samplers_used = prog->SamplersUsed = original->samplers_used;
v->indirect_addr_temps = original->indirect_addr_temps;
v->indirect_addr_consts = original->indirect_addr_consts;
memcpy(&v->immediates, &original->immediates, sizeof(v->immediates));
v->num_immediates = original->num_immediates;
/*
* Get initial pixel color from the texture.
* TEX colorTemp, fragment.texcoord[0], texture[0], 2D;
*/
coord = st_src_reg(PROGRAM_INPUT, FRAG_ATTRIB_TEX0, glsl_type::vec2_type);
src0 = v->get_temp(glsl_type::vec4_type);
dst0 = st_dst_reg(src0);
inst = v->emit(NULL, TGSI_OPCODE_TEX, dst0, coord);
inst->sampler = 0;
inst->tex_target = TEXTURE_2D_INDEX;
prog->InputsRead |= FRAG_BIT_TEX0;
prog->SamplersUsed |= (1 << 0); /* mark sampler 0 as used */
v->samplers_used |= (1 << 0);
if (scale_and_bias) {
static const gl_state_index scale_state[STATE_LENGTH] =
{ STATE_INTERNAL, STATE_PT_SCALE,
(gl_state_index) 0, (gl_state_index) 0, (gl_state_index) 0 };
static const gl_state_index bias_state[STATE_LENGTH] =
{ STATE_INTERNAL, STATE_PT_BIAS,
(gl_state_index) 0, (gl_state_index) 0, (gl_state_index) 0 };
GLint scale_p, bias_p;
st_src_reg scale, bias;
scale_p = _mesa_add_state_reference(params, scale_state);
bias_p = _mesa_add_state_reference(params, bias_state);
/* MAD colorTemp, colorTemp, scale, bias; */
scale = st_src_reg(PROGRAM_STATE_VAR, scale_p, GLSL_TYPE_FLOAT);
bias = st_src_reg(PROGRAM_STATE_VAR, bias_p, GLSL_TYPE_FLOAT);
inst = v->emit(NULL, TGSI_OPCODE_MAD, dst0, src0, scale, bias);
}
if (pixel_maps) {
st_src_reg temp = v->get_temp(glsl_type::vec4_type);
st_dst_reg temp_dst = st_dst_reg(temp);
assert(st->pixel_xfer.pixelmap_texture);
/* With a little effort, we can do four pixel map look-ups with
* two TEX instructions:
*/
/* TEX temp.rg, colorTemp.rgba, texture[1], 2D; */
temp_dst.writemask = WRITEMASK_XY; /* write R,G */
inst = v->emit(NULL, TGSI_OPCODE_TEX, temp_dst, src0);
inst->sampler = 1;
inst->tex_target = TEXTURE_2D_INDEX;
/* TEX temp.ba, colorTemp.baba, texture[1], 2D; */
src0.swizzle = MAKE_SWIZZLE4(SWIZZLE_Z, SWIZZLE_W, SWIZZLE_Z, SWIZZLE_W);
temp_dst.writemask = WRITEMASK_ZW; /* write B,A */
inst = v->emit(NULL, TGSI_OPCODE_TEX, temp_dst, src0);
inst->sampler = 1;
inst->tex_target = TEXTURE_2D_INDEX;
prog->SamplersUsed |= (1 << 1); /* mark sampler 1 as used */
v->samplers_used |= (1 << 1);
/* MOV colorTemp, temp; */
inst = v->emit(NULL, TGSI_OPCODE_MOV, dst0, temp);
}
/* Now copy the instructions from the original glsl_to_tgsi_visitor into the
* new visitor. */
foreach_iter(exec_list_iterator, iter, original->instructions) {
glsl_to_tgsi_instruction *inst = (glsl_to_tgsi_instruction *)iter.get();
glsl_to_tgsi_instruction *newinst;
st_src_reg src_regs[3];
if (inst->dst.file == PROGRAM_OUTPUT)
prog->OutputsWritten |= BITFIELD64_BIT(inst->dst.index);
for (int i=0; i<3; i++) {
src_regs[i] = inst->src[i];
if (src_regs[i].file == PROGRAM_INPUT &&
src_regs[i].index == FRAG_ATTRIB_COL0)
{
src_regs[i].file = PROGRAM_TEMPORARY;
src_regs[i].index = src0.index;
}
else if (src_regs[i].file == PROGRAM_INPUT)
prog->InputsRead |= BITFIELD64_BIT(src_regs[i].index);
}
newinst = v->emit(NULL, inst->op, inst->dst, src_regs[0], src_regs[1], src_regs[2]);
newinst->tex_target = inst->tex_target;
}
/* Make modifications to fragment program info. */
prog->Parameters = _mesa_combine_parameter_lists(params,
original->prog->Parameters);
_mesa_free_parameter_list(params);
count_resources(v, prog);
fp->glsl_to_tgsi = v;
}
/**
* Make fragment program for glBitmap:
* Sample the texture and kill the fragment if the bit is 0.
* This program will be combined with the user's fragment program.
*
* Based on make_bitmap_fragment_program in st_cb_bitmap.c.
*/
extern "C" void
get_bitmap_visitor(struct st_fragment_program *fp,
glsl_to_tgsi_visitor *original, int samplerIndex)
{
glsl_to_tgsi_visitor *v = new glsl_to_tgsi_visitor();
struct st_context *st = st_context(original->ctx);
struct gl_program *prog = &fp->Base.Base;
st_src_reg coord, src0;
st_dst_reg dst0;
glsl_to_tgsi_instruction *inst;
/* Copy attributes of the glsl_to_tgsi_visitor in the original shader. */
v->ctx = original->ctx;
v->prog = prog;
v->shader_program = NULL;
v->glsl_version = original->glsl_version;
v->native_integers = original->native_integers;
v->options = original->options;
v->next_temp = original->next_temp;
v->num_address_regs = original->num_address_regs;
v->samplers_used = prog->SamplersUsed = original->samplers_used;
v->indirect_addr_temps = original->indirect_addr_temps;
v->indirect_addr_consts = original->indirect_addr_consts;
memcpy(&v->immediates, &original->immediates, sizeof(v->immediates));
v->num_immediates = original->num_immediates;
/* TEX tmp0, fragment.texcoord[0], texture[0], 2D; */
coord = st_src_reg(PROGRAM_INPUT, FRAG_ATTRIB_TEX0, glsl_type::vec2_type);
src0 = v->get_temp(glsl_type::vec4_type);
dst0 = st_dst_reg(src0);
inst = v->emit(NULL, TGSI_OPCODE_TEX, dst0, coord);
inst->sampler = samplerIndex;
inst->tex_target = TEXTURE_2D_INDEX;
prog->InputsRead |= FRAG_BIT_TEX0;
prog->SamplersUsed |= (1 << samplerIndex); /* mark sampler as used */
v->samplers_used |= (1 << samplerIndex);
/* KIL if -tmp0 < 0 # texel=0 -> keep / texel=0 -> discard */
src0.negate = NEGATE_XYZW;
if (st->bitmap.tex_format == PIPE_FORMAT_L8_UNORM)
src0.swizzle = SWIZZLE_XXXX;
inst = v->emit(NULL, TGSI_OPCODE_KIL, undef_dst, src0);
/* Now copy the instructions from the original glsl_to_tgsi_visitor into the
* new visitor. */
foreach_iter(exec_list_iterator, iter, original->instructions) {
glsl_to_tgsi_instruction *inst = (glsl_to_tgsi_instruction *)iter.get();
glsl_to_tgsi_instruction *newinst;
st_src_reg src_regs[3];
if (inst->dst.file == PROGRAM_OUTPUT)
prog->OutputsWritten |= BITFIELD64_BIT(inst->dst.index);
for (int i=0; i<3; i++) {
src_regs[i] = inst->src[i];
if (src_regs[i].file == PROGRAM_INPUT)
prog->InputsRead |= BITFIELD64_BIT(src_regs[i].index);
}
newinst = v->emit(NULL, inst->op, inst->dst, src_regs[0], src_regs[1], src_regs[2]);
newinst->tex_target = inst->tex_target;
}
/* Make modifications to fragment program info. */
prog->Parameters = _mesa_clone_parameter_list(original->prog->Parameters);
count_resources(v, prog);
fp->glsl_to_tgsi = v;
}
/* ------------------------- TGSI conversion stuff -------------------------- */
struct label {
unsigned branch_target;
unsigned token;
};
/**
* Intermediate state used during shader translation.
*/
struct st_translate {
struct ureg_program *ureg;
struct ureg_dst temps[MAX_TEMPS];
struct ureg_src *constants;
struct ureg_src *immediates;
struct ureg_dst outputs[PIPE_MAX_SHADER_OUTPUTS];
struct ureg_src inputs[PIPE_MAX_SHADER_INPUTS];
struct ureg_dst address[1];
struct ureg_src samplers[PIPE_MAX_SAMPLERS];
struct ureg_src systemValues[SYSTEM_VALUE_MAX];
const GLuint *inputMapping;
const GLuint *outputMapping;
/* For every instruction that contains a label (eg CALL), keep
* details so that we can go back afterwards and emit the correct
* tgsi instruction number for each label.
*/
struct label *labels;
unsigned labels_size;
unsigned labels_count;
/* Keep a record of the tgsi instruction number that each mesa
* instruction starts at, will be used to fix up labels after
* translation.
*/
unsigned *insn;
unsigned insn_size;
unsigned insn_count;
unsigned procType; /**< TGSI_PROCESSOR_VERTEX/FRAGMENT */
boolean error;
};
/** Map Mesa's SYSTEM_VALUE_x to TGSI_SEMANTIC_x */
static unsigned mesa_sysval_to_semantic[SYSTEM_VALUE_MAX] = {
TGSI_SEMANTIC_FACE,
TGSI_SEMANTIC_VERTEXID,
TGSI_SEMANTIC_INSTANCEID
};
/**
* Make note of a branch to a label in the TGSI code.
* After we've emitted all instructions, we'll go over the list
* of labels built here and patch the TGSI code with the actual
* location of each label.
*/
static unsigned *get_label(struct st_translate *t, unsigned branch_target)
{
unsigned i;
if (t->labels_count + 1 >= t->labels_size) {
t->labels_size = 1 << (util_logbase2(t->labels_size) + 1);
t->labels = (struct label *)realloc(t->labels,
t->labels_size * sizeof(struct label));
if (t->labels == NULL) {
static unsigned dummy;
t->error = TRUE;
return &dummy;
}
}
i = t->labels_count++;
t->labels[i].branch_target = branch_target;
return &t->labels[i].token;
}
/**
* Called prior to emitting the TGSI code for each instruction.
* Allocate additional space for instructions if needed.
* Update the insn[] array so the next glsl_to_tgsi_instruction points to
* the next TGSI instruction.
*/
static void set_insn_start(struct st_translate *t, unsigned start)
{
if (t->insn_count + 1 >= t->insn_size) {
t->insn_size = 1 << (util_logbase2(t->insn_size) + 1);
t->insn = (unsigned *)realloc(t->insn, t->insn_size * sizeof(t->insn[0]));
if (t->insn == NULL) {
t->error = TRUE;
return;
}
}
t->insn[t->insn_count++] = start;
}
/**
* Map a glsl_to_tgsi constant/immediate to a TGSI immediate.
*/
static struct ureg_src
emit_immediate(struct st_translate *t,
gl_constant_value values[4],
int type, int size)
{
struct ureg_program *ureg = t->ureg;
switch(type)
{
case GL_FLOAT:
return ureg_DECL_immediate(ureg, &values[0].f, size);
case GL_INT:
return ureg_DECL_immediate_int(ureg, &values[0].i, size);
case GL_UNSIGNED_INT:
case GL_BOOL:
return ureg_DECL_immediate_uint(ureg, &values[0].u, size);
default:
assert(!"should not get here - type must be float, int, uint, or bool");
return ureg_src_undef();
}
}
/**
* Map a glsl_to_tgsi dst register to a TGSI ureg_dst register.
*/
static struct ureg_dst
dst_register(struct st_translate *t,
gl_register_file file,
GLuint index)
{
switch(file) {
case PROGRAM_UNDEFINED:
return ureg_dst_undef();
case PROGRAM_TEMPORARY:
if (ureg_dst_is_undef(t->temps[index]))
t->temps[index] = ureg_DECL_local_temporary(t->ureg);
return t->temps[index];
case PROGRAM_OUTPUT:
if (t->procType == TGSI_PROCESSOR_VERTEX)
assert(index < VERT_RESULT_MAX);
else if (t->procType == TGSI_PROCESSOR_FRAGMENT)
assert(index < FRAG_RESULT_MAX);
else
assert(index < GEOM_RESULT_MAX);
assert(t->outputMapping[index] < Elements(t->outputs));
return t->outputs[t->outputMapping[index]];
case PROGRAM_ADDRESS:
return t->address[index];
default:
assert(!"unknown dst register file");
return ureg_dst_undef();
}
}
/**
* Map a glsl_to_tgsi src register to a TGSI ureg_src register.
*/
static struct ureg_src
src_register(struct st_translate *t,
gl_register_file file,
GLint index)
{
switch(file) {
case PROGRAM_UNDEFINED:
return ureg_src_undef();
case PROGRAM_TEMPORARY:
assert(index >= 0);
assert(index < (int) Elements(t->temps));
if (ureg_dst_is_undef(t->temps[index]))
t->temps[index] = ureg_DECL_local_temporary(t->ureg);
return ureg_src(t->temps[index]);
case PROGRAM_NAMED_PARAM:
case PROGRAM_ENV_PARAM:
case PROGRAM_LOCAL_PARAM:
case PROGRAM_UNIFORM:
assert(index >= 0);
return t->constants[index];
case PROGRAM_STATE_VAR:
case PROGRAM_CONSTANT: /* ie, immediate */
if (index < 0)
return ureg_DECL_constant(t->ureg, 0);
else
return t->constants[index];
case PROGRAM_IMMEDIATE:
return t->immediates[index];
case PROGRAM_INPUT:
assert(t->inputMapping[index] < Elements(t->inputs));
return t->inputs[t->inputMapping[index]];
case PROGRAM_OUTPUT:
assert(t->outputMapping[index] < Elements(t->outputs));
return ureg_src(t->outputs[t->outputMapping[index]]); /* not needed? */
case PROGRAM_ADDRESS:
return ureg_src(t->address[index]);
case PROGRAM_SYSTEM_VALUE:
assert(index < (int) Elements(t->systemValues));
return t->systemValues[index];
default:
assert(!"unknown src register file");
return ureg_src_undef();
}
}
/**
* Create a TGSI ureg_dst register from an st_dst_reg.
*/
static struct ureg_dst
translate_dst(struct st_translate *t,
const st_dst_reg *dst_reg,
bool saturate, bool clamp_color)
{
struct ureg_dst dst = dst_register(t,
dst_reg->file,
dst_reg->index);
dst = ureg_writemask(dst, dst_reg->writemask);
if (saturate)
dst = ureg_saturate(dst);
else if (clamp_color && dst_reg->file == PROGRAM_OUTPUT) {
/* Clamp colors for ARB_color_buffer_float. */
switch (t->procType) {
case TGSI_PROCESSOR_VERTEX:
/* XXX if the geometry shader is present, this must be done there
* instead of here. */
if (dst_reg->index == VERT_RESULT_COL0 ||
dst_reg->index == VERT_RESULT_COL1 ||
dst_reg->index == VERT_RESULT_BFC0 ||
dst_reg->index == VERT_RESULT_BFC1) {
dst = ureg_saturate(dst);
}
break;
case TGSI_PROCESSOR_FRAGMENT:
if (dst_reg->index >= FRAG_RESULT_COLOR) {
dst = ureg_saturate(dst);
}
break;
}
}
if (dst_reg->reladdr != NULL)
dst = ureg_dst_indirect(dst, ureg_src(t->address[0]));
return dst;
}
/**
* Create a TGSI ureg_src register from an st_src_reg.
*/
static struct ureg_src
translate_src(struct st_translate *t, const st_src_reg *src_reg)
{
struct ureg_src src = src_register(t, src_reg->file, src_reg->index);
src = ureg_swizzle(src,
GET_SWZ(src_reg->swizzle, 0) & 0x3,
GET_SWZ(src_reg->swizzle, 1) & 0x3,
GET_SWZ(src_reg->swizzle, 2) & 0x3,
GET_SWZ(src_reg->swizzle, 3) & 0x3);
if ((src_reg->negate & 0xf) == NEGATE_XYZW)
src = ureg_negate(src);
if (src_reg->reladdr != NULL) {
/* Normally ureg_src_indirect() would be used here, but a stupid compiler
* bug in g++ makes ureg_src_indirect (an inline C function) erroneously
* set the bit for src.Negate. So we have to do the operation manually
* here to work around the compiler's problems. */
/*src = ureg_src_indirect(src, ureg_src(t->address[0]));*/
struct ureg_src addr = ureg_src(t->address[0]);
src.Indirect = 1;
src.IndirectFile = addr.File;
src.IndirectIndex = addr.Index;
src.IndirectSwizzle = addr.SwizzleX;
if (src_reg->file != PROGRAM_INPUT &&
src_reg->file != PROGRAM_OUTPUT) {
/* If src_reg->index was negative, it was set to zero in
* src_register(). Reassign it now. But don't do this
* for input/output regs since they get remapped while
* const buffers don't.
*/
src.Index = src_reg->index;
}
}
return src;
}
static struct tgsi_texture_offset
translate_tex_offset(struct st_translate *t,
const struct tgsi_texture_offset *in_offset)
{
struct tgsi_texture_offset offset;
assert(in_offset->File == PROGRAM_IMMEDIATE);
offset.File = TGSI_FILE_IMMEDIATE;
offset.Index = in_offset->Index;
offset.SwizzleX = in_offset->SwizzleX;
offset.SwizzleY = in_offset->SwizzleY;
offset.SwizzleZ = in_offset->SwizzleZ;
offset.Padding = 0;
return offset;
}
static void
compile_tgsi_instruction(struct st_translate *t,
const glsl_to_tgsi_instruction *inst,
bool clamp_dst_color_output)
{
struct ureg_program *ureg = t->ureg;
GLuint i;
struct ureg_dst dst[1];
struct ureg_src src[4];
struct tgsi_texture_offset texoffsets[MAX_GLSL_TEXTURE_OFFSET];
unsigned num_dst;
unsigned num_src;
num_dst = num_inst_dst_regs(inst->op);
num_src = num_inst_src_regs(inst->op);
if (num_dst)
dst[0] = translate_dst(t,
&inst->dst,
inst->saturate,
clamp_dst_color_output);
for (i = 0; i < num_src; i++)
src[i] = translate_src(t, &inst->src[i]);
switch(inst->op) {
case TGSI_OPCODE_BGNLOOP:
case TGSI_OPCODE_CAL:
case TGSI_OPCODE_ELSE:
case TGSI_OPCODE_ENDLOOP:
case TGSI_OPCODE_IF:
assert(num_dst == 0);
ureg_label_insn(ureg,
inst->op,
src, num_src,
get_label(t,
inst->op == TGSI_OPCODE_CAL ? inst->function->sig_id : 0));
return;
case TGSI_OPCODE_TEX:
case TGSI_OPCODE_TXB:
case TGSI_OPCODE_TXD:
case TGSI_OPCODE_TXL:
case TGSI_OPCODE_TXP:
case TGSI_OPCODE_TXQ:
case TGSI_OPCODE_TXF:
src[num_src++] = t->samplers[inst->sampler];
for (i = 0; i < inst->tex_offset_num_offset; i++) {
texoffsets[i] = translate_tex_offset(t, &inst->tex_offsets[i]);
}
ureg_tex_insn(ureg,
inst->op,
dst, num_dst,
st_translate_texture_target(inst->tex_target, inst->tex_shadow),
texoffsets, inst->tex_offset_num_offset,
src, num_src);
return;
case TGSI_OPCODE_SCS:
dst[0] = ureg_writemask(dst[0], TGSI_WRITEMASK_XY);
ureg_insn(ureg, inst->op, dst, num_dst, src, num_src);
break;
default:
ureg_insn(ureg,
inst->op,
dst, num_dst,
src, num_src);
break;
}
}
/**
* Emit the TGSI instructions for inverting and adjusting WPOS.
* This code is unavoidable because it also depends on whether
* a FBO is bound (STATE_FB_WPOS_Y_TRANSFORM).
*/
static void
emit_wpos_adjustment( struct st_translate *t,
const struct gl_program *program,
boolean invert,
GLfloat adjX, GLfloat adjY[2])
{
struct ureg_program *ureg = t->ureg;
/* Fragment program uses fragment position input.
* Need to replace instances of INPUT[WPOS] with temp T
* where T = INPUT[WPOS] by y is inverted.
*/
static const gl_state_index wposTransformState[STATE_LENGTH]
= { STATE_INTERNAL, STATE_FB_WPOS_Y_TRANSFORM,
(gl_state_index)0, (gl_state_index)0, (gl_state_index)0 };
/* XXX: note we are modifying the incoming shader here! Need to
* do this before emitting the constant decls below, or this
* will be missed:
*/
unsigned wposTransConst = _mesa_add_state_reference(program->Parameters,
wposTransformState);
struct ureg_src wpostrans = ureg_DECL_constant( ureg, wposTransConst );
struct ureg_dst wpos_temp = ureg_DECL_temporary( ureg );
struct ureg_src wpos_input = t->inputs[t->inputMapping[FRAG_ATTRIB_WPOS]];
/* First, apply the coordinate shift: */
if (adjX || adjY[0] || adjY[1]) {
if (adjY[0] != adjY[1]) {
/* Adjust the y coordinate by adjY[1] or adjY[0] respectively
* depending on whether inversion is actually going to be applied
* or not, which is determined by testing against the inversion
* state variable used below, which will be either +1 or -1.
*/
struct ureg_dst adj_temp = ureg_DECL_local_temporary(ureg);
ureg_CMP(ureg, adj_temp,
ureg_scalar(wpostrans, invert ? 2 : 0),
ureg_imm4f(ureg, adjX, adjY[0], 0.0f, 0.0f),
ureg_imm4f(ureg, adjX, adjY[1], 0.0f, 0.0f));
ureg_ADD(ureg, wpos_temp, wpos_input, ureg_src(adj_temp));
} else {
ureg_ADD(ureg, wpos_temp, wpos_input,
ureg_imm4f(ureg, adjX, adjY[0], 0.0f, 0.0f));
}
wpos_input = ureg_src(wpos_temp);
} else {
/* MOV wpos_temp, input[wpos]
*/
ureg_MOV( ureg, wpos_temp, wpos_input );
}
/* Now the conditional y flip: STATE_FB_WPOS_Y_TRANSFORM.xy/zw will be
* inversion/identity, or the other way around if we're drawing to an FBO.
*/
if (invert) {
/* MAD wpos_temp.y, wpos_input, wpostrans.xxxx, wpostrans.yyyy
*/
ureg_MAD( ureg,
ureg_writemask(wpos_temp, TGSI_WRITEMASK_Y ),
wpos_input,
ureg_scalar(wpostrans, 0),
ureg_scalar(wpostrans, 1));
} else {
/* MAD wpos_temp.y, wpos_input, wpostrans.zzzz, wpostrans.wwww
*/
ureg_MAD( ureg,
ureg_writemask(wpos_temp, TGSI_WRITEMASK_Y ),
wpos_input,
ureg_scalar(wpostrans, 2),
ureg_scalar(wpostrans, 3));
}
/* Use wpos_temp as position input from here on:
*/
t->inputs[t->inputMapping[FRAG_ATTRIB_WPOS]] = ureg_src(wpos_temp);
}
/**
* Emit fragment position/ooordinate code.
*/
static void
emit_wpos(struct st_context *st,
struct st_translate *t,
const struct gl_program *program,
struct ureg_program *ureg)
{
const struct gl_fragment_program *fp =
(const struct gl_fragment_program *) program;
struct pipe_screen *pscreen = st->pipe->screen;
GLfloat adjX = 0.0f;
GLfloat adjY[2] = { 0.0f, 0.0f };
boolean invert = FALSE;
/* Query the pixel center conventions supported by the pipe driver and set
* adjX, adjY to help out if it cannot handle the requested one internally.
*
* The bias of the y-coordinate depends on whether y-inversion takes place
* (adjY[1]) or not (adjY[0]), which is in turn dependent on whether we are
* drawing to an FBO (causes additional inversion), and whether the the pipe
* driver origin and the requested origin differ (the latter condition is
* stored in the 'invert' variable).
*
* For height = 100 (i = integer, h = half-integer, l = lower, u = upper):
*
* center shift only:
* i -> h: +0.5
* h -> i: -0.5
*
* inversion only:
* l,i -> u,i: ( 0.0 + 1.0) * -1 + 100 = 99
* l,h -> u,h: ( 0.5 + 0.0) * -1 + 100 = 99.5
* u,i -> l,i: (99.0 + 1.0) * -1 + 100 = 0
* u,h -> l,h: (99.5 + 0.0) * -1 + 100 = 0.5
*
* inversion and center shift:
* l,i -> u,h: ( 0.0 + 0.5) * -1 + 100 = 99.5
* l,h -> u,i: ( 0.5 + 0.5) * -1 + 100 = 99
* u,i -> l,h: (99.0 + 0.5) * -1 + 100 = 0.5
* u,h -> l,i: (99.5 + 0.5) * -1 + 100 = 0
*/
if (fp->OriginUpperLeft) {
/* Fragment shader wants origin in upper-left */
if (pscreen->get_param(pscreen, PIPE_CAP_TGSI_FS_COORD_ORIGIN_UPPER_LEFT)) {
/* the driver supports upper-left origin */
}
else if (pscreen->get_param(pscreen, PIPE_CAP_TGSI_FS_COORD_ORIGIN_LOWER_LEFT)) {
/* the driver supports lower-left origin, need to invert Y */
ureg_property_fs_coord_origin(ureg, TGSI_FS_COORD_ORIGIN_LOWER_LEFT);
invert = TRUE;
}
else
assert(0);
}
else {
/* Fragment shader wants origin in lower-left */
if (pscreen->get_param(pscreen, PIPE_CAP_TGSI_FS_COORD_ORIGIN_LOWER_LEFT))
/* the driver supports lower-left origin */
ureg_property_fs_coord_origin(ureg, TGSI_FS_COORD_ORIGIN_LOWER_LEFT);
else if (pscreen->get_param(pscreen, PIPE_CAP_TGSI_FS_COORD_ORIGIN_UPPER_LEFT))
/* the driver supports upper-left origin, need to invert Y */
invert = TRUE;
else
assert(0);
}
if (fp->PixelCenterInteger) {
/* Fragment shader wants pixel center integer */
if (pscreen->get_param(pscreen, PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_INTEGER)) {
/* the driver supports pixel center integer */
adjY[1] = 1.0f;
ureg_property_fs_coord_pixel_center(ureg, TGSI_FS_COORD_PIXEL_CENTER_INTEGER);
}
else if (pscreen->get_param(pscreen, PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_HALF_INTEGER)) {
/* the driver supports pixel center half integer, need to bias X,Y */
adjX = -0.5f;
adjY[0] = -0.5f;
adjY[1] = 0.5f;
}
else
assert(0);
}
else {
/* Fragment shader wants pixel center half integer */
if (pscreen->get_param(pscreen, PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_HALF_INTEGER)) {
/* the driver supports pixel center half integer */
}
else if (pscreen->get_param(pscreen, PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_INTEGER)) {
/* the driver supports pixel center integer, need to bias X,Y */
adjX = adjY[0] = adjY[1] = 0.5f;
ureg_property_fs_coord_pixel_center(ureg, TGSI_FS_COORD_PIXEL_CENTER_INTEGER);
}
else
assert(0);
}
/* we invert after adjustment so that we avoid the MOV to temporary,
* and reuse the adjustment ADD instead */
emit_wpos_adjustment(t, program, invert, adjX, adjY);
}
/**
* OpenGL's fragment gl_FrontFace input is 1 for front-facing, 0 for back.
* TGSI uses +1 for front, -1 for back.
* This function converts the TGSI value to the GL value. Simply clamping/
* saturating the value to [0,1] does the job.
*/
static void
emit_face_var(struct st_translate *t)
{
struct ureg_program *ureg = t->ureg;
struct ureg_dst face_temp = ureg_DECL_temporary(ureg);
struct ureg_src face_input = t->inputs[t->inputMapping[FRAG_ATTRIB_FACE]];
/* MOV_SAT face_temp, input[face] */
face_temp = ureg_saturate(face_temp);
ureg_MOV(ureg, face_temp, face_input);
/* Use face_temp as face input from here on: */
t->inputs[t->inputMapping[FRAG_ATTRIB_FACE]] = ureg_src(face_temp);
}
static void
emit_edgeflags(struct st_translate *t)
{
struct ureg_program *ureg = t->ureg;
struct ureg_dst edge_dst = t->outputs[t->outputMapping[VERT_RESULT_EDGE]];
struct ureg_src edge_src = t->inputs[t->inputMapping[VERT_ATTRIB_EDGEFLAG]];
ureg_MOV(ureg, edge_dst, edge_src);
}
/**
* Translate intermediate IR (glsl_to_tgsi_instruction) to TGSI format.
* \param program the program to translate
* \param numInputs number of input registers used
* \param inputMapping maps Mesa fragment program inputs to TGSI generic
* input indexes
* \param inputSemanticName the TGSI_SEMANTIC flag for each input
* \param inputSemanticIndex the semantic index (ex: which texcoord) for
* each input
* \param interpMode the TGSI_INTERPOLATE_LINEAR/PERSP mode for each input
* \param numOutputs number of output registers used
* \param outputMapping maps Mesa fragment program outputs to TGSI
* generic outputs
* \param outputSemanticName the TGSI_SEMANTIC flag for each output
* \param outputSemanticIndex the semantic index (ex: which texcoord) for
* each output
*
* \return PIPE_OK or PIPE_ERROR_OUT_OF_MEMORY
*/
extern "C" enum pipe_error
st_translate_program(
struct gl_context *ctx,
uint procType,
struct ureg_program *ureg,
glsl_to_tgsi_visitor *program,
const struct gl_program *proginfo,
GLuint numInputs,
const GLuint inputMapping[],
const ubyte inputSemanticName[],
const ubyte inputSemanticIndex[],
const GLuint interpMode[],
const GLboolean is_centroid[],
GLuint numOutputs,
const GLuint outputMapping[],
const ubyte outputSemanticName[],
const ubyte outputSemanticIndex[],
boolean passthrough_edgeflags,
boolean clamp_color)
{
struct st_translate *t;
unsigned i;
enum pipe_error ret = PIPE_OK;
assert(numInputs <= Elements(t->inputs));
assert(numOutputs <= Elements(t->outputs));
t = CALLOC_STRUCT(st_translate);
if (!t) {
ret = PIPE_ERROR_OUT_OF_MEMORY;
goto out;
}
memset(t, 0, sizeof *t);
t->procType = procType;
t->inputMapping = inputMapping;
t->outputMapping = outputMapping;
t->ureg = ureg;
if (program->shader_program) {
for (i = 0; i < program->shader_program->NumUserUniformStorage; i++) {
struct gl_uniform_storage *const storage =
&program->shader_program->UniformStorage[i];
_mesa_uniform_detach_all_driver_storage(storage);
}
}
/*
* Declare input attributes.
*/
if (procType == TGSI_PROCESSOR_FRAGMENT) {
for (i = 0; i < numInputs; i++) {
t->inputs[i] = ureg_DECL_fs_input_cyl_centroid(ureg,
inputSemanticName[i],
inputSemanticIndex[i],
interpMode[i], 0,
is_centroid[i]);
}
if (proginfo->InputsRead & FRAG_BIT_WPOS) {
/* Must do this after setting up t->inputs, and before
* emitting constant references, below:
*/
emit_wpos(st_context(ctx), t, proginfo, ureg);
}
if (proginfo->InputsRead & FRAG_BIT_FACE)
emit_face_var(t);
/*
* Declare output attributes.
*/
for (i = 0; i < numOutputs; i++) {
switch (outputSemanticName[i]) {
case TGSI_SEMANTIC_POSITION:
t->outputs[i] = ureg_DECL_output(ureg,
TGSI_SEMANTIC_POSITION, /* Z/Depth */
outputSemanticIndex[i]);
t->outputs[i] = ureg_writemask(t->outputs[i], TGSI_WRITEMASK_Z);
break;
case TGSI_SEMANTIC_STENCIL:
t->outputs[i] = ureg_DECL_output(ureg,
TGSI_SEMANTIC_STENCIL, /* Stencil */
outputSemanticIndex[i]);
t->outputs[i] = ureg_writemask(t->outputs[i], TGSI_WRITEMASK_Y);
break;
case TGSI_SEMANTIC_COLOR:
t->outputs[i] = ureg_DECL_output(ureg,
TGSI_SEMANTIC_COLOR,
outputSemanticIndex[i]);
break;
default:
assert(!"fragment shader outputs must be POSITION/STENCIL/COLOR");
ret = PIPE_ERROR_BAD_INPUT;
goto out;
}
}
}
else if (procType == TGSI_PROCESSOR_GEOMETRY) {
for (i = 0; i < numInputs; i++) {
t->inputs[i] = ureg_DECL_gs_input(ureg,
i,
inputSemanticName[i],
inputSemanticIndex[i]);
}
for (i = 0; i < numOutputs; i++) {
t->outputs[i] = ureg_DECL_output(ureg,
outputSemanticName[i],
outputSemanticIndex[i]);
}
}
else {
assert(procType == TGSI_PROCESSOR_VERTEX);
for (i = 0; i < numInputs; i++) {
t->inputs[i] = ureg_DECL_vs_input(ureg, i);
}
for (i = 0; i < numOutputs; i++) {
t->outputs[i] = ureg_DECL_output(ureg,
outputSemanticName[i],
outputSemanticIndex[i]);
}
if (passthrough_edgeflags)
emit_edgeflags(t);
}
/* Declare address register.
*/
if (program->num_address_regs > 0) {
assert(program->num_address_regs == 1);
t->address[0] = ureg_DECL_address(ureg);
}
/* Declare misc input registers
*/
{
GLbitfield sysInputs = proginfo->SystemValuesRead;
unsigned numSys = 0;
for (i = 0; sysInputs; i++) {
if (sysInputs & (1 << i)) {
unsigned semName = mesa_sysval_to_semantic[i];
t->systemValues[i] = ureg_DECL_system_value(ureg, numSys, semName, 0);
if (semName == TGSI_SEMANTIC_INSTANCEID ||
semName == TGSI_SEMANTIC_VERTEXID) {
/* From Gallium perspective, these system values are always
* integer, and require native integer support. However, if
* native integer is supported on the vertex stage but not the
* pixel stage (e.g, i915g + draw), Mesa will generate IR that
* assumes these system values are floats. To resolve the
* inconsistency, we insert a U2F.
*/
struct st_context *st = st_context(ctx);
struct pipe_screen *pscreen = st->pipe->screen;
assert(procType == TGSI_PROCESSOR_VERTEX);
assert(pscreen->get_shader_param(pscreen, PIPE_SHADER_VERTEX, PIPE_SHADER_CAP_INTEGERS));
if (!ctx->Const.NativeIntegers) {
struct ureg_dst temp = ureg_DECL_local_temporary(t->ureg);
ureg_U2F( t->ureg, ureg_writemask(temp, TGSI_WRITEMASK_X), t->systemValues[i]);
t->systemValues[i] = ureg_scalar(ureg_src(temp), 0);
}
}
numSys++;
sysInputs &= ~(1 << i);
}
}
}
if (program->indirect_addr_temps) {
/* If temps are accessed with indirect addressing, declare temporaries
* in sequential order. Else, we declare them on demand elsewhere.
* (Note: the number of temporaries is equal to program->next_temp)
*/
for (i = 0; i < (unsigned)program->next_temp; i++) {
/* XXX use TGSI_FILE_TEMPORARY_ARRAY when it's supported by ureg */
t->temps[i] = ureg_DECL_local_temporary(t->ureg);
}
}
/* Emit constants and uniforms. TGSI uses a single index space for these,
* so we put all the translated regs in t->constants.
*/
if (proginfo->Parameters) {
t->constants = (struct ureg_src *)CALLOC(proginfo->Parameters->NumParameters * sizeof(t->constants[0]));
if (t->constants == NULL) {
ret = PIPE_ERROR_OUT_OF_MEMORY;
goto out;
}
for (i = 0; i < proginfo->Parameters->NumParameters; i++) {
switch (proginfo->Parameters->Parameters[i].Type) {
case PROGRAM_ENV_PARAM:
case PROGRAM_LOCAL_PARAM:
case PROGRAM_STATE_VAR:
case PROGRAM_NAMED_PARAM:
case PROGRAM_UNIFORM:
t->constants[i] = ureg_DECL_constant(ureg, i);
break;
/* Emit immediates for PROGRAM_CONSTANT only when there's no indirect
* addressing of the const buffer.
* FIXME: Be smarter and recognize param arrays:
* indirect addressing is only valid within the referenced
* array.
*/
case PROGRAM_CONSTANT:
if (program->indirect_addr_consts)
t->constants[i] = ureg_DECL_constant(ureg, i);
else
t->constants[i] = emit_immediate(t,
proginfo->Parameters->ParameterValues[i],
proginfo->Parameters->Parameters[i].DataType,
4);
break;
default:
break;
}
}
}
/* Emit immediate values.
*/
t->immediates = (struct ureg_src *)CALLOC(program->num_immediates * sizeof(struct ureg_src));
if (t->immediates == NULL) {
ret = PIPE_ERROR_OUT_OF_MEMORY;
goto out;
}
i = 0;
foreach_iter(exec_list_iterator, iter, program->immediates) {
immediate_storage *imm = (immediate_storage *)iter.get();
assert(i < program->num_immediates);
t->immediates[i++] = emit_immediate(t, imm->values, imm->type, imm->size);
}
assert(i == program->num_immediates);
/* texture samplers */
for (i = 0; i < ctx->Const.MaxTextureImageUnits; i++) {
if (program->samplers_used & (1 << i)) {
t->samplers[i] = ureg_DECL_sampler(ureg, i);
}
}
/* Emit each instruction in turn:
*/
foreach_iter(exec_list_iterator, iter, program->instructions) {
set_insn_start(t, ureg_get_instruction_number(ureg));
compile_tgsi_instruction(t, (glsl_to_tgsi_instruction *)iter.get(),
clamp_color);
}
/* Fix up all emitted labels:
*/
for (i = 0; i < t->labels_count; i++) {
ureg_fixup_label(ureg, t->labels[i].token,
t->insn[t->labels[i].branch_target]);
}
if (program->shader_program) {
/* This has to be done last. Any operation the can cause
* prog->ParameterValues to get reallocated (e.g., anything that adds a
* program constant) has to happen before creating this linkage.
*/
for (unsigned i = 0; i < MESA_SHADER_TYPES; i++) {
if (program->shader_program->_LinkedShaders[i] == NULL)
continue;
_mesa_associate_uniform_storage(ctx, program->shader_program,
program->shader_program->_LinkedShaders[i]->Program->Parameters);
}
}
out:
if (t) {
FREE(t->insn);
FREE(t->labels);
FREE(t->constants);
FREE(t->immediates);
if (t->error) {
debug_printf("%s: translate error flag set\n", __FUNCTION__);
}
FREE(t);
}
return ret;
}
/* ----------------------------- End TGSI code ------------------------------ */
/**
* Convert a shader's GLSL IR into a Mesa gl_program, although without
* generating Mesa IR.
*/
static struct gl_program *
get_mesa_program(struct gl_context *ctx,
struct gl_shader_program *shader_program,
struct gl_shader *shader)
{
glsl_to_tgsi_visitor* v;
struct gl_program *prog;
GLenum target;
const char *target_string;
bool progress;
struct gl_shader_compiler_options *options =
&ctx->ShaderCompilerOptions[_mesa_shader_type_to_index(shader->Type)];
switch (shader->Type) {
case GL_VERTEX_SHADER:
target = GL_VERTEX_PROGRAM_ARB;
target_string = "vertex";
break;
case GL_FRAGMENT_SHADER:
target = GL_FRAGMENT_PROGRAM_ARB;
target_string = "fragment";
break;
case GL_GEOMETRY_SHADER:
target = GL_GEOMETRY_PROGRAM_NV;
target_string = "geometry";
break;
default:
assert(!"should not be reached");
return NULL;
}
validate_ir_tree(shader->ir);
prog = ctx->Driver.NewProgram(ctx, target, shader_program->Name);
if (!prog)
return NULL;
prog->Parameters = _mesa_new_parameter_list();
v = new glsl_to_tgsi_visitor();
v->ctx = ctx;
v->prog = prog;
v->shader_program = shader_program;
v->options = options;
v->glsl_version = ctx->Const.GLSLVersion;
v->native_integers = ctx->Const.NativeIntegers;
_mesa_generate_parameters_list_for_uniforms(shader_program, shader,
prog->Parameters);
/* Remove reads from output registers. */
lower_output_reads(shader->ir);
/* Emit intermediate IR for main(). */
visit_exec_list(shader->ir, v);
/* Now emit bodies for any functions that were used. */
do {
progress = GL_FALSE;
foreach_iter(exec_list_iterator, iter, v->function_signatures) {
function_entry *entry = (function_entry *)iter.get();
if (!entry->bgn_inst) {
v->current_function = entry;
entry->bgn_inst = v->emit(NULL, TGSI_OPCODE_BGNSUB);
entry->bgn_inst->function = entry;
visit_exec_list(&entry->sig->body, v);
glsl_to_tgsi_instruction *last;
last = (glsl_to_tgsi_instruction *)v->instructions.get_tail();
if (last->op != TGSI_OPCODE_RET)
v->emit(NULL, TGSI_OPCODE_RET);
glsl_to_tgsi_instruction *end;
end = v->emit(NULL, TGSI_OPCODE_ENDSUB);
end->function = entry;
progress = GL_TRUE;
}
}
} while (progress);
#if 0
/* Print out some information (for debugging purposes) used by the
* optimization passes. */
for (i=0; i < v->next_temp; i++) {
int fr = v->get_first_temp_read(i);
int fw = v->get_first_temp_write(i);
int lr = v->get_last_temp_read(i);
int lw = v->get_last_temp_write(i);
printf("Temp %d: FR=%3d FW=%3d LR=%3d LW=%3d\n", i, fr, fw, lr, lw);
assert(fw <= fr);
}
#endif
/* Perform optimizations on the instructions in the glsl_to_tgsi_visitor. */
v->simplify_cmp();
v->copy_propagate();
while (v->eliminate_dead_code_advanced());
/* FIXME: These passes to optimize temporary registers don't work when there
* is indirect addressing of the temporary register space. We need proper
* array support so that we don't have to give up these passes in every
* shader that uses arrays.
*/
if (!v->indirect_addr_temps) {
v->eliminate_dead_code();
v->merge_registers();
v->renumber_registers();
}
/* Write the END instruction. */
v->emit(NULL, TGSI_OPCODE_END);
if (ctx->Shader.Flags & GLSL_DUMP) {
printf("\n");
printf("GLSL IR for linked %s program %d:\n", target_string,
shader_program->Name);
_mesa_print_ir(shader->ir, NULL);
printf("\n");
printf("\n");
fflush(stdout);
}
prog->Instructions = NULL;
prog->NumInstructions = 0;
do_set_program_inouts(shader->ir, prog, shader->Type == GL_FRAGMENT_SHADER);
count_resources(v, prog);
_mesa_reference_program(ctx, &shader->Program, prog);
/* This has to be done last. Any operation the can cause
* prog->ParameterValues to get reallocated (e.g., anything that adds a
* program constant) has to happen before creating this linkage.
*/
_mesa_associate_uniform_storage(ctx, shader_program, prog->Parameters);
if (!shader_program->LinkStatus) {
return NULL;
}
struct st_vertex_program *stvp;
struct st_fragment_program *stfp;
struct st_geometry_program *stgp;
switch (shader->Type) {
case GL_VERTEX_SHADER:
stvp = (struct st_vertex_program *)prog;
stvp->glsl_to_tgsi = v;
break;
case GL_FRAGMENT_SHADER:
stfp = (struct st_fragment_program *)prog;
stfp->glsl_to_tgsi = v;
break;
case GL_GEOMETRY_SHADER:
stgp = (struct st_geometry_program *)prog;
stgp->glsl_to_tgsi = v;
break;
default:
assert(!"should not be reached");
return NULL;
}
return prog;
}
extern "C" {
struct gl_shader *
st_new_shader(struct gl_context *ctx, GLuint name, GLuint type)
{
struct gl_shader *shader;
assert(type == GL_FRAGMENT_SHADER || type == GL_VERTEX_SHADER ||
type == GL_GEOMETRY_SHADER_ARB);
shader = rzalloc(NULL, struct gl_shader);
if (shader) {
shader->Type = type;
shader->Name = name;
_mesa_init_shader(ctx, shader);
}
return shader;
}
struct gl_shader_program *
st_new_shader_program(struct gl_context *ctx, GLuint name)
{
struct gl_shader_program *shProg;
shProg = rzalloc(NULL, struct gl_shader_program);
if (shProg) {
shProg->Name = name;
_mesa_init_shader_program(ctx, shProg);
}
return shProg;
}
/**
* Link a shader.
* Called via ctx->Driver.LinkShader()
* This actually involves converting GLSL IR into an intermediate TGSI-like IR
* with code lowering and other optimizations.
*/
GLboolean
st_link_shader(struct gl_context *ctx, struct gl_shader_program *prog)
{
assert(prog->LinkStatus);
for (unsigned i = 0; i < MESA_SHADER_TYPES; i++) {
if (prog->_LinkedShaders[i] == NULL)
continue;
bool progress;
exec_list *ir = prog->_LinkedShaders[i]->ir;
const struct gl_shader_compiler_options *options =
&ctx->ShaderCompilerOptions[_mesa_shader_type_to_index(prog->_LinkedShaders[i]->Type)];
do {
unsigned what_to_lower = MOD_TO_FRACT | DIV_TO_MUL_RCP |
EXP_TO_EXP2 | LOG_TO_LOG2;
if (options->EmitNoPow)
what_to_lower |= POW_TO_EXP2;
if (!ctx->Const.NativeIntegers)
what_to_lower |= INT_DIV_TO_MUL_RCP;
progress = false;
/* Lowering */
do_mat_op_to_vec(ir);
lower_instructions(ir, what_to_lower);
progress = do_lower_jumps(ir, true, true, options->EmitNoMainReturn, options->EmitNoCont, options->EmitNoLoops) || progress;
progress = do_common_optimization(ir, true, true,
options->MaxUnrollIterations)
|| progress;
progress = lower_quadop_vector(ir, false) || progress;
if (options->MaxIfDepth == 0)
progress = lower_discard(ir) || progress;
progress = lower_if_to_cond_assign(ir, options->MaxIfDepth) || progress;
if (options->EmitNoNoise)
progress = lower_noise(ir) || progress;
/* If there are forms of indirect addressing that the driver
* cannot handle, perform the lowering pass.
*/
if (options->EmitNoIndirectInput || options->EmitNoIndirectOutput
|| options->EmitNoIndirectTemp || options->EmitNoIndirectUniform)
progress =
lower_variable_index_to_cond_assign(ir,
options->EmitNoIndirectInput,
options->EmitNoIndirectOutput,
options->EmitNoIndirectTemp,
options->EmitNoIndirectUniform)
|| progress;
progress = do_vec_index_to_cond_assign(ir) || progress;
} while (progress);
validate_ir_tree(ir);
}
for (unsigned i = 0; i < MESA_SHADER_TYPES; i++) {
struct gl_program *linked_prog;
if (prog->_LinkedShaders[i] == NULL)
continue;
linked_prog = get_mesa_program(ctx, prog, prog->_LinkedShaders[i]);
if (linked_prog) {
static const GLenum targets[] = {
GL_VERTEX_PROGRAM_ARB,
GL_FRAGMENT_PROGRAM_ARB,
GL_GEOMETRY_PROGRAM_NV
};
_mesa_reference_program(ctx, &prog->_LinkedShaders[i]->Program,
linked_prog);
if (!ctx->Driver.ProgramStringNotify(ctx, targets[i], linked_prog)) {
_mesa_reference_program(ctx, &prog->_LinkedShaders[i]->Program,
NULL);
_mesa_reference_program(ctx, &linked_prog, NULL);
return GL_FALSE;
}
}
_mesa_reference_program(ctx, &linked_prog, NULL);
}
return GL_TRUE;
}
void
st_translate_stream_output_info(glsl_to_tgsi_visitor *glsl_to_tgsi,
const GLuint outputMapping[],
struct pipe_stream_output_info *so)
{
unsigned i;
struct gl_transform_feedback_info *info =
&glsl_to_tgsi->shader_program->LinkedTransformFeedback;
for (i = 0; i < info->NumOutputs; i++) {
so->output[i].register_index =
outputMapping[info->Outputs[i].OutputRegister];
so->output[i].start_component = info->Outputs[i].ComponentOffset;
so->output[i].num_components = info->Outputs[i].NumComponents;
so->output[i].output_buffer = info->Outputs[i].OutputBuffer;
so->output[i].dst_offset = info->Outputs[i].DstOffset;
}
for (i = 0; i < PIPE_MAX_SO_BUFFERS; i++) {
so->stride[i] = info->BufferStride[i];
}
so->num_outputs = info->NumOutputs;
}
} /* extern "C" */