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android / platform / external / mesa3d / 89d2dac5548 / . / src / gallium / drivers / radeonsi / si_shader_llvm_ps.c
blob: c5d2cd56f7920a22e14daf249188cf869086edc3 [file] [log] [blame]
/*
* Copyright 2020 Advanced Micro Devices, Inc.
* All Rights Reserved.
*
* 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
* on the rights to use, copy, modify, merge, publish, distribute, sub
* license, 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 NON-INFRINGEMENT. IN NO EVENT SHALL
* THE AUTHOR(S) AND/OR THEIR SUPPLIERS 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.
*/
#include "si_pipe.h"
#include "si_shader_internal.h"
#include "sid.h"
LLVMValueRef si_get_sample_id(struct si_shader_context *ctx)
{
return si_unpack_param(ctx, ctx->args.ancillary, 8, 4);
}
static LLVMValueRef load_sample_mask_in(struct ac_shader_abi *abi)
{
struct si_shader_context *ctx = si_shader_context_from_abi(abi);
return ac_to_integer(&ctx->ac, ac_get_arg(&ctx->ac, ctx->args.sample_coverage));
}
static LLVMValueRef load_sample_position(struct ac_shader_abi *abi, LLVMValueRef sample_id)
{
struct si_shader_context *ctx = si_shader_context_from_abi(abi);
LLVMValueRef desc = ac_get_arg(&ctx->ac, ctx->rw_buffers);
LLVMValueRef buf_index = LLVMConstInt(ctx->ac.i32, SI_PS_CONST_SAMPLE_POSITIONS, 0);
LLVMValueRef resource = ac_build_load_to_sgpr(&ctx->ac, desc, buf_index);
/* offset = sample_id * 8 (8 = 2 floats containing samplepos.xy) */
LLVMValueRef offset0 =
LLVMBuildMul(ctx->ac.builder, sample_id, LLVMConstInt(ctx->ac.i32, 8, 0), "");
LLVMValueRef offset1 =
LLVMBuildAdd(ctx->ac.builder, offset0, LLVMConstInt(ctx->ac.i32, 4, 0), "");
LLVMValueRef pos[4] = {si_buffer_load_const(ctx, resource, offset0),
si_buffer_load_const(ctx, resource, offset1),
LLVMConstReal(ctx->ac.f32, 0), LLVMConstReal(ctx->ac.f32, 0)};
return ac_build_gather_values(&ctx->ac, pos, 4);
}
static LLVMValueRef si_nir_emit_fbfetch(struct ac_shader_abi *abi)
{
struct si_shader_context *ctx = si_shader_context_from_abi(abi);
struct ac_image_args args = {};
LLVMValueRef ptr, image, fmask;
/* Ignore src0, because KHR_blend_func_extended disallows multiple render
* targets.
*/
/* Load the image descriptor. */
STATIC_ASSERT(SI_PS_IMAGE_COLORBUF0 % 2 == 0);
ptr = ac_get_arg(&ctx->ac, ctx->rw_buffers);
ptr =
LLVMBuildPointerCast(ctx->ac.builder, ptr, ac_array_in_const32_addr_space(ctx->ac.v8i32), "");
image =
ac_build_load_to_sgpr(&ctx->ac, ptr, LLVMConstInt(ctx->ac.i32, SI_PS_IMAGE_COLORBUF0 / 2, 0));
unsigned chan = 0;
args.coords[chan++] = si_unpack_param(ctx, ctx->pos_fixed_pt, 0, 16);
if (!ctx->shader->key.mono.u.ps.fbfetch_is_1D)
args.coords[chan++] = si_unpack_param(ctx, ctx->pos_fixed_pt, 16, 16);
/* Get the current render target layer index. */
if (ctx->shader->key.mono.u.ps.fbfetch_layered)
args.coords[chan++] = si_unpack_param(ctx, ctx->args.ancillary, 16, 11);
if (ctx->shader->key.mono.u.ps.fbfetch_msaa)
args.coords[chan++] = si_get_sample_id(ctx);
if (ctx->shader->key.mono.u.ps.fbfetch_msaa && !(ctx->screen->debug_flags & DBG(NO_FMASK))) {
fmask = ac_build_load_to_sgpr(&ctx->ac, ptr,
LLVMConstInt(ctx->ac.i32, SI_PS_IMAGE_COLORBUF0_FMASK / 2, 0));
ac_apply_fmask_to_sample(&ctx->ac, fmask, args.coords,
ctx->shader->key.mono.u.ps.fbfetch_layered);
}
args.opcode = ac_image_load;
args.resource = image;
args.dmask = 0xf;
args.attributes = AC_FUNC_ATTR_READNONE;
if (ctx->shader->key.mono.u.ps.fbfetch_msaa)
args.dim =
ctx->shader->key.mono.u.ps.fbfetch_layered ? ac_image_2darraymsaa : ac_image_2dmsaa;
else if (ctx->shader->key.mono.u.ps.fbfetch_is_1D)
args.dim = ctx->shader->key.mono.u.ps.fbfetch_layered ? ac_image_1darray : ac_image_1d;
else
args.dim = ctx->shader->key.mono.u.ps.fbfetch_layered ? ac_image_2darray : ac_image_2d;
return ac_build_image_opcode(&ctx->ac, &args);
}
static LLVMValueRef si_build_fs_interp(struct si_shader_context *ctx, unsigned attr_index,
unsigned chan, LLVMValueRef prim_mask, LLVMValueRef i,
LLVMValueRef j)
{
if (i || j) {
return ac_build_fs_interp(&ctx->ac, LLVMConstInt(ctx->ac.i32, chan, 0),
LLVMConstInt(ctx->ac.i32, attr_index, 0), prim_mask, i, j);
}
return ac_build_fs_interp_mov(&ctx->ac, LLVMConstInt(ctx->ac.i32, 2, 0), /* P0 */
LLVMConstInt(ctx->ac.i32, chan, 0),
LLVMConstInt(ctx->ac.i32, attr_index, 0), prim_mask);
}
/**
* Interpolate a fragment shader input.
*
* @param ctx context
* @param input_index index of the input in hardware
* @param semantic_name TGSI_SEMANTIC_*
* @param semantic_index semantic index
* @param num_interp_inputs number of all interpolated inputs (= BCOLOR offset)
* @param colors_read_mask color components read (4 bits for each color, 8 bits in total)
* @param interp_param interpolation weights (i,j)
* @param prim_mask SI_PARAM_PRIM_MASK
* @param face SI_PARAM_FRONT_FACE
* @param result the return value (4 components)
*/
static void interp_fs_color(struct si_shader_context *ctx, unsigned input_index,
unsigned semantic_index, unsigned num_interp_inputs,
unsigned colors_read_mask, LLVMValueRef interp_param,
LLVMValueRef prim_mask, LLVMValueRef face, LLVMValueRef result[4])
{
LLVMValueRef i = NULL, j = NULL;
unsigned chan;
/* fs.constant returns the param from the middle vertex, so it's not
* really useful for flat shading. It's meant to be used for custom
* interpolation (but the intrinsic can't fetch from the other two
* vertices).
*
* Luckily, it doesn't matter, because we rely on the FLAT_SHADE state
* to do the right thing. The only reason we use fs.constant is that
* fs.interp cannot be used on integers, because they can be equal
* to NaN.
*
* When interp is false we will use fs.constant or for newer llvm,
* amdgcn.interp.mov.
*/
bool interp = interp_param != NULL;
if (interp) {
interp_param =
LLVMBuildBitCast(ctx->ac.builder, interp_param, ctx->ac.v2f32, "");
i = LLVMBuildExtractElement(ctx->ac.builder, interp_param, ctx->ac.i32_0, "");
j = LLVMBuildExtractElement(ctx->ac.builder, interp_param, ctx->ac.i32_1, "");
}
if (ctx->shader->key.part.ps.prolog.color_two_side) {
LLVMValueRef is_face_positive;
/* If BCOLOR0 is used, BCOLOR1 is at offset "num_inputs + 1",
* otherwise it's at offset "num_inputs".
*/
unsigned back_attr_offset = num_interp_inputs;
if (semantic_index == 1 && colors_read_mask & 0xf)
back_attr_offset += 1;
is_face_positive = LLVMBuildICmp(ctx->ac.builder, LLVMIntNE, face, ctx->ac.i32_0, "");
for (chan = 0; chan < 4; chan++) {
LLVMValueRef front, back;
front = si_build_fs_interp(ctx, input_index, chan, prim_mask, i, j);
back = si_build_fs_interp(ctx, back_attr_offset, chan, prim_mask, i, j);
result[chan] = LLVMBuildSelect(ctx->ac.builder, is_face_positive, front, back, "");
}
} else {
for (chan = 0; chan < 4; chan++) {
result[chan] = si_build_fs_interp(ctx, input_index, chan, prim_mask, i, j);
}
}
}
static void si_alpha_test(struct si_shader_context *ctx, LLVMValueRef alpha)
{
if (ctx->shader->key.part.ps.epilog.alpha_func != PIPE_FUNC_NEVER) {
static LLVMRealPredicate cond_map[PIPE_FUNC_ALWAYS + 1] = {
[PIPE_FUNC_LESS] = LLVMRealOLT, [PIPE_FUNC_EQUAL] = LLVMRealOEQ,
[PIPE_FUNC_LEQUAL] = LLVMRealOLE, [PIPE_FUNC_GREATER] = LLVMRealOGT,
[PIPE_FUNC_NOTEQUAL] = LLVMRealONE, [PIPE_FUNC_GEQUAL] = LLVMRealOGE,
};
LLVMRealPredicate cond = cond_map[ctx->shader->key.part.ps.epilog.alpha_func];
assert(cond);
LLVMValueRef alpha_ref = LLVMGetParam(ctx->main_fn, SI_PARAM_ALPHA_REF);
LLVMValueRef alpha_pass = LLVMBuildFCmp(ctx->ac.builder, cond, alpha, alpha_ref, "");
ac_build_kill_if_false(&ctx->ac, alpha_pass);
} else {
ac_build_kill_if_false(&ctx->ac, ctx->ac.i1false);
}
}
static LLVMValueRef si_scale_alpha_by_sample_mask(struct si_shader_context *ctx, LLVMValueRef alpha,
unsigned samplemask_param)
{
LLVMValueRef coverage;
/* alpha = alpha * popcount(coverage) / SI_NUM_SMOOTH_AA_SAMPLES */
coverage = LLVMGetParam(ctx->main_fn, samplemask_param);
coverage = ac_to_integer(&ctx->ac, coverage);
coverage = ac_build_intrinsic(&ctx->ac, "llvm.ctpop.i32", ctx->ac.i32, &coverage, 1,
AC_FUNC_ATTR_READNONE);
coverage = LLVMBuildUIToFP(ctx->ac.builder, coverage, ctx->ac.f32, "");
coverage = LLVMBuildFMul(ctx->ac.builder, coverage,
LLVMConstReal(ctx->ac.f32, 1.0 / SI_NUM_SMOOTH_AA_SAMPLES), "");
return LLVMBuildFMul(ctx->ac.builder, alpha, coverage, "");
}
struct si_ps_exports {
unsigned num;
struct ac_export_args args[10];
};
static void si_export_mrt_z(struct si_shader_context *ctx, LLVMValueRef depth, LLVMValueRef stencil,
LLVMValueRef samplemask, struct si_ps_exports *exp)
{
struct ac_export_args args;
ac_export_mrt_z(&ctx->ac, depth, stencil, samplemask, &args);
memcpy(&exp->args[exp->num++], &args, sizeof(args));
}
/* Initialize arguments for the shader export intrinsic */
static void si_llvm_init_ps_export_args(struct si_shader_context *ctx, LLVMValueRef *values,
unsigned cbuf, unsigned compacted_mrt_index,
struct ac_export_args *args)
{
const struct si_shader_key *key = &ctx->shader->key;
unsigned col_formats = key->part.ps.epilog.spi_shader_col_format;
LLVMValueRef f32undef = LLVMGetUndef(ctx->ac.f32);
unsigned spi_shader_col_format;
unsigned chan;
bool is_int8, is_int10;
assert(cbuf >= 0 && cbuf < 8);
spi_shader_col_format = (col_formats >> (cbuf * 4)) & 0xf;
is_int8 = (key->part.ps.epilog.color_is_int8 >> cbuf) & 0x1;
is_int10 = (key->part.ps.epilog.color_is_int10 >> cbuf) & 0x1;
/* Default is 0xf. Adjusted below depending on the format. */
args->enabled_channels = 0xf; /* writemask */
/* Specify whether the EXEC mask represents the valid mask */
args->valid_mask = 0;
/* Specify whether this is the last export */
args->done = 0;
/* Specify the target we are exporting */
args->target = V_008DFC_SQ_EXP_MRT + compacted_mrt_index;
args->compr = false;
args->out[0] = f32undef;
args->out[1] = f32undef;
args->out[2] = f32undef;
args->out[3] = f32undef;
LLVMValueRef (*packf)(struct ac_llvm_context * ctx, LLVMValueRef args[2]) = NULL;
LLVMValueRef (*packi)(struct ac_llvm_context * ctx, LLVMValueRef args[2], unsigned bits,
bool hi) = NULL;
switch (spi_shader_col_format) {
case V_028714_SPI_SHADER_ZERO:
args->enabled_channels = 0; /* writemask */
args->target = V_008DFC_SQ_EXP_NULL;
break;
case V_028714_SPI_SHADER_32_R:
args->enabled_channels = 1; /* writemask */
args->out[0] = values[0];
break;
case V_028714_SPI_SHADER_32_GR:
args->enabled_channels = 0x3; /* writemask */
args->out[0] = values[0];
args->out[1] = values[1];
break;
case V_028714_SPI_SHADER_32_AR:
if (ctx->screen->info.chip_class >= GFX10) {
args->enabled_channels = 0x3; /* writemask */
args->out[0] = values[0];
args->out[1] = values[3];
} else {
args->enabled_channels = 0x9; /* writemask */
args->out[0] = values[0];
args->out[3] = values[3];
}
break;
case V_028714_SPI_SHADER_FP16_ABGR:
packf = ac_build_cvt_pkrtz_f16;
break;
case V_028714_SPI_SHADER_UNORM16_ABGR:
packf = ac_build_cvt_pknorm_u16;
break;
case V_028714_SPI_SHADER_SNORM16_ABGR:
packf = ac_build_cvt_pknorm_i16;
break;
case V_028714_SPI_SHADER_UINT16_ABGR:
packi = ac_build_cvt_pk_u16;
break;
case V_028714_SPI_SHADER_SINT16_ABGR:
packi = ac_build_cvt_pk_i16;
break;
case V_028714_SPI_SHADER_32_ABGR:
memcpy(&args->out[0], values, sizeof(values[0]) * 4);
break;
}
/* Pack f16 or norm_i16/u16. */
if (packf) {
for (chan = 0; chan < 2; chan++) {
LLVMValueRef pack_args[2] = {values[2 * chan], values[2 * chan + 1]};
LLVMValueRef packed;
packed = packf(&ctx->ac, pack_args);
args->out[chan] = ac_to_float(&ctx->ac, packed);
}
args->compr = 1; /* COMPR flag */
}
/* Pack i16/u16. */
if (packi) {
for (chan = 0; chan < 2; chan++) {
LLVMValueRef pack_args[2] = {ac_to_integer(&ctx->ac, values[2 * chan]),
ac_to_integer(&ctx->ac, values[2 * chan + 1])};
LLVMValueRef packed;
packed = packi(&ctx->ac, pack_args, is_int8 ? 8 : is_int10 ? 10 : 16, chan == 1);
args->out[chan] = ac_to_float(&ctx->ac, packed);
}
args->compr = 1; /* COMPR flag */
}
}
static bool si_export_mrt_color(struct si_shader_context *ctx, LLVMValueRef *color, unsigned index,
unsigned compacted_mrt_index, unsigned samplemask_param,
bool is_last, struct si_ps_exports *exp)
{
int i;
/* Clamp color */
if (ctx->shader->key.part.ps.epilog.clamp_color)
for (i = 0; i < 4; i++)
color[i] = ac_build_clamp(&ctx->ac, color[i]);
/* Alpha to one */
if (ctx->shader->key.part.ps.epilog.alpha_to_one)
color[3] = ctx->ac.f32_1;
/* Alpha test */
if (index == 0 && ctx->shader->key.part.ps.epilog.alpha_func != PIPE_FUNC_ALWAYS)
si_alpha_test(ctx, color[3]);
/* Line & polygon smoothing */
if (ctx->shader->key.part.ps.epilog.poly_line_smoothing)
color[3] = si_scale_alpha_by_sample_mask(ctx, color[3], samplemask_param);
/* If last_cbuf > 0, FS_COLOR0_WRITES_ALL_CBUFS is true. */
if (ctx->shader->key.part.ps.epilog.last_cbuf > 0) {
struct ac_export_args args[8];
int c, last = -1;
assert(compacted_mrt_index == 0);
/* Get the export arguments, also find out what the last one is. */
for (c = 0; c <= ctx->shader->key.part.ps.epilog.last_cbuf; c++) {
si_llvm_init_ps_export_args(ctx, color, c, compacted_mrt_index, &args[c]);
if (args[c].enabled_channels) {
compacted_mrt_index++;
last = c;
}
}
if (last == -1)
return false;
/* Emit all exports. */
for (c = 0; c <= ctx->shader->key.part.ps.epilog.last_cbuf; c++) {
if (is_last && last == c) {
args[c].valid_mask = 1; /* whether the EXEC mask is valid */
args[c].done = 1; /* DONE bit */
} else if (!args[c].enabled_channels)
continue; /* unnecessary NULL export */
memcpy(&exp->args[exp->num++], &args[c], sizeof(args[c]));
}
} else {
struct ac_export_args args;
/* Export */
si_llvm_init_ps_export_args(ctx, color, index, compacted_mrt_index, &args);
if (is_last) {
args.valid_mask = 1; /* whether the EXEC mask is valid */
args.done = 1; /* DONE bit */
} else if (!args.enabled_channels)
return false; /* unnecessary NULL export */
memcpy(&exp->args[exp->num++], &args, sizeof(args));
}
return true;
}
static void si_emit_ps_exports(struct si_shader_context *ctx, struct si_ps_exports *exp)
{
for (unsigned i = 0; i < exp->num; i++)
ac_build_export(&ctx->ac, &exp->args[i]);
}
/**
* Return PS outputs in this order:
*
* v[0:3] = color0.xyzw
* v[4:7] = color1.xyzw
* ...
* vN+0 = Depth
* vN+1 = Stencil
* vN+2 = SampleMask
* vN+3 = SampleMaskIn (used for OpenGL smoothing)
*
* The alpha-ref SGPR is returned via its original location.
*/
static void si_llvm_return_fs_outputs(struct ac_shader_abi *abi, unsigned max_outputs,
LLVMValueRef *addrs)
{
struct si_shader_context *ctx = si_shader_context_from_abi(abi);
struct si_shader *shader = ctx->shader;
struct si_shader_info *info = &shader->selector->info;
LLVMBuilderRef builder = ctx->ac.builder;
unsigned i, j, first_vgpr, vgpr;
LLVMValueRef color[8][4] = {};
LLVMValueRef depth = NULL, stencil = NULL, samplemask = NULL;
LLVMValueRef ret;
if (ctx->postponed_kill)
ac_build_kill_if_false(&ctx->ac, LLVMBuildLoad(builder, ctx->postponed_kill, ""));
/* Read the output values. */
for (i = 0; i < info->num_outputs; i++) {
unsigned semantic_name = info->output_semantic_name[i];
unsigned semantic_index = info->output_semantic_index[i];
switch (semantic_name) {
case TGSI_SEMANTIC_COLOR:
assert(semantic_index < 8);
for (j = 0; j < 4; j++) {
LLVMValueRef ptr = addrs[4 * i + j];
LLVMValueRef result = LLVMBuildLoad(builder, ptr, "");
color[semantic_index][j] = result;
}
break;
case TGSI_SEMANTIC_POSITION:
depth = LLVMBuildLoad(builder, addrs[4 * i + 0], "");
break;
case TGSI_SEMANTIC_STENCIL:
stencil = LLVMBuildLoad(builder, addrs[4 * i + 0], "");
break;
case TGSI_SEMANTIC_SAMPLEMASK:
samplemask = LLVMBuildLoad(builder, addrs[4 * i + 0], "");
break;
default:
fprintf(stderr, "Warning: GFX6 unhandled fs output type:%d\n", semantic_name);
}
}
/* Fill the return structure. */
ret = ctx->return_value;
/* Set SGPRs. */
ret = LLVMBuildInsertValue(
builder, ret, ac_to_integer(&ctx->ac, LLVMGetParam(ctx->main_fn, SI_PARAM_ALPHA_REF)),
SI_SGPR_ALPHA_REF, "");
/* Set VGPRs */
first_vgpr = vgpr = SI_SGPR_ALPHA_REF + 1;
for (i = 0; i < ARRAY_SIZE(color); i++) {
if (!color[i][0])
continue;
for (j = 0; j < 4; j++)
ret = LLVMBuildInsertValue(builder, ret, color[i][j], vgpr++, "");
}
if (depth)
ret = LLVMBuildInsertValue(builder, ret, depth, vgpr++, "");
if (stencil)
ret = LLVMBuildInsertValue(builder, ret, stencil, vgpr++, "");
if (samplemask)
ret = LLVMBuildInsertValue(builder, ret, samplemask, vgpr++, "");
/* Add the input sample mask for smoothing at the end. */
if (vgpr < first_vgpr + PS_EPILOG_SAMPLEMASK_MIN_LOC)
vgpr = first_vgpr + PS_EPILOG_SAMPLEMASK_MIN_LOC;
ret = LLVMBuildInsertValue(builder, ret, LLVMGetParam(ctx->main_fn, SI_PARAM_SAMPLE_COVERAGE),
vgpr++, "");
ctx->return_value = ret;
}
static void si_llvm_emit_polygon_stipple(struct si_shader_context *ctx,
LLVMValueRef param_rw_buffers,
struct ac_arg param_pos_fixed_pt)
{
LLVMBuilderRef builder = ctx->ac.builder;
LLVMValueRef slot, desc, offset, row, bit, address[2];
/* Use the fixed-point gl_FragCoord input.
* Since the stipple pattern is 32x32 and it repeats, just get 5 bits
* per coordinate to get the repeating effect.
*/
address[0] = si_unpack_param(ctx, param_pos_fixed_pt, 0, 5);
address[1] = si_unpack_param(ctx, param_pos_fixed_pt, 16, 5);
/* Load the buffer descriptor. */
slot = LLVMConstInt(ctx->ac.i32, SI_PS_CONST_POLY_STIPPLE, 0);
desc = ac_build_load_to_sgpr(&ctx->ac, param_rw_buffers, slot);
/* The stipple pattern is 32x32, each row has 32 bits. */
offset = LLVMBuildMul(builder, address[1], LLVMConstInt(ctx->ac.i32, 4, 0), "");
row = si_buffer_load_const(ctx, desc, offset);
row = ac_to_integer(&ctx->ac, row);
bit = LLVMBuildLShr(builder, row, address[0], "");
bit = LLVMBuildTrunc(builder, bit, ctx->ac.i1, "");
ac_build_kill_if_false(&ctx->ac, bit);
}
/**
* Build the pixel shader prolog function. This handles:
* - two-side color selection and interpolation
* - overriding interpolation parameters for the API PS
* - polygon stippling
*
* All preloaded SGPRs and VGPRs are passed through unmodified unless they are
* overriden by other states. (e.g. per-sample interpolation)
* Interpolated colors are stored after the preloaded VGPRs.
*/
void si_llvm_build_ps_prolog(struct si_shader_context *ctx, union si_shader_part_key *key)
{
LLVMValueRef ret, func;
int num_returns, i, num_color_channels;
memset(&ctx->args, 0, sizeof(ctx->args));
/* Declare inputs. */
LLVMTypeRef return_types[AC_MAX_ARGS];
num_returns = 0;
num_color_channels = util_bitcount(key->ps_prolog.colors_read);
assert(key->ps_prolog.num_input_sgprs + key->ps_prolog.num_input_vgprs + num_color_channels <=
AC_MAX_ARGS);
for (i = 0; i < key->ps_prolog.num_input_sgprs; i++) {
ac_add_arg(&ctx->args, AC_ARG_SGPR, 1, AC_ARG_INT, NULL);
return_types[num_returns++] = ctx->ac.i32;
}
struct ac_arg pos_fixed_pt;
struct ac_arg ancillary;
struct ac_arg param_sample_mask;
for (i = 0; i < key->ps_prolog.num_input_vgprs; i++) {
struct ac_arg *arg = NULL;
if (i == key->ps_prolog.ancillary_vgpr_index) {
arg = &ancillary;
} else if (i == key->ps_prolog.ancillary_vgpr_index + 1) {
arg = &param_sample_mask;
} else if (i == key->ps_prolog.num_input_vgprs - 1) {
/* POS_FIXED_PT is always last. */
arg = &pos_fixed_pt;
}
ac_add_arg(&ctx->args, AC_ARG_VGPR, 1, AC_ARG_FLOAT, arg);
return_types[num_returns++] = ctx->ac.f32;
}
/* Declare outputs (same as inputs + add colors if needed) */
for (i = 0; i < num_color_channels; i++)
return_types[num_returns++] = ctx->ac.f32;
/* Create the function. */
si_llvm_create_func(ctx, "ps_prolog", return_types, num_returns, 0);
func = ctx->main_fn;
/* Copy inputs to outputs. This should be no-op, as the registers match,
* but it will prevent the compiler from overwriting them unintentionally.
*/
ret = ctx->return_value;
for (i = 0; i < ctx->args.arg_count; i++) {
LLVMValueRef p = LLVMGetParam(func, i);
ret = LLVMBuildInsertValue(ctx->ac.builder, ret, p, i, "");
}
/* Polygon stippling. */
if (key->ps_prolog.states.poly_stipple) {
LLVMValueRef list = si_prolog_get_rw_buffers(ctx);
si_llvm_emit_polygon_stipple(ctx, list, pos_fixed_pt);
}
if (key->ps_prolog.states.bc_optimize_for_persp ||
key->ps_prolog.states.bc_optimize_for_linear) {
unsigned i, base = key->ps_prolog.num_input_sgprs;
LLVMValueRef center[2], centroid[2], tmp, bc_optimize;
/* The shader should do: if (PRIM_MASK[31]) CENTROID = CENTER;
* The hw doesn't compute CENTROID if the whole wave only
* contains fully-covered quads.
*
* PRIM_MASK is after user SGPRs.
*/
bc_optimize = LLVMGetParam(func, SI_PS_NUM_USER_SGPR);
bc_optimize =
LLVMBuildLShr(ctx->ac.builder, bc_optimize, LLVMConstInt(ctx->ac.i32, 31, 0), "");
bc_optimize = LLVMBuildTrunc(ctx->ac.builder, bc_optimize, ctx->ac.i1, "");
if (key->ps_prolog.states.bc_optimize_for_persp) {
/* Read PERSP_CENTER. */
for (i = 0; i < 2; i++)
center[i] = LLVMGetParam(func, base + 2 + i);
/* Read PERSP_CENTROID. */
for (i = 0; i < 2; i++)
centroid[i] = LLVMGetParam(func, base + 4 + i);
/* Select PERSP_CENTROID. */
for (i = 0; i < 2; i++) {
tmp = LLVMBuildSelect(ctx->ac.builder, bc_optimize, center[i], centroid[i], "");
ret = LLVMBuildInsertValue(ctx->ac.builder, ret, tmp, base + 4 + i, "");
}
}
if (key->ps_prolog.states.bc_optimize_for_linear) {
/* Read LINEAR_CENTER. */
for (i = 0; i < 2; i++)
center[i] = LLVMGetParam(func, base + 8 + i);
/* Read LINEAR_CENTROID. */
for (i = 0; i < 2; i++)
centroid[i] = LLVMGetParam(func, base + 10 + i);
/* Select LINEAR_CENTROID. */
for (i = 0; i < 2; i++) {
tmp = LLVMBuildSelect(ctx->ac.builder, bc_optimize, center[i], centroid[i], "");
ret = LLVMBuildInsertValue(ctx->ac.builder, ret, tmp, base + 10 + i, "");
}
}
}
/* Force per-sample interpolation. */
if (key->ps_prolog.states.force_persp_sample_interp) {
unsigned i, base = key->ps_prolog.num_input_sgprs;
LLVMValueRef persp_sample[2];
/* Read PERSP_SAMPLE. */
for (i = 0; i < 2; i++)
persp_sample[i] = LLVMGetParam(func, base + i);
/* Overwrite PERSP_CENTER. */
for (i = 0; i < 2; i++)
ret = LLVMBuildInsertValue(ctx->ac.builder, ret, persp_sample[i], base + 2 + i, "");
/* Overwrite PERSP_CENTROID. */
for (i = 0; i < 2; i++)
ret = LLVMBuildInsertValue(ctx->ac.builder, ret, persp_sample[i], base + 4 + i, "");
}
if (key->ps_prolog.states.force_linear_sample_interp) {
unsigned i, base = key->ps_prolog.num_input_sgprs;
LLVMValueRef linear_sample[2];
/* Read LINEAR_SAMPLE. */
for (i = 0; i < 2; i++)
linear_sample[i] = LLVMGetParam(func, base + 6 + i);
/* Overwrite LINEAR_CENTER. */
for (i = 0; i < 2; i++)
ret = LLVMBuildInsertValue(ctx->ac.builder, ret, linear_sample[i], base + 8 + i, "");
/* Overwrite LINEAR_CENTROID. */
for (i = 0; i < 2; i++)
ret = LLVMBuildInsertValue(ctx->ac.builder, ret, linear_sample[i], base + 10 + i, "");
}
/* Force center interpolation. */
if (key->ps_prolog.states.force_persp_center_interp) {
unsigned i, base = key->ps_prolog.num_input_sgprs;
LLVMValueRef persp_center[2];
/* Read PERSP_CENTER. */
for (i = 0; i < 2; i++)
persp_center[i] = LLVMGetParam(func, base + 2 + i);
/* Overwrite PERSP_SAMPLE. */
for (i = 0; i < 2; i++)
ret = LLVMBuildInsertValue(ctx->ac.builder, ret, persp_center[i], base + i, "");
/* Overwrite PERSP_CENTROID. */
for (i = 0; i < 2; i++)
ret = LLVMBuildInsertValue(ctx->ac.builder, ret, persp_center[i], base + 4 + i, "");
}
if (key->ps_prolog.states.force_linear_center_interp) {
unsigned i, base = key->ps_prolog.num_input_sgprs;
LLVMValueRef linear_center[2];
/* Read LINEAR_CENTER. */
for (i = 0; i < 2; i++)
linear_center[i] = LLVMGetParam(func, base + 8 + i);
/* Overwrite LINEAR_SAMPLE. */
for (i = 0; i < 2; i++)
ret = LLVMBuildInsertValue(ctx->ac.builder, ret, linear_center[i], base + 6 + i, "");
/* Overwrite LINEAR_CENTROID. */
for (i = 0; i < 2; i++)
ret = LLVMBuildInsertValue(ctx->ac.builder, ret, linear_center[i], base + 10 + i, "");
}
/* Interpolate colors. */
unsigned color_out_idx = 0;
for (i = 0; i < 2; i++) {
unsigned writemask = (key->ps_prolog.colors_read >> (i * 4)) & 0xf;
unsigned face_vgpr = key->ps_prolog.num_input_sgprs + key->ps_prolog.face_vgpr_index;
LLVMValueRef interp[2], color[4];
LLVMValueRef interp_ij = NULL, prim_mask = NULL, face = NULL;
if (!writemask)
continue;
/* If the interpolation qualifier is not CONSTANT (-1). */
if (key->ps_prolog.color_interp_vgpr_index[i] != -1) {
unsigned interp_vgpr =
key->ps_prolog.num_input_sgprs + key->ps_prolog.color_interp_vgpr_index[i];
/* Get the (i,j) updated by bc_optimize handling. */
interp[0] = LLVMBuildExtractValue(ctx->ac.builder, ret, interp_vgpr, "");
interp[1] = LLVMBuildExtractValue(ctx->ac.builder, ret, interp_vgpr + 1, "");
interp_ij = ac_build_gather_values(&ctx->ac, interp, 2);
}
/* Use the absolute location of the input. */
prim_mask = LLVMGetParam(func, SI_PS_NUM_USER_SGPR);
if (key->ps_prolog.states.color_two_side) {
face = LLVMGetParam(func, face_vgpr);
face = ac_to_integer(&ctx->ac, face);
}
interp_fs_color(ctx, key->ps_prolog.color_attr_index[i], i, key->ps_prolog.num_interp_inputs,
key->ps_prolog.colors_read, interp_ij, prim_mask, face, color);
while (writemask) {
unsigned chan = u_bit_scan(&writemask);
ret = LLVMBuildInsertValue(ctx->ac.builder, ret, color[chan],
ctx->args.arg_count + color_out_idx++, "");
}
}
/* Section 15.2.2 (Shader Inputs) of the OpenGL 4.5 (Core Profile) spec
* says:
*
* "When per-sample shading is active due to the use of a fragment
* input qualified by sample or due to the use of the gl_SampleID
* or gl_SamplePosition variables, only the bit for the current
* sample is set in gl_SampleMaskIn. When state specifies multiple
* fragment shader invocations for a given fragment, the sample
* mask for any single fragment shader invocation may specify a
* subset of the covered samples for the fragment. In this case,
* the bit corresponding to each covered sample will be set in
* exactly one fragment shader invocation."
*
* The samplemask loaded by hardware is always the coverage of the
* entire pixel/fragment, so mask bits out based on the sample ID.
*/
if (key->ps_prolog.states.samplemask_log_ps_iter) {
/* The bit pattern matches that used by fixed function fragment
* processing. */
static const uint16_t ps_iter_masks[] = {
0xffff, /* not used */
0x5555, 0x1111, 0x0101, 0x0001,
};
assert(key->ps_prolog.states.samplemask_log_ps_iter < ARRAY_SIZE(ps_iter_masks));
uint32_t ps_iter_mask = ps_iter_masks[key->ps_prolog.states.samplemask_log_ps_iter];
LLVMValueRef sampleid = si_unpack_param(ctx, ancillary, 8, 4);
LLVMValueRef samplemask = ac_get_arg(&ctx->ac, param_sample_mask);
samplemask = ac_to_integer(&ctx->ac, samplemask);
samplemask =
LLVMBuildAnd(ctx->ac.builder, samplemask,
LLVMBuildShl(ctx->ac.builder, LLVMConstInt(ctx->ac.i32, ps_iter_mask, false),
sampleid, ""),
"");
samplemask = ac_to_float(&ctx->ac, samplemask);
ret = LLVMBuildInsertValue(ctx->ac.builder, ret, samplemask, param_sample_mask.arg_index, "");
}
/* Tell LLVM to insert WQM instruction sequence when needed. */
if (key->ps_prolog.wqm) {
LLVMAddTargetDependentFunctionAttr(func, "amdgpu-ps-wqm-outputs", "");
}
si_llvm_build_ret(ctx, ret);
}
/**
* Build the pixel shader epilog function. This handles everything that must be
* emulated for pixel shader exports. (alpha-test, format conversions, etc)
*/
void si_llvm_build_ps_epilog(struct si_shader_context *ctx, union si_shader_part_key *key)
{
LLVMValueRef depth = NULL, stencil = NULL, samplemask = NULL;
int i;
struct si_ps_exports exp = {};
memset(&ctx->args, 0, sizeof(ctx->args));
/* Declare input SGPRs. */
ac_add_arg(&ctx->args, AC_ARG_SGPR, 1, AC_ARG_INT, &ctx->rw_buffers);
ac_add_arg(&ctx->args, AC_ARG_SGPR, 1, AC_ARG_INT, &ctx->bindless_samplers_and_images);
ac_add_arg(&ctx->args, AC_ARG_SGPR, 1, AC_ARG_INT, &ctx->const_and_shader_buffers);
ac_add_arg(&ctx->args, AC_ARG_SGPR, 1, AC_ARG_INT, &ctx->samplers_and_images);
si_add_arg_checked(&ctx->args, AC_ARG_SGPR, 1, AC_ARG_FLOAT, NULL, SI_PARAM_ALPHA_REF);
/* Declare input VGPRs. */
unsigned required_num_params =
ctx->args.num_sgprs_used + util_bitcount(key->ps_epilog.colors_written) * 4 +
key->ps_epilog.writes_z + key->ps_epilog.writes_stencil + key->ps_epilog.writes_samplemask;
required_num_params =
MAX2(required_num_params, ctx->args.num_sgprs_used + PS_EPILOG_SAMPLEMASK_MIN_LOC + 1);
while (ctx->args.arg_count < required_num_params)
ac_add_arg(&ctx->args, AC_ARG_VGPR, 1, AC_ARG_FLOAT, NULL);
/* Create the function. */
si_llvm_create_func(ctx, "ps_epilog", NULL, 0, 0);
/* Disable elimination of unused inputs. */
ac_llvm_add_target_dep_function_attr(ctx->main_fn, "InitialPSInputAddr", 0xffffff);
/* Process colors. */
unsigned vgpr = ctx->args.num_sgprs_used;
unsigned colors_written = key->ps_epilog.colors_written;
int last_color_export = -1;
/* Find the last color export. */
if (!key->ps_epilog.writes_z && !key->ps_epilog.writes_stencil &&
!key->ps_epilog.writes_samplemask) {
unsigned spi_format = key->ps_epilog.states.spi_shader_col_format;
/* If last_cbuf > 0, FS_COLOR0_WRITES_ALL_CBUFS is true. */
if (colors_written == 0x1 && key->ps_epilog.states.last_cbuf > 0) {
/* Just set this if any of the colorbuffers are enabled. */
if (spi_format & ((1ull << (4 * (key->ps_epilog.states.last_cbuf + 1))) - 1))
last_color_export = 0;
} else {
for (i = 0; i < 8; i++)
if (colors_written & (1 << i) && (spi_format >> (i * 4)) & 0xf)
last_color_export = i;
}
}
unsigned num_compacted_mrts = 0;
while (colors_written) {
LLVMValueRef color[4];
int output_index = u_bit_scan(&colors_written);
for (i = 0; i < 4; i++)
color[i] = LLVMGetParam(ctx->main_fn, vgpr++);
if (si_export_mrt_color(ctx, color, output_index, num_compacted_mrts,
ctx->args.arg_count - 1,
output_index == last_color_export, &exp))
num_compacted_mrts++;
}
/* Process depth, stencil, samplemask. */
if (key->ps_epilog.writes_z)
depth = LLVMGetParam(ctx->main_fn, vgpr++);
if (key->ps_epilog.writes_stencil)
stencil = LLVMGetParam(ctx->main_fn, vgpr++);
if (key->ps_epilog.writes_samplemask)
samplemask = LLVMGetParam(ctx->main_fn, vgpr++);
if (depth || stencil || samplemask)
si_export_mrt_z(ctx, depth, stencil, samplemask, &exp);
else if (last_color_export == -1)
ac_build_export_null(&ctx->ac);
if (exp.num)
si_emit_ps_exports(ctx, &exp);
/* Compile. */
LLVMBuildRetVoid(ctx->ac.builder);
}
void si_llvm_build_monolithic_ps(struct si_shader_context *ctx, struct si_shader *shader)
{
LLVMValueRef parts[3];
unsigned num_parts = 0, main_index;
LLVMValueRef main_fn = ctx->main_fn;
union si_shader_part_key prolog_key;
si_get_ps_prolog_key(shader, &prolog_key, false);
if (si_need_ps_prolog(&prolog_key)) {
si_llvm_build_ps_prolog(ctx, &prolog_key);
parts[num_parts++] = ctx->main_fn;
}
main_index = num_parts;
parts[num_parts++] = main_fn;
union si_shader_part_key epilog_key;
si_get_ps_epilog_key(shader, &epilog_key);
si_llvm_build_ps_epilog(ctx, &epilog_key);
parts[num_parts++] = ctx->main_fn;
si_build_wrapper_function(ctx, parts, num_parts, main_index, 0);
}
void si_llvm_init_ps_callbacks(struct si_shader_context *ctx)
{
ctx->abi.emit_outputs = si_llvm_return_fs_outputs;
ctx->abi.load_sample_position = load_sample_position;
ctx->abi.load_sample_mask_in = load_sample_mask_in;
ctx->abi.emit_fbfetch = si_nir_emit_fbfetch;
}