| /* |
| * Copyright © 2019 Intel Corporation |
| * |
| * 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. |
| */ |
| |
| #include "compiler/nir/nir.h" |
| #include "compiler/nir/nir_builder.h" |
| #include "gl_nir.h" |
| #include "ir_uniform.h" |
| |
| #include "util/compiler.h" |
| #include "main/mtypes.h" |
| |
| static nir_ssa_def * |
| get_block_array_index(nir_builder *b, nir_deref_instr *deref, |
| const struct gl_shader_program *shader_program) |
| { |
| unsigned array_elements = 1; |
| |
| /* Build a block name such as "block[2][0]" for finding in the list of |
| * blocks later on as well as an optional dynamic index which gets added |
| * to the block index later. |
| */ |
| int binding = 0; |
| const char *block_name = ""; |
| nir_ssa_def *nonconst_index = NULL; |
| while (deref->deref_type == nir_deref_type_array) { |
| nir_deref_instr *parent = nir_deref_instr_parent(deref); |
| assert(parent && glsl_type_is_array(parent->type)); |
| unsigned arr_size = glsl_get_length(parent->type); |
| |
| if (nir_src_is_const(deref->arr.index)) { |
| unsigned arr_index = nir_src_as_uint(deref->arr.index); |
| |
| /* We're walking the deref from the tail so prepend the array index */ |
| block_name = ralloc_asprintf(b->shader, "[%u]%s", arr_index, |
| block_name); |
| |
| binding += arr_index * array_elements; |
| } else { |
| nir_ssa_def *arr_index = nir_ssa_for_src(b, deref->arr.index, 1); |
| arr_index = nir_umin(b, arr_index, nir_imm_int(b, arr_size - 1)); |
| nir_ssa_def *arr_offset = nir_amul_imm(b, arr_index, array_elements); |
| if (nonconst_index) |
| nonconst_index = nir_iadd(b, nonconst_index, arr_offset); |
| else |
| nonconst_index = arr_offset; |
| |
| /* We're walking the deref from the tail so prepend the array index */ |
| block_name = ralloc_asprintf(b->shader, "[0]%s", block_name); |
| } |
| |
| array_elements *= arr_size; |
| deref = parent; |
| } |
| |
| assert(deref->deref_type == nir_deref_type_var); |
| binding += deref->var->data.binding; |
| block_name = ralloc_asprintf(b->shader, "%s%s", |
| glsl_get_type_name(deref->var->interface_type), |
| block_name); |
| |
| struct gl_linked_shader *linked_shader = |
| shader_program->_LinkedShaders[b->shader->info.stage]; |
| |
| unsigned num_blocks; |
| struct gl_uniform_block **blocks; |
| if (deref->mode == nir_var_mem_ubo) { |
| num_blocks = linked_shader->Program->info.num_ubos; |
| blocks = linked_shader->Program->sh.UniformBlocks; |
| } else { |
| assert(deref->mode == nir_var_mem_ssbo); |
| num_blocks = linked_shader->Program->info.num_ssbos; |
| blocks = linked_shader->Program->sh.ShaderStorageBlocks; |
| } |
| |
| /* Block names are optional with ARB_gl_spirv so use the binding instead. */ |
| bool use_bindings = shader_program->data->spirv; |
| |
| for (unsigned i = 0; i < num_blocks; i++) { |
| if (( use_bindings && binding == blocks[i]->Binding) || |
| (!use_bindings && strcmp(block_name, blocks[i]->Name) == 0)) { |
| if (nonconst_index) |
| return nir_iadd_imm(b, nonconst_index, i); |
| else |
| return nir_imm_int(b, i); |
| } |
| } |
| |
| /* TODO: Investigate if we could change the code to assign Bindings to the |
| * blocks that were not explicitly assigned, so we can always compare |
| * bindings. |
| */ |
| |
| if (use_bindings) |
| unreachable("Failed to find the block by binding"); |
| else |
| unreachable("Failed to find the block by name"); |
| } |
| |
| static void |
| get_block_index_offset(nir_variable *var, |
| const struct gl_shader_program *shader_program, |
| gl_shader_stage stage, |
| unsigned *index, unsigned *offset) |
| { |
| |
| struct gl_linked_shader *linked_shader = |
| shader_program->_LinkedShaders[stage]; |
| |
| unsigned num_blocks; |
| struct gl_uniform_block **blocks; |
| if (var->data.mode == nir_var_mem_ubo) { |
| num_blocks = linked_shader->Program->info.num_ubos; |
| blocks = linked_shader->Program->sh.UniformBlocks; |
| } else { |
| assert(var->data.mode == nir_var_mem_ssbo); |
| num_blocks = linked_shader->Program->info.num_ssbos; |
| blocks = linked_shader->Program->sh.ShaderStorageBlocks; |
| } |
| |
| /* Block names are optional with ARB_gl_spirv so use the binding instead. */ |
| bool use_bindings = shader_program->data->spirv; |
| |
| for (unsigned i = 0; i < num_blocks; i++) { |
| const char *block_name = glsl_get_type_name(var->interface_type); |
| if (( use_bindings && blocks[i]->Binding == var->data.binding) || |
| (!use_bindings && strcmp(block_name, blocks[i]->Name) == 0)) { |
| *index = i; |
| *offset = blocks[i]->Uniforms[var->data.location].Offset; |
| return; |
| } |
| } |
| |
| if (use_bindings) |
| unreachable("Failed to find the block by binding"); |
| else |
| unreachable("Failed to find the block by name"); |
| } |
| |
| static bool |
| lower_buffer_interface_derefs_impl(nir_function_impl *impl, |
| const struct gl_shader_program *shader_program) |
| { |
| bool progress = false; |
| |
| nir_builder b; |
| nir_builder_init(&b, impl); |
| |
| nir_foreach_block(block, impl) { |
| nir_foreach_instr_safe(instr, block) { |
| switch (instr->type) { |
| case nir_instr_type_deref: { |
| nir_deref_instr *deref = nir_instr_as_deref(instr); |
| if (!(deref->mode & (nir_var_mem_ubo | nir_var_mem_ssbo))) |
| break; |
| |
| /* We use nir_address_format_32bit_index_offset */ |
| assert(deref->dest.is_ssa); |
| assert(deref->dest.ssa.bit_size == 32); |
| deref->dest.ssa.num_components = 2; |
| |
| progress = true; |
| |
| b.cursor = nir_before_instr(&deref->instr); |
| |
| nir_ssa_def *ptr; |
| if (deref->deref_type == nir_deref_type_var && |
| !glsl_type_is_interface(glsl_without_array(deref->var->type))) { |
| /* This variable is contained in an interface block rather than |
| * containing one. We need the block index and its offset |
| * inside that block |
| */ |
| unsigned index, offset; |
| get_block_index_offset(deref->var, shader_program, |
| b.shader->info.stage, |
| &index, &offset); |
| ptr = nir_imm_ivec2(&b, index, offset); |
| } else if (glsl_type_is_interface(deref->type)) { |
| /* This is the last deref before the block boundary. |
| * Everything after this point is a byte offset and will be |
| * handled by nir_lower_explicit_io(). |
| */ |
| nir_ssa_def *index = get_block_array_index(&b, deref, |
| shader_program); |
| ptr = nir_vec2(&b, index, nir_imm_int(&b, 0)); |
| } else { |
| /* This will get handled by nir_lower_explicit_io(). */ |
| break; |
| } |
| |
| nir_deref_instr *cast = nir_build_deref_cast(&b, ptr, deref->mode, |
| deref->type, 0); |
| nir_ssa_def_rewrite_uses(&deref->dest.ssa, |
| nir_src_for_ssa(&cast->dest.ssa)); |
| nir_deref_instr_remove_if_unused(deref); |
| break; |
| } |
| |
| case nir_instr_type_intrinsic: { |
| nir_intrinsic_instr *intrin = nir_instr_as_intrinsic(instr); |
| switch (intrin->intrinsic) { |
| case nir_intrinsic_load_deref: { |
| nir_deref_instr *deref = nir_src_as_deref(intrin->src[0]); |
| if (!(deref->mode & (nir_var_mem_ubo | nir_var_mem_ssbo))) |
| break; |
| |
| /* UBO and SSBO Booleans are 32-bit integers where any non-zero |
| * value is considered true. NIR Booleans, on the other hand |
| * are 1-bit values until you get to a very late stage of the |
| * compilation process. We need to turn those 1-bit loads into |
| * a 32-bit load wrapped in an i2b to get a proper NIR boolean |
| * from the SSBO. |
| */ |
| if (glsl_type_is_boolean(deref->type)) { |
| assert(intrin->dest.is_ssa); |
| b.cursor = nir_after_instr(&intrin->instr); |
| intrin->dest.ssa.bit_size = 32; |
| nir_ssa_def *bval = nir_i2b(&b, &intrin->dest.ssa); |
| nir_ssa_def_rewrite_uses_after(&intrin->dest.ssa, |
| nir_src_for_ssa(bval), |
| bval->parent_instr); |
| progress = true; |
| } |
| break; |
| } |
| |
| case nir_intrinsic_store_deref: { |
| nir_deref_instr *deref = nir_src_as_deref(intrin->src[0]); |
| if (!(deref->mode & (nir_var_mem_ubo | nir_var_mem_ssbo))) |
| break; |
| |
| /* SSBO Booleans are 32-bit integers where any non-zero value |
| * is considered true. NIR Booleans, on the other hand are |
| * 1-bit values until you get to a very late stage of the |
| * compilation process. We need to turn those 1-bit stores |
| * into a b2i32 followed by a 32-bit store. Technically the |
| * value we write doesn't have to be 0/1 so once Booleans are |
| * lowered to 32-bit values, we have an unneeded sanitation |
| * step but in practice it doesn't cost much. |
| */ |
| if (glsl_type_is_boolean(deref->type)) { |
| assert(intrin->src[1].is_ssa); |
| b.cursor = nir_before_instr(&intrin->instr); |
| nir_ssa_def *ival = nir_b2i32(&b, intrin->src[1].ssa); |
| nir_instr_rewrite_src(&intrin->instr, &intrin->src[1], |
| nir_src_for_ssa(ival)); |
| progress = true; |
| } |
| break; |
| } |
| |
| case nir_intrinsic_copy_deref: |
| unreachable("copy_deref should be lowered by now"); |
| break; |
| |
| default: |
| /* Nothing to do */ |
| break; |
| } |
| break; |
| } |
| |
| default: |
| break; /* Nothing to do */ |
| } |
| } |
| } |
| |
| if (progress) { |
| nir_metadata_preserve(impl, nir_metadata_block_index | |
| nir_metadata_dominance); |
| } |
| |
| return progress; |
| } |
| |
| bool |
| gl_nir_lower_buffers(nir_shader *shader, |
| const struct gl_shader_program *shader_program) |
| { |
| bool progress = false; |
| |
| /* First, we lower the derefs to turn block variable and array derefs into |
| * a nir_address_format_32bit_index_offset pointer. From there forward, |
| * we leave the derefs in place and let nir_lower_explicit_io handle them. |
| */ |
| nir_foreach_function(function, shader) { |
| if (function->impl && |
| lower_buffer_interface_derefs_impl(function->impl, shader_program)) |
| progress = true; |
| } |
| |
| /* If that did something, we validate and then call nir_lower_explicit_io |
| * to finish the process. |
| */ |
| if (progress) { |
| nir_validate_shader(shader, "Lowering buffer interface derefs"); |
| nir_lower_explicit_io(shader, nir_var_mem_ubo | nir_var_mem_ssbo, |
| nir_address_format_32bit_index_offset); |
| } |
| |
| return progress; |
| } |
