diff options
Diffstat (limited to 'src/compiler/nir/nir_lower_uniforms_to_ubo.c')
| -rw-r--r-- | src/compiler/nir/nir_lower_uniforms_to_ubo.c | 98 |
1 files changed, 98 insertions, 0 deletions
diff --git a/src/compiler/nir/nir_lower_uniforms_to_ubo.c b/src/compiler/nir/nir_lower_uniforms_to_ubo.c new file mode 100644 index 00000000000..b54c9943ab7 --- /dev/null +++ b/src/compiler/nir/nir_lower_uniforms_to_ubo.c @@ -0,0 +1,98 @@ +/* + * Copyright 2017 Advanced Micro Devices, Inc. + * + * 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. + */ + +/* + * Remap load_uniform intrinsics to UBO accesses of UBO binding point 0. Both + * the base and the offset are interpreted as 16-byte units. + * + * Simultaneously, remap existing UBO accesses by increasing their binding + * point by 1. + */ + +#include "nir.h" +#include "nir_builder.h" + +static bool +lower_instr(nir_intrinsic_instr *instr, nir_builder *b) +{ + b->cursor = nir_before_instr(&instr->instr); + + if (instr->intrinsic == nir_intrinsic_load_ubo) { + nir_ssa_def *old_idx = nir_ssa_for_src(b, instr->src[0], 1); + nir_ssa_def *new_idx = nir_iadd(b, old_idx, nir_imm_int(b, 1)); + nir_instr_rewrite_src(&instr->instr, &instr->src[0], + nir_src_for_ssa(new_idx)); + return true; + } + + if (instr->intrinsic == nir_intrinsic_load_uniform) { + nir_ssa_def *ubo_idx = nir_imm_int(b, 0); + nir_ssa_def *ubo_offset = + nir_iadd(b, nir_imm_int(b, 4 * nir_intrinsic_base(instr)), + nir_imul(b, nir_imm_int(b, 4), + nir_ssa_for_src(b, instr->src[0], 1))); + + nir_intrinsic_instr *load = + nir_intrinsic_instr_create(b->shader, nir_intrinsic_load_ubo); + load->num_components = instr->num_components; + load->src[0] = nir_src_for_ssa(ubo_idx); + load->src[1] = nir_src_for_ssa(ubo_offset); + nir_ssa_dest_init(&load->instr, &load->dest, + load->num_components, instr->dest.ssa.bit_size, + instr->dest.ssa.name); + nir_builder_instr_insert(b, &load->instr); + nir_ssa_def_rewrite_uses(&instr->dest.ssa, nir_src_for_ssa(&load->dest.ssa)); + + nir_instr_remove(&instr->instr); + return true; + } + + return false; +} + +bool +nir_lower_uniforms_to_ubo(nir_shader *shader) +{ + bool progress = false; + + nir_foreach_function(function, shader) { + if (function->impl) { + nir_builder builder; + nir_builder_init(&builder, function->impl); + nir_foreach_block(block, function->impl) { + nir_foreach_instr_safe(instr, block) { + if (instr->type == nir_instr_type_intrinsic) + progress |= lower_instr(nir_instr_as_intrinsic(instr), + &builder); + } + } + + nir_metadata_preserve(function->impl, nir_metadata_block_index | + nir_metadata_dominance); + } + } + + return progress; +} + + |