diff options
Diffstat (limited to 'src/compiler/nir/nir_lower_samplers.c')
| -rw-r--r-- | src/compiler/nir/nir_lower_samplers.c | 187 |
1 files changed, 187 insertions, 0 deletions
diff --git a/src/compiler/nir/nir_lower_samplers.c b/src/compiler/nir/nir_lower_samplers.c new file mode 100644 index 00000000000..9c912129f09 --- /dev/null +++ b/src/compiler/nir/nir_lower_samplers.c @@ -0,0 +1,187 @@ +/* + * Copyright (C) 2005-2007 Brian Paul All Rights Reserved. + * Copyright (C) 2008 VMware, Inc. All Rights Reserved. + * Copyright © 2014 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 "nir.h" +#include "nir_builder.h" +#include "program/hash_table.h" +#include "glsl/ir_uniform.h" + +#include "main/compiler.h" +#include "main/mtypes.h" +#include "program/prog_parameter.h" +#include "program/program.h" + +/* Calculate the sampler index based on array indicies and also + * calculate the base uniform location for struct members. + */ +static void +calc_sampler_offsets(nir_deref *tail, nir_tex_instr *instr, + unsigned *array_elements, nir_ssa_def **indirect, + nir_builder *b, unsigned *location) +{ + if (tail->child == NULL) + return; + + switch (tail->child->deref_type) { + case nir_deref_type_array: { + nir_deref_array *deref_array = nir_deref_as_array(tail->child); + + assert(deref_array->deref_array_type != nir_deref_array_type_wildcard); + + calc_sampler_offsets(tail->child, instr, array_elements, + indirect, b, location); + instr->sampler_index += deref_array->base_offset * *array_elements; + + if (deref_array->deref_array_type == nir_deref_array_type_indirect) { + nir_ssa_def *mul = + nir_imul(b, nir_imm_int(b, *array_elements), + nir_ssa_for_src(b, deref_array->indirect, 1)); + + nir_instr_rewrite_src(&instr->instr, &deref_array->indirect, + NIR_SRC_INIT); + + if (*indirect) { + *indirect = nir_iadd(b, *indirect, mul); + } else { + *indirect = mul; + } + } + + *array_elements *= glsl_get_length(tail->type); + break; + } + + case nir_deref_type_struct: { + nir_deref_struct *deref_struct = nir_deref_as_struct(tail->child); + *location += glsl_get_record_location_offset(tail->type, deref_struct->index); + calc_sampler_offsets(tail->child, instr, array_elements, + indirect, b, location); + break; + } + + default: + unreachable("Invalid deref type"); + break; + } +} + +static void +lower_sampler(nir_tex_instr *instr, const struct gl_shader_program *shader_program, + gl_shader_stage stage, nir_builder *builder) +{ + if (instr->sampler == NULL) + return; + + instr->sampler_index = 0; + unsigned location = instr->sampler->var->data.location; + unsigned array_elements = 1; + nir_ssa_def *indirect = NULL; + + builder->cursor = nir_before_instr(&instr->instr); + calc_sampler_offsets(&instr->sampler->deref, instr, &array_elements, + &indirect, builder, &location); + + if (indirect) { + /* First, we have to resize the array of texture sources */ + nir_tex_src *new_srcs = rzalloc_array(instr, nir_tex_src, + instr->num_srcs + 1); + + for (unsigned i = 0; i < instr->num_srcs; i++) { + new_srcs[i].src_type = instr->src[i].src_type; + nir_instr_move_src(&instr->instr, &new_srcs[i].src, + &instr->src[i].src); + } + + ralloc_free(instr->src); + instr->src = new_srcs; + + /* Now we can go ahead and move the source over to being a + * first-class texture source. + */ + instr->src[instr->num_srcs].src_type = nir_tex_src_sampler_offset; + instr->num_srcs++; + nir_instr_rewrite_src(&instr->instr, + &instr->src[instr->num_srcs - 1].src, + nir_src_for_ssa(indirect)); + + instr->sampler_array_size = array_elements; + } + + if (location > shader_program->NumUniformStorage - 1 || + !shader_program->UniformStorage[location].opaque[stage].active) { + assert(!"cannot return a sampler"); + return; + } + + instr->sampler_index += + shader_program->UniformStorage[location].opaque[stage].index; + + instr->sampler = NULL; +} + +typedef struct { + nir_builder builder; + const struct gl_shader_program *shader_program; + gl_shader_stage stage; +} lower_state; + +static bool +lower_block_cb(nir_block *block, void *_state) +{ + lower_state *state = (lower_state *) _state; + + nir_foreach_instr(block, instr) { + if (instr->type == nir_instr_type_tex) { + nir_tex_instr *tex_instr = nir_instr_as_tex(instr); + lower_sampler(tex_instr, state->shader_program, state->stage, + &state->builder); + } + } + + return true; +} + +static void +lower_impl(nir_function_impl *impl, const struct gl_shader_program *shader_program, + gl_shader_stage stage) +{ + lower_state state; + + nir_builder_init(&state.builder, impl); + state.shader_program = shader_program; + state.stage = stage; + + nir_foreach_block(impl, lower_block_cb, &state); +} + +void +nir_lower_samplers(nir_shader *shader, + const struct gl_shader_program *shader_program) +{ + nir_foreach_function(shader, function) { + if (function->impl) + lower_impl(function->impl, shader_program, shader->stage); + } +} |