179 lines
5.7 KiB
C
179 lines
5.7 KiB
C
/*
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* Copyright (C) 2005-2007 Brian Paul All Rights Reserved.
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* Copyright (C) 2008 VMware, Inc. All Rights Reserved.
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* Copyright © 2014 Intel Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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#include "nir/nir.h"
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#include "nir_builder.h"
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static void
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lower_tex_src_to_offset(nir_builder *b,
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nir_tex_instr *instr, unsigned src_idx)
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{
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nir_ssa_def *index = NULL;
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unsigned base_index = 0;
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unsigned array_elements = 1;
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nir_tex_src *src = &instr->src[src_idx];
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bool is_sampler = src->src_type == nir_tex_src_sampler_deref;
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/* We compute first the offsets */
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nir_deref_instr *deref = nir_instr_as_deref(src->src.ssa->parent_instr);
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while (deref->deref_type != nir_deref_type_var) {
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assert(deref->parent.is_ssa);
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nir_deref_instr *parent =
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nir_instr_as_deref(deref->parent.ssa->parent_instr);
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assert(deref->deref_type == nir_deref_type_array);
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if (nir_src_is_const(deref->arr.index) && index == NULL) {
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/* We're still building a direct index */
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unsigned index_in_array = nir_src_as_uint(deref->arr.index);
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/* Section 5.11 (Out-of-Bounds Accesses) of the GLSL 4.60 spec says:
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*
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* In the subsections described above for array, vector, matrix and
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* structure accesses, any out-of-bounds access produced undefined
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* behavior.... Out-of-bounds reads return undefined values, which
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* include values from other variables of the active program or zero.
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*
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* Robustness extensions suggest to return zero on out-of-bounds
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* accesses, however it's not applicable to the arrays of samplers,
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* so just clamp the index.
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*
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* Otherwise instr->sampler_index or instr->texture_index would be out
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* of bounds, and they are used as an index to arrays of driver state.
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*/
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if (index_in_array < glsl_array_size(parent->type)) {
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base_index += index_in_array * array_elements;
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} else {
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base_index = glsl_array_size(parent->type) - 1;
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}
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} else {
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if (index == NULL) {
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/* We used to be direct but not anymore */
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index = nir_imm_int(b, base_index);
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base_index = 0;
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}
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index = nir_iadd(b, index,
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nir_imul(b, nir_imm_int(b, array_elements),
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nir_ssa_for_src(b, deref->arr.index, 1)));
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}
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array_elements *= glsl_get_length(parent->type);
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deref = parent;
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}
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if (index)
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index = nir_umin(b, index, nir_imm_int(b, array_elements - 1));
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/* We hit the deref_var. This is the end of the line */
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assert(deref->deref_type == nir_deref_type_var);
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base_index += deref->var->data.binding;
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/* We have the offsets, we apply them, rewriting the source or removing
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* instr if needed
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*/
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if (index) {
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nir_instr_rewrite_src(&instr->instr, &src->src,
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nir_src_for_ssa(index));
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src->src_type = is_sampler ?
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nir_tex_src_sampler_offset :
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nir_tex_src_texture_offset;
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} else {
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nir_tex_instr_remove_src(instr, src_idx);
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}
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if (is_sampler) {
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instr->sampler_index = base_index;
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} else {
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instr->texture_index = base_index;
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}
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}
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static bool
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lower_sampler(nir_builder *b, nir_tex_instr *instr)
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{
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int texture_idx =
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nir_tex_instr_src_index(instr, nir_tex_src_texture_deref);
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if (texture_idx >= 0) {
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b->cursor = nir_before_instr(&instr->instr);
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lower_tex_src_to_offset(b, instr, texture_idx);
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}
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int sampler_idx =
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nir_tex_instr_src_index(instr, nir_tex_src_sampler_deref);
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if (sampler_idx >= 0) {
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lower_tex_src_to_offset(b, instr, sampler_idx);
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}
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if (texture_idx < 0 && sampler_idx < 0)
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return false;
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return true;
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}
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static bool
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lower_impl(nir_function_impl *impl)
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{
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nir_builder b;
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nir_builder_init(&b, impl);
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bool progress = false;
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nir_foreach_block(block, impl) {
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nir_foreach_instr(instr, block) {
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if (instr->type == nir_instr_type_tex)
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progress |= lower_sampler(&b, nir_instr_as_tex(instr));
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}
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}
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if (progress) {
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nir_metadata_preserve(impl, nir_metadata_block_index |
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nir_metadata_dominance);
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} else {
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nir_metadata_preserve(impl, nir_metadata_all);
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}
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return progress;
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}
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bool
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nir_lower_samplers(nir_shader *shader)
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{
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bool progress = false;
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/* Next, lower derefs to offsets. */
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nir_foreach_function(function, shader) {
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if (function->impl)
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progress |= lower_impl(function->impl);
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}
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return progress;
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}
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