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/*
* 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 "compiler/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->texture_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 *b)
{
if (instr->texture == NULL)
return;
/* In GLSL, we only fill out the texture field. The sampler is inferred */
assert(instr->sampler == NULL);
instr->texture_index = 0;
unsigned location = instr->texture->var->data.location;
unsigned array_elements = 1;
nir_ssa_def *indirect = NULL;
b->cursor = nir_before_instr(&instr->instr);
calc_sampler_offsets(&instr->texture->deref, instr, &array_elements,
&indirect, b, &location);
if (indirect) {
assert(array_elements >= 1);
indirect = nir_umin(b, indirect, nir_imm_int(b, array_elements - 1));
/* First, we have to resize the array of texture sources */
nir_tex_src *new_srcs = rzalloc_array(instr, nir_tex_src,
instr->num_srcs + 2);
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_texture_offset;
instr->num_srcs++;
nir_instr_rewrite_src(&instr->instr,
&instr->src[instr->num_srcs - 1].src,
nir_src_for_ssa(indirect));
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->texture_array_size = array_elements;
}
if (location > shader_program->NumUniformStorage - 1 ||
!shader_program->UniformStorage[location].opaque[stage].active) {
assert(!"cannot return a sampler");
return;
}
instr->texture_index +=
shader_program->UniformStorage[location].opaque[stage].index;
instr->sampler_index = instr->texture_index;
instr->texture = NULL;
}
static void
lower_impl(nir_function_impl *impl, const struct gl_shader_program *shader_program,
gl_shader_stage stage)
{
nir_builder b;
nir_builder_init(&b, impl);
nir_foreach_block(block, impl) {
nir_foreach_instr(instr, block) {
if (instr->type == nir_instr_type_tex)
lower_sampler(nir_instr_as_tex(instr), shader_program, stage, &b);
}
}
}
void
nir_lower_samplers(nir_shader *shader,
const struct gl_shader_program *shader_program)
{
nir_foreach_function(function, shader) {
if (function->impl)
lower_impl(function->impl, shader_program, shader->stage);
}
}
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