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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 "compiler/nir/nir.h"
#include "compiler/nir/nir_builder.h"
#include "gl_nir.h"
#include "ir_uniform.h"
#include "main/compiler.h"
#include "main/mtypes.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_builder *b, nir_ssa_def *ptr,
const struct gl_shader_program *shader_program,
unsigned *base_index, nir_ssa_def **index,
unsigned *array_elements)
{
*base_index = 0;
*index = NULL;
*array_elements = 1;
unsigned location = 0;
nir_deref_instr *deref = nir_instr_as_deref(ptr->parent_instr);
while (deref->deref_type != nir_deref_type_var) {
assert(deref->parent.is_ssa);
nir_deref_instr *parent =
nir_instr_as_deref(deref->parent.ssa->parent_instr);
switch (deref->deref_type) {
case nir_deref_type_struct:
location += glsl_get_record_location_offset(parent->type,
deref->strct.index);
break;
case nir_deref_type_array: {
nir_const_value *const_deref_index =
nir_src_as_const_value(deref->arr.index);
if (const_deref_index && *index == NULL) {
/* We're still building a direct index */
*base_index += const_deref_index->u32[0] * *array_elements;
} else {
if (*index == NULL) {
/* We used to be direct but not anymore */
*index = nir_imm_int(b, *base_index);
*base_index = 0;
}
*index = nir_iadd(b, *index,
nir_imul(b, nir_imm_int(b, *array_elements),
nir_ssa_for_src(b, deref->arr.index, 1)));
}
*array_elements *= glsl_get_length(parent->type);
break;
}
default:
unreachable("Invalid sampler deref type");
}
deref = parent;
}
if (*index)
*index = nir_umin(b, *index, nir_imm_int(b, *array_elements - 1));
/* We hit the deref_var. This is the end of the line */
assert(deref->deref_type == nir_deref_type_var);
location += deref->var->data.location;
gl_shader_stage stage = b->shader->info.stage;
assert(location < shader_program->data->NumUniformStorage &&
shader_program->data->UniformStorage[location].opaque[stage].active);
*base_index +=
shader_program->data->UniformStorage[location].opaque[stage].index;
}
static bool
lower_sampler(nir_builder *b, nir_tex_instr *instr,
const struct gl_shader_program *shader_program)
{
int texture_idx =
nir_tex_instr_src_index(instr, nir_tex_src_texture_deref);
int sampler_idx =
nir_tex_instr_src_index(instr, nir_tex_src_sampler_deref);
if (texture_idx < 0)
return false;
assert(texture_idx >= 0 && sampler_idx >= 0);
assert(instr->src[texture_idx].src.is_ssa);
assert(instr->src[sampler_idx].src.is_ssa);
assert(instr->src[texture_idx].src.ssa == instr->src[sampler_idx].src.ssa);
b->cursor = nir_before_instr(&instr->instr);
unsigned base_offset, array_elements;
nir_ssa_def *indirect;
calc_sampler_offsets(b, instr->src[texture_idx].src.ssa, shader_program,
&base_offset, &indirect, &array_elements);
instr->texture_index = base_offset;
instr->sampler_index = base_offset;
if (indirect) {
nir_instr_rewrite_src(&instr->instr, &instr->src[texture_idx].src,
nir_src_for_ssa(indirect));
instr->src[texture_idx].src_type = nir_tex_src_texture_offset;
nir_instr_rewrite_src(&instr->instr, &instr->src[sampler_idx].src,
nir_src_for_ssa(indirect));
instr->src[sampler_idx].src_type = nir_tex_src_sampler_offset;
instr->texture_array_size = array_elements;
} else {
nir_tex_instr_remove_src(instr, texture_idx);
/* The sampler index may have changed */
sampler_idx = nir_tex_instr_src_index(instr, nir_tex_src_sampler_deref);
nir_tex_instr_remove_src(instr, sampler_idx);
}
return true;
}
static bool
lower_impl(nir_function_impl *impl,
const struct gl_shader_program *shader_program)
{
nir_builder b;
nir_builder_init(&b, impl);
bool progress = false;
nir_foreach_block(block, impl) {
nir_foreach_instr(instr, block) {
if (instr->type == nir_instr_type_tex)
progress |= lower_sampler(&b, nir_instr_as_tex(instr),
shader_program);
}
}
return progress;
}
bool
gl_nir_lower_samplers(nir_shader *shader,
const struct gl_shader_program *shader_program)
{
bool progress = false;
nir_foreach_function(function, shader) {
if (function->impl)
progress |= lower_impl(function->impl, shader_program);
}
return progress;
}
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