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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 "../program.h"
#include "program/hash_table.h"
#include "ir_uniform.h"
extern "C" {
#include "main/compiler.h"
#include "main/mtypes.h"
#include "program/prog_parameter.h"
#include "program/program.h"
}
static void
add_indirect_to_tex(nir_tex_instr *instr, nir_src 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,
indirect);
}
static unsigned
get_sampler_index(const struct gl_shader_program *shader_program,
gl_shader_stage stage, const char *name)
{
unsigned location;
if (!shader_program->UniformHash->get(location, name)) {
assert(!"failed to find sampler");
return 0;
}
if (!shader_program->UniformStorage[location].sampler[stage].active) {
assert(!"cannot return a sampler");
return 0;
}
return shader_program->UniformStorage[location].sampler[stage].index;
}
static void
lower_sampler(nir_tex_instr *instr, const struct gl_shader_program *shader_program,
gl_shader_stage stage, void *mem_ctx)
{
if (instr->sampler == NULL)
return;
/* Get the name and the offset */
instr->sampler_index = 0;
char *name = ralloc_strdup(mem_ctx, instr->sampler->var->name);
for (nir_deref *deref = &instr->sampler->deref;
deref->child; deref = deref->child) {
switch (deref->child->deref_type) {
case nir_deref_type_array: {
nir_deref_array *deref_array = nir_deref_as_array(deref->child);
assert(deref_array->deref_array_type != nir_deref_array_type_wildcard);
if (deref_array->deref.child) {
ralloc_asprintf_append(&name, "[%u]",
deref_array->deref_array_type == nir_deref_array_type_direct ?
deref_array->base_offset : 0);
} else {
assert(deref->child->type->base_type == GLSL_TYPE_SAMPLER);
instr->sampler_index = deref_array->base_offset;
}
/* XXX: We're assuming here that the indirect is the last array
* thing we have. This should be ok for now as we don't support
* arrays_of_arrays yet.
*/
if (deref_array->deref_array_type == nir_deref_array_type_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_move_src(&instr->instr,
&instr->src[instr->num_srcs - 1].src,
&deref_array->indirect);
instr->sampler_array_size = glsl_get_length(deref->type);
}
break;
}
case nir_deref_type_struct: {
nir_deref_struct *deref_struct = nir_deref_as_struct(deref->child);
const char *field = glsl_get_struct_elem_name(deref->type,
deref_struct->index);
ralloc_asprintf_append(&name, ".%s", field);
break;
}
default:
unreachable("Invalid deref type");
break;
}
}
instr->sampler_index += get_sampler_index(shader_program, stage, name);
instr->sampler = NULL;
}
typedef struct {
void *mem_ctx;
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->mem_ctx);
}
}
return true;
}
static void
lower_impl(nir_function_impl *impl, const struct gl_shader_program *shader_program,
gl_shader_stage stage)
{
lower_state state;
state.mem_ctx = ralloc_parent(impl);
state.shader_program = shader_program;
state.stage = stage;
nir_foreach_block(impl, lower_block_cb, &state);
}
extern "C" void
nir_lower_samplers(nir_shader *shader,
const struct gl_shader_program *shader_program)
{
nir_foreach_overload(shader, overload) {
if (overload->impl)
lower_impl(overload->impl, shader_program, shader->stage);
}
}
static bool
lower_samplers_for_vk_block(nir_block *block, void *data)
{
nir_foreach_instr(block, instr) {
if (instr->type != nir_instr_type_tex)
continue;
nir_tex_instr *tex = nir_instr_as_tex(instr);
assert(tex->sampler);
tex->sampler_set = tex->sampler->var->data.descriptor_set;
tex->sampler_index = tex->sampler->var->data.binding;
if (tex->sampler->deref.child) {
assert(tex->sampler->deref.child->deref_type == nir_deref_type_array);
nir_deref_array *arr = nir_deref_as_array(tex->sampler->deref.child);
/* Only one-level arrays are allowed in vulkan */
assert(arr->deref.child == NULL);
tex->sampler_index += arr->base_offset;
if (arr->deref_array_type == nir_deref_array_type_indirect) {
add_indirect_to_tex(tex, arr->indirect);
nir_instr_rewrite_src(instr, &arr->indirect, NIR_SRC_INIT);
tex->sampler_array_size = glsl_get_length(tex->sampler->deref.type);
}
}
tex->sampler = NULL;
}
return true;
}
extern "C" void
nir_lower_samplers_for_vk(nir_shader *shader)
{
nir_foreach_overload(shader, overload) {
if (overload->impl) {
nir_foreach_block(overload->impl, lower_samplers_for_vk_block, NULL);
}
}
}
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