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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 unsigned
get_deref_name_offset(nir_deref_var *deref_var,
gl_shader_program *shader_program, char **name,
void *mem_ctx)
{
nir_deref *deref = &deref_var->deref;
nir_deref_array *deref_array;
nir_deref_struct *deref_struct;
*name = ralloc_strdup(mem_ctx, deref_var->var->name);
while (deref->child != NULL) {
switch (deref->child->deref_type) {
case nir_deref_type_array:
deref_array = nir_deref_as_array(deref->child);
if (deref_array->deref_array_type == nir_deref_array_type_indirect) {
/* GLSL 1.10 and 1.20 allowed variable sampler array indices,
* while GLSL 1.30 requires that the array indices be
* constant integer expressions. We don't expect any driver
* to actually work with a really variable array index, so
* all that would work would be an unrolled loop counter that
* ends up being constant.
*/
ralloc_strcat(&shader_program->InfoLog,
"warning: Variable sampler array index unsupported.\n"
"This feature of the language was removed in GLSL 1.20 "
"and is unlikely to be supported for 1.10 in Mesa.\n");
}
if (deref_array->deref.child == NULL) {
return deref_array->base_offset;
}
ralloc_asprintf_append(name, "[%u]", deref_array->base_offset);
break;
case nir_deref_type_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:
assert(0);
break;
}
deref = deref->child;
}
return 0;
}
static unsigned
get_sampler_index(nir_deref_var *sampler,
struct gl_shader_program *shader_program,
const struct gl_program *prog)
{
void *mem_ctx = ralloc_context(NULL);
char *name;
unsigned offset = get_deref_name_offset(sampler, shader_program, &name,
mem_ctx);
GLuint shader = _mesa_program_enum_to_shader_stage(prog->Target);
unsigned location;
if (!shader_program->UniformHash->get(location, name)) {
linker_error(shader_program,
"failed to find sampler named %s.\n", name);
return 0;
}
if (!shader_program->UniformStorage[location].sampler[shader].active) {
assert(0 && "cannot return a sampler");
linker_error(shader_program,
"cannot return a sampler named %s, because it is not "
"used in this shader stage. This is a driver bug.\n",
name);
return 0;
}
ralloc_free(mem_ctx);
return shader_program->UniformStorage[location].sampler[shader].index +
offset;
}
static void
lower_sampler(nir_tex_instr *instr, struct gl_shader_program *shader_program,
const struct gl_program *prog)
{
if (instr->sampler) {
instr->sampler_index = get_sampler_index(instr->sampler, shader_program,
prog);
nir_src empty_src;
memset(&empty_src, 0, sizeof empty_src);
for (nir_deref *deref = &instr->sampler->deref; deref; deref = deref->child) {
if (deref->deref_type == nir_deref_type_array) {
nir_deref_array *arr = nir_deref_as_array(deref);
nir_instr_rewrite_src(&instr->instr, &arr->indirect, empty_src);
}
}
instr->sampler = NULL;
}
}
typedef struct {
struct gl_shader_program *shader_program;
struct gl_program *prog;
} 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->prog);
}
}
return true;
}
static void
lower_impl(nir_function_impl *impl, struct gl_shader_program *shader_program,
struct gl_program *prog)
{
lower_state state;
state.shader_program = shader_program;
state.prog = prog;
nir_foreach_block(impl, lower_block_cb, &state);
}
extern "C" void
nir_lower_samplers(nir_shader *shader, struct gl_shader_program *shader_program,
struct gl_program *prog)
{
nir_foreach_overload(shader, overload) {
if (overload->impl)
lower_impl(overload->impl, shader_program, prog);
}
}
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