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/*
* Copyright (C) 2005-2007 Brian Paul All Rights Reserved.
* Copyright (C) 2008 VMware, Inc. All Rights Reserved.
* Copyright © 2010 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 "main/mtypes.h"
#include "compiler/glsl_types.h"
#include "glsl/ir.h"
#include "glsl/ir_uniform.h"
#include "glsl/ir_visitor.h"
#include "glsl/program.h"
#include "program/hash_table.h"
#include "program/prog_parameter.h"
#include "program/program.h"
class get_sampler_name : public ir_hierarchical_visitor
{
public:
get_sampler_name(ir_dereference *last,
struct gl_shader_program *shader_program)
{
this->mem_ctx = ralloc_context(NULL);
this->shader_program = shader_program;
this->name = NULL;
this->offset = 0;
this->last = last;
}
~get_sampler_name()
{
ralloc_free(this->mem_ctx);
}
virtual ir_visitor_status visit(ir_dereference_variable *ir)
{
this->name = ir->var->name;
return visit_continue;
}
virtual ir_visitor_status visit_leave(ir_dereference_record *ir)
{
this->name = ralloc_asprintf(mem_ctx, "%s.%s", name, ir->field);
return visit_continue;
}
virtual ir_visitor_status visit_leave(ir_dereference_array *ir)
{
ir_constant *index = ir->array_index->as_constant();
int i;
if (index) {
i = index->value.i[0];
} else {
/* 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 above.
*/
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");
i = 0;
}
if (ir != last) {
this->name = ralloc_asprintf(mem_ctx, "%s[%d]", name, i);
} else {
offset = i;
}
return visit_continue;
}
struct gl_shader_program *shader_program;
const char *name;
void *mem_ctx;
int offset;
ir_dereference *last;
};
int
_mesa_get_sampler_uniform_value(class ir_dereference *sampler,
struct gl_shader_program *shader_program,
const struct gl_program *prog)
{
get_sampler_name getname(sampler, shader_program);
GLuint shader = _mesa_program_enum_to_shader_stage(prog->Target);
sampler->accept(&getname);
unsigned location;
if (!shader_program->UniformHash->get(location, getname.name)) {
linker_error(shader_program,
"failed to find sampler named %s.\n", getname.name);
return 0;
}
if (!shader_program->UniformStorage[location].opaque[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",
getname.name);
return 0;
}
return shader_program->UniformStorage[location].opaque[shader].index +
getname.offset;
}
class ir_rvalue *
_mesa_get_sampler_array_nonconst_index(class ir_dereference *sampler)
{
ir_dereference_array *deref_arr = sampler->as_dereference_array();
if (!deref_arr || deref_arr->array_index->as_constant())
return NULL;
return deref_arr->array_index;
}
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