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/*
* 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 "glsl_parser_extras.h"
#include "glsl_symbol_table.h"
#include "ir.h"
#include "builtin_variables.h"
#ifndef Elements
#define Elements(x) (sizeof(x)/sizeof(*(x)))
#endif
static void
add_builtin_variable(const builtin_variable *proto, exec_list *instructions,
glsl_symbol_table *symtab)
{
/* Create a new variable declaration from the description supplied by
* the caller.
*/
const glsl_type *const type = symtab->get_type(proto->type);
assert(type != NULL);
ir_variable *var = new ir_variable(type, proto->name);
var->mode = proto->mode;
if (var->mode != ir_var_out)
var->read_only = true;
/* Once the variable is created an initialized, add it to the symbol table
* and add the declaration to the IR stream.
*/
instructions->push_tail(var);
symtab->add_variable(var->name, var);
}
static void
generate_110_vs_variables(exec_list *instructions,
glsl_symbol_table *symtab)
{
for (unsigned i = 0; i < Elements(builtin_core_vs_variables); i++) {
add_builtin_variable(& builtin_core_vs_variables[i],
instructions, symtab);
}
for (unsigned i = 0
; i < Elements(builtin_110_deprecated_vs_variables)
; i++) {
add_builtin_variable(& builtin_110_deprecated_vs_variables[i],
instructions, symtab);
}
/* FINISHME: Add support fo gl_TexCoord. The size of this array is
* FINISHME: implementation dependent based on the value of
* FINISHME: GL_MAX_TEXTURE_COORDS.
*/
}
static void
generate_120_vs_variables(exec_list *instructions,
glsl_symbol_table *symtab)
{
/* GLSL version 1.20 did not add any built-in variables in the vertex
* shader.
*/
generate_110_vs_variables(instructions, symtab);
}
static void
generate_130_vs_variables(exec_list *instructions,
glsl_symbol_table *symtab)
{
generate_120_vs_variables(instructions, symtab);
for (unsigned i = 0; i < Elements(builtin_130_vs_variables); i++) {
add_builtin_variable(& builtin_130_vs_variables[i],
instructions, symtab);
}
/* FINISHME: Add support fo gl_ClipDistance. The size of this array is
* FINISHME: implementation dependent based on the value of
* FINISHME: GL_MAX_CLIP_DISTANCES.
*/
}
static void
initialize_vs_variables(exec_list *instructions,
struct _mesa_glsl_parse_state *state)
{
switch (state->language_version) {
case 110:
generate_110_vs_variables(instructions, state->symbols);
break;
case 120:
generate_120_vs_variables(instructions, state->symbols);
break;
case 130:
generate_130_vs_variables(instructions, state->symbols);
break;
}
}
static void
generate_110_fs_variables(exec_list *instructions,
glsl_symbol_table *symtab)
{
for (unsigned i = 0; i < Elements(builtin_core_fs_variables); i++) {
add_builtin_variable(& builtin_core_fs_variables[i],
instructions, symtab);
}
/* FINISHME: Add support for gl_TexCoord[] */
for (unsigned i = 0
; i < Elements(builtin_110_deprecated_fs_variables)
; i++) {
add_builtin_variable(& builtin_110_deprecated_fs_variables[i],
instructions, symtab);
}
/* FINISHME: Add support for gl_FragData[GL_MAX_DRAW_BUFFERS]. */
}
static void
generate_120_fs_variables(exec_list *instructions,
glsl_symbol_table *symtab)
{
/* GLSL version 1.20 did not add any built-in variables in the fragment
* shader.
*/
generate_110_fs_variables(instructions, symtab);
}
static void
generate_130_fs_variables(exec_list *instructions,
glsl_symbol_table *symtab)
{
generate_120_fs_variables(instructions, symtab);
/* FINISHME: Add support fo gl_ClipDistance. The size of this array is
* FINISHME: implementation dependent based on the value of
* FINISHME: GL_MAX_CLIP_DISTANCES.
*/
}
static void
initialize_fs_variables(exec_list *instructions,
struct _mesa_glsl_parse_state *state)
{
switch (state->language_version) {
case 110:
generate_110_fs_variables(instructions, state->symbols);
break;
case 120:
generate_120_fs_variables(instructions, state->symbols);
break;
case 130:
generate_130_fs_variables(instructions, state->symbols);
break;
}
}
void
_mesa_glsl_initialize_variables(exec_list *instructions,
struct _mesa_glsl_parse_state *state)
{
switch (state->target) {
case vertex_shader:
initialize_vs_variables(instructions, state);
break;
case geometry_shader:
break;
case fragment_shader:
initialize_fs_variables(instructions, state);
break;
}
}
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