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Set up fragment shader builtin variables.

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This commit is contained in:
Eric Anholt
2010-03-25 14:48:25 -07:00
parent 7c15bb2465
commit b3f743ab0b
2 changed files with 60 additions and 0 deletions
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7
builtin_variables.h
View File

@@ -32,6 +32,13 @@ static const builtin_variable builtin_core_vs_variables[] = {
{ ir_var_out, "float", "gl_PointSize" },
};
static const builtin_variable builtin_core_fs_variables[] = {
{ ir_var_out, "vec4", "gl_FragCoord" },
{ ir_var_out, "bool", "gl_FrontFacing" },
{ ir_var_out, "vec4", "gl_FragColor" },
{ ir_var_out, "float", "gl_FragDepth" },
};
static const builtin_variable builtin_110_deprecated_vs_variables[] = {
{ ir_var_in, "vec4", "gl_Vertex" },
{ ir_var_in, "vec4", "gl_Normal" },

53
ir_variable.cpp
View File

@@ -127,6 +127,57 @@ initialize_vs_variables(exec_list *instructions,
}
}
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_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,
@@ -137,7 +188,9 @@ _mesa_glsl_initialize_variables(exec_list *instructions,
initialize_vs_variables(instructions, state);
break;
case geometry_shader:
break;
case fragment_shader:
initialize_fs_variables(instructions, state);
break;
}
}