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glsl2: Make gl_MaxDrawBuffers available in the fragment shader

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This commit is contained in:
Ian Romanick 2010-06-29 15:19:11 -07:00
parent 9c4b1f2bad
commit e2f84f04e5
1 changed files with 15 additions and 0 deletions
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15
src/glsl/ir_variable.cpp
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@ -42,6 +42,9 @@ add_variable(const char *name, enum ir_variable_mode mode, int slot,
var->mode = mode;
switch (var->mode) {
case ir_var_auto:
var->read_only = true;
break;
case ir_var_in:
var->shader_in = true;
var->read_only = true;
@ -259,6 +262,18 @@ generate_ARB_draw_buffers_fs_variables(exec_list *instructions,
struct _mesa_glsl_parse_state *state,
bool warn)
{
assert(state->Const.MaxDrawBuffers >= 1);
ir_variable *const mdb =
add_variable("gl_MaxDrawBuffers", ir_var_auto, -1,
glsl_type::int_type, instructions, state->symbols);
if (warn)
mdb->warn_extension = "GL_ARB_draw_buffers";
mdb->constant_value = new(mdb)
ir_constant(int(state->Const.MaxDrawBuffers));
const glsl_type *const vec4_array_type =
glsl_type::get_array_instance(state->symbols, glsl_type::vec4_type,
state->Const.MaxDrawBuffers);