glsl2: Make gl_MaxDrawBuffers available in the fragment shader
diff --git a/src/glsl/ir_variable.cpp b/src/glsl/ir_variable.cpp
index 6e466fa..e298a0e 100644
--- a/src/glsl/ir_variable.cpp
+++ b/src/glsl/ir_variable.cpp
@@ -42,6 +42,9 @@
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 @@
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);