GLSL Spec 4.20.8, 4.3 Storage Qualifiers:
"Initializers in global declarations may only be used in declarations of
global variables with no storage qualifier, with a const qualifier or
with a uniform qualifier."
We do this for input variables, but not for output variables. AMD and NVIDIA
proprietary drivers don't allow this either.
---
src/glsl/ast_to_hir.cpp | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/src/glsl/ast_to_hir.cpp b/src/glsl/ast_to_hir.cpp
index 9511440..da79597 100644
--- a/src/glsl/ast_to_hir.cpp
+++ b/src/glsl/ast_to_hir.cpp
@@ -3201,6 +3201,12 @@ process_initializer(ir_variable *var, ast_declaration
*decl,
? "attribute" : "varying");
}
+ if ((var->data.mode == ir_var_shader_out) && (state->current_function ==
NULL)) {
+ _mesa_glsl_error(&initializer_loc, state,
+ "cannot initialize %s shader output",
+ _mesa_shader_stage_to_string(state->stage));
+ }
+
/* If the initializer is an ast_aggregate_initializer, recursively store
* type information from the LHS into it, so that its hir() function can do
* type checking.
--
1.9.1
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