According to the GLSL 4.30 specification, this is a compile time error.
Earlier specifications don't specify a behavior, but since 0 and 1 are
the only valid indices for dual source blending, it makes sense to
generate the error.
Fixes (the fixed version of) piglit's layout-12.frag.
NOTE: This is a candidate for the 9.0 branch.
Signed-off-by: Kenneth Graunke <kenn...@whitecape.org>
---
src/glsl/ast_to_hir.cpp | 17 +++++++++++++++--
1 file changed, 15 insertions(+), 2 deletions(-)
diff --git a/src/glsl/ast_to_hir.cpp b/src/glsl/ast_to_hir.cpp
index 02fe66b..becf6f9 100644
--- a/src/glsl/ast_to_hir.cpp
+++ b/src/glsl/ast_to_hir.cpp
@@ -2086,9 +2086,22 @@ apply_type_qualifier_to_variable(const struct
ast_type_qualifier *qual,
} else {
var->location = qual->location;
}
+
if (qual->flags.q.explicit_index) {
- var->explicit_index = true;
- var->index = qual->index;
+ /* From the GLSL 4.30 specification: "It is also a compile-time
+ * error if a fragment shader sets a layout index to less than 0
+ * or greater than 1."
+ *
+ * Older specifications don't mandate a behavior; we take this
+ * as a clarification and always generate the error.
+ */
+ if (qual->index < 0 || qual->index > 1) {
+ _mesa_glsl_error(loc, state,
+ "explicit index may only be 0 or 1\n");
+ } else {
+ var->explicit_index = true;
+ var->index = qual->index;
+ }
}
}
} else if (qual->flags.q.explicit_index) {
--
1.7.11.4
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