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glsl: Generate compile errors for explicit blend indices < 0 or > 1.

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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 <kenneth@whitecape.org>
Reviewed-by: Paul Berry <stereotype441@gmail.com>
This commit is contained in:
Kenneth Graunke 2012-08-31 16:04:19 -07:00
parent 87389d4e5c
commit 354f2cb5c7
1 changed files with 17 additions and 2 deletions
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19
src/glsl/ast_to_hir.cpp
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@ -2086,9 +2086,24 @@ 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, section 4.4.2 (Output
* Layout Qualifiers):
*
* "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) {