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When a layout contains a duplicated layout-qualifier-name in a single
declaration, only the last occurrence should be taken into account.
From page 59 (page 65 of the PDF) of the GLSL 4.40 spec:
" More than one layout qualifier may appear in a single
declaration. Additionally, the same layout-qualifier-name can
occur multiple times within a layout qualifier or across multiple
layout qualifiers in the same declaration. When the same
layout-qualifier-name occurs multiple times, in a single
declaration, the last occurrence overrides the former
occurrence(s)."
Consider this example:
" #version 150
#extension GL_ARB_enhanced_layouts: enable
layout(max_vertices=2, max_vertices=3) out;
layout(max_vertices=3) out;"
Although different values for "max_vertices" results in a compilation
error. The above code is valid because max_vertices=2 is ignored.
When merging qualifiers in an ast_type_qualifier, we now simply ignore
new appearances of a same layout-qualifier-name if the
"is_single_layout_merge" parameter is true, this works because the GLSL
parser processes qualifiers from right to left.
Reviewed-by: Timothy Arceri <timothy.arceri@collabora.com>
Signed-off-by: Andres Gomez <agomez@igalia.com>
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