Andres Gomez
c81fbb42d9
From page 76 (page 80 of the PDF) of the GLSL 4.60 v.5 spec:
" No aliasing in output buffers is allowed: It is a compile-time or
link-time error to specify variables with overlapping transform
feedback offsets."
Currently, this is expected to fail, but it succeeds:
"
...
layout (xfb_offset = 0) out vec2 a;
layout (xfb_offset = 0) out vec4 b;
...
"
Fixes the following piglit test:
tests/spec/arb_enhanced_layouts/compiler/transform-feedback-layout-qualifiers/xfb_offset/invalid-overlap.vert
Fixes the following test:
KHR-GL44.enhanced_layouts.xfb_output_overlapping
v2:
- Use a data structure to track the used components instead of a
nested loop (Ilia).
v3:
- Take the BITSET_WORD array out from the
gl_transform_feedback_buffer struct and make it local to the
validation process (Timothy).
- Do not use a nested scope for the validation (Timothy).
v4:
- Add reference to the fixed piglit test in the commit log.
- Add reference to the fixed VK-GL-CTS test in the commit
log (Tapani).
- Empty initialize the BITSET_WORD pointers array (Tapani).
Cc: Timothy Arceri <tarceri@itsqueeze.com>
Cc: Ilia Mirkin <imirkin@alum.mit.edu>
Signed-off-by: Andres Gomez <agomez@igalia.com>
Reviewed-by: Tapani Pälli <tapani.palli@intel.com>
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