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authorJuan A. Suarez Romero <[email protected]>2017-07-07 09:35:52 +0000
committerJuan A. Suarez Romero <[email protected]>2017-08-01 15:58:24 +0000
commit54826331b31d4cdcb3a7e444caf97b75c3364b54 (patch)
tree3cc429f9842b46918427493c0212584ab8f473ad /bin
parentd4b44783906d3dd37903525dd187c53f4bd26918 (diff)
glsl: xfb_stride applies to buffers, not block members
When we have an interface block like: layout (xfb_buffer = 0, xfb_offset = 0) out Block { vec4 var1; layout (xfb_stride = 48) vec4 var2; vec4 var3; }; According to ARB_enhanced_layouts spec: "The *xfb_stride* qualifier specifies how many bytes are consumed by each captured vertex. It applies to the transform feedback buffer for that declaration, whether it is inherited or explicitly declared. It can be applied to variables, blocks, block members, or just the qualifier out. [ ...] While *xfb_stride* can be declared multiple times for the same buffer, it is a compile-time or link-time error to have different values specified for the stride for the same buffer." This means xfb_stride actually applies to the buffer, and not to the individual components. In the above example, it means that var2 consumes 16 bytes, and var3 is at offset 32. This has been confirmed also by John Kessenich, the main contact for the ARB_enhanced_layouts specs, and also because this commit fixes: GL45.enhanced_layouts.xfb_block_member_stride This commit is in practice a revert of 598790e8564 (glsl: apply xfb_stride to implicit offsets for ifc block members). Reviewed-by: Timothy Arceri <[email protected]> Reviewed-by: Nicolai Hähnle <[email protected]>
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