[Mesa-dev] [PATCH 00/12] ARB_fragment_layer_viewport for i965

[Ian Romanick]

On 01/24/2014 11:51 PM, Chris Forbes wrote:
> This series adds support for ARB_fragment_layer_viewport on i965 Gen7, in
> core contexts [the same conditions as for ARB_viewport_array being exposed].
> 
> This is another tiny piece of GL4.3, allowing the GS- [or with
> AMD_vertex_shader_*, VS- ] written values of gl_Layer and gl_ViewportIndex
> to be read by the fragment shader.
> 
> Note that there are a few oddities in the spec, which I've assumed hopefully
> reasonable corrections for:
> 
> - Dependencies section specifies that ARB_geometry_shader4 is required, but
>   should probably be 'geometry shaders are required', or perhaps 'GL 3.2 or
>   ARB_geometry_shader4 is required'.
> - In the description of gl_Layer's behavior, there is a stray reference to
>   `gl_Value` which should be `gl_Layer`.
> - The extension doesn't list a new define for shaders to test for presence.
>   I've assumed the usual pattern in 6/12.

Thanks for reporting these.  I've submitted a spec bug and a patch.

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