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authorKenneth Graunke <[email protected]>2014-06-22 22:27:49 -0700
committerKenneth Graunke <[email protected]>2014-06-30 00:08:54 -0700
commit7577cdd8300068bdf1eda426951d7141450283aa (patch)
tree545c6133c9922612147d1e431d6daa668e6d2d65 /src/mapi/glapi
parentf3c5b2f7d08f8a2a41df0a224cd6600ce4260fa1 (diff)
meta: Use AMD_vertex_shader_layer instead of a GS for layered clears.
On i965, enabling and disabling the GS is not free: you have to do a full pipeline stall, reconfigure the URB and push constant space, and emit a bunch of state. Most clears aren't layered, so the GS isn't needed in the common case. But we turned it on universally. Using AMD_vertex_shader_layer allows us to skip setting up the GS altogether, while achieving the same effect. According to Ilia, current nVidia GPUs can't do AMD_vertex_shader_layer. However, since nouveau is Gallium-based, they're unlikely to ever care about this path. Intel and AMD GPUs both support the extension. Since i965 is the only driver using this path which does layered rendering, we may as well target it at that. v2: Improve commit message. No code changes. Signed-off-by: Kenneth Graunke <[email protected]> Reviewed-by: Chris Forbes <[email protected]> Reviewed-by: Jordan Justen <[email protected]>
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