[Mesa-dev] [PATCH v2 2/5] meta: fix meta clear of layered framebuffers
eric at anholt.net
Thu Nov 21 11:56:16 PST 2013
Eric Anholt <eric at anholt.net> writes:
> Paul Berry <stereotype441 at gmail.com> writes:
>> From section 4.4.7 (Layered Framebuffers) of the GLSL 3.2 spec:
>> When the Clear or ClearBuffer* commands are used to clear a
>> layered framebuffer attachment, all layers of the attachment are
>> This patch fixes meta clears to properly clear all layers of a layered
>> framebuffer attachment. We accomplish this by adding a geometry
>> shader to the meta clear program which sets gl_Layer to a uniform
>> value. When clearing a layered framebuffer, we execute in a loop,
>> setting the uniform to point to each layer in turn.
> I don't think we should be running a gs in the !NumLayers case. The
> other patches are:
> Reviewed-by: Eric Anholt <eric at anholt.net>
Paul reminded that thanks to the simd16 repdata clear, we're basically
never calling glsl clear on gen6+, and we only enable GS on gen7+.
As such, I'm not really concerned about the performance any more, and by
the time anyone else can care about it we should have ARB_sso, at which
point optionally slotting in a GS to do this work on a layered FB is
easy. I think.
Reviewed-by: Eric Anholt <eric at anholt.net>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Size: 835 bytes
Desc: not available
More information about the mesa-dev