GLES3.2 spec, page 126:
> The variable gl_PointSize is intended for a shader to write
> the size of the point to be rasterized. It is measured in pixels.
> If gl_PointSize is not written to, its value
> is undefined in subsequent pipe stages.
If glamor shader is use points, we should define gl_PointSize for GLES.
On Desktop GL, it "just work" due to default gl_PointSize is 1.
As @anholt requested, define this only for minimal amount of shaders
(point and glyphbit ones), to make sure than performance will not
affected
Reviewed-by: Emma Anholt <emma@anholt.net>
Reviewed-by: Adam Jackson <ajax@redhat.com>
Signed-off-by: Konstantin <ria.freelander@gmail.com>
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