Created at=
tachment 135998 [details]
piglit drawing output with sb enabled
With a variation of the piglit=20
spec/glsl-1.10/execution/variable-indexing/vs-output-array-vec2-index-wr
r600/sb clobbers the gl_Position/gl_FragCoord.
The variation consists in replacing two arrays of vec2 by one array of vec4=
and
swizzling the elements to achieve the same result (by effectively interleav=
ing
the two arrays).=20
A few observations:=20
* As can be seen from the colour coding screen shots, the array content is=
=20=20
correctly passed from the vertex shader to the fragment shader.=20
* The error only occurs for the uniform index value 0.=20
* When passing an additional parameter that contains a copy of gl_Position,
then this parameter seems to have the correct value (i.e. the vertex shad=
er
correctly evaluates gl_Position).
* The byte code doesn't doesn't give any obvious indication why things go w=
rong
with the optimized shader.=20
My mesa is at fa8c1b92b7.=20
best,=20
Gert