https://bugs.freedesktop.org/show_bug.cgi?id=104143
Bug ID: 104143
Summary: r600/sb: clobbers gl_Position -> gl_FragCoord
Product: Mesa
Version: git
Hardware: x86-64 (AMD64)
OS: Linux (All)
Status: NEW
Severity: normal
Priority: medium
Component: Drivers/Gallium/r600
Assignee: dri-devel@lists.freedesktop.org
Reporter: gw.foss...@gmail.com
QA Contact: dri-devel@lists.freedesktop.org
Created attachment 135998
--> https://bugs.freedesktop.org/attachment.cgi?id=135998&action=edit
piglit drawing output with sb enabled
With a variation of the piglit
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 interleaving
the two arrays).
A few observations:
* As can be seen from the colour coding screen shots, the array content is
correctly passed from the vertex shader to the fragment shader.
* The error only occurs for the uniform index value 0.
* 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 shader
correctly evaluates gl_Position).
* The byte code doesn't doesn't give any obvious indication why things go wrong
with the optimized shader.
My mesa is at fa8c1b92b7.
best,
Gert
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