https://bugs.freedesktop.org/show_bug.cgi?id=53884
Bug #: 53884
Summary: gl_FragCoord gets corrupted in some camera angles
Classification: Unclassified
Product: Mesa
Version: 8.0
Platform: x86-64 (AMD64)
OS/Version: Linux (All)
Status: NEW
Severity: normal
Priority: medium
Component: Drivers/Gallium/r600
AssignedTo: dri-devel@lists.freedesktop.org
ReportedBy: cur...@operamail.com
Created attachment 65891
--> https://bugs.freedesktop.org/attachment.cgi?id=65891
Screenshot of the issue, bad camera angle
In certain camera angles, gl_FragCoord.xy seem to have bogus/corrupted values.
I tried to make a simple example but couldn't, so uploading an apitrace of the
bigger app and screenshots. The apitrace is 60mb XZ-compressed, that's why the
need to use a third-party service - upload limits here.
This shader:
void main() {
gl_FragColor = vec4(gl_FragCoord.xy / vec2(640, 480), 0.0, 0.0);
}
should always create values from 0 to 1 in a window of that size. In the
apitrace the only difference is that the size is passed in an uniform.
This bug happens on both r600g and llvmpipe. I didn't have the patience to wait
for softpipe to render it. I don't have anything else on this machine to
compare to (swrast, blobs).
Mesa 8.0.3
Linux 3.2.23
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