https://bugs.freedesktop.org/show_bug.cgi?id=55256
Priority: medium
Bug ID: 55256
Assignee: dri-devel at lists.freedesktop.org
Summary: r600g R600_LLVM=1 bad rendering (light blue instead of
grey)
Severity: normal
Classification: Unclassified
OS: Linux (All)
Reporter: edwin+mesa at etorok.net
Hardware: Other
Status: NEW
Version: git
Component: Drivers/DRI/R600
Product: Mesa
Created attachment 67592
--> https://bugs.freedesktop.org/attachment.cgi?id=67592&action=edit
apitrace
Attached is an apitrace, and screenshots.
Bad behaviour with --enable-r600-llvm-compiler:
OpenGL vendor string: X.Org
OpenGL renderer string: Gallium 0.4 on AMD RV730
OpenGL version string: 3.0 Mesa 9.1-devel (git-fb40f88)
OpenGL shading language version string: 1.30
If you look at the 'bad.png' screenshot you'll see that the 4th column is light
blue. It should be grey.
With R600_LLVM=0 the good behaviour is seen: good.png.
See the apitrace for the full shader, here is the relevant bit:
else if (gl_FragCoord.x < 640)
color = vec4(1.0f, 1.0f, 1.0f, 1.0f);//white
[...]
vec4 color0, color1, color2, color3;
if (gl_FragCoord.y < 200) {
color0 = color1 = color2 = color;//75%
[...]
} else if (xmod < 55 || xmod >= 105 ||
ymod < 75 || ymod >= 125) {
// real color
// TODO: buggy on r600g with LLVM?
gl_FragColor = (color0 + color1 + color2 + color3) / 4.0f;
P.S.: the shader is not optimal, most of the branches could be moved out of it,
I haven't tried to minimize the testcase though.
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