https://bugs.freedesktop.org/show_bug.cgi?id=42435
Bug #: 42435 Summary: Suspected loss of varyings between shaders Classification: Unclassified Product: Mesa Version: git Platform: x86-64 (AMD64) OS/Version: Linux (All) Status: NEW Severity: major Priority: medium Component: Drivers/Gallium/r600 AssignedTo: dri-devel@lists.freedesktop.org ReportedBy: screwdriver@lxnt.info
Longer description, the test case, screenshots, and core from i965 crash are in attached archive.
In short:
I try to draw a 2D screenful of point sprites, emulating an ansi-colored terminal. Fragment shader receives texture coordinates for the character, its color and size of graphic in the texture via varyings.
R600g draws a black screen, while llvmpipe and fglrx draw what is supposed to be drawn. i965 crashes. non-llvm swrast fails to set gl_PointSize. R600c also draws a black screen.
Drawing varying values themselves I get bogus values for some of them.
Mesa version: 7.12.0~git20111027.0fbc8d30-0ubuntu0sarvatt~natty