On Thu, Sep 22, 2011 at 01:05:18 +0200, Sylvain Beucler wrote: > Package: libgl1-mesa-dri > Version: 7.11-5 > Severity: important > > Hi, > > When testing Guus' excellent tutorial: > http://en.wikibooks.org/wiki/OpenGL_Programming/Scientific_OpenGL_Tutorial_01 > we spotted a few issues in the software and radeon renderers linked to > the point size feature in OpenGL. > > Attached is a sample program. You can press F1/F2/F3 to switch > between lines/dots/point-sprites rendering, what interests us here are > dots and point-sprites. > > - Under Radeon, all modes get color artifacts (memory-corruption-like > colors are displayed instead of a shade of blue). > > - Dots are not working with LIBGL_ALWAYS_SOFTWARE=1: variable dots > size instead of fixed size (it seems to use gl_Position.x as point > size). Point sprites seem to have a similar issue. > > - Dots are showned properly on an IntelGPU+Ubuntu environment, and > under windows with radeon 9600, making me suggest the problem lies > in the OpenGL implementation rather than in the code. > > Dots and point-sprites are not common in games, but more in scientific > applications. > You should probably take this up on the mesa-...@lists.freedesktop.org list, where the radeon developers will have a better chance of figuring this out.
Cheers, Julien -- To UNSUBSCRIBE, email to debian-x-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/20111204153235.ga7...@radis.cristau.org
