Ian Romanick wrote:Nathan Gray wrote:
This is an example from an opengl tutorial that I'm trying out. If I run it with LIBGL_ALWAYS_INDIRECT it works fine, but with direct rendering I just get a blank window. I'm using the radeon driver from recent CVS (checked out yesterday anonymously) on a Dell Inspiron 4150 w/Radeon Mobility M7.
So, the example is drawing a wire-frame cube and clearing the screen as fast as it can on a single-buffered display? What do you think the odds are on a fast video card that the video refresh logic will just happen to be displaying something when it's not cleared? Pretty close to 0 I'd say. The driver isn't broken. You only see it with indirect rendering because the drawing / clearing is slower, so the cube is on the screen for a larger amount of time.
In that case shouldn't LIBGL_SYNC_REFRESH fix the problem? It doesn't.
LIBGL_SYNC_REFRESH causes the GL to wait until the vertical retrace to perform a glXSwapBuffers. That code segment has no glXSwapBuffers (because it's single buffered). Put a 'glFinish(); sleep(1);' at the end of the rendering function.
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