Stereo Rendering Issues

If the application changes its modelview/projection matrices midway through the scene (i.e. to draw 2D graphics over a 3D scene), that can confuse the tilesort SPU.
glDrawBuffer(GL_BOTH) can cause trouble.
As with non-planar tilesort, one often needs some knowledge of the app's coordinate space and projection parameters.
But lots of examples are included in the Chromium distribution.

If the application changes its modelview/projection matrices midway through the scene (i.e. to draw 2D graphics over a 3D scene), that can confuse the tilesort SPU.