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The Intel drivers in Mesa 7.6 (and possibly earlier versions) don't support creating FBOs with a stencil buffer but without a depth buffer. This reworks framebuffer allocation so that we try a number of fallback options before failing. The options we try in order are: - the same options that were sucessful last time if available - combined depth and stencil - separate depth and stencil - just stencil, no depth - just depth, no stencil - neither depth or stencil