So I was debugging texelFetch today with multisample inside softpipe,
when I found in non-fbo mode it was getting alpha values wrong,
becuase
PIGLIT_GL_VISUAL_RGB = 0,
PIGLIT_GL_VISUAL_RGBA = 0,
I expect someone thought that would get them an alpha visual, whereas
you need to add PIGLIT_GL_VISUAL_ALPHA to get that.
I expect a few other people have fallen into this hole.
Dave.
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