Implement glAccum() #73
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We don't really know if double buffering is used, since it's a decision that the integration library takes. We limit the implementation to a check whether the correct value is being set; we don't really allow changing the read or the write buffer, since reading or writing from the XFB would be troublesome (it's in YUV format).
This can help avoid unnecessary switches (which are quite expensive). Do not assume that after drawing to the stencil we what to draw to the scene again, let's wait until a drawing command is effectively issued.
Generate the accumulation buffer by capturing the EFB contents, then use the appropriate blending modes to render the accumulation buffer on the scene. Tested with the accanti.c and accum.c sample programs found online: - https://openglut.sourceforge.net/accanti_8c.html - https://fossies.org/linux/mesa-demos/src/samples/accum.c
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Generate the accumulation buffer by capturing the EFB contents, then use the appropriate blending modes to render the accumulation buffer on the scene.
Tested with the accanti.c and accum.c sample programs found online: