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RENDER requires that sampling outside of any source/mask picture results
in alpha == 0.0.

The OpenGL border colour cannot set alpha = 0.0 if the texture format
doesn't have an alpha channel, so we have to use the RepeatFix handling
in that case.

Also, only force alpha = 1.0 when sampling inside of RGBx source/mask
pictures.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=94514Signed-off-by: Michel Dänzer <michel.daenzer@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>