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fix issues with transparent configs on es2gears

Erik Faye-Lund requested to merge kusma/mesa-demos:es2gears-transparent-fixes into main

If es2gears gets a framebuffer config with an alpha channel, two things go wrong:

  • We mark the region as opaque, even though we clear to tranparent black instead of opaque black
  • We modulate the entire color with the light-factor, instead of just the RGB components.

While it could also be argued that the gears maybe should clear with an opaque black instead of a transparent black, it kinda looks cool when rendered correct to me, so I would love it if this would work anyway 😄

An alternative could be to clear to 50% black instead, which maybe gets us the best of both worlds, and also matches what weston's "simple-egl" demo does. In either case, that can be fixed separately if anyone cares enough.

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