8702c938b3
We had various helper functions trying to come up with the internalformat/format/type/render formats for pixmaps, and it's much nicer to just detect what those should be once at startup. This gives us a chance to do the right thing for GLES. It also, notably, fixes our format/type for depth 15 and 16 setup for desktop GL, so that we actually allocate 16bpp (GL_RGB/565) on most drivers instead of 32bpp (GL_RGB/UBYTE). GLES still has regressions over desktop (2 regressions in llvmpipe XTS, many in rendercheck), but I think this is a good baseline. Signed-off-by: Eric Anholt <eric@anholt.net>
X Server
The X server accepts requests from client applications to create windows, which are (normally rectangular) "virtual screens" that the client program can draw into.
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