Miscellaneous OpenGL Fixes (Fixes #493, #1074)

chromaticpipe ‎requested to merge
chromaticpipe2/SRB2:miscglfixes into next

A compilation of fixes from SRB2Classic and a few that I made for here.

  • Fixes sloperollangle in reverse gravity
  • Fixes models acting weird with sloped lights
  • Adds RF_NOCOLORMAP and RF_FLIPOFFSETS support to 3d models
  • Fix text prompt backgrounds ignoring color cube
Edited by chromaticpipe ‎

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