gitignore build_cmake directory
Merge branch 'master' of https://github.com/cmbruns/gzdoom into cmb_stereo3d
Create basic green/magenta stereo 3D mode.
Refactor uses of glColorMask() to not interfere with use of glColorMask() in 3D mode.
Create RAII LocalScopeGLColorMask class to help anaglyph 3D.
Refactor gl_scene.cpp to be more accessible to stereo 3D.
Refactor stereo rendering into Stereo3D class.
Add several stereo 3D modes: side-by-side, left, right, red-cyan
Add cvars st3d_mode, st3d_iod, and st3d_screendist, for runtime control of 3D.
Create gl_stereo3d.cpp, instead of header only.
Add viewport_scalex,viewport_offsetx members to FLGRenderer, in a failed attempt get side-by-side stereo just so.
Move st3d_<> cvars to gl_stereo3d.cpp, and add CVAR st3d_swap, to swap eyes.