change default fog settings, put sprite billboarding in menus and attempt to make colormaps look nicer still

Open Graphics Library (OpenGL) is a cross-language, cross-platform application programming interface (API) for rendering 2D and 3D vector graphics. The API is
typically used to interact with a graphics processing unit (GPU), to achieve hardware-accelerated rendering.

This reverts commit 995edfb1.

This reverts commit a2a63c5e.

Vid_BlitLinearScreen didn't make sure that it was actually meant to be copying the entire screen rows before doing it properly.

Pros: fuckin SMOOTH effect especially for 256-color sw
Cons: might lose the intended color distortion, maybe
not a great idea for FPS
Conclusion: put it behind an ifdef for now

Preview is fairly basic, and only shows players
rewinding. Full state is restored via reloading
the replay and jumping to the timestamp once
the rewind is done.

SSNTails authored 6 years ago and Marco Z committed 6 years ago

No longer using byte2float in DrawPolygon -- use the surface color data directly
Vertex Buffer Objects for non-interpolated model frames
Removed some old unused paletted texture stuff