Done for all platforms, CMakeLists included. Unneeded with glad.
Renderer fallback logic now includes gles1, just before soft:
custom -> gl3 -> gles3 -> gl1 -> gles1 -> soft.
- Fix platforms in q64/outpost,
- Add MDR model format support,
- Sync with classic yquake 2 repository,
- Full support pcx version 5 format,
- Rework image load code.
Static arrays there have their dimensions swapped, they make more sense now.
Added important detail in gl1_lightmapcopies doc.
Also added doc for gl_polyblend, just because of its "popularity".
Available in both GL1 and GLES1. Keep multiple copies of "the same"
lightmap on video memory; they are actually different, because they're
used in different frames. This is a workaround for the usage of
glTexSubImage2D() for dynamic lighting, since modifying textures used
recently causes slowdown in embedded/mobile devices.
Controlled by gl1_lightmapcopies cvar; default in GL1 is `0`, while
in GLES1 is `1`.
Available only on GLES1, allows to use a "performance hint" to the
GPU to discard the contents of depth and stencil buffers after each
frame. Some hardware might want to reuse them, but Quake 2 doesn't
work that way.
Controlled by gl1_discardfb cvar, default `1`.
Variant of GL1, meant for embedded/mobile devices only.
Build it with "make with_gles1".
For Windows, you'll need MSYS2 and a decent ANGLE implementation
(probably not worth the trouble).
Building with CMake only works in Linux, so it has been commented out.
Changed "buffer" functions (vertex, single/mtex, color) to macros.
Macros eliminate the function call overhead, resulting in faster
execution times. Depending of the hardware, there might be a
performance increase of almost 10%.
This forced the buffer to be exposed as global.
Not worth doing this for 2D elements though.
glTexSubImage2D() calls are very slow, and are even slower when
the texture is big. Dynamic lighting changes are small compared
to the huge 512x512 size of the lightmap this option provided,
so it was detrimental to performance.
Original logic remains underneath if there's a need of a comeback.
