Region tile object list pointers can be identical for op and tr modvols,
in which case tr modvols should be drawn using op modvols geometry.
Used by crazy taxi 1/2, alien front online, daytona usa and probably
many others.
Issue #717
shared libraries containing gnuc unique symbols are never unloaded on
linux, and possibly other platforms. So don't terminate the emulator on
deinit and init it only once.
Issue #566
gl4: buffer not released on term() was causing crashes or black screen when restarted.
elan: Get rid of geometry shader and do geometry clipping manually.
pvr: Aggressively merge transparent polys in per-triangl and OIT mode, duplicating the last vertex to merge opposite cull mode strips.
gl4: reset OIT pointers in final shader. No need for clear pass.
gl4: alternate between 2 buffers for verts.index/tr poly params.
gl4: use gl_VertexID + poly number for poly index.
gl: new GlBuffer class.
Use w=1 to avoid multiply/divide of xy as in dx9
Disable rendering when video output disabled
Use original w value in pixel struct to avoid precision loss (samsptk)
vk oit: missing memory barrier was producing Tr modvol glitches (JSR)
gl oit: Tr modvol needs full vertex shader
Support VO_STARTX and VO_STARTY for shifting displayed frame
Add glm to deps
Calculate NDC, scissoring and viewport matrices once
Reduce code duplication
Depth testing is done in the fragment shader so it shouldn't be done
in the a-buffer shader for the first pixel, or until the depth is updated.
Fixes flashlight and lightstorm effects in Alone in the Dark
90deg CC screen rotation option for some arcade games
Fix scissoring and clipping when screen scaling/stretching/rotating
Clear shader cache when screen rotation changes
Properly delete all gl programs and shaders when needed
implement screen scaling for per-pixel renderer
fix output FBO not being freed/recreated when GL context is reset
refactor DrawQuad on per-pixel renderer
Flyinghead