dx11: naomi2 support
n2: ambient color was swapping red and blue
gl, dx11: don't write depth in per-strip to avoid missing geometry,
prefer wrong depth order/blending for now
optimize naomi2 per-triangle sorting
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.
Writes current TA_OL_BASE to all tiles OPB block. Read from region array
at render time to identify context.
Fixes vf4 water reflections RTT
get rid of dump_frame/read_frame
flyinghead