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Frame structure wrt calls from the engine

(eng) SCR_UpdateScreen()
- (eng) V_PreRender()
  - (ref) R_BeginFrame()
- (eng) V_RenderView()
  - (ref) GL_BackendStartFrame() -- ref_gl only sets speeds string to empty here
    - (eng) loop over ref_params_t views
      - (ref) GL_RenderFrame()
    - (eng) ??? SV_DrawDebugTriangles()
  - (ref) GL_BackendEndFrame() -- ref_gl only produces speeds string here
- (eng) V_PostRender()
  - (ref) R_AllowFog(), R_Set2DMode(true)
  - (ref) R_DrawTileClear() x N
  - (vgui) Paint() -> ???
  - (eng) SCR_RSpeeds()
    - (ref) R_SpeedsMessage()
    - (eng) CL_DrawString() ...
      - (ref) GL_SetRenderMode()
        
        (ref) RefGetParm() for texture resolution
        
        (ref) Color4ub()
        
        (ref) R_DrawStretchPic()
  - (eng) SRC_DrawNetGraph()
    - (ref) many TriApi calls -- 2D usage of triapi. we were not ready for this (maybe track R_Set2DMode()?)
  - (ref) R_ShowTextures() kekw
  - (ref) VID_ScreenShot()
  - (ref) R_AllowFog(true)
  - (ref) R_EndFrame()