# 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()**