Source graphics

Contains both high-level and low-level routines for handling 3d graphics primitives. To allow for rendering with either DirectX or OpenGL, the graphics engine uses a structure (gr_screen) with function pointers to all the standard 3d operations (such as initializing the screen, page flipping, displaying primitives etc.). There are basically two sets of source files: grd3d* (DirectX) and gropengl* (OpenGL).

Major Classes/Functions/Structs

Class/Group/Struct	Method/Function/Element	Notes
gr_screen/screen global struct	res, mode, aspect etc.	Contains all info about screen setup (bits, resolution, etc)
	gf_* functions	Wraps standard 3d functions such as page flip, render buffer etc. allowing the engine to abstract DirectX and OpenGL functions.
	gf_render_buffer()	Main rendering call for models (ships etc.). Wraps buffer rendering modes in DirectX/OpenGL.
gr_* functions	gr_init()	Initialises graphics engine (either DirectX or OpenGL)