void R_Init(void);
void R_UpdateVariables(void); // must call after setting up most of r_refdef, but before calling R_RenderView
void R_RenderView(void); // must set r_refdef and call R_UpdateVariables first
+void R_RenderView_UpdateViewVectors(void); // just updates r_refdef.view.{forward,left,up,origin,right,inverse_matrix}
typedef enum r_refdef_scene_type_s {
RST_CLIENT,