void GL_SetupView_Mode_Perspective(double frustumx, double frustumy, double zNear, double zFar);
void GL_SetupView_Mode_PerspectiveInfiniteFarClip(double frustumx, double frustumy, double zNear);
void GL_SetupView_Mode_Ortho(double x1, double y1, double x2, double y2, double zNear, double zFar);
+void GL_SetupView_ApplyCustomNearClipPlane(double normalx, double normaly, double normalz, double dist);
void GL_BlendFunc(int blendfunc1, int blendfunc2);
void GL_DepthMask(int state);
void GL_DepthTest(int state);
void GL_DepthRange(float nearfrac, float farfrac);
+void GL_PolygonOffset(float planeoffset, float depthoffset);
void GL_CullFace(int state);
void GL_AlphaTest(int state);
void GL_ColorMask(int r, int g, int b, int a);
// saves a section of the rendered frame to a .tga or .jpg file
qboolean SCR_ScreenShot(char *filename, unsigned char *buffer1, unsigned char *buffer2, unsigned char *buffer3, int x, int y, int width, int height, qboolean flipx, qboolean flipy, qboolean flipdiagonal, qboolean jpeg, qboolean gammacorrect);
// used by R_Envmap_f and internally in backend, clears the frame
-void R_ClearScreen(void);
+void R_ClearScreen(qboolean fogcolor);
// invoke refresh of loading plaque (nothing else seen)
void SCR_UpdateLoadingScreen(qboolean clear);