-extern void
-_mesa_win_fog_coords_from_z( const GLcontext *ctx,
- GLuint n,
- const GLdepth z[],
- GLfloat fogcoord[] );
-
-extern void
-_mesa_depth_fog_rgba_pixels( const GLcontext *ctx, struct sw_span *span,
- GLchan rgba[][4] );
-
-extern void
-_mesa_depth_fog_ci_pixels( const GLcontext *ctx, struct sw_span *span,
- GLuint index[] );