+ /* May return NULL if MESA_MAP_NOWAIT_BIT is set in access:
+ */
+ void * (*MapBufferRange)( GLcontext *ctx, GLenum target,
+ GLintptr offset, GLsizeiptr length, GLbitfield access,
+ struct gl_buffer_object *obj);
+
+ void (*FlushMappedBufferRange) (GLcontext *ctx, GLenum target,
+ GLintptr offset, GLsizeiptr length,
+ struct gl_buffer_object *obj);
+