+static void
+nouveau_renderbuffer_map(struct gl_context *ctx,
+ struct gl_renderbuffer *rb,
+ GLuint x, GLuint y, GLuint w, GLuint h,
+ GLbitfield mode,
+ GLubyte **out_map,
+ GLint *out_stride)
+{
+ struct nouveau_surface *s = &to_nouveau_renderbuffer(rb)->surface;
+ GLubyte *map;
+ int stride;
+ int flags = 0;
+
+ if (mode & GL_MAP_READ_BIT)
+ flags |= NOUVEAU_BO_RD;
+ if (mode & GL_MAP_WRITE_BIT)
+ flags |= NOUVEAU_BO_WR;
+
+ nouveau_bo_map(s->bo, flags, context_client(ctx));
+
+ map = s->bo->map;
+ stride = s->pitch;
+
+ if (rb->Name == 0) {
+ map += stride * (rb->Height - 1);
+ stride = -stride;
+ }
+
+ map += x * s->cpp;
+ map += (int)y * stride;
+
+ *out_map = map;
+ *out_stride = stride;
+}
+
+static void
+nouveau_renderbuffer_unmap(struct gl_context *ctx,
+ struct gl_renderbuffer *rb)
+{
+}
+