+ if (!(surface->texture->tex_usage & NOUVEAU_TEXTURE_USAGE_LINEAR)) {
+ struct nv40_miptree *mt = (struct nv40_miptree *)surface->texture;
+
+ if (!mt->shadow_tex) {
+ unsigned old_tex_usage = surface->texture->tex_usage;
+ surface->texture->tex_usage = NOUVEAU_TEXTURE_USAGE_LINEAR |
+ PIPE_TEXTURE_USAGE_DYNAMIC;
+ mt->shadow_tex = screen->texture_create(screen, surface->texture);
+ surface->texture->tex_usage = old_tex_usage;
+
+ assert(mt->shadow_tex->tex_usage & NOUVEAU_TEXTURE_USAGE_LINEAR);
+ }
+
+ mt->shadow_surface = screen->get_tex_surface
+ (
+ screen, mt->shadow_tex,
+ surface->face, surface->level, surface->zslice,
+ surface->usage
+ );
+
+ surface_to_map = mt->shadow_surface;
+ }
+ else
+ surface_to_map = surface;
+
+ assert(surface_to_map);
+
+ map = ws->buffer_map(ws, surface_to_map->buffer, flags);