+ struct pipe_context *pipe = st->pipe;
+ struct pipe_resource *resource = strb->texture;
+ unsigned rtt_width = strb->Base.Width;
+ unsigned rtt_height = strb->Base.Height;
+ unsigned rtt_depth = strb->Base.Depth;
+ /*
+ * For winsys fbo, it is possible that the renderbuffer is sRGB-capable but
+ * the format of strb->texture is linear (because we have no control over
+ * the format). Check strb->Base.Format instead of strb->texture->format
+ * to determine if the rb is sRGB-capable.
+ */
+ boolean enable_srgb = (st->ctx->Color.sRGBEnabled &&
+ _mesa_get_format_color_encoding(strb->Base.Format) == GL_SRGB);
+ enum pipe_format format = (enable_srgb) ?
+ util_format_srgb(resource->format) :
+ util_format_linear(resource->format);
+ unsigned first_layer, last_layer, level;
+
+ if (resource->target == PIPE_TEXTURE_1D_ARRAY) {
+ rtt_depth = rtt_height;
+ rtt_height = 1;
+ }
+
+ /* find matching mipmap level size */
+ for (level = 0; level <= resource->last_level; level++) {
+ if (u_minify(resource->width0, level) == rtt_width &&
+ u_minify(resource->height0, level) == rtt_height &&
+ (resource->target != PIPE_TEXTURE_3D ||
+ u_minify(resource->depth0, level) == rtt_depth)) {
+ break;
+ }
+ }
+ assert(level <= resource->last_level);
+
+ /* determine the layer bounds */
+ if (strb->rtt_layered) {
+ first_layer = 0;
+ last_layer = util_max_layer(strb->texture, level);
+ }
+ else {
+ first_layer =
+ last_layer = strb->rtt_face + strb->rtt_slice;
+ }