- int rtt_width = strb->Base.Width;
- int rtt_height = strb->Base.Height;
- int rtt_depth = strb->Base.Depth;
- enum pipe_format format = st->ctx->Color.sRGBEnabled ? resource->format :
- util_format_linear(resource->format);
+ 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);