+ /* In _mesa_initialize_window_framebuffer, for single-buffered
+ * visuals, the ColorReadBuffer is set to be GL_FRONT, even with
+ * GLES contexts. When calling read_buffer, we verify we are reading
+ * from GL_BACK in is_legal_es3_readbuffer_enum. But the default is
+ * incorrect, and certain dEQP tests check this. So fix it here.
+ */
+ if (_mesa_is_gles(newCtx) &&
+ !newCtx->ReadBuffer->Visual.doubleBufferMode)
+ if (newCtx->ReadBuffer->ColorReadBuffer == GL_FRONT)
+ newCtx->ReadBuffer->ColorReadBuffer = GL_BACK;