st/xlib: Fix upside down coordinates for CopySubBuffer

The coordinates need to be inverted between glX and gallium.

NOTE: This is a candidate for stable release branches.

Reviewed-by: Brian Paul <[email protected]>

1 files changed, 1 insertions, 1 deletions

diff --git a/src/gallium/state_trackers/glx/xlib/xm_api.c b/src/gallium/state_trackers/glx/xlib/xm_api.c
index 66d29a5e0f5..c39968dc7cf 100644
--- a/src/gallium/state_trackers/glx/xlib/xm_api.c
+++ b/src/gallium/state_trackers/glx/xlib/xm_api.c
@@ -1255,7 +1255,7 @@ void XMesaCopySubBuffer( XMesaBuffer b, int x, int y, int width, int height )
 {
    xmesa_copy_st_framebuffer(b->stfb,
          ST_ATTACHMENT_BACK_LEFT, ST_ATTACHMENT_FRONT_LEFT,
-         x, y, width, height);
+         x, b->height - y - height, width, height);
 }