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-rw-r--r--src/gallium/state_trackers/glx/xlib/xm_api.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/src/gallium/state_trackers/glx/xlib/xm_api.c b/src/gallium/state_trackers/glx/xlib/xm_api.c
index 82384a4d284..94c0ad496d4 100644
--- a/src/gallium/state_trackers/glx/xlib/xm_api.c
+++ b/src/gallium/state_trackers/glx/xlib/xm_api.c
@@ -666,11 +666,11 @@ XMesaVisual XMesaCreateVisual( Display *display,
v->stvis.buffer_mask = ST_ATTACHMENT_FRONT_LEFT_MASK;
if (db_flag)
- v->stvis.buffer_mask = ST_ATTACHMENT_BACK_LEFT_MASK;
+ v->stvis.buffer_mask |= ST_ATTACHMENT_BACK_LEFT_MASK;
if (stereo_flag) {
- v->stvis.buffer_mask = ST_ATTACHMENT_FRONT_RIGHT_MASK;
+ v->stvis.buffer_mask |= ST_ATTACHMENT_FRONT_RIGHT_MASK;
if (db_flag)
- v->stvis.buffer_mask = ST_ATTACHMENT_BACK_RIGHT_MASK;
+ v->stvis.buffer_mask |= ST_ATTACHMENT_BACK_RIGHT_MASK;
}
v->stvis.color_format = choose_pixel_format(v);