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-rw-r--r--src/gallium/winsys/xlib/xm_api.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/src/gallium/winsys/xlib/xm_api.c b/src/gallium/winsys/xlib/xm_api.c
index 6b46327e21f..a82d3c990e7 100644
--- a/src/gallium/winsys/xlib/xm_api.c
+++ b/src/gallium/winsys/xlib/xm_api.c
@@ -511,6 +511,14 @@ initialize_visual_and_buffer(XMesaVisual v, XMesaBuffer b,
return GL_FALSE;
}
v->mesa_visual.indexBits = 0;
+
+ if (v->BitsPerPixel == 32) {
+ /* We use XImages for all front/back buffers. If an X Window or
+ * X Pixmap is 32bpp, there's no guarantee that the alpha channel
+ * will be preserved. For XImages we're in luck.
+ */
+ v->mesa_visual.alphaBits = 8;
+ }
}
/*