If visual is 32bpp, set visual->alphaBits = 8.

This works since we always use XImages for color buffers.  It wouldn't always
work for Windows/Pixmaps.

diff --git a/src/gallium/winsys/xlib/xm_api.c b/src/gallium/winsys/xlib/xm_api.c
index 6b46327e21f07e35617ca4ebdaf118e4be55232c..a82d3c990e7f98b40a37d0e4deb36c9f8969ce9b 100644 (file)
--- 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;
+      }
    }
 
    /*