From: Brian <brian.paul@tungstengraphics.com>
Date: Fri, 28 Mar 2008 03:11:45 +0000 (-0600)
Subject: If visual is 32bpp, set visual->alphaBits = 8.
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=5935b16ff5d8cbe07c97f2990e281a9c5986d0a1;p=mesa.git

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 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;
+      }
    }
 
    /*