From 5935b16ff5d8cbe07c97f2990e281a9c5986d0a1 Mon Sep 17 00:00:00 2001 From: Brian Date: Thu, 27 Mar 2008 21:11:45 -0600 Subject: 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. --- src/gallium/winsys/xlib/xm_api.c | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'src') diff --git a/src/gallium/winsys/xlib/xm_api.c b/src/gallium/winsys/xlib/xm_api.c index 6b46327e21..a82d3c990e 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; + } } /* -- cgit v1.2.3