Mesa (master): Enable is_front_buffer_rendering variable in case of GL_FRONT_AND_BACK

[Anuj Phogat]

Module: Mesa
Branch: master
Commit: c979fe3e200f42ff1fad75ebdbebe69da27e1aaa
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=c979fe3e200f42ff1fad75ebdbebe69da27e1aaa

Author: Anuj Phogat <anuj.phogat at gmail.com>
Date:   Fri Jan  6 12:48:45 2012 -0800

Enable is_front_buffer_rendering variable in case of GL_FRONT_AND_BACK

glDrawBuffer(GL_FRONT_AND_BACK) results in to segmentation fault if
intel->is_front_buffer_rendering is not enabled with GL_FRONT_AND_BACK.
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=44153

Reported-by: Yi Sun <yi.sun at intel.com>
Signed-off-by: Anuj Phogat <anuj.phogat at gmail.com>
Reviewed-by: Eric Anholt <eric at anholt.net>

---

 src/mesa/drivers/dri/intel/intel_buffers.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/src/mesa/drivers/dri/intel/intel_buffers.c b/src/mesa/drivers/dri/intel/intel_buffers.c
index 4632751..9809f79 100644
--- a/src/mesa/drivers/dri/intel/intel_buffers.c
+++ b/src/mesa/drivers/dri/intel/intel_buffers.c
@@ -88,7 +88,7 @@ intelDrawBuffer(struct gl_context * ctx, GLenum mode)
 	intel->is_front_buffer_rendering;
 
       intel->is_front_buffer_rendering = (mode == GL_FRONT_LEFT)
-	|| (mode == GL_FRONT);
+	|| (mode == GL_FRONT) || (mode == GL_FRONT_AND_BACK);
 
       /* If we weren't front-buffer rendering before but we are now,
        * invalidate our DRI drawable so we'll ask for new buffers