Test either GL_FRONT_LEFT or GL_FRONT for front-buffer rendering

For non-stereo visuals, which is all we support, we treat
GL_FRONT_LEFT as GL_FRONT.  However, they are technically different,
and they have different enum values.  Test for either one to determine
if we're in front-buffer rendering mode.

This fix was suggested by Pierre Willenbrock.

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
(cherry picked from commit 2085cf24628be7cd297ab0f9ef5ce02bd5a006e2)

diff --git a/src/mesa/drivers/dri/intel/intel_buffers.c b/src/mesa/drivers/dri/intel/intel_buffers.c
index ecac5bf..b86cafe 100644 (file)
--- a/src/mesa/drivers/dri/intel/intel_buffers.c
+++ b/src/mesa/drivers/dri/intel/intel_buffers.c
@@ -326,7 +326,8 @@ intelDrawBuffer(GLcontext * ctx, GLenum mode)
       const GLboolean was_front_buffer_rendering =
        intel->is_front_buffer_rendering;
 
-      intel->is_front_buffer_rendering = (mode == GL_FRONT_LEFT);
+      intel->is_front_buffer_rendering = (mode == GL_FRONT_LEFT)
+       || (mode == GL_FRONT);
 
       /* If we weren't front-buffer rendering before but we are now, make sure
        * that the front-buffer has actually been allocated.