[Mesa-dev] [PATCH] intel: Set ctx's drawbuffer according to drawables visual

[Benjamin Franzke]

Fixes https://bugs.freedesktop.org/show_bug.cgi?id=39588

egl_dri2 creates contexts with a doubleBufferConfig when PIXMAP and
WINDOW bit is request, so _mesa_init_color sets DrawBuffer[0] to
GL_BACK.
If a pixmap surface is created egl_dri2 will use a single buffer config,
so MakeCurrent has to adjust DrawBuffer[0] to the current drawable.
---
 src/mesa/drivers/dri/intel/intel_context.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/src/mesa/drivers/dri/intel/intel_context.c b/src/mesa/drivers/dri/intel/intel_context.c
index fe8be08..0eeffc0 100644
--- a/src/mesa/drivers/dri/intel/intel_context.c
+++ b/src/mesa/drivers/dri/intel/intel_context.c
@@ -970,6 +970,12 @@ intelMakeCurrent(__DRIcontext * driContextPriv,
 	 readFb = driReadPriv->driverPrivate;
 	 driContextPriv->dri2.draw_stamp = driDrawPriv->dri2.stamp - 1;
 	 driContextPriv->dri2.read_stamp = driReadPriv->dri2.stamp - 1;
+
+         if (fb->Visual.doubleBufferMode) {
+            intel->ctx.Color.DrawBuffer[0] = GL_BACK;
+         } else {
+            intel->ctx.Color.DrawBuffer[0] = GL_FRONT;
+         }
       }
 
       intel_prepare_render(intel);
-- 
1.7.3.4