Add GLUT_ALPHA for softpipe
diff --git a/progs/trivial/clear.c b/progs/trivial/clear.c
index 7e7ca58..69931b5 100644
--- a/progs/trivial/clear.c
+++ b/progs/trivial/clear.c
@@ -108,7 +108,7 @@
 
     glutInitWindowPosition(0, 0); glutInitWindowSize( 250, 250);
 
-    type = GLUT_RGB;
+    type = GLUT_RGB | GLUT_ALPHA;
     type |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE;
     glutInitDisplayMode(type);