[grits] Fix depth buffer glitches

[Andy Spencer <andys src gnome org>]

commit 0b8cdeb4cdbbd3138d53eec7efa8635ea5fdb3fd
Author: Andy Spencer <andy753421 gmail com>
Date:   Wed May 23 04:37:58 2012 +0000

    Fix depth buffer glitches

 src/grits-opengl.c |    7 ++++---
 1 files changed, 4 insertions(+), 3 deletions(-)
---
diff --git a/src/grits-opengl.c b/src/grits-opengl.c
index 1aec412..a2dce84 100644
--- a/src/grits-opengl.c
+++ b/src/grits-opengl.c
@@ -307,11 +307,9 @@ static void _draw_level(gpointer _level, gpointer _opengl)
 		/* Enable depth and alpha for world levels */
 		glEnable(GL_ALPHA_TEST);
 		glAlphaFunc(GL_GREATER, 0.1);
-		glDepthMask(TRUE);
 	} else {
 		/* Disable depth for Overlay/HUD levels */
-		// This causes rendering glitches not sure why..
-		//glDepthMask(FALSE);
+		glDepthMask(FALSE);
 	}
 
 	/* Start ortho */
@@ -341,6 +339,9 @@ static void _draw_level(gpointer _level, gpointer _opengl)
 		glMatrixMode(GL_MODELVIEW);  glPopMatrix();
 	}
 
+	/* Leave depth buffer write enabled */
+	glDepthMask(TRUE);
+
 	/* TODO: Prune empty levels */
 
 	g_debug("GritsOpenGL: _draw_level - drew %d,%d objects",