From 81e0d73780362c3b2671bce9e49cb05930c747bc Mon Sep 17 00:00:00 2001
From: Brian Paul <brian.paul@tungstengraphics.com>
Date: Thu, 21 Sep 2006 15:16:36 +0000
Subject: GLUT_FORCE_VISUAL env var to force glut to use a particular visual
 (debug only)

---
 src/glut/glx/glut_win.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/src/glut/glx/glut_win.c b/src/glut/glx/glut_win.c
index 9b9e6e3022..0f48e0ba33 100644
--- a/src/glut/glx/glut_win.c
+++ b/src/glut/glx/glut_win.c
@@ -349,13 +349,30 @@ getVisualInfoRGB(unsigned int mode)
     __glutScreen, list);
 }
 
+static XVisualInfo *
+getVisualInfoID(int id)
+{
+   XVisualInfo temp;
+   int count;
+   temp.visualid = id;
+   return XGetVisualInfo(__glutDisplay, VisualIDMask, &temp, &count);
+}
+
+
 XVisualInfo *
 __glutGetVisualInfo(unsigned int mode)
 {
+  char *visStr;
   /* XXX GLUT_LUMINANCE not implemented for GLUT 3.0. */
   if (GLUT_WIND_IS_LUMINANCE(mode))
     return NULL;
 
+  visStr = getenv("GLUT_FORCE_VISUAL");
+  if (visStr) {
+     int id = atoi(visStr);
+     return getVisualInfoID(id);
+  }
+
   if (GLUT_WIND_IS_RGB(mode))
     return getVisualInfoRGB(mode);
   else
-- 
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