From c086f0d24e6ca666a2567c092b2c368d7b683069 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Jos=C3=A9=20Fonseca?= <jose.r.fonseca@gmail.com>
Date: Thu, 9 Feb 2012 13:15:15 +0000
Subject: [PATCH] Allow to specify an alternative opengl32.dll when retracing.

---
 glws_wgl.cpp | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/glws_wgl.cpp b/glws_wgl.cpp
index 59f4786..5fddb79 100644
--- a/glws_wgl.cpp
+++ b/glws_wgl.cpp
@@ -23,6 +23,8 @@
  *
  **************************************************************************/
 
+#include <iostream>
+
 #include "glproc.hpp"
 #include "glws.hpp"
 
@@ -199,7 +201,18 @@ init(void) {
     /*
      * OpenGL library must be loaded by the time we call GDI.
      */
-    __libGlHandle = LoadLibraryA("OPENGL32");
+
+    const char * libgl_filename = getenv("TRACE_LIBGL");
+
+    if (!libgl_filename) {
+        libgl_filename = "OPENGL32";
+    }
+
+    __libGlHandle = LoadLibraryA(libgl_filename);
+    if (!__libGlHandle) {
+        std::cerr << "error: unable to open " << libgl_filename << "\n";
+        exit(1);
+    }
 }
 
 void
-- 
2.45.2