torque windows integration of epoxy

Engine/source/gfx/gl/tGL/tGL.cpp

@@ -25,13 +25,19 @@
 #include "core/strings/stringFunctions.h"
 #include "console/console.h"
 
+#ifdef TORQUE_OS_WIN
+   #include "tWGL.h"
+#endif
+
 namespace GL
 {
    void gglPerformBinds()
    {
-      glewExperimental = GL_TRUE;
-      GLenum err = glewInit();
-      AssertFatal(GLEW_OK == err, avar("Error: %s\n", glewGetErrorString(err)) );
+      // JTH: epoxy has one oddity with windows. You need to bind the context
+      // after creating the context to udpate the internals of epoxy.
+#ifdef TORQUE_OS_WIN
+      epoxy_handle_external_wglMakeCurrent();
+#endif
    }
 
    void gglPerformExtensionBinds(void *context)

Engine/source/gfx/gl/tGL/tWGL.h

@@ -28,9 +28,9 @@
 #ifdef TORQUE_OPENGL
 
 #include "tGL.h"
-#include "GL/wglew.h"
+#include <epoxy/wgl.h>
 
-#define gglHasWExtension(EXTENSION) WGLEW_##EXTENSION
+#define gglHasWExtension(window, EXTENSION) epoxy_has_wgl_extension(window, "WGL_" # EXTENSION)
 
 #endif //TORQUE_OPENGL