implement glad into torque.

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

@@ -33,11 +33,10 @@ namespace GL
 {
    void gglPerformBinds()
    {
-      // 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
+      if (!gladLoadGL()) 
+      {
+	     AssertFatal(false, "Unable to load GLAD. Make sure your OpenGL drivers are up to date!");
+      }
    }
 
    void gglPerformExtensionBinds(void *context)

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

@@ -23,11 +23,10 @@
 #ifndef T_GL_H
 #define T_GL_H
 
-#include <epoxy/gl.h>
+#include <glad/glad.h>
 
-// JTH: This is slow, we should probably check extensions once and cache them
-// directly inside of some compatability table.
-#define gglHasExtension(EXTENSION) epoxy_has_gl_extension("GL_" #EXTENSION)
+// JTH: When we use glad, extensions are chached into simple booleans (ints)
+#define gglHasExtension(EXTENSION) GLAD_GL_##EXTENSION
 
 #endif
 

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

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

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

@@ -28,9 +28,9 @@
 #ifdef TORQUE_OS_LINUX
 
 #include "tGL.h"
-#include <epoxy/glx.h>
+#include <glad/glad_glx.h>
 
-#define gglHasXExtension(display, screen, EXTENSION) epoxy_has_glx_extension(display, screen, "GLX_" # EXTENSION)
+#define gglHasXExtension(display, screen, EXTENSION) 
 
 #endif //TORQUE_OS_LINUX