mac opengl support. proper coordinate flipping

include/Mw/LowLevel/Cocoa.h

@@ -119,6 +119,7 @@
 - (void)destroy;
 
 - (NSWindow *)parentWindow;
+- (NSView *)getView;
 
 @end
 #define OBJC(x) x

include/Mw/Widget/OpenGL.h

@@ -5,17 +5,24 @@
 #ifndef __MW_WIDGET_OPENGL_H__
 #define __MW_WIDGET_OPENGL_H__
 
+#include <Mw/Core.h>
 #include <Mw/MachDep.h>
 #include <Mw/TypeDefs.h>
-#include <Mw/Core.h>
 
 #if !defined(MW_OPENGL_NO_INCLUDE) && !defined(__gl_h_)
 #ifdef _WIN32
 #include <windows.h>
+#elif defined(__APPLE__)
 #else
 #include <GL/glx.h>
 #endif
+#if defined(__APPLE__)
+#include <OpenGL/gl.h>
+#include <OpenGL/glu.h>
+#else
 #include <GL/gl.h>
+#include <GL/glu.h>
+#endif
 
 #ifndef GLAPIENTRY
 #define GLAPIENTRY APIENTRY
@@ -36,7 +43,7 @@ MWDECL MwClass MwOpenGLClass;
  * @param handle Widget
  */
 MwInline void MwOpenGLMakeCurrent(MwWidget handle) {
-	MwVaWidgetExecute(handle, "mwOpenGLMakeCurrent", NULL);
+  MwVaWidgetExecute(handle, "mwOpenGLMakeCurrent", NULL);
 }
 
 /*!
@@ -45,10 +52,10 @@ MwInline void MwOpenGLMakeCurrent(MwWidget handle) {
  * @param name Name
  * @return Procedure
  */
-MwInline void* MwOpenGLGetProcAddress(MwWidget handle, const char* name) {
-	void* out;
-	MwVaWidgetExecute(handle, "mwOpenGLGetProcAddress", &out, name);
-	return out;
+MwInline void *MwOpenGLGetProcAddress(MwWidget handle, const char *name) {
+  void *out;
+  MwVaWidgetExecute(handle, "mwOpenGLGetProcAddress", &out, name);
+  return out;
 }
 
 /*!
@@ -56,7 +63,7 @@ MwInline void* MwOpenGLGetProcAddress(MwWidget handle, const char* name) {
  * @param handle Widget
  */
 MwInline void MwOpenGLSwapBuffer(MwWidget handle) {
-	MwVaWidgetExecute(handle, "mwOpenGLSwapBuffer", NULL);
+  MwVaWidgetExecute(handle, "mwOpenGLSwapBuffer", NULL);
 }
 
 #ifdef __cplusplus