Centralize OpenGL headers to centralize Mac port ifdefs

git-svn-id: http://svn.net-core.org/repos/t-engine4@609 51575b47-30f0-44d4-a5cc-537603b46e54

src/display_sdl.h

@@ -22,9 +22,7 @@
 #define DISPLAY_SDL_H
 
 #include "tSDL.h"
-#include <gl.h>
-#include <glu.h>
-#include <glext.h>
+#include "tgl.h"
 
 #ifdef __cplusplus
 extern "C" {

src/map.h

@@ -21,7 +21,7 @@
 #ifndef _MAP_H_
 #define _MAP_H_
 
-#include <gl.h>
+#include "tgl.h"
 
 typedef struct {
 	GLuint **grids_terrain;

src/particles.h

@@ -21,7 +21,7 @@
 #ifndef _PARTICLES_H_
 #define _PARTICLES_H_
 
-#include <gl.h>
+#include "tgl.h"
 
 typedef struct {
 	float size, sizev, sizea;

src/tgl.h

+#ifdef __APPLE__
+#include <OpenGL/gl.h>
+#include <OpenGL/glu.h>
+#include <OpenGL/glext.h>
+#else
+#include <gl.h>
+#include <glu.h>
+#include <glext.h>
+#endif