#ifndef __SG_EXTENSIONS_HXX
#define __SG_EXTENSIONS_HXX 1
-#if defined(WIN32) && !defined(__CYGWIN__) && !defined(__MINGW32__)
-# include <windows.h>
-#else
-# include <dlfcn.h>
-#endif
-#include <GL/gl.h>
+#include <simgear/compiler.h>
-
-#if defined(__cplusplus)
-extern "C" {
-#endif
-
-#ifndef APIENTRY
-#define APIENTRY
-#endif
-
-static bool SGSearchExtensionsString(char *extString, char *extName);
-bool SGIsOpenGLExtensionSupported(char *extName);
-
-#ifdef __APPLE__
- // don't use an inline function for symbol lookup, since it is too big
- void* macosxGetGLProcAddress(const char *func);
-#endif
-
-inline void (*SGLookupFunction(const char *func))()
-{
-#if defined( WIN32 ) && !defined(__CYGWIN__) && !defined(__MINGW32__)
- return (void (*)()) wglGetProcAddress(func);
-
-#elif defined( __APPLE__ )
- return (void (*)()) macosxGetGLProcAddress(func);
-
-#else // UNIX
-
- // If the target system s UNIX and the ARB_get_proc_address
- // GLX extension is *not* guaranteed to be supported. An alternative
- // dlsym-based approach will be used instead.
-
- void *libHandle;
- void (*fptr)();
- libHandle = dlopen("libGL.so", RTLD_LAZY);
- fptr = (void (*)()) dlsym(libHandle, func);
- dlclose(libHandle);
- return fptr;
-#endif
-}
-
-
-
-/* OpenGL extension declarations */
-#ifndef GL_EXT_point_parameters
-#define GL_POINT_SIZE_MIN_EXT 0x8126
-#define GL_DISTANCE_ATTENUATION_EXT 0x8129
-#endif
-
-#ifndef GL_ARB_point_parameters
-#define GL_POINT_SIZE_MIN_ARB 0x8126
-#define GL_DISTANCE_ATTENUATION_ARB 0x8129
-#endif
-
-typedef void (APIENTRY * glPointParameterfProc)(GLenum pname, GLfloat param);
-typedef void (APIENTRY * glPointParameterfvProc)(GLenum pname, const GLfloat *params);
-
-#if defined(__cplusplus)
-}
-#endif
+bool SGSearchExtensionsString(const char *extString, const char *extName);
+bool SGIsOpenGLExtensionSupported(const char *extName);
#endif // !__SG_EXTENSIONS_HXX