-typedef ptrdiff_t fghGLsizeiptr;
-typedef void (APIENTRY *PFNGLGENBUFFERSPROC) (GLsizei n, GLuint *buffers);
-typedef void (APIENTRY *PFNGLBINDBUFFERPROC) (GLenum target, GLuint buffer);
-typedef void (APIENTRY *PFNGLBUFFERDATAPROC) (GLenum target, fghGLsizeiptr size, const GLvoid *data, GLenum usage);
-typedef void (APIENTRY *PFNGLDELETEBUFFERSPROC) (GLsizei n, const GLuint* buffers);
-typedef void (APIENTRY *PFNGLENABLEVERTEXATTRIBARRAYPROC) (GLuint index);
-typedef void (APIENTRY *PFNGLDISABLEVERTEXATTRIBARRAYPROC) (GLuint);
-typedef void (APIENTRY *PFNGLVERTEXATTRIBPOINTERPROC) (GLuint index, GLint size, GLenum type, GLboolean normalized, GLsizei stride, const GLvoid *pointer);
+typedef int fghGLsizeiptr;
+typedef void (APIENTRY *FGH_PFNGLGENBUFFERSPROC) (GLsizei n, GLuint *buffers);
+typedef void (APIENTRY *FGH_PFNGLBINDBUFFERPROC) (GLenum target, GLuint buffer);
+typedef void (APIENTRY *FGH_PFNGLBUFFERDATAPROC) (GLenum target, fghGLsizeiptr size, const GLvoid *data, GLenum usage);
+typedef void (APIENTRY *FGH_PFNGLDELETEBUFFERSPROC) (GLsizei n, const GLuint* buffers);
+typedef void (APIENTRY *FGH_PFNGLENABLEVERTEXATTRIBARRAYPROC) (GLuint index);
+typedef void (APIENTRY *FGH_PFNGLDISABLEVERTEXATTRIBARRAYPROC) (GLuint);
+typedef void (APIENTRY *FGH_PFNGLVERTEXATTRIBPOINTERPROC) (GLuint index, GLint size, GLenum type, GLboolean normalized, GLsizei stride, const GLvoid *pointer);