extern void (GLAPIENTRY *qglViewport)(GLint x, GLint y, GLsizei width, GLsizei height);
//extern void (GLAPIENTRY *qglPushMatrix)(void);
//extern void (GLAPIENTRY *qglPopMatrix)(void);
-//extern void (GLAPIENTRY *qglLoadIdentity)(void);
+extern void (GLAPIENTRY *qglLoadIdentity)(void);
//extern void (GLAPIENTRY *qglLoadMatrixd)(const GLdouble *m);
extern void (GLAPIENTRY *qglLoadMatrixf)(const GLfloat *m);
//extern void (GLAPIENTRY *qglMultMatrixd)(const GLdouble *m);