GL_ARB_timer_query http://www.opengl.org/registry/specs/ARB/timer_query.txt GL_ARB_timer_query GL_TIME_ELAPSED 0x88BF GL_TIMESTAMP 0x8E28 void glGetQueryObjecti64v (GLuint id, GLenum pname, GLint64* params) void glGetQueryObjectui64v (GLuint id, GLenum pname, GLuint64* params) void glQueryCounter (GLuint id, GLenum target)