GL_AMD_performance_monitor
http://www.opengl.org/registry/specs/AMD/performance_monitor.txt
GL_AMD_performance_monitor
	GL_COUNTER_TYPE_AMD 0x8BC0
	GL_COUNTER_RANGE_AMD 0x8BC1
	GL_UNSIGNED_INT64_AMD 0x8BC2
	GL_PERCENTAGE_AMD 0x8BC3
	GL_PERFMON_RESULT_AVAILABLE_AMD 0x8BC4
	GL_PERFMON_RESULT_SIZE_AMD 0x8BC5
	GL_PERFMON_RESULT_AMD 0x8BC6
	void glBeginPerfMonitorAMD (GLuint monitor)
	void glDeletePerfMonitorsAMD (GLsizei n, GLuint* monitors)
	void glEndPerfMonitorAMD (GLuint monitor)
	void glGenPerfMonitorsAMD (GLsizei n, GLuint* monitors)
	void glGetPerfMonitorCounterDataAMD (GLuint monitor, GLenum pname, GLsizei dataSize, GLuint* data, GLint *bytesWritten)
	void glGetPerfMonitorCounterInfoAMD (GLuint group, GLuint counter, GLenum pname, void *data)
	void glGetPerfMonitorCounterStringAMD (GLuint group, GLuint counter, GLsizei bufSize, GLsizei* length, GLchar *counterString)
	void glGetPerfMonitorCountersAMD (GLuint group, GLint* numCounters, GLint *maxActiveCounters, GLsizei countersSize, GLuint *counters)
	void glGetPerfMonitorGroupStringAMD (GLuint group, GLsizei bufSize, GLsizei* length, GLchar *groupString)
	void glGetPerfMonitorGroupsAMD (GLint* numGroups, GLsizei groupsSize, GLuint *groups)
	void glSelectPerfMonitorCountersAMD (GLuint monitor, GLboolean enable, GLuint group, GLint numCounters, GLuint* counterList)
