text: GL_ARB_debug_output
  http://www.opengl.org/registry/specs/ARB/debug_output.txt
  GL_ARB_debug_output
  	GL_DEBUG_OUTPUT_SYNCHRONOUS_ARB 0x8242
  	GL_DEBUG_NEXT_LOGGED_MESSAGE_LENGTH_ARB 0x8243
  	GL_DEBUG_CALLBACK_FUNCTION_ARB 0x8244
  	GL_DEBUG_CALLBACK_USER_PARAM_ARB 0x8245
  	GL_DEBUG_SOURCE_API_ARB 0x8246
  	GL_DEBUG_SOURCE_WINDOW_SYSTEM_ARB 0x8247
  	GL_DEBUG_SOURCE_SHADER_COMPILER_ARB 0x8248
  	GL_DEBUG_SOURCE_THIRD_PARTY_ARB 0x8249
  	GL_DEBUG_SOURCE_APPLICATION_ARB 0x824A
  	GL_DEBUG_SOURCE_OTHER_ARB 0x824B
  	GL_DEBUG_TYPE_ERROR_ARB 0x824C
  	GL_DEBUG_TYPE_DEPRECATED_BEHAVIOR_ARB 0x824D
  	GL_DEBUG_TYPE_UNDEFINED_BEHAVIOR_ARB 0x824E
  	GL_DEBUG_TYPE_PORTABILITY_ARB 0x824F
  	GL_DEBUG_TYPE_PERFORMANCE_ARB 0x8250
  	GL_DEBUG_TYPE_OTHER_ARB 0x8251
  	GL_MAX_DEBUG_MESSAGE_LENGTH_ARB 0x9143
  	GL_MAX_DEBUG_LOGGED_MESSAGES_ARB 0x9144
  	GL_DEBUG_LOGGED_MESSAGES_ARB 0x9145
  	GL_DEBUG_SEVERITY_HIGH_ARB 0x9146
  	GL_DEBUG_SEVERITY_MEDIUM_ARB 0x9147
  	GL_DEBUG_SEVERITY_LOW_ARB 0x9148
  	void glDebugMessageCallbackARB (GLDEBUGPROCARB callback, const void *userParam)
  	void glDebugMessageControlARB (GLenum source, GLenum type, GLenum severity, GLsizei count, const GLuint* ids, GLboolean enabled)
  	void glDebugMessageInsertARB (GLenum source, GLenum type, GLuint id, GLenum severity, GLsizei length, const GLchar* buf)
  	GLuint glGetDebugMessageLogARB (GLuint count, GLsizei bufSize, GLenum* sources, GLenum* types, GLuint* ids, GLenum* severities, GLsizei* lengths, GLchar* messageLog)
  	typedef void (GLAPIENTRY *GLDEBUGPROCARB)(GLenum source, GLenum type, GLuint id, GLenum severity, GLsizei length, const GLchar* message, const void* userParam)
  