Example/Debug Output Log

This example code shows how to get the first X messages from the debug output log.

void GetFirstNMessages(GLuint numMsgs)
{
	GLint maxMsgLen = 0;
	glGetIntegerv(GL_MAX_DEBUG_MESSAGE_LENGTH, &maxMsgLen);

	std::vector<GLchar> msgData(numMsgs * maxMsgLen);
	std::vector<GLenum> sources(numMsgs);
	std::vector<GLenum> types(numMsgs);
	std::vector<GLenum> severities(numMsgs);
	std::vector<GLuint> ids(numMsgs);
	std::vector<GLsizei> lengths(numMsgs);

	GLuint numFound = glGetDebugMessageLog(numMsgs, msgs.size(), &sources[0], &types[0], &ids[0], &severities[0], &lengths[0], &msgData[0]);

	sources.resize(numFound);
	types.resize(numFound);
	severities.resize(numFound);
	ids.resize(numFound);
	lengths.resize(numFound);

	std::vector<std::string> messages;
	messages.reserve(numFound);

	std::vector<GLchar>::iterator currPos = msgData.begin();
	for(size_t msg = 0; msg < lengths.size(); ++msg)
	{
		messages.push_back(std::string(currPos, currPos + lengths[msg] - 1));
		currPos = currPos + lengths[msg];
	}
}