gldebug.cpp

#include <stdio.h>
#include <epoxy/gl.h> // replace with proper include

void gl_debug_callback(GLenum source, GLenum type, GLuint id, 
		GLenum severity, GLsizei length, 
		const char *message, const void *) {
	const char *sev = "";
	switch (severity) {
		case GL_DEBUG_SEVERITY_HIGH: sev = "\e[91m"; break;
		case GL_DEBUG_SEVERITY_MEDIUM: sev = "\e[93m"; break;
		case GL_DEBUG_SEVERITY_LOW: sev = "\e[92m"; break;
		case GL_DEBUG_SEVERITY_NOTIFICATION: sev = "\e[34m"; break;
	}

	const char *src = "?";
	switch (source) {
		case GL_DEBUG_SOURCE_API: src = "API"; break;
		case GL_DEBUG_SOURCE_WINDOW_SYSTEM: src = "window system"; break;
		case GL_DEBUG_SOURCE_SHADER_COMPILER: src = "shader compiler"; break;
		case GL_DEBUG_SOURCE_THIRD_PARTY: src = "third party"; break;
		case GL_DEBUG_SOURCE_APPLICATION: src = "app"; break;
		case GL_DEBUG_SOURCE_OTHER: src = "other"; break;
	}

	const char *type_str = "?";
	switch (type) {
		case GL_DEBUG_TYPE_ERROR: type_str = "error"; break;
		case GL_DEBUG_TYPE_DEPRECATED_BEHAVIOR: type_str = "deprecated behavior"; break;
		case GL_DEBUG_TYPE_UNDEFINED_BEHAVIOR: type_str = "undefined behavior"; break;
		case GL_DEBUG_TYPE_PORTABILITY: type_str = "portability"; break;
		case GL_DEBUG_TYPE_MARKER: type_str = "marker"; break;
		case GL_DEBUG_TYPE_PUSH_GROUP: type_str = "push group"; break;
		case GL_DEBUG_TYPE_POP_GROUP: type_str = "pop group"; break;
		case GL_DEBUG_TYPE_OTHER: type_str = "other"; break;
	}

	fprintf(stderr, "debug:%s type: %s, source: %s, message: \"%.*s\"\e[0m\n", sev, type_str, src, length, message);
}

int init_debug() {
	glEnable(GL_DEBUG_OUTPUT);
#ifndef NDEBUG
	glEnable(GL_DEBUG_OUTPUT_SYNCHRONOUS); // disable if in release
#endif
	glDebugMessageCallback(gl_debug_callback, nullptr);
	
	// this disables messages printed for successfully compiled shaders
	glDebugMessageControl(GL_DEBUG_SOURCE_SHADER_COMPILER, GL_DEBUG_TYPE_OTHER, GL_DEBUG_SEVERITY_NOTIFICATION, 0, nullptr, GL_FALSE);
}