Add debug callback

gldebug.hpp

@@ -0,0 +1,80 @@
+#pragma once
+
+#ifndef NDEBUG
+
+void GLAPIENTRY log_gl_debug_callback(
+    GLenum source,
+    GLenum type,
+    GLuint id,
+    GLenum severity,
+    GLsizei length,
+    const GLchar *message,
+    const void *userParam
+) {
+    std::string s_source;
+    switch(type){
+        case GL_DEBUG_SOURCE_API:
+            s_source = "API:";
+        case GL_DEBUG_SOURCE_WINDOW_SYSTEM:
+            s_source = "WINDOW:";
+        case GL_DEBUG_SOURCE_SHADER_COMPILER:
+            s_source = "SHADER:";
+        case GL_DEBUG_SOURCE_THIRD_PARTY:
+            s_source = "3P:";
+        case GL_DEBUG_SOURCE_APPLICATION:
+            s_source = "APP:";
+        default:
+            s_source = "";
+    }
+
+    std::string s_type;
+    switch (type) {
+    case GL_DEBUG_TYPE_ERROR:
+        s_type = "ERROR:";
+        break;
+    case GL_DEBUG_TYPE_DEPRECATED_BEHAVIOR:
+        s_type = "DEPRECATED:";
+        break;
+    case GL_DEBUG_TYPE_UNDEFINED_BEHAVIOR:
+        s_type = "UNDEFINED:";
+        break;
+    case GL_DEBUG_TYPE_PORTABILITY:
+        s_type = "PORTABILITY:";
+        break;
+    case GL_DEBUG_TYPE_PERFORMANCE:
+        s_type = "PERFORMANCE:";
+        break;
+    case GL_DEBUG_TYPE_MARKER:
+        s_type = "MARKER:";
+        break;
+    case GL_DEBUG_TYPE_PUSH_GROUP:
+        s_type = "PUSH_GROUP:";
+        break;
+    case GL_DEBUG_TYPE_POP_GROUP:
+        s_type = "POP_GROUP:";
+        break;
+    default:
+        s_type = "";
+        break;
+    }
+
+    std::string s_severity;
+    switch (severity) {
+    case GL_DEBUG_SEVERITY_HIGH:
+        s_severity = "HIGH:";
+        break;
+    case GL_DEBUG_SEVERITY_MEDIUM:
+        s_severity = "MED:";
+        break;
+    case GL_DEBUG_SEVERITY_LOW:
+        s_severity = "LOW:";
+        break;
+    default:
+        s_severity = "INFO:";
+        break;
+    }
+
+    std::cerr << "GL:" << s_source << s_type << s_severity << " " << message << std::endl;
+}
+
+#endif

main.cpp

@@ -5,6 +5,8 @@
 #include <backends/imgui_impl_opengl3.h>
 #include <iostream>
 
+#include "gldebug.hpp"
+
 void show_overlay() {
     ImGuiWindowFlags window_flags = ImGuiWindowFlags_None
         | ImGuiWindowFlags_NoDecoration