1. Try to get Core 4.5 Debug Context; 2. If failed, try to get any (debug)...

1. Try to get Core 4.5 Debug Context; 2. If failed, try to get any (debug) context; 3. If GL version < 3.3 try to get any 3.3 context (intel bug workaround).

glfw/glow-extras/glfw/GlfwApp.cc

@@ -529,14 +529,20 @@ int GlfwApp::run(int argc, char *argv[])
     // Request debug context
     glfwWindowHint(GLFW_OPENGL_DEBUG_CONTEXT, GL_TRUE);
 
+    // Try to get core context 4.5
+    glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
+    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 4);
+    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 5);
+
     // Create a windowed mode window and its OpenGL context
     mWindow = glfwCreateWindow(mWindowWidth, mWindowHeight, mTitle.c_str(), NULL, NULL);
     if (!mWindow)
     {
-        std::cerr << "Unable to create a GLFW window with OpenGL Debug Context. Trying to create one without advanced "
-                     "debugging support."
-                  << std::endl;
+        std::cerr << "Unable to get OpenGL 4.5 Core Debug Context. Trying again with Compat." << std::endl;
         glfwWindowHint(GLFW_OPENGL_DEBUG_CONTEXT, GL_FALSE);
+        glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_ANY_PROFILE);
+        glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 1);
+        glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 0);
         mWindow = glfwCreateWindow(mWindowWidth, mWindowHeight, mTitle.c_str(), NULL, NULL);
 
         if (!mWindow)
@@ -571,6 +577,7 @@ int GlfwApp::run(int argc, char *argv[])
         // request vanilla 3.3 context
         glfwDefaultWindowHints();
         glfwWindowHint(GLFW_OPENGL_DEBUG_CONTEXT, GL_FALSE);
+        glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_ANY_PROFILE);
         glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
         glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);