From 5eb5039d38d1f6c3cc522138b3e9f4dd31066e79 Mon Sep 17 00:00:00 2001
From: Josh Holtrop <jholtrop@gmail.com>
Date: Fri, 20 Jan 2017 15:07:04 -0500
Subject: [PATCH] more stderr messages when gl3w fails to load

---
 src/gui/Window.cc | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/gui/Window.cc b/src/gui/Window.cc
index 52235bd..0a6a548 100644
--- a/src/gui/Window.cc
+++ b/src/gui/Window.cc
@@ -53,12 +53,22 @@ static bool Initialize_OpenGL()
 {
     if (gl3wInit() != 0)
     {
+        std::cerr << "Failed to initialize gl3w." << std::endl;
+
         /* Failed to gl3wInit() */
         return false;
     }
 
     if (!gl3wIsSupported(3, 0))
     {
+        std::cerr << "Error: OpenGL 3.0 is required." << std::endl;
+
+        std::cerr << "OpenGL version: "
+            << glGetString(GL_VERSION)
+            << ", GLSL: "
+            << glGetString(GL_SHADING_LANGUAGE_VERSION)
+            << std::endl;
+
         /* OpenGL 3.0 is not supported */
         return false;
     }