From: Andrew Udvare <audvare@gmail.com>
Subject: [PATCH] Do not treat a missing GLX display as a GLEW failure

GLEW initialises GLX alongside GL, and a Wayland session has no GLX display,
so glewInit() returns GLEW_ERROR_NO_GLX_DISPLAY there even though every GL
entry point it was asked for resolved. Only the GL half is used here, so the
program aborted at startup with "System_Init failed" on any Wayland session.

Neither branch said anything before giving up, which is what made this worth
tracking down in the first place, so both now report themselves.

--- a/Source/SysGL/Graphics/GraphicsContextGL.cpp
+++ b/Source/SysGL/Graphics/GraphicsContextGL.cpp
@@ -126,9 +126,22 @@
 
 	SDL_GL_SetSwapInterval(1);
 
+	// GLEW initialises GLX alongside GL. There is no GLX display under Wayland,
+	// so it returns GLEW_ERROR_NO_GLX_DISPLAY even though every GL entry point
+	// it was asked for resolved; only the GL half is used here.
 	GLenum err = glewInit();
-	if (err != GLEW_OK || !GLEW_VERSION_3_2)
+	if (err != GLEW_OK && err != GLEW_ERROR_NO_GLX_DISPLAY)
 	{
+		printf( "GLEW could not initialize! GLEW Error: %s\n", (const char *)glewGetErrorString(err) );
+		SDL_DestroyWindow(gWindow);
+		gWindow = NULL;
+		//SDL_Quit();
+		return false;
+	}
+
+	if (!GLEW_VERSION_3_2)
+	{
+		printf( "OpenGL 3.2 is required, but this context reports %s\n", (const char *)glGetString(GL_VERSION) );
 		SDL_DestroyWindow(gWindow);
 		gWindow = NULL;
 		//SDL_Quit();