From f7e84df33278eacdfd17d97daac4352ea3a6055c Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Sun, 31 Dec 2017 08:36:50 +0530
Subject: [PATCH] Add an explicit OpenGL version test

Apparently there are some pre 3.3 drivers that include the
texture_storage extension. Fixes #258
---
 kitty/gl.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/kitty/gl.h b/kitty/gl.h
index 1b137962c..116339163 100644
--- a/kitty/gl.h
+++ b/kitty/gl.h
@@ -59,6 +59,9 @@ gl_init() {
         ARB_TEST(texture_storage);
 #undef ARB_TEST
         glad_loaded = true;
+        if (GLVersion.major < 3 || (GLVersion.major == 3 && GLVersion.minor < 3)) {
+            fatal("OpenGL version is %d.%d, version >= 3.3 required for kitty", GLVersion.major, GLVersion.minor);
+        }
     }
 }