From 171a20cb6d63161da2d1f73099ac5476b25709a3 Mon Sep 17 00:00:00 2001
From: Brandon Wright <bearoso@gmail.com>
Date: Mon, 28 May 2018 18:40:29 -0500
Subject: [PATCH] Use some more compatible OpenGL version checking.

---
 shaders/shader_helpers.cpp | 8 ++++----
 win32/COpenGL.cpp          | 3 ++-
 2 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/shaders/shader_helpers.cpp b/shaders/shader_helpers.cpp
index e329ea33..ca80df7f 100644
--- a/shaders/shader_helpers.cpp
+++ b/shaders/shader_helpers.cpp
@@ -35,14 +35,14 @@ bool gl_version_at_least (int maj, int min)
 
     if (major_version < 0 || minor_version < 0)
     {
-        glGetIntegerv (GL_MAJOR_VERSION, &major_version);
-        glGetIntegerv (GL_MINOR_VERSION, &minor_version);
+        const char *version_string = (const char *) glGetString (GL_VERSION);
+        sscanf (version_string, "%d.%d", &major_version, &minor_version);
     }
 
-    if (maj > major_version)
+    if (major_version > maj)
         return true;
 
-    if (maj == major_version && min >= minor_version)
+    if (maj == major_version && minor_version >= min)
         return true;
 
     return false;
diff --git a/win32/COpenGL.cpp b/win32/COpenGL.cpp
index ff71a9b3..91b45a60 100644
--- a/win32/COpenGL.cpp
+++ b/win32/COpenGL.cpp
@@ -953,12 +953,13 @@ bool COpenGL::ShaderAailable()
 bool COpenGL::NPOTAvailable()
 {
     const char *extensions = (const char *)glGetString(GL_EXTENSIONS);
+    const char *version = (const char *)glGetString(GL_VERSION);
 
     if (!extensions)
         return false;
 
     int glVersionMajor = 0;
-    glGetIntegerv(GL_MAJOR_VERSION, &glVersionMajor);
+    glVersionMajor = atoi (version);
 
     if (glVersionMajor >= 2)
         return true;