From 7e40f80f52ea0ba35ca6e4ffd40a6fc8c0fa7536 Mon Sep 17 00:00:00 2001
From: hobby8 <hobby8@users.noreply.github.com>
Date: Sat, 6 Oct 2018 22:49:48 +0300
Subject: [PATCH] Fix OpenGL extensions not loading

---
 src/SFML/Window/GlContext.cpp | 22 +++++++++-------------
 1 file changed, 9 insertions(+), 13 deletions(-)

diff --git a/src/SFML/Window/GlContext.cpp b/src/SFML/Window/GlContext.cpp
index 39dc9339a..fd3805d47 100644
--- a/src/SFML/Window/GlContext.cpp
+++ b/src/SFML/Window/GlContext.cpp
@@ -218,10 +218,12 @@ namespace
         extensions.clear();
 
         // Check whether a >= 3.0 context is available
+        glGetStringiFuncType glGetStringiFunc = NULL;
+        glGetStringiFunc = reinterpret_cast<glGetStringiFuncType>(sf::priv::GlContext::getFunction("glGetStringi"));
         int majorVersion = 0;
         glGetIntegerv(GL_MAJOR_VERSION, &majorVersion);
 
-        if (glGetError() == GL_INVALID_ENUM)
+        if (glGetError() == GL_INVALID_ENUM || !glGetStringiFunc)
         {
             // Try to load the < 3.0 way
             const char* extensionString = reinterpret_cast<const char*>(glGetString(GL_EXTENSIONS));
@@ -240,22 +242,16 @@ namespace
         else
         {
             // Try to load the >= 3.0 way
-            glGetStringiFuncType glGetStringiFunc = NULL;
-            glGetStringiFunc = reinterpret_cast<glGetStringiFuncType>(sf::priv::GlContext::getFunction("glGetStringi"));
+            int numExtensions = 0;
+            glGetIntegerv(GL_NUM_EXTENSIONS, &numExtensions);
 
-            if (glGetStringiFunc)
+            if (numExtensions)
             {
-                int numExtensions = 0;
-                glGetIntegerv(GL_NUM_EXTENSIONS, &numExtensions);
-
-                if (numExtensions)
+                for (unsigned int i = 0; i < static_cast<unsigned int>(numExtensions); ++i)
                 {
-                    for (unsigned int i = 0; i < static_cast<unsigned int>(numExtensions); ++i)
-                    {
-                        const char* extensionString = reinterpret_cast<const char*>(glGetStringiFunc(GL_EXTENSIONS, i));
+                    const char* extensionString = reinterpret_cast<const char*>(glGetStringiFunc(GL_EXTENSIONS, i));
 
-                        extensions.push_back(extensionString);
-                    }
+                    extensions.push_back(extensionString);
                 }
             }
         }