2 files changed, 57 insertions, 24 deletions

diff --git a/src/main/java/makamys/neodymium/Compat.java b/src/main/java/makamys/neodymium/Compat.java
index 92bc190..56b5360 100644
--- a/src/main/java/makamys/neodymium/Compat.java
+++ b/src/main/java/makamys/neodymium/Compat.java
@@ -13,6 +13,9 @@ import net.minecraft.client.Minecraft;
 import net.minecraft.client.renderer.Tessellator;
 
 public class Compat {
+    
+    private static boolean wasAdvancedOpenGLEnabled;
+    
     public static void applyCompatibilityTweaks() {
         if (Loader.isModLoaded("triangulator")) {
             disableTriangulator();
@@ -51,4 +54,16 @@ public class Compat {
             criticalWarns.add("OpenGL 3.3 is not supported.");
         }
     }
+
+    public static boolean hasChanged() {
+        boolean changed = false;
+        
+        boolean advGL = Minecraft.getMinecraft().gameSettings.advancedOpengl;
+        if(advGL != wasAdvancedOpenGLEnabled) {
+            changed = true;
+        }
+        wasAdvancedOpenGLEnabled = advGL;
+        
+        return changed;
+    }
 }
diff --git a/src/main/java/makamys/neodymium/Neodymium.java b/src/main/java/makamys/neodymium/Neodymium.java
index 7026bd9..de06451 100644
--- a/src/main/java/makamys/neodymium/Neodymium.java
+++ b/src/main/java/makamys/neodymium/Neodymium.java
@@ -3,6 +3,7 @@ package makamys.neodymium;
 import java.util.ArrayList;
 import java.util.List;
 
+import org.apache.commons.lang3.tuple.Pair;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 
@@ -93,31 +94,10 @@ public class Neodymium
             destroyRenderer();
         }
     	if(Config.enabled && newWorld != null) {
-    	    List<String> warns = new ArrayList<>();
-    	    List<String> criticalWarns = new ArrayList<>();
+    	    Pair<List<String>, List<String>> warnsAndCriticalWarns = checkCompat();
+    	    List<String> warns = warnsAndCriticalWarns.getLeft();
+    	    List<String> criticalWarns = warnsAndCriticalWarns.getRight();
     	    
-    	    Compat.getCompatibilityWarnings(warns, criticalWarns);
-    	    
-    	    if(!criticalWarns.isEmpty()) {
-    	        criticalWarns.add("Neodymium has been disabled due to a critical incompatibility.");
-    	    }
-    	    
-    	    if(!Config.ignoreIncompatibilities) {
-        	    for(String warn : warns) {
-        	        ChatUtil.showNeoChatMessage(warn, ChatUtil.MessageVerbosity.WARNING, true);
-        	    }
-        	    for(String fatalWarn : criticalWarns) {
-                    ChatUtil.showNeoChatMessage(fatalWarn, ChatUtil.MessageVerbosity.ERROR, true);
-                }
-    	    }
-    	    
-    	    for(String warn : warns) {
-                LOGGER.warn(warn);
-            }
-            for(String criticalWarn : criticalWarns) {
-                LOGGER.warn("Critical: " + criticalWarn);
-            }
-            
     	    if(criticalWarns.isEmpty() || Config.ignoreIncompatibilities) {
     	        renderer = new NeoRenderer(newWorld);
     	        renderer.hasIncompatibilities = !warns.isEmpty() || !criticalWarns.isEmpty();
@@ -159,6 +139,15 @@ public class Neodymium
     	        }
     	    }
     	}
+    	
+    	if(event.phase == TickEvent.Phase.START) {
+    	    if(Compat.hasChanged()) {
+    	        Pair<List<String>, List<String>> warns = checkCompat();
+    	        if(renderer != null) {
+    	            renderer.hasIncompatibilities = !warns.getLeft().isEmpty() || !warns.getRight().isEmpty();
+    	        }
+    	    }
+    	}
     }
     
     @SubscribeEvent
@@ -222,5 +211,34 @@ public class Neodymium
         }
         rendererWorld = null;
     }
+    
+    private static Pair<List<String>, List<String>> checkCompat() {
+        List<String> warns = new ArrayList<>();
+        List<String> criticalWarns = new ArrayList<>();
+        
+        Compat.getCompatibilityWarnings(warns, criticalWarns);
+        
+        if(!criticalWarns.isEmpty()) {
+            criticalWarns.add("Neodymium has been disabled due to a critical incompatibility.");
+        }
+        
+        if(!Config.ignoreIncompatibilities) {
+            for(String warn : warns) {
+                ChatUtil.showNeoChatMessage(warn, ChatUtil.MessageVerbosity.WARNING, true);
+            }
+            for(String fatalWarn : criticalWarns) {
+                ChatUtil.showNeoChatMessage(fatalWarn, ChatUtil.MessageVerbosity.ERROR, true);
+            }
+        }
+        
+        for(String warn : warns) {
+            LOGGER.warn(warn);
+        }
+        for(String criticalWarn : criticalWarns) {
+            LOGGER.warn("Critical: " + criticalWarn);
+        }
+        
+        return Pair.of(warns, criticalWarns);
+    }
 
 }