Work around Flywheel leaving freed buffers in BufferBuilder

Author: embeddedt

common/src/main/java/org/embeddedt/modernfix/common/mixin/bugfix/buffer_builder_leak/BufferBuilderMixin.java

@@ -4,6 +4,7 @@
 import org.embeddedt.modernfix.ModernFix;
 import org.embeddedt.modernfix.annotation.ClientOnlyMixin;
 import org.embeddedt.modernfix.render.UnsafeBufferHelper;
+import org.spongepowered.asm.mixin.Dynamic;
 import org.spongepowered.asm.mixin.Mixin;
 import org.spongepowered.asm.mixin.Shadow;
 import org.spongepowered.asm.mixin.injection.At;
@@ -12,13 +13,21 @@
 
 import java.nio.ByteBuffer;
 
-@Mixin(BufferBuilder.class)
+@Mixin(value = BufferBuilder.class, priority = 1500)
 @ClientOnlyMixin
 public class BufferBuilderMixin {
     @Shadow private ByteBuffer buffer;
 
     private static boolean leakReported = false;
 
+    private boolean mfix$shouldFree = true;
+
+    @Dynamic
+    @Inject(method = "flywheel$injectForRender", at = @At("RETURN"), remap = false, require = 0)
+    private void preventFree(CallbackInfo ci) {
+        mfix$shouldFree = false;
+    }
+
     /**
      * Ensure UnsafeBufferHelper is classloaded early, to avoid Forge's event transformer showing an error in the log.
      */
@@ -32,7 +41,7 @@ protected void finalize() throws Throwable {
         try {
             ByteBuffer buf = buffer;
             // can be null if a mod already tried to free the buffer
-            if(buf != null) {
+            if(buf != null && mfix$shouldFree) {
                 if(!leakReported) {
                     leakReported = true;
                     ModernFix.LOGGER.warn("One or more BufferBuilders have been leaked, ModernFix will attempt to correct this.");