Add support for FREX Flawless Frames API (fixes #150)

src/main/java/com/replaymod/render/utils/FlawlessFrames.java

@@ -0,0 +1,40 @@
+package com.replaymod.render.utils;
+
+import java.util.List;
+import java.util.concurrent.CopyOnWriteArrayList;
+import java.util.function.Consumer;
+import java.util.function.Function;
+
+import static com.replaymod.core.ReplayMod.MOD_ID;
+
+/**
+ * Uses the "Flawless Frames" FREX feature which allows us to instruct third-party mods to sacrifice performance (even
+ * beyond the point where it can no longer achieve interactive frame rates) in exchange for a noticeable boost to
+ * quality.
+ * In particular also to force-load all chunks with Canvas/Sodium/Bobby.
+ *
+ * See https://github.com/grondag/frex/pull/9
+ */
+public class FlawlessFrames {
+    private static final List<Consumer<Boolean>> CONSUMERS = new CopyOnWriteArrayList<>();
+    private static boolean hasSodium;
+
+    private FlawlessFrames() {}
+
+    public static void registerConsumer(Function<String, Consumer<Boolean>> provider) {
+        Consumer<Boolean> consumer = provider.apply(MOD_ID);
+        CONSUMERS.add(consumer);
+
+        if (provider.getClass().getName().contains(".sodium.") || consumer.getClass().getName().contains(".sodium.")) {
+            hasSodium = true;
+        }
+    }
+
+    public static void setEnabled(boolean enabled) {
+        CONSUMERS.forEach(it -> it.accept(enabled));
+    }
+
+    public static boolean hasSodium() {
+        return hasSodium;
+    }
+}