Improve Iris compatibility

- Use config-based areShadersEnabled when choosing the engine

src/main/java/com/jozufozu/flywheel/backend/Backend.java

@@ -77,7 +77,7 @@ public class Backend {
 		FlwEngine preferredChoice = FlwConfig.get()
 				.getEngine();
 
-		boolean usingShaders = IrisShaderHandler.isShaderPackInUse();
+		boolean usingShaders = IrisShaderHandler.areShadersEnabled();
 		boolean canUseEngine = switch (preferredChoice) {
 			case OFF -> true;
 			case BATCHING -> !usingShaders;

src/main/java/com/jozufozu/flywheel/backend/IrisShaderHandler.java

@@ -19,6 +19,10 @@ public class IrisShaderHandler {
 	private IrisShaderHandler() {
 	}
 
+	public static boolean areShadersEnabled() {
+		return HANDLER.areShadersEnabled();
+	}
+
 	public static boolean isShaderPackInUse() {
 		return HANDLER.isShaderPackInUse();
 	}
@@ -28,6 +32,10 @@ public class IrisShaderHandler {
 	}
 
 	private interface InternalHandler {
+		default boolean areShadersEnabled() {
+			return false;
+		};
+
 		default boolean isShaderPackInUse() {
 			return false;
 		};
@@ -38,6 +46,11 @@ public class IrisShaderHandler {
 	}
 
 	private static class InternalHandlerImpl implements InternalHandler {
+		@Override
+		public boolean areShadersEnabled() {
+			return IrisApi.getInstance().getConfig().areShadersEnabled();
+		};
+
 		@Override
 		public boolean isShaderPackInUse() {
 			return IrisApi.getInstance().isShaderPackInUse();

src/main/java/com/jozufozu/flywheel/fabric/event/EventContext.java

@@ -21,4 +21,4 @@ public class EventContext {
 	public interface Listener<C extends EventContext> {
 		void handleEvent(C context);
 	}
-}
+}

src/main/java/com/jozufozu/flywheel/fabric/event/FlywheelEvents.java

@@ -24,4 +24,4 @@ public final class FlywheelEvents {
 			}
 		);
 	}
-}
+}