Make it possible to properly disable blur

common/src/main/java/org/embeddedt/modernfix/common/mixin/perf/disable_blur_if_off/GameRendererMixin.java

@@ -0,0 +1,28 @@
+package org.embeddedt.modernfix.common.mixin.perf.disable_blur_if_off;
+
+import net.minecraft.client.Minecraft;
+import net.minecraft.client.renderer.GameRenderer;
+import org.embeddedt.modernfix.annotation.ClientOnlyMixin;
+import org.spongepowered.asm.mixin.Final;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Shadow;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
+
+@Mixin(GameRenderer.class)
+@ClientOnlyMixin
+public class GameRendererMixin {
+    @Shadow @Final private Minecraft minecraft;
+
+    /**
+     * @author embeddedt
+     * @reason Do not run the blur shader if blur is completely disabled.
+     */
+    @Inject(method = "processBlurEffect", at = @At("HEAD"), cancellable = true)
+    private void skipBlurIfDisabled(float f, CallbackInfo ci) {
+        if(this.minecraft.options.getMenuBackgroundBlurriness() <= 0) {
+            ci.cancel();
+        }
+    }
+}