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source/shaders/MosaicEffect.hx

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+package shaders;
+
+import shaders.MosaicShader;
+
+class MosaicEffect
+{
+	/**
+	 * The effect's "start-value" on the x/y-axes (the effect is not visible with this value).
+	 */
+	public static inline var DEFAULT_STRENGTH:Float = 1;
+
+	/**
+	 * The instance of the actual shader class
+	 */
+	public var shader(default, null):MosaicShader;
+
+	/**
+	 * The effect's strength on the x-axis.
+	 */
+	public var strengthX(default, null):Float = DEFAULT_STRENGTH;
+
+	/**
+	 * The effect's strength on the y-axis.
+	 */
+	public var strengthY(default, null):Float = DEFAULT_STRENGTH;
+
+	public function new():Void
+	{
+		shader = new MosaicShader();
+		shader.data.uBlocksize.value = [strengthX, strengthY];
+	}
+
+	public function setStrength(strengthX:Float, strengthY:Float):Void
+	{
+		this.strengthX = strengthX;
+		this.strengthY = strengthY;
+		shader.uBlocksize.value[0] = strengthX;
+		shader.uBlocksize.value[1] = strengthY;
+	}
+}

source/shaders/MosaicShader.hx

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+package shaders;
+
+import flixel.system.FlxAssets.FlxShader;
+
+/**
+ * A classic mosaic effect, just like in the old days!
+ *
+ * Usage notes:
+ * - The effect will be applied to the whole screen.
+ * - Set the x/y-values on the 'uBlocksize' vector to the desired size (setting this to 0 will make the screen go black)
+ */
+class MosaicShader extends FlxShader
+{
+	@:glFragmentSource('
+		#pragma header
+		uniform vec2 uBlocksize;
+
+		void main()
+		{
+			vec2 blocks = openfl_TextureSize / uBlocksize;
+			gl_FragColor = flixel_texture2D(bitmap, floor(openfl_TextureCoordv * blocks) / blocks);
+		}')
+	public function new() super();
+}