Extend custom class

[HEIHUAa]

Make BitmapFilter overridable by scripts (already verified to work)

Previously, I thought writing extends BitmapFilter in a script was invalid, but after extensive testing, it turned out to be a viable approach.

Below is a code example of BitmapFilter:

BloomFilter.hx

import funkin.backend.shaders.FunkinShader;
import openfl.filters.BitmapFilter;
import openfl.display.BitmapData;
import openfl.display.DisplayObjectRenderer;
import openfl.display.Shader;
import openfl.geom.Point;
import openfl.geom.Rectangle;

class BloomFilter extends BitmapFilter {
	static var blurShader_reduce:FunkinShader = new FunkinShader("...");

	static var blurShader_amplification:FunkinShader = new FunkinShader("...");

	static var blurShader_null:FunkinShader = new FunkinShader("...");

	var textureScale:Float = 0;

	public function new(?scale:Float) {
		super();

		scale ??= 0;
		textureScale = scale;

		__needSecondBitmapData = true;
		__preserveObject = false;
		__numShaderPasses = 2;
		__renderDirty = true;

		if (scale > 0) {
			blurShader_reduce.textureScale = scale;
			blurShader_amplification.textureScale = scale;
		}
	}

	public override function clone():BitmapFilter {
		// var newFilter = new BloomFilter(textureScale);
		return this.superClass;
	}

	override function __applyFilter(bitmapData:BitmapData, sourceBitmapData:BitmapData, sourceRect:Rectangle, destPoint:Point):BitmapData {
		return sourceBitmapData;
	}

	override function __initShader(renderer:DisplayObjectRenderer, pass:Int, sourceBitmapData:BitmapData):Shader {
		if (textureScale <= 0) return blurShader_null;
		
		if (pass == 0) {
			return blurShader_reduce;
		} else {
			return blurShader_amplification;
		}
	}
}

1.hx

import BloomFilter;

function postCreate() {
	var bloom = new BloomFilter(100);
	var realFilter = bloom.superClass;
	FlxG.camera.setFilters([realFilter]);
}

[ItsLJcool]

seems hacky imo
Why not just use the ScriptableShader instead of stalling the rendering pipeline with HScript

[HEIHUAa]

seems hacky imo Why not just use the ScriptableShader instead of stalling the rendering pipeline with HScript

If ScriptableShader doesn’t have a way to call the sourceBitmapData function, I wouldn’t have used BitmapFilter at all.

[HEIHUAa]

seems hacky imo Why not just use the ScriptableShader instead of stalling the rendering pipeline with HScript

Or do you know how to read sourceBitmapData using ScriptableShader?