Alternative to BlendMode.ERASE on windows platform?

Knight52 · June 16, 2019, 5:07pm

I’m trying to do an inverse mask on windows platform. I set parent object to BlendMode.LAYER, and set the mask to BlendMode.ERASE, but it doesn’t seem to work. So I guess it’s not working, as document stated.

So, anyone ever found an alternative for inverse mask for GPU rendering?

singmajesty · June 24, 2019, 5:08pm

It is not very difficult (in theory) to do this with GPU rendering:

github.com

openfl/starling/blob/79c8e6a23d46b5f681c17b627a81207a6ff083a9/src/starling/rendering/Painter.hx

// =================================================================================================
//
//	Starling Framework
//	Copyright Gamua GmbH. All Rights Reserved.
//
//	This program is free software. You can redistribute and/or modify it
//	in accordance with the terms of the accompanying license agreement.
//
// =================================================================================================

package starling.rendering;

import openfl.display.Stage3D;
import openfl.display3D.Context3D;
import openfl.display3D.Context3DCompareMode;
import openfl.display3D.Context3DStencilAction;
import openfl.display3D.Context3DTriangleFace;
import openfl.display3D.textures.TextureBase;
import openfl.errors.Error;
import openfl.errors.IllegalOperationError;

This file has been truncated. show original

(look for maskInverted here)

Support for BlendMode.LAYER + BlendMode.ERASE is not supported yet in the OpenFL renderer… but it could be! Happy to discuss if someone wants to help implement this?