Blending in v9

[aslmbk]

Hi all! I wanted to set up AdditiveBlending on ArcLayer.

In the previous version everything worked great, but after I updated to the latest version, blending stopped working

Here is the code

    new ArcLayer<ArcLike>({
      id: 'arcs-layer',
      data,
      getSourcePosition: (a) => a.start,
      getTargetPosition: (a) => a.end,
      getSourceColor: (a) => getColor(a.type),
      getTargetColor: (a) => getColor(a.type),
      getWidth: 1,
      parameters: {
        depthWriteEnabled: false,
        blendColorSrcFactor: 'src-alpha',
        blendAlphaSrcFactor: 'src-alpha',
        blendColorDstFactor: 'one',
        blendAlphaDstFactor: 'one',
        blendColorOperation: 'add',
        blendAlphaOperation: 'add',
        // depthTest: false,
        // blendFunc: [GL.SRC_ALPHA, GL.ONE],
        // blendEquation: GL.FUNC_ADD,
      },
    }),

[ibgreen]

There is a known issue in luma v9 with blending not being enabled in WebGL by the blending props. Maybe you can do it manually device.gl.enable(device.gl.BLEND) if you can find the right place to inject it. Maybe layer.props.onBeforeRender or something like that?

[Pessimistress]

Seems working for me: https://codepen.io/Pessimistress/pen/XWLmRxZ?editors=0010