Pixi.Mesh gl_FragColor Alpha Channel

[cafelatte]

Hi,

 

I've tried to change the Alpha Channel on gl_FragColor on a Mesh, but it doesn't show a result as I expect.

For example, on the pixijs.io example ( https://pixijs.io/examples/#/mesh/triangle-color.js )

void main() {
        gl_FragColor = vec4(vColor, 1.0);
    }

If we changed the line into

void main() {
        gl_FragColor = vec4(vColor, 0.5);
    }

 

It doesn't show any difference. Is there any workaround/settings I need to adjust to use the alpha channel correctly?

 

 

Thanks.

 

[ivan.popelyshev]

void main() {
        gl_FragColor = vec4(vColor, 1.0) * 0.5;
    }

We use premultiplied alpha everywhere. Instead of (r,g,b,a) we store (r*a, g*a, b*a, a)

[ivan.popelyshev]

Very good question, congratulations with first post!

[cafelatte]

Thanks for the welcoming & prompt response Ivan.

Been reading lots of your comments regarding Pixi and it helps a lot.