pokerogue/src/pipelines/invert.ts

import { Game } from "phaser";

const fragShader = `
precision mediump float;

uniform sampler2D uMainSampler;

varying vec2 outTexCoord;

void main()
{
    gl_FragColor = 1.0 - texture2D(uMainSampler, outTexCoord);
}
`;

export default class InvertPostFX extends Phaser.Renderer.WebGL.Pipelines.PostFXPipeline {
    constructor (game: Game) {
        super({
            game,
            name: 'InvertPostFX',
            fragShader,
            uniforms: [
                'uMainSampler'
            ]
        } as Phaser.Types.Renderer.WebGL.WebGLPipelineConfig);
    }
}