pixijs shader颗粒化显示贴图

pixijs shader颗粒化显示贴图

   const app = new PIXI.Application({ transparent: true });

        document.body.appendChild(app.view);

        // Create background image

        const background = PIXI.Sprite.from('/moban/bg_grass.jpg');

        background.width = app.screen.width;

        background.height = app.screen.height;

        app.stage.addChild(background);

        // Stop application wait for load to finish

        app.stop();

        app.loader.add('shader', '/moban/shader.frag')

            .load(onLoaded);

        let filter;

        // Handle the load completed

        function onLoaded(loader, res) {

            // Create the new filter, arguments: (vertexShader, framentSource)

            filter = new PIXI.Filter(null, res.shader.data, {

                customUniform: 0.0,

            });

            // === WARNING ===

            // specify uniforms in filter constructor

            // or set them BEFORE first use

            // filter.uniforms.customUniform = 0.0

            // Add the filter

            background.filters = [filter];

            // Resume application update

            app.start();

        }

         var i=;

        // Animate the filter

        app.ticker.add((delta) => {

            i-=0.03;

            filter.uniforms.customUniform = i;

        });

precision mediump float;

varying vec2 vTextureCoord;

varying vec4 vColor;

uniform sampler2D uSampler;

uniform float customUniform;

float r(vec2 p){return fract(cos(mod(.,.*dot(p,vec2(23.140692632779,2.6651441426902)))));}

void main(void)

{

     gl_FragColor=mix(texture2D(uSampler,vTextureCoord),vec4(.,.,.,.),((min(.,.*mod(customUniform,2.5)))<=r(vTextureCoord))?.:.);

}