simsite/frontend/node_modules/three-stdlib/shaders/AfterimageShader.js

const AfterimageShader = {
  uniforms: {
    damp: { value: 0.96 },
    tOld: { value: null },
    tNew: { value: null }
  },
  vertexShader: (
    /* glsl */
    `
    varying vec2 vUv;

    void main() {

    	vUv = uv;
    	gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );

    }
  `
  ),
  fragmentShader: (
    /* glsl */
    `
    uniform float damp;

    uniform sampler2D tOld;
    uniform sampler2D tNew;

    varying vec2 vUv;

    vec4 when_gt( vec4 x, float y ) {

    	return max( sign( x - y ), 0.0 );

    }

    void main() {

    	vec4 texelOld = texture2D( tOld, vUv );
    	vec4 texelNew = texture2D( tNew, vUv );

    	texelOld *= damp * when_gt( texelOld, 0.1 );

    	gl_FragColor = max(texelNew, texelOld);

    }
  `
  )
};
export {
  AfterimageShader
};
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