three 基础库
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2 years ago
( function () {
/**
* Afterimage shader
* I created this effect inspired by a demo on codepen:
* https://codepen.io/brunoimbrizi/pen/MoRJaN?page=1&
*/
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);
}`
};
THREE.AfterimageShader = AfterimageShader;
} )();