three 基础库
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( function () {
/**
* RGB Shift Shader
* Shifts red and blue channels from center in opposite directions
* Ported from http://kriss.cx/tom/2009/05/rgb-shift/
* by Tom Butterworth / http://kriss.cx/tom/
*
* amount: shift distance (1 is width of input)
* angle: shift angle in radians
*/
const RGBShiftShader = {
uniforms: {
'tDiffuse': {
value: null
},
'amount': {
value: 0.005
},
'angle': {
value: 0.0
}
},
vertexShader:
/* glsl */
`
varying vec2 vUv;
void main() {
vUv = uv;
gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );
}`,
fragmentShader:
/* glsl */
`
uniform sampler2D tDiffuse;
uniform float amount;
uniform float angle;
varying vec2 vUv;
void main() {
vec2 offset = amount * vec2( cos(angle), sin(angle));
vec4 cr = texture2D(tDiffuse, vUv + offset);
vec4 cga = texture2D(tDiffuse, vUv);
vec4 cb = texture2D(tDiffuse, vUv - offset);
gl_FragColor = vec4(cr.r, cga.g, cb.b, cga.a);
}`
};
THREE.RGBShiftShader = RGBShiftShader;
} )();