animate/webGl/my-threejs-test/node_modules/three/examples/jsm/shaders/DotScreenShader.js

71 lines
1.2 KiB
JavaScript

import {
Vector2
} from 'three';
/**
* Dot screen shader
* based on glfx.js sepia shader
* https://github.com/evanw/glfx.js
*/
const DotScreenShader = {
name: 'DotScreenShader',
uniforms: {
'tDiffuse': { value: null },
'tSize': { value: new Vector2( 256, 256 ) },
'center': { value: new Vector2( 0.5, 0.5 ) },
'angle': { value: 1.57 },
'scale': { value: 1.0 }
},
vertexShader: /* glsl */`
varying vec2 vUv;
void main() {
vUv = uv;
gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );
}`,
fragmentShader: /* glsl */`
uniform vec2 center;
uniform float angle;
uniform float scale;
uniform vec2 tSize;
uniform sampler2D tDiffuse;
varying vec2 vUv;
float pattern() {
float s = sin( angle ), c = cos( angle );
vec2 tex = vUv * tSize - center;
vec2 point = vec2( c * tex.x - s * tex.y, s * tex.x + c * tex.y ) * scale;
return ( sin( point.x ) * sin( point.y ) ) * 4.0;
}
void main() {
vec4 color = texture2D( tDiffuse, vUv );
float average = ( color.r + color.g + color.b ) / 3.0;
gl_FragColor = vec4( vec3( average * 10.0 - 5.0 + pattern() ), color.a );
}`
};
export { DotScreenShader };