https://github.com/WWBN/AVideo/issues/8713

node_modules/three/examples/js/shaders/DotScreenShader.js

@@ -0,0 +1,66 @@
+/**
+ * Dot screen shader
+ * based on glfx.js sepia shader
+ * https://github.com/evanw/glfx.js
+ */
+
+THREE.DotScreenShader = {
+
+	uniforms: {
+
+		'tDiffuse': { value: null },
+		'tSize': { value: new THREE.Vector2( 256, 256 ) },
+		'center': { value: new THREE.Vector2( 0.5, 0.5 ) },
+		'angle': { value: 1.57 },
+		'scale': { value: 1.0 }
+
+	},
+
+	vertexShader: [
+
+		'varying vec2 vUv;',
+
+		'void main() {',
+
+		'	vUv = uv;',
+		'	gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );',
+
+		'}'
+
+	].join( '\n' ),
+
+	fragmentShader: [
+
+		'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 );',
+
+		'}'
+
+	].join( '\n' )
+
+};