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

node_modules/three/examples/js/shaders/FilmShader.js

@@ -0,0 +1,102 @@
+/**
+ * Film grain & scanlines shader
+ *
+ * - ported from HLSL to WebGL / GLSL
+ * http://www.truevision3d.com/forums/showcase/staticnoise_colorblackwhite_scanline_shaders-t18698.0.html
+ *
+ * Screen Space Static Postprocessor
+ *
+ * Produces an analogue noise overlay similar to a film grain / TV static
+ *
+ * Original implementation and noise algorithm
+ * Pat 'Hawthorne' Shearon
+ *
+ * Optimized scanlines + noise version with intensity scaling
+ * Georg 'Leviathan' Steinrohder
+ *
+ * This version is provided under a Creative Commons Attribution 3.0 License
+ * http://creativecommons.org/licenses/by/3.0/
+ */
+
+THREE.FilmShader = {
+
+	uniforms: {
+
+		'tDiffuse': { value: null },
+		'time': { value: 0.0 },
+		'nIntensity': { value: 0.5 },
+		'sIntensity': { value: 0.05 },
+		'sCount': { value: 4096 },
+		'grayscale': { value: 1 }
+
+	},
+
+	vertexShader: [
+
+		'varying vec2 vUv;',
+
+		'void main() {',
+
+		'	vUv = uv;',
+		'	gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );',
+
+		'}'
+
+	].join( '\n' ),
+
+	fragmentShader: [
+
+		'#include <common>',
+
+		// control parameter
+		'uniform float time;',
+
+		'uniform bool grayscale;',
+
+		// noise effect intensity value (0 = no effect, 1 = full effect)
+		'uniform float nIntensity;',
+
+		// scanlines effect intensity value (0 = no effect, 1 = full effect)
+		'uniform float sIntensity;',
+
+		// scanlines effect count value (0 = no effect, 4096 = full effect)
+		'uniform float sCount;',
+
+		'uniform sampler2D tDiffuse;',
+
+		'varying vec2 vUv;',
+
+		'void main() {',
+
+		// sample the source
+		'	vec4 cTextureScreen = texture2D( tDiffuse, vUv );',
+
+		// make some noise
+		'	float dx = rand( vUv + time );',
+
+		// add noise
+		'	vec3 cResult = cTextureScreen.rgb + cTextureScreen.rgb * clamp( 0.1 + dx, 0.0, 1.0 );',
+
+		// get us a sine and cosine
+		'	vec2 sc = vec2( sin( vUv.y * sCount ), cos( vUv.y * sCount ) );',
+
+		// add scanlines
+		'	cResult += cTextureScreen.rgb * vec3( sc.x, sc.y, sc.x ) * sIntensity;',
+
+		// interpolate between source and result by intensity
+		'	cResult = cTextureScreen.rgb + clamp( nIntensity, 0.0,1.0 ) * ( cResult - cTextureScreen.rgb );',
+
+		// convert to grayscale if desired
+		'	if( grayscale ) {',
+
+		'		cResult = vec3( cResult.r * 0.3 + cResult.g * 0.59 + cResult.b * 0.11 );',
+
+		'	}',
+
+		'	gl_FragColor =  vec4( cResult, cTextureScreen.a );',
+
+		'}'
+
+	].join( '\n' )
+
+};