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HTML/ThreeJS/node_modules/three/examples/jsm/shaders/FilmShader.js

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+/**
+ * Film grain & scanlines shader
+ *
+ * - ported from HLSL to WebGL / GLSL
+ * https://web.archive.org/web/20210226214859/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/
+ */
+
+const FilmShader = {
+
+	uniforms: {
+
+		'tDiffuse': { value: null },
+		'time': { value: 0.0 },
+		'nIntensity': { value: 0.5 },
+		'sIntensity': { value: 0.05 },
+		'sCount': { value: 4096 },
+		'grayscale': { value: 1 }
+
+	},
+
+	vertexShader: /* glsl */`
+
+		varying vec2 vUv;
+
+		void main() {
+
+			vUv = uv;
+			gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );
+
+		}`,
+
+	fragmentShader: /* glsl */`
+
+		#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 );
+
+		}`,
+
+};
+
+export { FilmShader };