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

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+/**
+ * Full-screen tone-mapping shader based on http://www.cis.rit.edu/people/faculty/ferwerda/publications/sig02_paper.pdf
+ */
+
+const ToneMapShader = {
+
+	uniforms: {
+
+		'tDiffuse': { value: null },
+		'averageLuminance': { value: 1.0 },
+		'luminanceMap': { value: null },
+		'maxLuminance': { value: 16.0 },
+		'minLuminance': { value: 0.01 },
+		'middleGrey': { value: 0.6 }
+	},
+
+	vertexShader: /* glsl */`
+
+		varying vec2 vUv;
+
+		void main() {
+
+			vUv = uv;
+			gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );
+
+		}`,
+
+	fragmentShader: /* glsl */`
+
+		#include <common>
+
+		uniform sampler2D tDiffuse;
+
+		varying vec2 vUv;
+
+		uniform float middleGrey;
+		uniform float minLuminance;
+		uniform float maxLuminance;
+		#ifdef ADAPTED_LUMINANCE
+			uniform sampler2D luminanceMap;
+		#else
+			uniform float averageLuminance;
+		#endif
+
+		vec3 ToneMap( vec3 vColor ) {
+			#ifdef ADAPTED_LUMINANCE
+				// Get the calculated average luminance
+				float fLumAvg = texture2D(luminanceMap, vec2(0.5, 0.5)).r;
+			#else
+				float fLumAvg = averageLuminance;
+			#endif
+
+			// Calculate the luminance of the current pixel
+			float fLumPixel = linearToRelativeLuminance( vColor );
+
+			// Apply the modified operator (Eq. 4)
+			float fLumScaled = (fLumPixel * middleGrey) / max( minLuminance, fLumAvg );
+
+			float fLumCompressed = (fLumScaled * (1.0 + (fLumScaled / (maxLuminance * maxLuminance)))) / (1.0 + fLumScaled);
+			return fLumCompressed * vColor;
+		}
+
+		void main() {
+
+			vec4 texel = texture2D( tDiffuse, vUv );
+
+			gl_FragColor = vec4( ToneMap( texel.xyz ), texel.w );
+
+		}`
+
+};
+
+export { ToneMapShader };