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public/sdk/three/jsm/shaders/ACESFilmicToneMappingShader.js

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+/**
+ * ACES Filmic Tone Mapping Shader by Stephen Hill
+ * source: https://github.com/selfshadow/ltc_code/blob/master/webgl/shaders/ltc/ltc_blit.fs
+ *
+ * this implementation of ACES is modified to accommodate a brighter viewing environment.
+ * the scale factor of 1/0.6 is subjective. see discussion in #19621.
+ */
+
+const ACESFilmicToneMappingShader = {
+
+	name: 'ACESFilmicToneMappingShader',
+
+	uniforms: {
+
+		'tDiffuse': { value: null },
+		'exposure': { value: 1.0 }
+
+	},
+
+	vertexShader: /* glsl */`
+
+		varying vec2 vUv;
+
+		void main() {
+
+			vUv = uv;
+			gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );
+
+		}`,
+
+	fragmentShader: /* glsl */`
+
+		#define saturate(a) clamp( a, 0.0, 1.0 )
+
+		uniform sampler2D tDiffuse;
+
+		uniform float exposure;
+
+		varying vec2 vUv;
+
+		vec3 RRTAndODTFit( vec3 v ) {
+
+			vec3 a = v * ( v + 0.0245786 ) - 0.000090537;
+			vec3 b = v * ( 0.983729 * v + 0.4329510 ) + 0.238081;
+			return a / b;
+
+		}
+
+		vec3 ACESFilmicToneMapping( vec3 color ) {
+
+		// sRGB => XYZ => D65_2_D60 => AP1 => RRT_SAT
+			const mat3 ACESInputMat = mat3(
+				vec3( 0.59719, 0.07600, 0.02840 ), // transposed from source
+				vec3( 0.35458, 0.90834, 0.13383 ),
+				vec3( 0.04823, 0.01566, 0.83777 )
+			);
+
+		// ODT_SAT => XYZ => D60_2_D65 => sRGB
+			const mat3 ACESOutputMat = mat3(
+				vec3(  1.60475, -0.10208, -0.00327 ), // transposed from source
+				vec3( -0.53108,  1.10813, -0.07276 ),
+				vec3( -0.07367, -0.00605,  1.07602 )
+			);
+
+			color = ACESInputMat * color;
+
+		// Apply RRT and ODT
+			color = RRTAndODTFit( color );
+
+			color = ACESOutputMat * color;
+
+		// Clamp to [0, 1]
+			return saturate( color );
+
+		}
+
+		void main() {
+
+			vec4 tex = texture2D( tDiffuse, vUv );
+
+			tex.rgb *= exposure / 0.6; // pre-exposed, outside of the tone mapping function
+
+			gl_FragColor = vec4( ACESFilmicToneMapping( tex.rgb ), tex.a );
+
+		}`
+
+};
+
+export { ACESFilmicToneMappingShader };