three.js/examples/jsm/shaders/OutputShader.js

const OutputShader = {

	uniforms: {

		'tDiffuse': { value: null },
		'toneMappingExposure': { value: 1 }

	},

	vertexShader: /* glsl */`

		varying vec2 vUv;

		void main() {

			vUv = uv;
			gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );

		}`,

	fragmentShader: /* glsl */`

		uniform sampler2D tDiffuse;

		#include <tonemapping_pars_fragment>

		varying vec2 vUv;

		void main() {

			gl_FragColor = texture2D( tDiffuse, vUv );

			// tone mapping

			#ifdef LINEAR_TONE_MAPPING

				gl_FragColor.rgb = LinearToneMapping( gl_FragColor.rgb );

			#elif defined( REINHARD_TONE_MAPPING )

				gl_FragColor.rgb = ReinhardToneMapping( gl_FragColor.rgb );

			#elif defined( CINEON_TONE_MAPPING )

				gl_FragColor.rgb = OptimizedCineonToneMapping( gl_FragColor.rgb );

			#elif defined( ACES_FILMIC_TONE_MAPPING )

				gl_FragColor.rgb = ACESFilmicToneMapping( gl_FragColor.rgb );

			#endif

			// color space

			gl_FragColor = LinearTosRGB( gl_FragColor );

		}`

};

export { OutputShader };