{"version":3,"file":"AdaptiveToneMappingPass.cjs","sources":["../../src/postprocessing/AdaptiveToneMappingPass.js"],"sourcesContent":["import {\n  LinearMipmapLinearFilter,\n  MeshBasicMaterial,\n  NoBlending,\n  ShaderMaterial,\n  UniformsUtils,\n  WebGLRenderTarget,\n} from 'three'\nimport { Pass, FullScreenQuad } from './Pass'\nimport { CopyShader } from '../shaders/CopyShader'\nimport { LuminosityShader } from '../shaders/LuminosityShader'\nimport { ToneMapShader } from '../shaders/ToneMapShader'\n\n/**\n * Generate a texture that represents the luminosity of the current scene, adapted over time\n * to simulate the optic nerve responding to the amount of light it is receiving.\n * Based on a GDC2007 presentation by Wolfgang Engel titled \"Post-Processing Pipeline\"\n *\n * Full-screen tone-mapping shader based on http://www.graphics.cornell.edu/~jaf/publications/sig02_paper.pdf\n */\n\nclass AdaptiveToneMappingPass extends Pass {\n  constructor(adaptive, resolution) {\n    super()\n\n    this.resolution = resolution !== undefined ? resolution : 256\n    this.needsInit = true\n    this.adaptive = adaptive !== undefined ? !!adaptive : true\n\n    this.luminanceRT = null\n    this.previousLuminanceRT = null\n    this.currentLuminanceRT = null\n\n    const copyShader = CopyShader\n\n    this.copyUniforms = UniformsUtils.clone(copyShader.uniforms)\n\n    this.materialCopy = new ShaderMaterial({\n      uniforms: this.copyUniforms,\n      vertexShader: copyShader.vertexShader,\n      fragmentShader: copyShader.fragmentShader,\n      blending: NoBlending,\n      depthTest: false,\n    })\n\n    this.materialLuminance = new ShaderMaterial({\n      uniforms: UniformsUtils.clone(LuminosityShader.uniforms),\n      vertexShader: LuminosityShader.vertexShader,\n      fragmentShader: LuminosityShader.fragmentShader,\n      blending: NoBlending,\n    })\n\n    this.adaptLuminanceShader = {\n      defines: {\n        MIP_LEVEL_1X1: (Math.log(this.resolution) / Math.log(2.0)).toFixed(1),\n      },\n      uniforms: {\n        lastLum: { value: null },\n        currentLum: { value: null },\n        minLuminance: { value: 0.01 },\n        delta: { value: 0.016 },\n        tau: { value: 1.0 },\n      },\n      vertexShader: `varying vec2 vUv;\n\n\t\t\t\tvoid main() {\n\n\t\t\t\t\tvUv = uv;\n\t\t\t\t\tgl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );\n\n\t\t\t\t}`,\n\n      fragmentShader: `varying vec2 vUv;\n\n\t\t\t\tuniform sampler2D lastLum;\n\t\t\t\tuniform sampler2D currentLum;\n\t\t\t\tuniform float minLuminance;\n\t\t\t\tuniform float delta;\n\t\t\t\tuniform float tau;\n\n\t\t\t\tvoid main() {\n\n\t\t\t\t\tvec4 lastLum = texture2D( lastLum, vUv, MIP_LEVEL_1X1 );\n\t\t\t\t\tvec4 currentLum = texture2D( currentLum, vUv, MIP_LEVEL_1X1 );\n\n\t\t\t\t\tfloat fLastLum = max( minLuminance, lastLum.r );\n\t\t\t\t\tfloat fCurrentLum = max( minLuminance, currentLum.r );\n\n\t\t\t\t\t//The adaption seems to work better in extreme lighting differences\n\t\t\t\t\t//if the input luminance is squared.\n\t\t\t\t\tfCurrentLum *= fCurrentLum;\n\n\t\t\t\t\t// Adapt the luminance using Pattanaik's technique\n\t\t\t\t\tfloat fAdaptedLum = fLastLum + (fCurrentLum - fLastLum) * (1.0 - exp(-delta * tau));\n\t\t\t\t\t// \"fAdaptedLum = sqrt(fAdaptedLum);\n\t\t\t\t\tgl_FragColor.r = fAdaptedLum;\n\t\t\t\t}`,\n    }\n\n    this.materialAdaptiveLum = new ShaderMaterial({\n      uniforms: UniformsUtils.clone(this.adaptLuminanceShader.uniforms),\n      vertexShader: this.adaptLuminanceShader.vertexShader,\n      fragmentShader: this.adaptLuminanceShader.fragmentShader,\n      defines: Object.assign({}, this.adaptLuminanceShader.defines),\n      blending: NoBlending,\n    })\n\n    this.materialToneMap = new ShaderMaterial({\n      uniforms: UniformsUtils.clone(ToneMapShader.uniforms),\n      vertexShader: ToneMapShader.vertexShader,\n      fragmentShader: ToneMapShader.fragmentShader,\n      blending: NoBlending,\n    })\n\n    this.fsQuad = new FullScreenQuad(null)\n  }\n\n  render(renderer, writeBuffer, readBuffer, deltaTime /*, maskActive*/) {\n    if (this.needsInit) {\n      this.reset(renderer)\n\n      this.luminanceRT.texture.type = readBuffer.texture.type\n      this.previousLuminanceRT.texture.type = readBuffer.texture.type\n      this.currentLuminanceRT.texture.type = readBuffer.texture.type\n      this.needsInit = false\n    }\n\n    if (this.adaptive) {\n      //Render the luminance of the current scene into a render target with mipmapping enabled\n      this.fsQuad.material = this.materialLuminance\n      this.materialLuminance.uniforms.tDiffuse.value = readBuffer.texture\n      renderer.setRenderTarget(this.currentLuminanceRT)\n      this.fsQuad.render(renderer)\n\n      //Use the new luminance values, the previous luminance and the frame delta to\n      //adapt the luminance over time.\n      this.fsQuad.material = this.materialAdaptiveLum\n      this.materialAdaptiveLum.uniforms.delta.value = deltaTime\n      this.materialAdaptiveLum.uniforms.lastLum.value = this.previousLuminanceRT.texture\n      this.materialAdaptiveLum.uniforms.currentLum.value = this.currentLuminanceRT.texture\n      renderer.setRenderTarget(this.luminanceRT)\n      this.fsQuad.render(renderer)\n\n      //Copy the new adapted luminance value so that it can be used by the next frame.\n      this.fsQuad.material = this.materialCopy\n      this.copyUniforms.tDiffuse.value = this.luminanceRT.texture\n      renderer.setRenderTarget(this.previousLuminanceRT)\n      this.fsQuad.render(renderer)\n    }\n\n    this.fsQuad.material = this.materialToneMap\n    this.materialToneMap.uniforms.tDiffuse.value = readBuffer.texture\n\n    if (this.renderToScreen) {\n      renderer.setRenderTarget(null)\n      this.fsQuad.render(renderer)\n    } else {\n      renderer.setRenderTarget(writeBuffer)\n\n      if (this.clear) renderer.clear()\n\n      this.fsQuad.render(renderer)\n    }\n  }\n\n  reset() {\n    // render targets\n    if (this.luminanceRT) {\n      this.luminanceRT.dispose()\n    }\n\n    if (this.currentLuminanceRT) {\n      this.currentLuminanceRT.dispose()\n    }\n\n    if (this.previousLuminanceRT) {\n      this.previousLuminanceRT.dispose()\n    }\n\n    this.luminanceRT = new WebGLRenderTarget(this.resolution, this.resolution)\n    this.luminanceRT.texture.name = 'AdaptiveToneMappingPass.l'\n    this.luminanceRT.texture.generateMipmaps = false\n\n    this.previousLuminanceRT = new WebGLRenderTarget(this.resolution, this.resolution)\n    this.previousLuminanceRT.texture.name = 'AdaptiveToneMappingPass.pl'\n    this.previousLuminanceRT.texture.generateMipmaps = false\n\n    // We only need mipmapping for the current luminosity because we want a down-sampled version to sample in our adaptive shader\n\n    const pars = { minFilter: LinearMipmapLinearFilter, generateMipmaps: true }\n\n    this.currentLuminanceRT = new WebGLRenderTarget(this.resolution, this.resolution, pars)\n    this.currentLuminanceRT.texture.name = 'AdaptiveToneMappingPass.cl'\n\n    if (this.adaptive) {\n      this.materialToneMap.defines['ADAPTED_LUMINANCE'] = ''\n      this.materialToneMap.uniforms.luminanceMap.value = this.luminanceRT.texture\n    }\n\n    //Put something in the adaptive luminance texture so that the scene can render initially\n    this.fsQuad.material = new MeshBasicMaterial({ color: 0x777777 })\n    this.materialLuminance.needsUpdate = true\n    this.materialAdaptiveLum.needsUpdate = true\n    this.materialToneMap.needsUpdate = true\n    // renderer.render( this.scene, this.camera, this.luminanceRT );\n    // renderer.render( this.scene, this.camera, this.previousLuminanceRT );\n    // renderer.render( this.scene, this.camera, this.currentLuminanceRT );\n  }\n\n  setAdaptive(adaptive) {\n    if (adaptive) {\n      this.adaptive = true\n      this.materialToneMap.defines['ADAPTED_LUMINANCE'] = ''\n      this.materialToneMap.uniforms.luminanceMap.value = this.luminanceRT.texture\n    } else {\n      this.adaptive = false\n      delete this.materialToneMap.defines['ADAPTED_LUMINANCE']\n      this.materialToneMap.uniforms.luminanceMap.value = null\n    }\n\n    this.materialToneMap.needsUpdate = true\n  }\n\n  setAdaptionRate(rate) {\n    if (rate) {\n      this.materialAdaptiveLum.uniforms.tau.value = Math.abs(rate)\n    }\n  }\n\n  setMinLuminance(minLum) {\n    if (minLum) {\n      this.materialToneMap.uniforms.minLuminance.value = minLum\n      this.materialAdaptiveLum.uniforms.minLuminance.value = minLum\n    }\n  }\n\n  setMaxLuminance(maxLum) {\n    if (maxLum) {\n      this.materialToneMap.uniforms.maxLuminance.value = maxLum\n    }\n  }\n\n  setAverageLuminance(avgLum) {\n    if (avgLum) {\n      this.materialToneMap.uniforms.averageLuminance.value = avgLum\n    }\n  }\n\n  setMiddleGrey(middleGrey) {\n    if (middleGrey) {\n      this.materialToneMap.uniforms.middleGrey.value = middleGrey\n    }\n  }\n\n  dispose() {\n    if (this.luminanceRT) {\n      this.luminanceRT.dispose()\n    }\n\n    if (this.previousLuminanceRT) {\n      this.previousLuminanceRT.dispose()\n    }\n\n    if (this.currentLuminanceRT) {\n      this.currentLuminanceRT.dispose()\n    }\n\n    if (this.materialLuminance) {\n      this.materialLuminance.dispose()\n    }\n\n    if (this.materialAdaptiveLum) {\n      this.materialAdaptiveLum.dispose()\n    }\n\n    if (this.materialCopy) {\n      this.materialCopy.dispose()\n    }\n\n    if (this.materialToneMap) {\n      this.materialToneMap.dispose()\n    }\n  }\n}\n\nexport { AdaptiveToneMappingPass 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