thing_web/public/cdn/three/UnrealBloomPass.js

(function () {
  /**
   * UnrealBloomPass is inspired by the bloom pass of Unreal Engine. It creates a
   * mip map chain of bloom textures and blurs them with different radii. Because
   * of the weighted combination of mips, and because larger blurs are done on
   * higher mips, this effect provides good quality and performance.
   *
   * Reference:
   * - https://docs.unrealengine.com/latest/INT/Engine/Rendering/PostProcessEffects/Bloom/
   */

  class UnrealBloomPass extends THREE.Pass {
    constructor(resolution, strength, radius, threshold) {
      super();
      this.strength = strength !== undefined ? strength : 1;
      this.radius = radius;
      this.threshold = threshold;
      this.resolution =
        resolution !== undefined
          ? new THREE.Vector2(resolution.x, resolution.y)
          : new THREE.Vector2(256, 256); // create color only once here, reuse it later inside the render function

      this.clearColor = new THREE.Color(0, 0, 0); // render targets

      this.renderTargetsHorizontal = [];
      this.renderTargetsVertical = [];
      this.nMips = 5;
      let resx = Math.round(this.resolution.x / 2);
      let resy = Math.round(this.resolution.y / 2);
      this.renderTargetBright = new THREE.WebGLRenderTarget(resx, resy);
      this.renderTargetBright.texture.name = "UnrealBloomPass.bright";
      this.renderTargetBright.texture.generateMipmaps = false;

      for (let i = 0; i < this.nMips; i++) {
        const renderTargetHorizonal = new THREE.WebGLRenderTarget(resx, resy);
        renderTargetHorizonal.texture.name = "UnrealBloomPass.h" + i;
        renderTargetHorizonal.texture.generateMipmaps = false;
        this.renderTargetsHorizontal.push(renderTargetHorizonal);
        const renderTargetVertical = new THREE.WebGLRenderTarget(resx, resy);
        renderTargetVertical.texture.name = "UnrealBloomPass.v" + i;
        renderTargetVertical.texture.generateMipmaps = false;
        this.renderTargetsVertical.push(renderTargetVertical);
        resx = Math.round(resx / 2);
        resy = Math.round(resy / 2);
      } // luminosity high pass material

      if (THREE.LuminosityHighPassShader === undefined)
        console.error("THREE.UnrealBloomPass relies on THREE.LuminosityHighPassShader");
      const highPassShader = THREE.LuminosityHighPassShader;
      this.highPassUniforms = THREE.UniformsUtils.clone(highPassShader.uniforms);
      this.highPassUniforms["luminosityThreshold"].value = threshold;
      this.highPassUniforms["smoothWidth"].value = 0.01;
      this.materialHighPassFilter = new THREE.ShaderMaterial({
        uniforms: this.highPassUniforms,
        vertexShader: highPassShader.vertexShader,
        fragmentShader: highPassShader.fragmentShader,
        defines: {}
      }); // Gaussian Blur Materials

      this.separableBlurMaterials = [];
      const kernelSizeArray = [3, 5, 7, 9, 11];
      resx = Math.round(this.resolution.x / 2);
      resy = Math.round(this.resolution.y / 2);

      for (let i = 0; i < this.nMips; i++) {
        this.separableBlurMaterials.push(this.getSeperableBlurMaterial(kernelSizeArray[i]));
        this.separableBlurMaterials[i].uniforms["texSize"].value = new THREE.Vector2(resx, resy);
        resx = Math.round(resx / 2);
        resy = Math.round(resy / 2);
      } // Composite material

      this.compositeMaterial = this.getCompositeMaterial(this.nMips);
      this.compositeMaterial.uniforms["blurTexture1"].value = this.renderTargetsVertical[0].texture;
      this.compositeMaterial.uniforms["blurTexture2"].value = this.renderTargetsVertical[1].texture;
      this.compositeMaterial.uniforms["blurTexture3"].value = this.renderTargetsVertical[2].texture;
      this.compositeMaterial.uniforms["blurTexture4"].value = this.renderTargetsVertical[3].texture;
      this.compositeMaterial.uniforms["blurTexture5"].value = this.renderTargetsVertical[4].texture;
      this.compositeMaterial.uniforms["bloomStrength"].value = strength;
      this.compositeMaterial.uniforms["bloomRadius"].value = 0.1;
      this.compositeMaterial.needsUpdate = true;
      const bloomFactors = [1.0, 0.8, 0.6, 0.4, 0.2];
      this.compositeMaterial.uniforms["bloomFactors"].value = bloomFactors;
      this.bloomTintColors = [
        new THREE.Vector3(1, 1, 1),
        new THREE.Vector3(1, 1, 1),
        new THREE.Vector3(1, 1, 1),
        new THREE.Vector3(1, 1, 1),
        new THREE.Vector3(1, 1, 1)
      ];
      this.compositeMaterial.uniforms["bloomTintColors"].value = this.bloomTintColors; // copy material

      if (THREE.CopyShader === undefined) {
        console.error("THREE.UnrealBloomPass relies on THREE.CopyShader");
      }

      const copyShader = THREE.CopyShader;
      this.copyUniforms = THREE.UniformsUtils.clone(copyShader.uniforms);
      this.copyUniforms["opacity"].value = 1.0;
      this.materialCopy = new THREE.ShaderMaterial({
        uniforms: this.copyUniforms,
        vertexShader: copyShader.vertexShader,
        fragmentShader: copyShader.fragmentShader,
        blending: THREE.AdditiveBlending,
        depthTest: false,
        depthWrite: false,
        transparent: true
      });
      this.enabled = true;
      this.needsSwap = false;
      this._oldClearColor = new THREE.Color();
      this.oldClearAlpha = 1;
      this.basic = new THREE.MeshBasicMaterial();
      this.fsQuad = new THREE.FullScreenQuad(null);
    }

    dispose() {
      for (let i = 0; i < this.renderTargetsHorizontal.length; i++) {
        this.renderTargetsHorizontal[i].dispose();
      }

      for (let i = 0; i < this.renderTargetsVertical.length; i++) {
        this.renderTargetsVertical[i].dispose();
      }

      this.renderTargetBright.dispose();
    }

    setSize(width, height) {
      let resx = Math.round(width / 2);
      let resy = Math.round(height / 2);
      this.renderTargetBright.setSize(resx, resy);

      for (let i = 0; i < this.nMips; i++) {
        this.renderTargetsHorizontal[i].setSize(resx, resy);
        this.renderTargetsVertical[i].setSize(resx, resy);
        this.separableBlurMaterials[i].uniforms["texSize"].value = new THREE.Vector2(resx, resy);
        resx = Math.round(resx / 2);
        resy = Math.round(resy / 2);
      }
    }

    render(renderer, writeBuffer, readBuffer, deltaTime, maskActive) {
      renderer.getClearColor(this._oldClearColor);
      this.oldClearAlpha = renderer.getClearAlpha();
      const oldAutoClear = renderer.autoClear;
      renderer.autoClear = false;
      renderer.setClearColor(this.clearColor, 0);
      if (maskActive) renderer.state.buffers.stencil.setTest(false); // Render input to screen

      if (this.renderToScreen) {
        this.fsQuad.material = this.basic;
        this.basic.map = readBuffer.texture;
        renderer.setRenderTarget(null);
        renderer.clear();
        this.fsQuad.render(renderer);
      } // 1. Extract Bright Areas

      this.highPassUniforms["tDiffuse"].value = readBuffer.texture;
      this.highPassUniforms["luminosityThreshold"].value = this.threshold;
      this.fsQuad.material = this.materialHighPassFilter;
      renderer.setRenderTarget(this.renderTargetBright);
      renderer.clear();
      this.fsQuad.render(renderer); // 2. Blur All the mips progressively

      let inputRenderTarget = this.renderTargetBright;

      for (let i = 0; i < this.nMips; i++) {
        this.fsQuad.material = this.separableBlurMaterials[i];
        this.separableBlurMaterials[i].uniforms["colorTexture"].value = inputRenderTarget.texture;
        this.separableBlurMaterials[i].uniforms["direction"].value = UnrealBloomPass.BlurDirectionX;
        renderer.setRenderTarget(this.renderTargetsHorizontal[i]);
        renderer.clear();
        this.fsQuad.render(renderer);
        this.separableBlurMaterials[i].uniforms["colorTexture"].value =
          this.renderTargetsHorizontal[i].texture;
        this.separableBlurMaterials[i].uniforms["direction"].value = UnrealBloomPass.BlurDirectionY;
        renderer.setRenderTarget(this.renderTargetsVertical[i]);
        renderer.clear();
        this.fsQuad.render(renderer);
        inputRenderTarget = this.renderTargetsVertical[i];
      } // Composite All the mips

      this.fsQuad.material = this.compositeMaterial;
      this.compositeMaterial.uniforms["bloomStrength"].value = this.strength;
      this.compositeMaterial.uniforms["bloomRadius"].value = this.radius;
      this.compositeMaterial.uniforms["bloomTintColors"].value = this.bloomTintColors;
      renderer.setRenderTarget(this.renderTargetsHorizontal[0]);
      renderer.clear();
      this.fsQuad.render(renderer); // Blend it additively over the input texture

      this.fsQuad.material = this.materialCopy;
      this.copyUniforms["tDiffuse"].value = this.renderTargetsHorizontal[0].texture;
      if (maskActive) renderer.state.buffers.stencil.setTest(true);

      if (this.renderToScreen) {
        renderer.setRenderTarget(null);
        this.fsQuad.render(renderer);
      } else {
        renderer.setRenderTarget(readBuffer);
        this.fsQuad.render(renderer);
      } // Restore renderer settings

      renderer.setClearColor(this._oldClearColor, this.oldClearAlpha);
      renderer.autoClear = oldAutoClear;
    }

    getSeperableBlurMaterial(kernelRadius) {
      return new THREE.ShaderMaterial({
        defines: {
          KERNEL_RADIUS: kernelRadius,
          SIGMA: kernelRadius
        },
        uniforms: {
          colorTexture: {
            value: null
          },
          texSize: {
            value: new THREE.Vector2(0.5, 0.5)
          },
          direction: {
            value: new THREE.Vector2(0.5, 0.5)
          }
        },
        vertexShader: `varying vec2 vUv;
				void main() {
					vUv = uv;
					gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );
				}`,
        fragmentShader: `#include <common>
				varying vec2 vUv;
				uniform sampler2D colorTexture;
				uniform vec2 texSize;
				uniform vec2 direction;
				
				float gaussianPdf(in float x, in float sigma) {
					return 0.39894 * exp( -0.5 * x * x/( sigma * sigma))/sigma;
				}
				void main() {
					vec2 invSize = 1.0 / texSize;
					float fSigma = float(SIGMA);
					float weightSum = gaussianPdf(0.0, fSigma);
					vec3 diffuseSum = texture2D( colorTexture, vUv).rgb * weightSum;
					for( int i = 1; i < KERNEL_RADIUS; i ++ ) {
						float x = float(i);
						float w = gaussianPdf(x, fSigma);
						vec2 uvOffset = direction * invSize * x;
						vec3 sample1 = texture2D( colorTexture, vUv + uvOffset).rgb;
						vec3 sample2 = texture2D( colorTexture, vUv - uvOffset).rgb;
						diffuseSum += (sample1 + sample2) * w;
						weightSum += 2.0 * w;
					}
					gl_FragColor = vec4(diffuseSum/weightSum, 1.0);
				}`
      });
    }

    getCompositeMaterial(nMips) {
      return new THREE.ShaderMaterial({
        defines: {
          NUM_MIPS: nMips
        },
        uniforms: {
          blurTexture1: {
            value: null
          },
          blurTexture2: {
            value: null
          },
          blurTexture3: {
            value: null
          },
          blurTexture4: {
            value: null
          },
          blurTexture5: {
            value: null
          },
          bloomStrength: {
            value: 1.0
          },
          bloomFactors: {
            value: null
          },
          bloomTintColors: {
            value: null
          },
          bloomRadius: {
            value: 0.0
          }
        },
        vertexShader: `varying vec2 vUv;
				void main() {
					vUv = uv;
					gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );
				}`,
        fragmentShader: `varying vec2 vUv;
				uniform sampler2D blurTexture1;
				uniform sampler2D blurTexture2;
				uniform sampler2D blurTexture3;
				uniform sampler2D blurTexture4;
				uniform sampler2D blurTexture5;
				uniform float bloomStrength;
				uniform float bloomRadius;
				uniform float bloomFactors[NUM_MIPS];
				uniform vec3 bloomTintColors[NUM_MIPS];
				float lerpBloomFactor(const in float factor) {
					float mirrorFactor = 1.2 - factor;
					return mix(factor, mirrorFactor, bloomRadius);
				}
				void main() {
					gl_FragColor = bloomStrength * ( lerpBloomFactor(bloomFactors[0]) * vec4(bloomTintColors[0], 1.0) * texture2D(blurTexture1, vUv) +
						lerpBloomFactor(bloomFactors[1]) * vec4(bloomTintColors[1], 1.0) * texture2D(blurTexture2, vUv) +
						lerpBloomFactor(bloomFactors[2]) * vec4(bloomTintColors[2], 1.0) * texture2D(blurTexture3, vUv) +
						lerpBloomFactor(bloomFactors[3]) * vec4(bloomTintColors[3], 1.0) * texture2D(blurTexture4, vUv) +
						lerpBloomFactor(bloomFactors[4]) * vec4(bloomTintColors[4], 1.0) * texture2D(blurTexture5, vUv) );
				}`
      });
    }
  }

  UnrealBloomPass.BlurDirectionX = new THREE.Vector2(1.0, 0.0);
  UnrealBloomPass.BlurDirectionY = new THREE.Vector2(0.0, 1.0);

  THREE.UnrealBloomPass = UnrealBloomPass;
})();