使用此pass canvas元素的background都能看到 不过相应的辉光颜色和背景颜色不相容的地方看起来颜色会怪一些如图不过如果是纯色就没什么问题了
//@ts-nocheck
/*
* @Author: hongbin
* @Date: 2023-04-06 11:44:14
* @LastEditors: hongbin
* @LastEditTime: 2023-04-06 11:49:23
* @Description:
*/
import {
AdditiveBlending,
Color,
LinearFilter,
MeshBasicMaterial,
RGBAFormat,
ShaderMaterial,
Texture,
UniformsUtils,
Vector2,
Vector3,
WebGLRenderer,
WebGLRenderTarget,
} from "three";
import { Pass } from "three/examples/jsm/postprocessing/Pass";
// typescript definitions doesn't have FullScreenQuad
//@ts-ignore
import { FullScreenQuad } from "three/examples/jsm/postprocessing/Pass";
import { CopyShader } from "three/examples/jsm/shaders/CopyShader.js";
import { LuminosityHighPassShader } from "three/examples/jsm/shaders/LuminosityHighPassShader.js";
/**
* Thanks to https://github.com/mrdoob/three.js/issues/14104#issuecomment-429664412 for this fragmentShaderfix
*
* 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 TransparentBackgroundFixedUnrealBloomPass extends Pass {
strength: number;
radius: number;
threshold: number;
resolution: Vector2;
clearColor: Color;
renderTargetsHorizontal: any[];
renderTargetsVertical: any[];
nMips: number;
renderTargetBright: WebGLRenderTarget;
highPassUniforms: any;
materialHighPassFilter: ShaderMaterial;
separableBlurMaterials: any[];
compositeMaterial: ShaderMaterial;
bloomTintColors: Vector3[];
copyUniforms: any;
materialCopy: ShaderMaterial;
_oldClearColor: Color;
oldClearAlpha: number;
basic: MeshBasicMaterial;
fsQuad: Pass.FullScreenQuad;
static BlurDirectionX: any;
static BlurDirectionY: any;
constructor(
resolution: Vector2,
strength: number,
radius: number,
threshold: number
) {
super();
this.strength = strength !== undefined ? strength : 1;
this.radius = radius;
this.threshold = threshold;
this.resolution =
resolution !== undefined
? new Vector2(resolution.x, resolution.y)
: new Vector2(256, 256);
// create color only once here, reuse it later inside the render function
this.clearColor = new Color(0, 0, 0);
// render targets
const pars = {
minFilter: LinearFilter,
magFilter: LinearFilter,
format: RGBAFormat,
};
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 WebGLRenderTarget(resx, resy, pars);
this.renderTargetBright.texture.name = "UnrealBloomPass.bright";
this.renderTargetBright.texture.generateMipmaps = false;
for (let i = 0; i < this.nMips; i++) {
const renderTargetHorizonal = new WebGLRenderTarget(
resx,
resy,
pars
);
renderTargetHorizonal.texture.name = "UnrealBloomPass.h" + i;
renderTargetHorizonal.texture.generateMipmaps = false;
this.renderTargetsHorizontal.push(renderTargetHorizonal);
const renderTargetVertical = new WebGLRenderTarget(
resx,
resy,
pars
);
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 (LuminosityHighPassShader === undefined)
console.error(
"THREE.UnrealBloomPass relies on LuminosityHighPassShader"
);
const highPassShader = LuminosityHighPassShader;
this.highPassUniforms = UniformsUtils.clone(highPassShader.uniforms);
this.highPassUniforms["luminosityThreshold"].value = threshold;
this.highPassUniforms["smoothWidth"].value = 0.01;
this.materialHighPassFilter = new 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 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 Vector3(1, 1, 1),
new Vector3(1, 1, 1),
new Vector3(1, 1, 1),
new Vector3(1, 1, 1),
new Vector3(1, 1, 1),
];
this.compositeMaterial.uniforms["bloomTintColors"].value =
this.bloomTintColors;
// copy material
if (CopyShader === undefined) {
console.error("THREE.UnrealBloomPass relies on CopyShader");
}
const copyShader = CopyShader;
this.copyUniforms = UniformsUtils.clone(copyShader.uniforms);
this.copyUniforms["opacity"].value = 1.0;
this.materialCopy = new ShaderMaterial({
uniforms: this.copyUniforms,
vertexShader: copyShader.vertexShader,
fragmentShader: copyShader.fragmentShader,
blending: AdditiveBlending,
depthTest: false,
depthWrite: false,
transparent: true,
});
this.enabled = true;
this.needsSwap = false;
this._oldClearColor = new Color();
this.oldClearAlpha = 1;
this.basic = new MeshBasicMaterial();
this.fsQuad = new 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: number, height: number) {
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 Vector2(resx, resy);
resx = Math.round(resx / 2);
resy = Math.round(resy / 2);
}
}
render(
renderer: WebGLRenderer,
writeBuffer: any,
readBuffer: { texture: Texture },
deltaTime: any,
maskActive: any
) {
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 =
TransparentBackgroundFixedUnrealBloomPass.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 =
TransparentBackgroundFixedUnrealBloomPass.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: number) {
return new ShaderMaterial({
defines: {
KERNEL_RADIUS: kernelRadius,
SIGMA: kernelRadius,
},
uniforms: {
colorTexture: { value: null },
texSize: { value: new Vector2(0.5, 0.5) },
direction: { value: new 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);
float alphaSum = 0.0;
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;
vec4 sample1 = texture2D( colorTexture, vUv + uvOffset);
vec4 sample2 = texture2D( colorTexture, vUv - uvOffset);
diffuseSum += (sample1.rgb + sample2.rgb) * w;
alphaSum += (sample1.a + sample2.a) * w;
weightSum += 2.0 * w;
}
gl_FragColor = vec4(diffuseSum/weightSum, alphaSum/weightSum);
}`,
});
}
getCompositeMaterial(nMips: number) {
return new ShaderMaterial({
defines: {
NUM_MIPS: nMips,
},
uniforms: {
blurTexture1: { value: null },
blurTexture2: { value: null },
blurTexture3: { value: null },
blurTexture4: { value: null },
blurTexture5: { value: null },
dirtTexture: { 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 sampler2D dirtTexture;
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) );
}`,
});
}
}
TransparentBackgroundFixedUnrealBloomPass.BlurDirectionX = new Vector2(
1.0,
0.0
);
TransparentBackgroundFixedUnrealBloomPass.BlurDirectionY = new Vector2(
0.0,
1.0
);
export { TransparentBackgroundFixedUnrealBloomPass as UnrealBloomPass };
