原理简介:

        1. 基于rendering pass graph实现。

        2. WGSL Shader 基于文件系统和宏机制动态组装。

当前示例源码github地址:

https://github.com/vilyLei/voxwebgpu/blob/feature/rendering/src/voxgpu/sample/PBRShadowTest.ts

当前示例运行效果:

此示例基于此渲染系统实现，当前示例TypeScript源码如下：

class ShadowPassGraph extends WGRPassNodeGraph {private entities: Entity3D[] = [];private mDepthMaterials: WGMaterial[];shadowDepthRTT = { uuid: "rtt-shadow-depth", rttTexture: {}, shdVarName: 'shadowData' };depAttachment: WGRPassColorAttachment = {texture: this.shadowDepthRTT,clearValue: { r: 1, g: 1, b: 1, a: 1.0 },loadOp: "clear",storeOp: "store"};occVRTT = { uuid: "rtt-shadow-occV", rttTexture: {}, shdVarName: 'shadowData' };occHRTT = { uuid: "rtt-shadow-occH", rttTexture: {}, shdVarName: 'shadowData' };occVEntity: FixScreenPlaneEntity;occHEntity: FixScreenPlaneEntity;shadowBias = -0.0005;shadowRadius = 2.0;shadowMapW = 512;shadowMapH = 512;shadowViewW = 1300;shadowViewH = 1300;shadowCamera: Camera;constructor() {super();}private initMaterial(): void {const shadowDepthShdSrc = {shaderSrc: { code: shadowDepthWGSL, uuid: "shadowDepthShdSrc" }};this.mDepthMaterials = [this.createDepthMaterial(shadowDepthShdSrc)];}private createDepthMaterial(shaderSrc: WGRShderSrcType, faceCullMode = "none"): WGMaterial {let pipelineDefParam = {depthWriteEnabled: true,faceCullMode,blendModes: [] as string[]};const material = new WGMaterial({shadinguuid: "shadow-depth_material",shaderSrc,pipelineDefParam});return material;}private buildShadowCam(): void {const g = this;const cam = new Camera({eye: [600.0, 800.0, -600.0],near: 0.1,far: 1900,perspective: false,viewWidth: g.shadowViewW,viewHeight: g.shadowViewH});cam.update();g.shadowCamera = cam;}addEntity(entity: Entity3D): ShadowPassGraph {let pass = this.passes[0];let et = new Entity3D({ transform: entity.transform });et.materials = this.mDepthMaterials;et.geometry = entity.geometry;et.rstate.copyFrom(entity.rstate);this.entities.push(et);pass.addEntity(et);return this;}addEntities(entities: Entity3D[]): ShadowPassGraph {let es = entities;for (let i = 0; i < es.length; ++i) {this.addEntity(es[i]);}return this;}initialize(rc: RendererScene): ShadowPassGraph {let colorAttachments = [this.depAttachment];// create a separate rtt rendering passlet multisampleEnabled = false;let pass = rc.createRTTPass({ colorAttachments, multisampleEnabled });this.passes = [pass];rc.setPassNodeGraph(this);this.buildShadowCam();pass.node.camera = this.shadowCamera;this.initMaterial();this.initocc();return this;}private initocc(): void {let pass = this.passes[0];let extent = [-1, -1, 2, 2];let material = new ShadowOccBlurMaterial();let ppt = material.property;ppt.setShadowRadius(this.shadowRadius);ppt.setViewSize(this.shadowMapW, this.shadowMapH);material.addTextures([this.shadowDepthRTT]);this.occVEntity = new FixScreenPlaneEntity({ extent, materials: [material] });this.occVEntity.visible = false;pass.addEntity(this.occVEntity);material = new ShadowOccBlurMaterial();ppt = material.property;ppt.setShadowRadius(this.shadowRadius);ppt.setViewSize(this.shadowMapW, this.shadowMapH);ppt.toHorizonalBlur();material.addTextures([this.occVRTT]);this.occHEntity = new FixScreenPlaneEntity({ extent, materials: [material] });this.occHEntity.visible = false;pass.addEntity(this.occHEntity);}run(): void {let pass = this.passes[0];let attachment = this.depAttachment;attachment.texture = this.shadowDepthRTT;let es = this.entities;for (let i = 0; i < es.length; ++i) {es[i].visible = true;}pass.render();for (let i = 0; i < es.length; ++i) {es[i].visible = false;}attachment.texture = this.occVRTT;this.occVEntity.visible = true;pass.render();this.occVEntity.visible = false;attachment.texture = this.occHRTT;this.occHEntity.visible = true;pass.render();this.occHEntity.visible = false;}
}
export class PBRShadowTest {private mRscene = new RendererScene();private mGraph = new ShadowPassGraph();initialize(): void {this.mRscene.initialize({canvasWith: 512,canvasHeight: 512,rpassparam: { multisampleEnabled: true }});this.initShadowScene();this.initEvent();}private mEntities: Entity3D[] = [];private initShadowScene(): void {let rc = this.mRscene;let position = [-230.0, 100.0, -200.0];let materials = this.createMaterials(position);let sph = new SphereEntity({radius: 80,transform: {position},materials});this.mEntities.push(sph);rc.addEntity(sph);position = [160.0, 100.0, -210.0];materials = this.createMaterials(position);let box = new BoxEntity({minPos: [-30, -30, -30],maxPos: [130, 230, 80],transform: {position,rotation: [50, 130, 80]},materials});this.mEntities.push(box);rc.addEntity(box);position = [160.0, 100.0, 210.0];materials = this.createMaterials(position);let torus = new TorusEntity({transform: {position,rotation: [50, 30, 80]},materials});this.mEntities.push(torus);rc.addEntity(torus);this.buildShadow();}private buildShadow(): void {this.initShadowPass();this.initShadowReceiveDisp(true);this.buildShadowCamFrame();}private mShadowTransMat: Matrix4;private initShadowPass(): void {let rc = this.mRscene;const graph = this.mGraph;graph.initialize(rc).addEntities(this.mEntities);let cam = graph.shadowCamera;let transMatrix = new Matrix4();transMatrix.setScaleXYZ(0.5, -0.5, 0.5);transMatrix.setTranslationXYZ(0.5, 0.5, 0.5);let shadowMat = new Matrix4();shadowMat.copyFrom(cam.viewProjMatrix);shadowMat.append(transMatrix);this.mShadowTransMat = shadowMat;let extent = [-0.95, -0.95, 0.4, 0.4];let entity = new FixScreenPlaneEntity({ extent, flipY: true, textures: [{ diffuse: graph.shadowDepthRTT }] });rc.addEntity(entity);extent = [-0.5, -0.95, 0.4, 0.4];entity = new FixScreenPlaneEntity({ extent, flipY: true, textures: [{ diffuse: graph.occVRTT }] });rc.addEntity(entity);extent = [-0.05, -0.95, 0.4, 0.4];entity = new FixScreenPlaneEntity({ extent, flipY: true, textures: [{ diffuse: graph.occHRTT }] });rc.addEntity(entity);}private buildShadowCamFrame(): void {const graph = this.mGraph;const cam = graph.shadowCamera;const rsc = this.mRscene;let frameColors = [[1.0, 0.0, 1.0], [0.0, 1.0, 1.0], [1.0, 0.0, 0.0], [0.0, 1.0, 1.0]];let boxFrame = new BoundsFrameEntity({ vertices8: cam.frustum.vertices, frameColors });rsc.addEntity(boxFrame);}private initEvent(): void {const rc = this.mRscene;rc.addEventListener(MouseEvent.MOUSE_DOWN, this.mouseDown);new MouseInteraction().initialize(rc, 0, false).setAutoRunning(true);}private initShadowReceiveDisp(shadowReceived = false): void {let rc = this.mRscene;let position = new Vector3(0, -1, 0);let materials = this.createMaterials(position, shadowReceived);let plane = new PlaneEntity({axisType: 1,materials,extent:[-600,-600,1200,1200],transform: { position }});rc.addEntity(plane);}private hdrEnvtex = new SpecularEnvBrnTexture();private createBaseTextures(shadowReceived = false): WGTextureDataDescriptor[] {const albedoTex = { albedo: { url: `static/assets/pbrtex/rough_plaster_broken_diff_1k.jpg` } };const normalTex = { normal: { url: `static/assets/pbrtex/rough_plaster_broken_nor_1k.jpg` } };const armTex = { arm: { url: `static/assets/pbrtex/rough_plaster_broken_arm_1k.jpg` } };let textures = [this.hdrEnvtex,albedoTex,normalTex,armTex] as WGTextureDataDescriptor[];if(shadowReceived) {textures.push( this.mGraph.occHRTT );}return textures;}private createMaterials(position: Vector3DataType, shadowReceived = false, uvParam?: number[]): BasePBRMaterial[] {let textures0 = this.createBaseTextures(shadowReceived);let material0 = this.createMaterial(position, textures0, ["solid"]);this.applyMaterialPPt(material0, shadowReceived);let list = [material0];if (uvParam) {for (let i = 0; i < list.length; ++i) {list[i].property.uvParam.value = uvParam;}}return list;}private applyMaterialPPt(material: BasePBRMaterial, shadowReceived = false): void {let property = material.property;property.ambient.value = [0.0, 0.2, 0.2];property.albedo.value = [0.7, 0.7, 0.3];property.arms.roughness = 0.8;property.armsBase.value = [0, 0, 0];property.param.scatterIntensity = 32;const graph = this.mGraph;let cam = graph.shadowCamera;property.shadowReceived = shadowReceived;if(shadowReceived) {property.shadowMatrix.shadowMatrix = this.mShadowTransMat;let vsmParams = property.vsmParams;vsmParams.radius = graph.shadowRadius;vsmParams.bias = graph.shadowBias;vsmParams.setSize(graph.shadowMapW, graph.shadowMapH);vsmParams.direction = cam.nv;vsmParams.intensity = 0.5;}}private mLightParams: LightShaderDataParam[] = [];private createMaterial(position: Vector3DataType, textures: WGTextureDataDescriptor[], blendModes: string[], depthCompare = 'less', lightParam?: LightShaderDataParam): BasePBRMaterial {if (!lightParam) {lightParam = createLightData(position);this.mLightParams.push(lightParam);}let pipelineDefParam = {depthWriteEnabled: true,faceCullMode: 'back',blendModes,depthCompare};let material = new BasePBRMaterial({ pipelineDefParam });material.setLightParam(lightParam);material.addTextures(textures);return material;}private mouseDown = (evt: MouseEvent): void => {};run(): void {this.mRscene.run();}
}