index.js

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f=this.getRightVector();this.position=E(this.position,I(f,this.speed))}moveRight(){let f=this.getRightVector();this.position=v(this.position,I(f,this.speed))}rotateY(f){this.yaw+=f}}class kf{direction;color;intensity;constructor(f,k,A){this.direction=f,this.color=k,this.intensity=A}}class Af{canvas;ctx;width;height;running=!1;timescale=0.001;littleEndian;imageData;buffer;buf8;data32;zBuffer;objModels=[];mainCamera=null;mainDirectionalLight=null;lastFpsUpdate=0;frameCount=0;fps=0;options;projMatrix;rasterWorker;constructor(f,k={}){this.options=k,this.canvas=document.getElementById(f),this.ctx=this.canvas.getContext("2d"),this.width=this.canvas.width,this.height=this.canvas.height,this.imageData=this.ctx?.getImageData(0,0,this.width,this.height);let A=this.imageData.data.length;this.buffer=new ArrayBuffer(A),this.buf8=new Uint8ClampedArray(this.buffer),this.data32=new Uint32Array(this.buffer);let _=new Uint32Array([168496141]),R=new Uint8Array(_.buffer);this.littleEndian=R[0]===13,this.zBuffer=new Float32Array(this.width*this.height),this.clearZ();let K=this.width/this.height;this.projMatrix=Mf(Math.PI/3,K,0.1,100),this.rasterWorker=new Worker("./src/RasterWorker.js"),this.rasterWorker.onmessage=(F)=>{let{buf8:q}=F.data;this.buf8.set(q),this.present()}}drawLine3DEFLA(f,k,A,_,R,K,F,q,H,W=255){let $=Math.abs(_-f),V=Math.abs(R-k),J=Math.abs(K-A),Q=f<_?1:-1,C=k<R?1:-1,Y=A<K?1:-1,X=Math.max($,V,J),U=0,N=0;if(X===$)U=V,N=J;else if(X===V)U=$,N=J;else U=$,N=V;let Z=U===0?0:(U<<16)/X,D=N===0?0:(N<<16)/X,G=0,O=0;for(let P=0;P<=X;P++){if(this.depthTest(f,k,A))this.setPixel(f,k,F,q,H,W);if(X===$)f+=Q,G+=Z,O+=D,k+=(G>>16)*C,A+=(O>>16)*Y,G&=65535,O&=65535;else if(X===V)k+=C,G+=Z,O+=D,f+=(G>>16)*Q,A+=(O>>16)*Y,G&=65535,O&=65535;else A+=Y,G+=Z,O+=D,f+=(G>>16)*Q,k+=(O>>16)*C,G&=65535,O&=65535}}drawTriangleScanline(f,k,A,_={x:200,y:120,z:60}){let[R,K,F]=[f,k,A].sort((Y,X)=>Y.y-X.y),q=Math.max(0,Math.ceil(Math.min(R.y,K.y,F.y))),H=Math.min(this.height-1,Math.floor(Math.max(R.y,K.y,F.y))),W=J(R,F),$=J(R,K),V=J(K,F);for(let Y=q;Y<=H;Y++){let X=Q(W,Y),U=Y<K.y?Q($,Y):Q(V,Y);if(X>U)[X,U]=[U,X];let N=Math.max(0,Math.ceil(X)),Z=Math.min(this.width-1,Math.floor(U));for(let D=N;D<=Z;D++){let G=U===X?0:(D-X)/(U-X),O=C(W,$,V,D,Y,G);if(this.depthTest(D,Y,O))this.setPixel(D,Y,_.x,_.y,_.z)}}function J(Y,X){let U=X.y-Y.y,N=X.x-Y.x,Z=X.z-Y.z;return{vStart:Y,vEnd:X,dx:N,dy:U,dz:Z}}function Q(Y,X){let{vStart:U,vEnd:N,dx:Z,dy:D}=Y;if(D===0)return U.x;return U.x+Z*((X-U.y)/D)}function C(Y,X,U,N,Z,D){return Y.vStart.z+(Y.vEnd.z-Y.vStart.z)*D}}start(){if(this.running)return;this.running=!0,this.lastFpsUpdate=performance.now(),this.frameCount=0;let f=(k)=>{this.clear(20,20,30),this.clearZ(),this.renderPixel(k*this.timescale),this.present(),this.frameCount++;let A=performance.now();if(A-this.lastFpsUpdate>=1000)this.fps=this.frameCount,this.frameCount=0,this.lastFpsUpdate=A;if(this.ctx.fillStyle="white",this.ctx.font="16px monospace",this.ctx.fillText(`FPS: ${this.fps}`,10,20),this.running)requestAnimationFrame(f)};requestAnimationFrame(f)}stop(){this.running=!1}benchmark(f=300){this.running=!1;let k=performance.now();for(let R=0;R<f;R++)this.clear(20,20,30),this.clearZ(),this.renderPixel(R*this.timescale),this.present();let A=performance.now(),_=f/((A-k)/1000);this.ctx.fillStyle="white",this.ctx.font="16px monospace",this.ctx.fillText(`FPS: ${_.toFixed(2)}`,10,20)}renderPixel(f){let k=wf(f),A=this.mainCamera.getForwardVector(),_={x:this.mainCamera.position.x+A.x,y:this.mainCamera.position.y+A.y,z:this.mainCamera.position.z+A.z},R=Tf(this.mainCamera.position,_,this.mainCamera.up),K=t(R,k),F=t(this.projMatrix,K);for(let q of this.objModels)for(let H of q.meshes)this.renderMesh(H,F,k);if(this.imageData)this.imageData.data.set(this.buf8),this.ctx.putImageData(this.imageData,0,0)}renderMesh(f,k,A){let{positions:_,normals:R,uvs:K,indices:F}=f,q=[];for(let H=0;H<F.length;H+=3){let W=F[H]*3,$=F[H+1]*3,V=F[H+2]*3,J={x:_[W],y:_[W+1],z:_[W+2]},Q={x:_[$],y:_[$+1],z:_[$+2]},C={x:_[V],y:_[V+1],z:_[V+2]};q.push({v0:J,v1:Q,v2:C,i:H})}for(let H of q)this.renderTriangle(F,H.i,_,R,K,k,A)}renderTriangle(f,k,A,_,R,K,F){let q=f[k]*3,H=f[k+1]*3,W=f[k+2]*3,$={x:A[q],y:A[q+1],z:A[q+2]},V={x:A[H],y:A[H+1],z:A[H+2]},J={x:A[W],y:A[W+1],z:A[W+2]},Q=uf($,V,J,K,this.width,this.height);if(!Q)return;if(this.options.snapVertices)Q[0]=e(Q[0],5),Q[1]=e(Q[1],5),Q[2]=e(Q[2],5);if(Lf(Q[0],Q[1],Q[2],this.width,this.height))return;let C=Q[0].x,Y=Q[0].y,X=Q[1].x,U=Q[1].y,N=Q[2].x,Z=Q[2].y;if((X-C)*(Z-Y)-(U-Y)*(N-C)>0)return;let G=g(F,{x:$.x,y:$.y,z:$.z,w:1}),O=g(F,{x:V.x,y:V.y,z:V.z,w:1}),P=g(F,{x:J.x,y:J.y,z:J.z,w:1}),h=E({x:O.x,y:O.y,z:O.z},{x:G.x,y:G.y,z:G.z}),w=E({x:P.x,y:P.y,z:P.z},{x:G.x,y:G.y,z:G.z}),u=z(Q[0],q,f[k]*2,_,R),L=z(Q[1],H,f[k+1]*2,_,R),B=z(Q[2],W,f[k+2]*2,_,R);if(this.options.shading==="flat")this.renderFlatShading(u,L,B,h,w);else if(this.options.shading==="blinn-phong")this.renderBlinnPhongShading(u,L,B,$,V,J,_);else if(this.options.shading==="wireframe")return}renderFlatShading(f,k,A,_,R){let F=this.mainDirectionalLight.direction,q=T(F),H={x:200,y:120,z:60},W=0.85,$=T(y(_,R)),V=Math.max(0,b($,{x:-q.x,y:-q.y,z:-q.z}))*this.mainDirectionalLight.intensity,J={x:Math.max(0,Math.min(255,H.x*(0.15+0.85*V))),y:Math.max(0,Math.min(255,H.y*(0.15+0.85*V))),z:Math.max(0,Math.min(255,H.z*(0.15+0.85*V)))};this.drawTriangleScanline(f,k,A,J)}renderBlinnPhongShading(f,k,A,_,R,K,F){let q=T({x:-this.mainCamera.position.x,y:-this.mainCamera.position.y,z:-this.mainCamera.position.z}),H=[l(_,{x:F[0],y:F[1],z:F[2]},q,this.mainDirectionalLight),l(R,{x:F[3],y:F[4],z:F[5]},q,this.mainDirectionalLight),l(K,{x:F[6],y:F[7],z:F[8]},q,this.mainDirectionalLight)];f.color=[H[0].x,H[0].y,H[0].z],k.color=[H[1].x,H[1].y,H[1].z],A.color=[H[2].x,H[2].y,H[2].z],this.drawTriangleScanline(f,k,A)}clearZ(){this.zBuffer.fill(Number.POSITIVE_INFINITY)}clear(f=0,k=0,A=0,_=255){let R=this.packRGBA(f,k,A,_);this.data32.fill(R)}present(){if(!this.imageData)return;this.imageData.data.set(this.buf8),this.ctx.putImageData(this.imageData,0,0)}packRGBA(f,k,A,_=255){if(this.littleEndian)return _<<24|A<<16|k<<8|f;else return f<<24|k<<16|A<<8|_}setPixel(f,k,A,_,R,K=255){if(f<0||f>=this.width||k<0||k>=this.height)return;let F=k*this.width+f;this.data32[F]=this.packRGBA(A|0,_|0,R|0,K|0)}depthTest(f,k,A){let _=k*this.width+f;if(A>=this.zBuffer[_])return!1;return this.zBuffer[_]=A,!0}setCamera(f){this.mainCamera=f}setDirectionalLight(f){this.mainDirectionalLight=f}addModel(f){this.objModels.push(f)}}var df={shading:"flat",snapVertices:!1};async function mf(){let f=new Af("canvas",df),A=await new s().loadFromUrl("src/Examples/teddyBear.obj"),_=new ff({x:-50,y:0,z:0},{x:0,y:1,z:0},1);f.setCamera(_);let R=new kf({x:-1,y:-1,z:-1},{x:1,y:1,z:1},0.6);f.setDirectionalLight(R),f.addModel(A),f.start()}mf();