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264 lines
9.2 KiB
264 lines
9.2 KiB
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vec3 foregroundColor = vec3(.0841, .5329, .9604);
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vec3 groundColor = vec3(.2, .3, .5);
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vec4 groundSpecular = vec4(.71, .71, .71, 10.);
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uniform float uTime;// TIME, IN SECONDS
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uniform int flags;
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//FLAGS 0-TEX, 1-RT, 2-MOVED, 3-FLASH, 4-TEX_ROT, 5-CLOUD
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uniform vec4 rot; //ROTATION VALUES USED TO CALCULATE TRANSFORMATION MATRIX
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//rot=[cosx, sinx, cosy, siny], x, y BING ROTATED ANGLE
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uniform float dFL; //DELTA on FOCAL LENGTH
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uniform vec3 fDir;//Flash light direction
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varying vec3 vPos;// -1 < vPos.x < +1
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// -1 < vPos.y < +1
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// vPos.z == 0
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float fl=3.;//ORIGINAL FOCAL LENGTH
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const float pi=3.14159265359;
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const float _2pi=2.*pi;
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const int n_ref=9; //2^(hits) + 1 because each hit now spawn 2 rays.
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//const int ns=4; ns is added from .js
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vec4 Sph[ns];
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uniform sampler2D uSampler[ns];
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vec3 Ambient[ns];
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vec3 Diffuse[ns];
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vec4 Specular[ns];
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float ks[ns];
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float kr[ns];
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float kf[ns], kf_air = 1.000293;
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int type[ns];//Nested objects
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// 1-sphere, 2-compost sphere, 3-
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struct Object{ //UPDATED SPHERE STRUCTURE THAT SUPPORTS TRANSPARENCY.(UNUSED)
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vec4 Pos;
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vec3 Ambient;
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vec3 Diffuse;
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vec4 Specular;
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int textureid;
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float ks, kt, kr;
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};
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struct RT{ //STACK FOR RECURSIVE RAY TRACING.
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vec3 color;
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float ks;
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} ;
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vec3 scolor = vec3(0,0,0); //Actually 2^n_ref
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struct Ray{
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vec3 V;
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vec3 W;
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float kf, cumulativeK;
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} lastRay[n_ref/2];
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bool modulo2(int n){
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return n-2*(n/2) == 1;
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}
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bool getflag(int flag,int bit){
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int shifted = flag / int(pow(2.,float(bit)));
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return modulo2(shifted);
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}
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float clampv(float val,float l,float h){
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return val<l?l:val>h?h:val;
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}
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void main(){
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vec3 LDir=vec3(.5,.5,.5);
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vec3 LCol=vec3(1.,1.,1.);
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// SPHERE
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Sph[3]=vec4(.9*sin(uTime*.4),0.,.9*cos(uTime*.4),.25);
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Sph[2]=vec4(.22*sin(uTime*1.2),0.05,.22*cos(uTime*1.2),.02);
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Sph[0]=vec4(.45*sin(uTime),0.05*cos(uTime + 1.),.45*cos(uTime),.1);
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Sph[1]=vec4(0.,0.,0.,.15);
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// SURFACE REFLECTANCE PROPERTIES, can be transferred from .js
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Ambient[3]=vec3(.1,.1,.1);// r,g,b
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Diffuse[3]=vec3(.71,.71,.71);// r,g,b
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Specular[3]=vec4(.71,.71,.71,10.);// r,g,b,power
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Ambient[2]=vec3(.1,.05,.05);// r,g,b
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Diffuse[2]=vec3(.71,.71,.71);// r,g,b
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Specular[2]=vec4(.71,.71,.71,10.);// r,g,b,power
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Ambient[1]=vec3(.1,.05,.05);// r,g,b
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Diffuse[1]=vec3(1.,.5,.5);// r,g,b
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Specular[1]=vec4(1.,.5,.5,10.);// r,g,b,power
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Ambient[0]=vec3(.05,.05,.1);// r,g,b
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Diffuse[0]=vec3(.5,.5,1.);// r,g,b
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Specular[0]=vec4(1.,.5,.5,20.);// r,g,b,power
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ks[0] = 0.25;
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ks[1] = 0.1;
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ks[2] = 0.3;
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ks[3] = 0.05;
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kr[0] = 0.25;
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kr[1] = 0.1;
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kr[2] = 0.3;
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kr[3] = 0.05;
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kf[0] = 1.3;
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kf[1] = 1.3; //Water
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kf[2] = 1.5; //Glass
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kf[3] = 1.; //Vacuum
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float currKf = kf_air;
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vec3 color=vec3(.2, .3, .5);
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float ca=rot.x, sa = rot.y, cb=rot.z, sb=rot.w;
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mat3 transformation, invTr;//Transformation matrix for viewpoint.
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transformation[0] = vec3(ca, sb*sa, sa*cb);//because the matrices are all the same,
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transformation[1] = vec3(0, cb, -sb);//We don't need to calculate it for every pixel
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transformation[2] = vec3(-sa,ca*sb,ca*cb);//So, we get it from the CPU
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invTr[0] = vec3(ca, 0, -sa);//it's inverse, to calculate texture mapping.
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invTr[1] = vec3(sa*sb, cb, ca*sb);
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invTr[2] = vec3(cb*sa, -sb, ca*cb);
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vec3 trPos = transformation*((dFL+fl+1.)/(fl+1.))*vec3(vPos.xy, -1);
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vec3 V0=transformation*vec3(0.,0.,fl+dFL), V = V0;
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vec3 W=normalize(trPos-V);
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bool rtxoff = getflag(flags, 1),
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showtexture = !getflag(flags,0),
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moved = getflag(flags,2);
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int cnt_ref = n_ref;
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float currentK = 1.;
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for(int j=0;j<n_ref;j++)
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{
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if(j > 0){
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Ray currR = lastRay[(j-1)/2];
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currKf = currR.kf;
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currentK = currR.cumulativeK;
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if(currKf <= 0.0000001 || currentK <= 0.0000001)
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continue; // We make it terminate w/ kf=0
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V = currR.V;
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W = currR.W;
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}
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float tMin=10000.;
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int iMin = -1;
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for(int i=0;i<cns;i++){
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// SHIFT COORDINATES, SO THAT SPHERE IS AT (0,0,0)
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vec3 Vp=V-Sph[i].xyz;
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// SOLVE FOR QUADRATIC EQUATION IN t
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float B=dot(W,Vp);
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float C=dot(Vp,Vp)-Sph[i].w*Sph[i].w;
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float D=B*B-C;
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if(D>0.){
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float t=-B-sqrt(D);
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if(t >= 0.00001 && t < tMin){
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tMin = t; // This is an optimization, we don't have to do lighting/tex
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iMin = i; // for objects that are occuluded, which is expensive!
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}
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else if (t >= -0.00001){
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t = -(t + 2.*B);
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if(t < tMin){
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tMin = t;
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iMin = i;
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}
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}
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}
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}
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// IF RAY HITS SPHERE
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if(iMin >= 0){
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float t = tMin;
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vec3 S=V+t*W;
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for(int i = 0; i < cns; ++ i)
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if(i == iMin)
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{
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vec3 tex_sph = (S-Sph[i].xyz);
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if(moved)
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tex_sph=invTr*tex_sph;
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float R=Sph[i].w;
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float tex_x=acos(abs(tex_sph.x)/sqrt(R*R-tex_sph.y*tex_sph.y));
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if(tex_sph.x>0.)
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tex_x=pi-tex_x;
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tex_x*=1.5708;//*Correct aspect ratio of texture 2:1 -> 2pir:2r
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tex_x=tex_x+float(uTime);
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float quo=float(int(tex_x/_2pi));
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tex_x=tex_x/_2pi - quo;
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vec3 texture_color;
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if(showtexture)
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texture_color=texture2D(uSampler[i],vec2(tex_x,((R-tex_sph.y)/(2.*R)))).xyz;
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else texture_color = foregroundColor;
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vec3 N=normalize(S-Sph[i].xyz);
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vec3 realLDir=normalize(LDir-S);
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color=(
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Ambient[i]
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+Diffuse[i]*max(0.,dot(N,realLDir))*LCol
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)*texture_color
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;
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if(rtxoff || j >= n_ref/2) //if it's the last hit
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{
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color += sqrt(float(j+1)) * Specular[i].xyz*pow(max(0.,
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dot(2.*dot(N,realLDir)*N-realLDir,-W)),Specular[i].w);
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scolor += color * currentK;
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}
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else{
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lastRay[2 * j + 1] = Ray(S, (-(2. * dot(N, W) * N - W)), currKf, currentK * ks[i]); //reflection
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float ita = currKf/kf[i];
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float c1 = dot(N, W);
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float c2 = sqrt(1.-ita*ita*(1.-c1*c1));
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lastRay[2 * j + 2] = Ray(S, normalize(ita*W + (ita*c1 - c2)*N), kf[i], currentK * kr[i]); //refraction
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scolor += currentK*(1. - ks[i] - kr[i]) * color;//stack[j] = RT(color, currentK*(1. - ks[i] - kr[i]) * color;
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}
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break;
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}
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}
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else {
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float t = -(.2+V.y)/W.y;
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float sx = V.x + t* W.x, sz = V.z + t * W.z;
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if(t >= 0.&&abs(sx)<1.5 && abs(sz+.6)<3.)
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{
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vec3 S = vec3(sx, -.2, sz);
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vec3 realLDir=normalize(LDir - S);
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color=(
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0.5 //ambient for ground
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+0.5*max(0.,realLDir.y)*LCol //diffusion for ground
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)*groundColor
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;
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// + SPECULAR COMPONENT GOES HERE
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if(rtxoff || j == n_ref - 1)
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{
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color += sqrt(float(j+1))*groundSpecular.xyz* //specular for ground.
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pow(max(0., dot(vec3(-realLDir.x, realLDir.y,-realLDir.z),-W)),groundSpecular.w);
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//stack[j] = RT(color, currentK); //ks of ground is 0.15
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scolor += currentK * color;
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}
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else
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{
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lastRay[2 * j + 1] = Ray(S, vec3(W.x, -W.y, W.z), currKf, currentK * 0.15); //reflection
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//stack[j] = RT(color, currentK * (1.-0.15)); //ks of ground is 0.15
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scolor += (currentK*.85)*color;
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}
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//lastRay[2 * j + 2] = Ray(S, vec3(0,0,0), 0.); //refraction
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}
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else{
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if(j > 0)
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{
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// If the light bounces away! The color of it is calculated by
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//stack[j] = RT(sqrt(float(j+1))*vec3(4.,4.,4)*pow(max(0.,dot(W, normalize(LDir - V))), 10.), currentK);
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scolor += currentK * sqrt(float(j+1)*pow(max(0.,dot(W, normalize(LDir - V))), 10.)) * vec3(4.,4.,4);
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//cnt_ref = j + 1;
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}
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//else //If the light hits the void in the first place, it's just black!
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//cnt_ref = j;//j is always 0 in this case.
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break; //The light is shooting into the void, let's stop RT.
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}
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}
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if(rtxoff)
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break;
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}
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if(!rtxoff)
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{
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color = scolor;
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// color = vec3(0,0,0);
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// //float currks = 1.;
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// for(int i = 0; i < n_ref; ++i)
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// {
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// //if(i >= cnt_ref)//same trick to use bounded non-const on indexes
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// // {
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// // color += currks * stack[i - 1].color; //if there're less than n_ref rays, e.g. ray go to the void.
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// // break;
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// // }
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// if(stack[i].ks <0.0000001)
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// continue;
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// color += stack[i].ks * stack[i].color;//currks *(1.-stack[i].ks) * stack[i].color;
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// //currks *= stack[i].ks;
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// }
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// // if(n_ref == cnt_ref)
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// // color += currks * stack[n_ref - 1].color;
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}
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gl_FragColor=vec4(sqrt(color),1.);
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}
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