precision highp float; // Created by Danil (2021+) https://twitter.com/AruGL // License Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License. // this is GLES2 port of my own shader, original // https://www.shadertoy.com/view/NslGRN uniform vec2 resolution; uniform float time; uniform vec2 mouse; uniform sampler2D backbuffer; uniform sampler2D channel0; uniform vec2 channelSize0; // uncomment for Animation 1 //#define ANIM // reflect back side //#define backside_refl // #define tshift 53. #define curvature 0.5 // uncomment for Animation 2 //#define curvature (0.001+1.5-1.5*smoothstep(0.,8.5,mod((iTime+tshift)*0.44,20.))*(1.-smoothstep(10.,18.5,mod((iTime+tshift)*0.44,20.)))) #define FDIST 0.7 #define PI 3.1415926 #define GROUNDSPACING 0.5 #define GROUNDGRID 0.05 #define BOXDIMS vec3(0.75, 0.75, 1.25) #define IOR 1.33 mat3 rotx(float a){float s = sin(a);float c = cos(a);return mat3(vec3(1.0, 0.0, 0.0), vec3(0.0, c, s), vec3(0.0, -s, c)); } mat3 roty(float a){float s = sin(a);float c = cos(a);return mat3(vec3(c, 0.0, s), vec3(0.0, 1.0, 0.0), vec3(-s, 0.0, c));} mat3 rotz(float a){float s = sin(a);float c = cos(a);return mat3(vec3(c, s, 0.0), vec3(-s, c, 0.0), vec3(0.0, 0.0, 1.0 ));} vec3 getColor(vec3 p) { // dFd fix, dFd broken on borders, but it fix only top level dFd, self intersection has border if (length(p) > 0.99)return vec3(0.); p = abs(p); p *= 01.25; p = 0.5 * p / dot(p, p); float ot=mod( (0.13) * length(p),5.); #ifdef ANIM p+=0.2*time; #endif float t = (0.13) * length(p); t=mod(t,0.8); vec3 col = texture2D(channel0,vec2(t,0.5)).rgb; col*=vec3(1.-smoothstep(-0.3,2.25,ot)); return col; } void calcColor(vec3 ro, vec3 rd, vec3 nor, float d, float len, int idx, bool si, float td, out vec4 colx, out vec4 colsi) { vec3 pos = (ro + rd * d); #ifdef DEBUG float a = 1. - smoothstep(len - 0.15, len + 0.00001, length(pos)); if (idx == 0)colx = vec4(1., 0., 0., a); if (idx == 1)colx = vec4(0., 1., 0., a); if (idx == 2)colx = vec4(0., 0., 1., a); if (si) { pos = (ro + rd * td); float ta = 1. - smoothstep(len - 0.15, len + 0.00001, length(pos)); if (idx == 0)colsi = vec4(1., 0., 0., ta); if (idx == 1)colsi = vec4(0., 1., 0., ta); if (idx == 2)colsi = vec4(0., 0., 1., ta); } #else float a = 1. - smoothstep(len - 0.15*0.5, len + 0.00001, length(pos)); //a=1.; vec3 col = getColor(pos); colx = vec4(col, a); if (si) { pos = (ro + rd * td); float ta = 1. - smoothstep(len - 0.15*0.5, len + 0.00001, length(pos)); //ta=1.; col = getColor(pos); colsi = vec4(col, ta); } #endif } // xSI is self intersect data, fade to fix dFd on edges bool iBilinearPatch(in vec3 ro, in vec3 rd, in vec4 ps, in vec4 ph, in float sz, out float t, out vec3 norm, out bool si, out float tsi, out vec3 normsi, out float fade, out float fadesi) { vec3 va = vec3(0.0, 0.0, ph.x + ph.w - ph.y - ph.z); vec3 vb = vec3(0.0, ps.w - ps.y, ph.z - ph.x); vec3 vc = vec3(ps.z - ps.x, 0.0, ph.y - ph.x); vec3 vd = vec3(ps.xy, ph.x); t = -1.; tsi = -1.; si = false; float tmp = 1.0 / (vb.y * vc.x); float a = 0.0; float b = 0.0; float c = 0.0; float d = va.z * tmp; float e = 0.0; float f = 0.0; float g = (vc.z * vb.y - vd.y * va.z) * tmp; float h = (vb.z * vc.x - va.z * vd.x) * tmp; float i = -1.0; float j = (vd.x * vd.y * va.z + vd.z * vb.y * vc.x) * tmp - (vd.y * vb.z * vc.x + vd.x * vc.z * vb.y) * tmp; float p = dot(vec3(a, b, c), rd.xzy * rd.xzy) + dot(vec3(d, e, f), rd.xzy * rd.zyx); float q = dot(vec3(2.0, 2.0, 2.0) * ro.xzy * rd.xyz, vec3(a, b, c)) + dot(ro.xzz * rd.zxy, vec3(d, d, e)) + dot(ro.yyx * rd.zxy, vec3(e, f, f)) + dot(vec3(g, h, i), rd.xzy); float r = dot(vec3(a, b, c), ro.xzy * ro.xzy) + dot(vec3(d, e, f), ro.xzy * ro.zyx) + dot(vec3(g, h, i), ro.xzy) + j; if (abs(p) < 0.000001) { float tt = -r / q; if (tt <= 0.) return false; t = tt; // normal vec3 pos = ro + t * rd; vec3 grad = vec3(2.0) * pos.xzy * vec3(a, b, c) + pos.zxz * vec3(d, d, e) + pos.yyx * vec3(f, e, f) + vec3(g, h, i); norm = -normalize(grad); return true; } else { float sq = q * q - 4.0 * p * r; if (sq < 0.0) { return false; } else { float s = sqrt(sq); float t0 = (-q + s) / (2.0 * p); float t1 = (-q - s) / (2.0 * p); float tt1 = min(t0 < 0.0 ? t1 : t0, t1 < 0.0 ? t0 : t1); float tt2 = max(t0 > 0.0 ? t1 : t0, t1 > 0.0 ? t0 : t1); float tt0 = tt1; if (tt0 <= 0.) return false; vec3 pos = ro + tt0 * rd; // black border on end of circle and self intersection with alpha come because dFd // uncomment this to see or rename fcos2 to fcos //sz+=0.3; bool ru = step(sz, length(pos)) > 0.5; if (ru) { tt0 = tt2; pos = ro + tt0 * rd; } if (tt0 <= 0.) return false; bool ru2 = step(sz, length(pos)) > 0.5; if (ru2) return false; // self intersect if ((tt2 > 0.) && ((!ru)) && !(step(sz, length(ro + tt2 * rd)) > 0.5)) { si = true; fadesi=s; tsi = tt2; vec3 tpos = ro + tsi * rd; // normal vec3 tgrad = vec3(2.0) * tpos.xzy * vec3(a, b, c) + tpos.zxz * vec3(d, d, e) + tpos.yyx * vec3(f, e, f) + vec3(g, h, i); normsi = -normalize(tgrad); } fade=s; t = tt0; // normal vec3 grad = vec3(2.0) * pos.xzy * vec3(a, b, c) + pos.zxz * vec3(d, d, e) + pos.yyx * vec3(f, e, f) + vec3(g, h, i); norm = -normalize(grad); return true; } } } float dot2( in vec3 v ) { return dot(v,v); } float segShadow( in vec3 ro, in vec3 rd, in vec3 pa, float sh ) { float dm = dot(rd.yz,rd.yz); float k1 = (ro.x-pa.x)*dm; float k2 = (ro.x+pa.x)*dm; vec2 k5 = (ro.yz+pa.yz)*dm; float k3 = dot(ro.yz+pa.yz,rd.yz); vec2 k4 = (pa.yz+pa.yz)*rd.yz; vec2 k6 = (pa.yz+pa.yz)*dm; { vec2 s = vec2(0.,0); float t = dot(s,k4) - k3; if( t>0.0 ) sh = min(sh,dot2(vec3(clamp(-rd.x*t,k1,k2),k5-k6*s)+rd*t)/(t*t)); } { vec2 s = vec2(1.,0); float t = dot(s,k4) - k3; if( t>0.0 ) sh = min(sh,dot2(vec3(clamp(-rd.x*t,k1,k2),k5-k6*s)+rd*t)/(t*t)); } { vec2 s = vec2(0.,1); float t = dot(s,k4) - k3; if( t>0.0 ) sh = min(sh,dot2(vec3(clamp(-rd.x*t,k1,k2),k5-k6*s)+rd*t)/(t*t)); } { vec2 s = vec2(1.,1); float t = dot(s,k4) - k3; if( t>0.0 ) sh = min(sh,dot2(vec3(clamp(-rd.x*t,k1,k2),k5-k6*s)+rd*t)/(t*t)); } return sh; } float boxSoftShadow( in vec3 ro, in vec3 rd, in vec3 rad, in float sk ) { vec3 rdd = rd; vec3 roo = ro; vec3 m = 1.0/rdd; vec3 n = m*roo; vec3 k = abs(m)*rad; vec3 t1 = -n - k; vec3 t2 = -n + k; float tN = max( max( t1.x, t1.y ), t1.z ); float tF = min( min( t2.x, t2.y ), t2.z ); if( tN0.0) return 0.0; float sh = 1.0; sh = segShadow( roo.xyz, rdd.xyz, rad.xyz, sh ); sh = segShadow( roo.yzx, rdd.yzx, rad.yzx, sh ); sh = segShadow( roo.zxy, rdd.zxy, rad.zxy, sh ); sh = clamp(sk*sqrt(sh),0.0,1.0); return sh*sh*(3.0-2.0*sh); } float box(in vec3 ro, in vec3 rd, in vec3 r, out vec3 nn, bool entering) { vec3 dr = 1.0 / rd; vec3 n = ro * dr; vec3 k = r * abs(dr); vec3 pin = -k - n; vec3 pout = k - n; float tin = max(pin.x, max(pin.y, pin.z)); float tout = min(pout.x, min(pout.y, pout.z)); if (tin > tout) return -1.; if (entering) { nn = -sign(rd) * step(pin.zxy, pin.xyz) * step(pin.yzx, pin.xyz); } else { nn = sign(rd) * step(pout.xyz, pout.zxy) * step(pout.xyz, pout.yzx); } return entering ? tin : tout; } vec3 bgcol(in vec3 rd) { return mix(vec3(0.01), vec3(0.336, 0.458, .668), 1. - pow(abs(rd.z+0.25), 1.3)); } vec3 background(in vec3 ro, in vec3 rd , vec3 l_dir) { float t = (-BOXDIMS.z - ro.z) / rd.z; vec3 bgc = bgcol(rd); if (t < 0.) return bgc; vec2 uv = ro.xy + t * rd.xy; float shad = boxSoftShadow((ro + t * rd), normalize(l_dir+vec3(0.,0.,1.))*rotz(PI*0.65) , BOXDIMS, 1.5); float aofac = smoothstep(-0.95, .75, length(abs(uv) - min(abs(uv), vec2(0.45)))); aofac = min(aofac,smoothstep(-0.65, 1., shad)); float lght=max(dot(normalize(ro + t * rd+vec3(0.,-0.,-5.)), normalize(l_dir-vec3(0.,0.,1.))*rotz(PI*0.65)), 0.0); vec3 col = mix(vec3(0.4), vec3(.71,.772,0.895), lght*lght* aofac+ 0.05) * aofac; return mix(col*length(col)*0.8,bgc,smoothstep(7.,10.,length(uv))); } #define swap(a,b) tv=a;a=b;b=tv // emulating arrays // if(i) b c d to a equal to a=bcd[i] #define ifibcda(i,b,c,d,a) {if(i==0){a=b;}else{if(i==1){a=c;}else if(i==2){a=d;}}} // if(i) a to b c d equal to bcd[i]=a #define ifiabcd(i,a,b,c,d) {if(i==0){b=a;}else{if(i==1){c=a;}else if(i==2){d=a;}}} vec4 insides(vec3 ro, vec3 rd, vec3 nor_c, vec3 l_dir, out float tout, vec4 ps, vec4 ph, float bil_size) { tout = -1.; vec3 trd=rd; vec3 col = vec3(0.); float pi = 3.1415926; if (abs(nor_c.x) > 0.5) { rd = rd.xzy * nor_c.x; ro = ro.xzy * nor_c.x; } else if (abs(nor_c.z) > 0.5) { l_dir *= roty(pi); rd = rd.yxz * nor_c.z; ro = ro.yxz * nor_c.z; } else if (abs(nor_c.y) > 0.5) { l_dir *= rotz(-pi * 0.5); rd = rd * nor_c.y; ro = ro * nor_c.y; } vec3 dx0=vec3(-1.);vec3 dx1=vec3(-1.);vec3 dx2=vec3(-1.); vec4 colx0=vec4(0.);vec4 colx1=vec4(0.);vec4 colx2=vec4(0.); vec4 colxsi0=vec4(0.);vec4 colxsi1=vec4(0.);vec4 colxsi2=vec4(0.); int order0=0;int order1=1;int order2=2; for (int i = 0; i < 3 ; i++) { if (abs(nor_c.x) > 0.5) { ro *= rotz(-pi * (1. / float(3))); rd *= rotz(-pi * (1. / float(3))); } else if (abs(nor_c.z) > 0.5) { ro *= rotz(pi * (1. / float(3))); rd *= rotz(pi * (1. / float(3))); } else if (abs(nor_c.y) > 0.5) { ro *= rotx(pi * (1. / float(3))); rd *= rotx(pi * (1. / float(3))); } vec3 normnew; float tnew; bool si; float tsi; vec3 normsi; float fade; float fadesi; if (iBilinearPatch(ro, rd, ps, ph, bil_size, tnew, normnew, si, tsi, normsi, fade, fadesi)) { if (tnew > 0.) { vec4 tcol, tcolsi; calcColor(ro, rd, normnew, tnew, bil_size, i, si, tsi, tcol, tcolsi); if (tcol.a > 0.0) { { vec3 tvalx = vec3(tnew, float(si), tsi); ifiabcd(i, tvalx, dx0, dx1, dx2); } float dif = clamp(dot(normnew, l_dir), 0.0, 1.0); float amb = clamp(0.5 + 0.5 * dot(normnew, l_dir), 0.0, 1.0); { vec3 shad = vec3(0.32, 0.43, 0.54) * amb + vec3(1.0, 0.9, 0.7) * dif; float ta = clamp(length(tcol.rgb),0.,1.); tcol=clamp(tcol*tcol*2.,0.,1.); vec4 tvalx = vec4((tcol.rgb*shad*1.4 + 3.*(vec3(1.,0.21,0.11)*tcol.rgb)*clamp(1.-(amb+dif),0.,1.)), min(tcol.a,ta)); tvalx.rgb=clamp(2.*tvalx.rgb*tvalx.rgb,0.,1.); tvalx*=(min(fade*5.,1.)); ifiabcd(i, tvalx, colx0, colx1, colx2); } if (si) { dif = clamp(dot(normsi, l_dir), 0.0, 1.0); amb = clamp(0.5 + 0.5 * dot(normsi, l_dir), 0.0, 1.0); { vec3 shad = vec3(0.32, 0.43, 0.54) * amb + vec3(1.0, 0.9, 0.7) * dif; float ta = clamp(length(tcolsi.rgb),0.,1.); tcolsi=clamp(tcolsi*tcolsi*2.,0.,1.); vec4 tvalx = vec4(tcolsi.rgb * shad + 3.*(vec3(1.,0.21,0.11)*tcolsi.rgb)*clamp(1.-(amb+dif),0.,1.), min(tcolsi.a,ta)); tvalx.rgb=clamp(2.*tvalx.rgb*tvalx.rgb,0.,1.); tvalx.rgb*=(min(fadesi*5.,1.)); ifiabcd(i, tvalx, colxsi0, colxsi1, colxsi2); } } } } } } // transparency logic and layers sorting float a = 1.; if (dx0.x < dx1.x){{vec3 swap(dx0, dx1);}{int swap(order0, order1);}} if (dx1.x < dx2.x){{vec3 swap(dx1, dx2);}{int swap(order1, order2);}} if (dx0.x < dx1.x){{vec3 swap(dx0, dx1);}{int swap(order0, order1);}} tout = max(max(dx0.x, dx1.x), dx2.x); if (dx0.y < 0.5) { ifibcda(order0, colx0.a, colx1.a, colx2.a, a); } // self intersection if ((dx0.y > 0.5) && (dx1.x <= 0.)) { vec4 tcolxsi = vec4(0.); ifibcda(order0, colxsi0, colxsi1, colxsi2, tcolxsi); vec4 tcolx = vec4(0.); ifibcda(order0, colx0, colx1, colx2, tcolx); vec4 tvalx = mix(tcolxsi, tcolx, tcolx.a); ifiabcd(order0, tvalx, colx0, colx1, colx2); vec4 tvalx2 = mix(vec4(0.), tvalx, max(tcolx.a, tcolxsi.a)); ifiabcd(order0, tvalx2, colx0, colx1, colx2); } // second layer self intersection if ((dx1.y > 0.5) && (dx0.x > dx1.z)) { vec4 tcolxsi = vec4(0.); ifibcda(order1, colxsi0, colxsi1, colxsi2, tcolxsi); vec4 tcolx = vec4(0.); ifibcda(order1, colx0, colx1, colx2, tcolx); vec4 tvalx = mix(tcolxsi, tcolx, tcolx.a); ifiabcd(order1, tvalx, colx0, colx1, colx2); vec4 tvalx2 = mix(vec4(0.), tvalx, max(tcolx.a, tcolxsi.a)); ifiabcd(order1, tvalx2, colx0, colx1, colx2); } // third layer self intersection if ((dx2.y > 0.5) && (dx1.x > dx2.z)) { vec4 tcolxsi = vec4(0.); ifibcda(order2, colxsi0, colxsi1, colxsi2, tcolxsi); vec4 tcolx = vec4(0.); ifibcda(order2, colx0, colx1, colx2, tcolx); vec4 tvalx = mix(tcolxsi, tcolx, tcolx.a); ifiabcd(order2, tvalx, colx0, colx1, colx2); vec4 tvalx2 = mix(vec4(0.), tvalx, max(tcolx.a, tcolxsi.a)); ifiabcd(order2, tvalx2, colx0, colx1, colx2); } vec4 cbo0 = vec4(0.); vec4 cbo1 = vec4(0.); vec4 cbo2 = vec4(0.); ifibcda(order0, colx0, colx1, colx2, cbo0); ifibcda(order1, colx0, colx1, colx2, cbo1); ifibcda(order2, colx0, colx1, colx2, cbo2); float a1 = (dx1.y < 0.5) ? cbo1.a : ((dx1.z > dx0.x) ? cbo1.a : 1.); float a2 = (dx2.y < 0.5) ? cbo2.a : ((dx2.z > dx1.x) ? cbo2.a : 1.); col = mix(mix(cbo0.rgb, cbo1.rgb, a1), cbo2.rgb, a2); a = max(max(a, a1), a2); return vec4(col, a); } #define ifiabc(i,a,b,c) {if(i==0){b=a;}else{if(i==1){c=a;}}} void mainImage(out vec4 fragColor, in vec2 fragCoord, vec4 iMouse, vec2 iResolution, float iTime) { float osc = 0.5; vec3 l_dir = normalize(vec3(0., 1., 0.)); l_dir *= rotz(0.5); const float bil_size = 1.; vec4 ps = vec4(-bil_size, -bil_size, bil_size, bil_size) * curvature; vec4 ph = vec4(-bil_size, bil_size, bil_size, -bil_size) * curvature; vec2 uv = (fragCoord - 0.5 * iResolution.xy) / iResolution.x; float mouseY = (1.0 - 1.15 * iMouse.y / iResolution.y) * 0.5 * PI; if(iMouse.y < 1.)mouseY = PI*0.49 - smoothstep(0.,8.5,mod((iTime+tshift)*0.33,25.))*(1.-smoothstep(14.,24.0,mod((iTime+tshift)*0.33,25.))) * 0.55 * PI; float mouseX = -(iMouse.x / iResolution.x) * 2. * PI-2.*PI-0.25*(iTime+tshift); vec3 eye = 4. * vec3(cos(mouseX) * cos(mouseY), sin(mouseX) * cos(mouseY), sin(mouseY)); vec3 w = normalize(-eye); vec3 up = vec3(0., 0., 1.); vec3 u = normalize(cross(w, up)); vec3 v = cross(u, w); vec3 rd = normalize(w * FDIST + uv.x * u + uv.y * v); vec3 ni; float t = box(eye, rd, BOXDIMS, ni, true); vec3 ro = eye + t * rd; vec2 coords = ro.xy * ni.z/BOXDIMS.xy + ro.yz * ni.x/BOXDIMS.yz + ro.zx * ni.y/BOXDIMS.zx; float fadeborders = (1.-smoothstep(0.915,1.05,abs(coords.x)))*(1.-smoothstep(0.915,1.05,abs(coords.y))); if (t > 0.) { float ang = -iTime * 0.33; vec3 col = vec3(0.); float R0 = (IOR - 1.) / (IOR + 1.); R0 *= R0; vec2 theta = vec2(0.); vec3 n = vec3(cos(theta.x) * sin(theta.y), sin(theta.x) * sin(theta.y), cos(theta.y)); vec3 nr = n.zxy * ni.x + n.yzx * ni.y + n.xyz * ni.z; vec3 rdr = reflect(rd, nr); vec3 reflcol = background(ro, rdr, l_dir); vec3 rd2 = refract(rd, nr, 1. / IOR); float accum = 1.; vec3 no2 = ni; vec3 ro_refr = ro; vec4 colo0 = vec4(0.); vec4 colo1 = vec4(0.); for (int j = 0; j < 2; j++) { float tb; vec2 coords2 = ro_refr.xy * no2.z + ro_refr.yz * no2.x + ro_refr.zx * no2.y; vec3 eye2 = vec3(coords2, -1.); vec3 rd2trans = rd2.yzx * no2.x + rd2.zxy * no2.y + rd2.xyz * no2.z; rd2trans.z = -rd2trans.z; vec4 internalcol = insides(eye2, rd2trans, no2, l_dir, tb, ps, ph, bil_size); if (tb > 0.) { internalcol.rgb *= accum; ifiabc(j, internalcol, colo0, colo1); } if ((tb <= 0.) || (internalcol.a < 1.)) { float tout = box(ro_refr, rd2, BOXDIMS, no2, false); no2 = n.zyx * no2.x + n.xzy * no2.y + n.yxz * no2.z; vec3 rout = ro_refr + tout * rd2; vec3 rdout = refract(rd2, -no2, IOR); float fresnel2 = R0 + (1. - R0) * pow(1. - dot(rdout, no2), 1.3); rd2 = reflect(rd2, -no2); #ifdef backside_refl if((dot(rdout, no2))>0.5){fresnel2=1.;} #endif ro_refr = rout; ro_refr.z = max(ro_refr.z, -0.999); accum *= fresnel2; } } float fresnel = R0 + (1. - R0) * pow(1. - dot(-rd, nr), 5.); col = mix(mix(colo1.rgb * colo1.a, colo0.rgb, colo0.a)*fadeborders, reflcol, pow(fresnel, 1.5)); col=clamp(col,0.,1.); fragColor = vec4(col, 1.); } else { fragColor = vec4(background(eye, rd, l_dir), 1.); } } void main(void) { vec4 col; mainImage(col, gl_FragCoord.xy,vec4(-1.),resolution.xy,time); gl_FragColor = vec4(col.rgb, 1.0); }

Cube lines