precision highp float; uniform vec2 resolution; uniform float time; uniform vec2 mouse; uniform sampler2D backbuffer; #define PI acos(-1.0) mat2 rot(vec2 p, float a){ float c = cos(a), s = sin(a); return mat2(c,s,-s,c); } float sdPlane(vec3 p, vec3 n){ return dot(p, n); } float sdBox(vec3 p, vec3 s){ vec3 d = abs(p) - s; return length(max(d,0.0)) + min(max(d.x,max(d.y,d.z)),0.0); } float sdBoxInf(vec3 p, vec2 s){ vec2 d = abs(p.xz) - s; return length(max(d,0.0)) + min(max(d.x, d.y),0.0); } float hash(float n){ return fract(43531.531 * sin(n * 1413.5)); } float hash(vec2 p){ return fract(43531.531 * sin(dot(p, vec2(14.5,34.53)))); } float hash(vec3 p){ return fract(43531.531 * sin(dot(p, vec3(14.5,34.53,67.43)))); } float noise(float n){ float f = fract(n); float a0 = floor(n); float a1 = floor(n + 1.0); float u = f * f * (3.0 - 2.0 * f); return mix(a0,a1,u); } vec2 rp(float n){ return vec2(hash(n),hash(n + 12.6436)); } vec3 tex(vec2 uv){ vec3 c = vec3(1.0); uv.x += time * 5.0; uv *= vec2(0.05,2.0); vec2 fuv = fract(uv); vec2 iuv = floor(uv); float h = hash(iuv); c = h > 0.5 ? vec3(1) : vec3(0.5); // c = vec3(0.0); return c; } vec4 map(vec3 p){ float t = time * 2.0; float it = floor(t); float ft = fract(t); float t0 = it + pow(ft,8.0); vec3 pbg = p; vec3 pp = p; p.xz *= rot(p.xz, -t * 0.1); vec3 p0 = p; p0.xz *= rot(p0.xz,t0 * 3.0); p0.xz *= rot(p0.xz, p.y * 0.21 + 0.7); float c = 1.0; for(int i = 0; i < 6; i++){ vec2 rpos = rp(float(i)) * 0.5 - 0.5; rpos *= 9.0; vec3 pl = p0; pl.xz *= rot(pl.xz, p.y * 0.21 + PI + float(i) * 0.4); pl.xz += rpos; float b = sdBoxInf(pl,vec2(0.25)); c = min(c,b); } vec3 p1 = p; p1.xz *= rot(p1.xz,t0 * 4.0); for(int i = 0; i < 8; i++){ vec2 rpos = rp(float(i)) * 0.5 - 0.5; rpos *= 3.0; vec3 pl = p1; pl.xz *= rot(pl.xz, p.y * 0.21 + PI + float(i) * 0.4); pl.xz += rpos; pl.x += noise(pl.y * 0.25) * 0.5; float b = sdBoxInf(pl,vec2(0.25)); c = min(c,b); } vec4 lc = vec4(1,1,1.1,c); pbg.x = abs(pbg.x); float bgb = sdPlane(-30.0 + pbg, vec3(-1,0,0)); float bg = 1.0; bg = min(bg, bgb); vec4 bgc = vec4(tex(pbg.yz),bg); lc = lc.a < bg ? lc : bgc; pp.y += t * 100.0; vec3 fp = mod(pp,5.0) - 2.5; vec3 ip = floor(pp/5.0); float pb = sdBox(fp, vec3(0.025,5,0.025)); float h = hash(ip); pb = h > 0.05 ? 1.0 : pb; lc = lc.a < pb ? lc : vec4(2,2,2,pb); return lc; } vec3 normal(vec3 p){ vec2 d = vec2(0.001,0.0); return normalize(vec3(map(p + d.xyy).a - map(p - d.xyy).a, map(p + d.yxy).a - map(p - d.yxy).a, map(p + d.yyx).a - map(p - d.yyx).a)); } vec4 trace(vec3 o, vec3 d){ vec3 p = o; vec4 c = vec4(0.0); float t; for(int i = 0; i < 99; i++){ t = map(p).a; if(t < 0.0001) break; p += t * d; } if(t < 0.0001){ c.rgb = map(p).rgb; vec3 n = normal(p); vec3 dir = normalize(p); float ndl = dot(n,dir); c.rgb *= ndl * ndl; vec3 rd = reflect(d, n); vec3 rp = p + n * 0.001; float s = 0.0; for(int j = 0; j < 99; j++){ s = map(rp).a; if(s < 0.0001 || s > 100.0)break; rp += s * rd; } if(s < 0.0001){ c.rgb *= map(rp).rgb * 0.5; } } c = clamp(c,0.0,1.0); float l = length(p - o); c = mix(c, vec4(0.7),clamp(l/150.0,0.0,1.0)); return c; } void main(void) { vec2 uv = vec2(gl_FragCoord.x / resolution.x, gl_FragCoord.y / resolution.y); uv -= 0.5; vec2 preUv = uv + 0.5; uv /= vec2(resolution.y / resolution.x, 1); vec3 p = vec3(uv,1.0); vec3 cpos = vec3(0,0,-10.0); float t = time; cpos.xz *= rot(cpos.xz, t * 0.1); vec3 cup = normalize(vec3(0,1,0.0)); cup.xy *= rot(cup.xy, t * 0.3); vec3 cdir = normalize(vec3(0,0,1)); cdir.xz *= rot(cdir.xz, t * 0.1); vec3 cside = cross(cup,cdir); vec3 dir = p.x * cside + p.y * cup + cdir * p.z; dir = normalize(dir); vec4 c = trace(cpos, dir); vec4 pre = texture2D(backbuffer , preUv); c.rgb = mix(c.rgb, pre. rgb,0.3); c.rgb = pow(c.rgb,vec3(1.0,0.9,0.8)); gl_FragColor = vec4(c.rgb,1); }

0909 おさんぽ会