precision highp float; uniform vec2 resolution; uniform float time; uniform vec2 mouse; uniform sampler2D backbuffer; float pi = acos(-1.); mat2 rot(float a){return mat2(cos(a),sin(a),-sin(a),cos(a));} vec2 pmod(vec2 p, float r){float a = atan(p.x,p.y)+pi/r;float n = (pi*2.)/r;return p*rot(-(floor(a/n)*n));} //https://neort.io/art/bpu6m8c3p9fefb925910?index=182&origin=my_profile vec2 random2(vec2 st){ st = vec2( dot(st,vec2(127.1,311.7)), dot(st,vec2(269.5,183.3)) ); return -1.0 + 2.0*fract(sin(st)*43758.5453123); } float noise(vec2 st) { vec2 p = floor(st); vec2 f = fract(st); vec2 u = f*f*(3.0-2.0*f); vec2 v00 = random2(p+vec2(0,0)); vec2 v10 = random2(p+vec2(1,0)); vec2 v01 = random2(p+vec2(0,1)); vec2 v11 = random2(p+vec2(1,1)); return mix( mix( dot( v00, f - vec2(0,0) ), dot( v10, f - vec2(1,0) ), u.x ), mix( dot( v01, f - vec2(0,1) ), dot( v11, f - vec2(1,1) ), u.x ), u.y)+0.5; } float fbm (vec2 st) { float f = 0.; vec2 q = st/2.; for(int i = 0 ;i < 2;i++){ f += noise(q)/pow(2.,float(i)); q = q * (2.00+float(i)/100.); } return f; } //----------------------------------------------------- vec2 smoothpmod(vec2 p, float r,float e) { float a = atan(p.x,p.y)+pi/r; float n = (pi*2.)/r; float angle = floor(a/n)*n; float x = a/n * n; x = a/n; angle = floor(x) + pow(fract(x),e); vec2 rp = p * rot(-( angle * n )); //rp.x = sin(a * pi); return rp; } //https://iquilezles.org/articles/smin/ float sminCubic( float a, float b, float k ) { float h = max( k-abs(a-b), 0.0 )/k; return min( a, b ) - h*h*h*k*(1.0/6.0); } vec2 sminCubic2( float a, float b, float k ) { float h = max( k-abs(a-b), 0.0 )/k; float m = h*h*h*0.5; float s = m*k*(1.0/3.0); return (a 150.)break; depth += d.x; } return vec2(-depth); } float rand(vec3 p) { p = fract( p*0.3183099+.1 ); p *= 17.0; return fract( p.x*p.y*p.z*(p.x+p.y+p.z) ); } float noise(vec3 p) { vec3 fp = floor(p); vec3 fs = fract(p); vec3 sf = vec3(1.,0.,0.); float a = rand(fp); float b = rand(fp + sf); float c = rand(fp + sf.yxz); float d = rand(fp + sf.xxz); float e = rand(fp + sf.yyx); float f = rand(fp + sf.xyx); float g = rand(fp + sf.yxx); float h = rand(fp + sf.xxx); vec3 u = smoothstep(0.,1.,fs); // u = pow(fs,vec3(3.)); return mix(mix( mix(a,b,u.x), mix(c,d,u.x),u.y), mix( mix(e,f,u.x), mix(g,h,u.x),u.y),u.z ); } float fbm(vec3 p) { float v = 0.; float a = .5; float f = 0.; for(int i=0;i<3;i++) { v+=a*noise(p); p*=2.; a*=.5; } return v; } vec3 skyColor(vec3 rd,vec3 sun,float starToggle,float sunToggle) { vec3 sky = rd; rd.y = abs(rd.y); vec3 sunPos = sun; sky = vec3(0.); float ld = dot(sun,vec3(0.,1.,0.)); float sd = abs( dot(sun,vec3(0.,0.,1.)) ); vec3 rd2 = rd; rd2.xz *= rot(time/18.); vec3 star = vec3(0.,0.5,1.) + sin( rand(rd2 * 10.)*10. ); star *= step(fbm(rd2*500.), 0.2); star *= (sin(time*1. + fbm(rd2*150.)*30. ) + 1.)/2.; star = clamp( star - .05,vec3(0.),vec3(1.)) * starToggle; sky += vec3(0.,0.1,.2); sky += vec3(0.4,0.35,0.75) * ld; sky += max(0.,pow((1. - ld),8.) ) * star; sky += vec3(0.6,0.0,-0.1) * sd; float siz = .1; float srd = clamp(dot(sunPos,rd) - siz,0.,1.) + siz; float s = mix(.3,1.3,ld); srd = pow( srd , 3.) - .7 + pow( srd , 120.); sky += max(0.05 , srd) * sunToggle; //sky += vec3(0.01,0.01,0.01); return sky; } vec3 getMat(vec2 d){ //turquoise blue vec3 o = vec3(0.,175.,204.)/255.; if(d.y == GROUND) { o = vec3(.9,0.67,0.)/1.35; }else if(d.y == CAMEL){ o *= 1.012; }else if(d.y == CASTLE){ o = vec3(1.); } return o; } void main(void) { vec2 p = (gl_FragCoord.xy * 2.0 - resolution.xy) / min(resolution.x, resolution.y); vec3 cp = vec3(17.,-17.,-90.); vec3 target = vec3(10.,-20.,0.); vec3 col = vec3(0.); vec3 cd = normalize(target - cp); vec3 cs = normalize(cross(cd,vec3(0.,1.,0.))); vec3 cu = normalize(cross(cd , cs)); float fov = 1.5 - dot(p,p)/3.; vec3 rd = normalize(p.x * cs + p.y * cu + cd * fov); vec3 sun = normalize(vec3(0.5,8.,8.)); sun.yz *= rot(time/2.); vec3 sky = skyColor(rd,sun,1.,1.); col = vec3(0.9,0.9,1.); col = sky; vec3 bg = col; vec2 d = march(cp , rd); if(d.x > 0.) { vec2 e = vec2(-1.,1.) * .05; vec3 pos = cp + rd * d.x; vec3 N = normalize( e.xyy * map(pos + e.xyy).x + e.yyx * map(pos + e.yyx).x + e.yxy * map(pos + e.yxy).x + e.xxx * map(pos + e.xxx).x); col = N; col = getMat(d); // sun.xz *= rot(time); float odiff = max(0.,dot(sun,N)); float diff = max(0.,dot(-sun,N)); float daynight = mix(1.,0.,max(0.,dot(sun,vec3(0.,-1.,0.)))); diff *= daynight; float rim = pow(clamp(1. - dot(N, -rd), 0., 1.), 3.); //rim = 0.; float sp = 0.; if(d.y != CAMEL){ diff = pow(diff , 2.); sp = max(0.,dot(rd,reflect(N,sun))); sp = pow(sp,3.); rim = pow(clamp(1. - dot(N, -rd), 0., 1.), 63.); // rim = 1. - rim; } col = col * diff + sp + rim * col; if(d.y == CAMEL) { col = getMat(d); } float t = 1. - exp(-.0001 * d.x * d.x ); bg = skyColor(rd,sun,0.,0.); col = mix(col,bg,t); col = mix(vec3(0.001,0.031,0.2) * pow(odiff,3.),col,daynight); //col = rim * vec3(0.,0.7,0.7) /3.; } gl_FragColor = vec4(col, 1.0); }