precision highp float; uniform vec2 resolution; uniform float time; uniform vec2 mouse; uniform sampler2D backbuffer; #define BPM(intime,inbpm) intime/60. * inbpm #define TT(x,y) floor(x) - pow(fract(x),y) #define waveBPM(intime , inbpm , y) TT(BPM(intime,inbpm),y) mat2 rot(float a){return mat2(cos(a),sin(a),-sin(a),cos(a));} #define ITERATIONS 2 float deMengerSponge2(vec3 p, vec3 offset, float scale) { vec4 z = vec4(p, 1.0); for (int i = 0; i < ITERATIONS; i++) { z = abs(z); if (z.x < z.y) z.xy = z.yx; //if (z.x < z.z) z.xz = z.zx; if (z.y < z.z) z.yz = z.zy; z *= scale; z.xyz -= offset * (scale - 1.0); if (z.z < -0.5 * offset.z * (scale - 1.0)) z.z += offset.z * (scale - 1.0); } return (length(max(abs(z.xyz) - vec3(1.0, 1.0, 1.0), 0.0))) / z.w; } float de(vec3 p) { return deMengerSponge2(p, vec3(1.0), 3.0); } float wire(vec3 p) { p=abs(p); p-=.7; if(p.x 120.)break; depth += d.x; } return vec2(-depth , 0.); } float shadowmarch(vec3 cp , vec3 rd) { float depth = 0.; for(int i = 0 ; i< 128 ; i++) { vec3 rp = cp + rd * depth; vec2 d = map(rp); if(d.x < 0.01) { return -1.; } if(depth > 10.)break; depth += d.x; } return 1.; } vec3 lightEffect(vec3 N,vec3 rd ,vec3 lightPos, vec3 lightDir,vec3 lightCol,vec3 pos,float shadowToggle) { float lPower = 700.5; vec3 col = vec3(0.); float surfToLight = length(lightPos - pos); vec3 surfToLightDir = normalize(pos - lightPos); float range = clamp(dot(lightDir , surfToLightDir),0.,1. ); //if(range > .5) { float attenuation = 1./pow(surfToLight,2.); float diff = max(0.,dot(N,lightDir) - range) * attenuation * lPower; float shadow = step(shadowmarch(pos + N*.01,lightDir),0.); col += diff * lightCol; float sp = max(0.,dot(rd,reflect(-lightDir,N)) - range) * attenuation; sp = pow(sp,1.5); col += sp * vec3(1.); float rim = pow(clamp(1. - dot(N, -rd), 0., 1.), 1.) * 1. * attenuation; col += rim * diff; col -= shadow * shadowToggle; } return col; } vec3 calculateObstruction(vec3 N,vec3 pos, vec3 lpos, float lrad,float lightStrength, vec3 lightCol,vec3 lightDir,vec3 rd) { vec3 toLight = normalize(lpos-pos); float distToLight = length(lpos-pos); float d, t=lrad*0.1; float obstruction=0.; for(int j=0; j<16; j++) { d = map(pos + t*toLight).x; obstruction = max(0.5+(-d)*distToLight/(2.*lrad*t), obstruction); if(obstruction >= 1.){break;} // If we're stuck, advance by the characteristic // size of an obstructing object t += max(d, lrad*t/distToLight); if(t >= distToLight) break; } obstruction = clamp(obstruction, 0.,1.); float diffuse = max(dot(N, toLight), 0.) /(distToLight*distToLight) *lightStrength; float sp = max(0.,dot(rd,reflect(N,lightDir))); sp = pow(sp,6.6) * 1.; return diffuse * (1. - obstruction) * lightCol; } void main(void) { vec2 p = (gl_FragCoord.xy * 2.0 - resolution.xy) / min(resolution.x, resolution.y); vec3 cp = vec3(1.,-1.,18.); //cp.z += sin(time) * 3.; cp.z += sin(time/6.) * 10.; cp.xz *= rot(time/66.); vec3 target = vec3(0.); vec3 col = vec3(0.); vec3 cd = normalize(vec3(target - cp)); vec3 cs = normalize(cross(cd , vec3(0.,1.,0.))); vec3 cu = normalize(cross(cd,cs)); float fov = 2.5; fov = 1. - dot(p,p); vec3 rd = normalize(cd * fov + cs * p.x + cu * p.y); vec2 d = march(cp,rd); if( d.x > 0.) { vec2 e = vec2(1.0, -1.0) * 1.1; 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); vec3 baseCol = vec3(.7,1.,1.); float lightPower = 190.; float lrad = 15.; vec3 lightDir = normalize(vec3(0.,-1.,1.)); lightDir.xz *= rot(time); vec3 lightCol = vec3(1.,0.,0.); vec3 lightPos = vec3(0.,-1.5,1.3); lightPos.x += sin(time) * 10.; lightPos.z += tan(time/60.) * 10.; lightDir = normalize(vec3(0.) - lightPos); //col = lightEffect(N,rd ,lightPos,lightDir,lightCol,pos,d.y) * baseCol; col = calculateObstruction(N, pos, lightPos, lrad, lightPower, lightCol,lightDir,rd); lightDir = normalize(vec3(1.,-1.,0.)); lightDir.xz *= rot(time / 2.); lightCol = vec3(0.,1.,1.); lightPos = vec3(0.,-1.3,2.); lightPos.z += sin(time/50.) * 3.; lightDir = normalize(pos - lightPos); //col += lightEffect(N,rd ,lightPos,lightDir,lightCol,pos,d.y) * baseCol; col += calculateObstruction(N, pos, lightPos, lrad, lightPower, lightCol,lightDir,rd); lightDir = normalize(vec3(3.,-1.,0.3)); lightDir.yz *= rot(time/10. + 1.3) ; lightCol = vec3(1.,0.,1.); lightPos = vec3(1.,-1.,0.); lightPos.y += sin(time/26.); lightDir = normalize(vec3(0.) - lightPos); //col += lightEffect(N,rd ,lightPos,lightDir,lightCol,pos,d.y) * baseCol; col += calculateObstruction(N, pos, lightPos, lrad, lightPower, lightCol,lightDir,rd); col *= 1.5; //col /= 3.; //col = N; } gl_FragColor = vec4(col, 1.0); }

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