precision highp float; uniform float time; uniform vec2 mouse; uniform vec2 resolution; #define BPM 120.0 const float GRID_SPACING = 5.0; const vec3 WALL_SIZE = vec3(10.0, 5.0, 10.0) * GRID_SPACING + 0.5 * GRID_SPACING; #define LIGHT_BLUE vec3(0.05, 0.3, 1.2) #define LIGHT_ORANGE vec3(1.2, 0.15, 0.05) float timeToBeat(float time) { return time / 60.0 * BPM; } // 1 bar = 4 beat float timeToBar(float time) { return timeToBeat(time * 0.25); } float random(float x){ return fract(sin(x * 12.9898) * 43758.5453); } float random(vec4 x){ return fract(sin(dot(x,vec4(12.9898, 78.233, 39.425, 27.196))) * 43758.5453); } mat2 rotate(float r) { float c = cos(r); float s = sin(r); return mat2(c, s, -s, c); } float usin(float x) { return sin(x) * 0.5 + 0.5; } void setNormalEnvironmentStatus(out vec3 color0, out vec3 color1, out float borderEdge0, out float borderEdge1, out ivec3 lines) { color0 = vec3(0.75); color1 = vec3(0.0, 0.075, 0.185); borderEdge0 = 0.01; borderEdge1 = 0.05; lines = ivec3(1, 1, 1); } void setUnlightedEnvironmentStatus(out vec3 color0, out vec3 color1, out float borderEdge0, out float borderEdge1, out ivec3 lines) { color0 = vec3(0.0); color1 = vec3(0.0); borderEdge0 = 0.0; borderEdge1 = 0.0; lines = ivec3(0, 0, 0); } void setLightBorderEdge(out float borderEdge0, out float borderEdge1) { borderEdge0 = 0.0; borderEdge1 = 0.1; } void setEnvironmentStatus(vec3 pos, int hit, out vec3 color0, out vec3 color1, out float borderEdge0, out float borderEdge1, out ivec3 lines) { float beat = timeToBeat(time); beat = mod(beat, 32.0); float bar = timeToBar(time); if (beat < 8.0) { if (beat < 7.0) { setNormalEnvironmentStatus(color0, color1, borderEdge0, borderEdge1, lines); return; } else { float r = random(ceil(fract(beat) * 20.0) / 20.0); if (r > fract(beat)) { setNormalEnvironmentStatus(color0, color1, borderEdge0, borderEdge1, lines); return; } else { setUnlightedEnvironmentStatus(color0, color1, borderEdge0, borderEdge1, lines); return; } } } else if (beat < 16.0) { if (hit == 0 || hit == 2) { color0 = vec3(0.0); color1 = mix(LIGHT_ORANGE, LIGHT_BLUE, usin(pos.y * 0.05 + time * 10.0)); setLightBorderEdge(borderEdge0, borderEdge1); lines = ivec3(0, 1, 0); return; } else { setUnlightedEnvironmentStatus(color0, color1, borderEdge0, borderEdge1, lines); return; } } else if (beat < 24.0) { if (hit == 0 || hit == 1) { color0 = vec3(0.0); float end0 = WALL_SIZE.z - max(fract(bar) * 2.0 - 1.0, 0.0) * 2.0 * WALL_SIZE.z; float end1 = WALL_SIZE.z - min(fract(bar) * 2.0, 1.0) * 2.0 * WALL_SIZE.z; color1 = mix(LIGHT_ORANGE, LIGHT_BLUE, smoothstep(-WALL_SIZE.z, WALL_SIZE.z, pos.z)); color1 = mix(vec3(0.0), color1, (1.0 - step(end0, pos.z)) * step(end1, pos.z)); setLightBorderEdge(borderEdge0, borderEdge1); lines = ivec3(0, 0, 1); return; } else { setUnlightedEnvironmentStatus(color0, color1, borderEdge0, borderEdge1, lines); return; } } else if (beat < 32.0) { if (beat < 31.0) { color0 = vec3(0.0); color1 = mix(LIGHT_ORANGE, LIGHT_BLUE, usin(pos.y * 0.05 - time * 8.0)); setLightBorderEdge(borderEdge0, borderEdge1); lines = ivec3(1, 1, 1); return; } else { float r = random(ceil(fract(beat) * 20.0) / 20.0); if (r < fract(beat)) { setNormalEnvironmentStatus(color0, color1, borderEdge0, borderEdge1, lines); return; } else { setUnlightedEnvironmentStatus(color0, color1, borderEdge0, borderEdge1, lines); return; } } } } vec3 environment(vec3 ro, vec3 rd) { float t = 1e6; int hit = 0; for (int i = 0; i < 3; i++) { if (rd[i] != 0.0) { float tn = (-WALL_SIZE[i] - ro[i]) / rd[i]; if (tn > 0.0 && tn < t) { t = tn; hit = i; } float tp = (WALL_SIZE[i] - ro[i]) / rd[i]; if (tp > 0.0 && tp < t) { t = tp; hit = i; } } } if (t == 1e6) { return vec3(0.0); } vec3 p = ro + t * rd; vec3 color0, color1; float borderEdge0, borderEdge1; // 0 <= borderEdge0 <= birderEdge1 <= 0.5 ivec3 lines; setEnvironmentStatus(p, hit, color0, color1, borderEdge0, borderEdge1, lines); float v = 0.0; for (int i = 0; i < 3; i++) { if (lines[i] == 1) { v = max(v, smoothstep(borderEdge1, borderEdge0, 0.5 - abs(fract(p[i] / GRID_SPACING) - 0.5))); } } return mix(color0, color1, v); } float smoothUnion(float d1, float d2, float k) { float h = clamp(0.5 + 0.5 * (d2 - d1) / k, 0.0, 1.0); return mix(d2, d1, h) - k * h * (1.0 - h); } float random(float x, inout float seed) { seed += 0.1; return random(x + seed); } float map(vec3 p) { float d = 1e6; float seed = 0.0; for (float i = 1.0; i <=5.0; i += 1.0) { vec3 c = vec3(20.0 * sin(time + 100.0 * random(i, seed)), 0.0, 0.0); c.xy *= rotate(time * random(i, seed) + 100.0 * random(i, seed)); c.xz *= rotate(time * random(i, seed) + 100.0 * random(i, seed)); float r = mix(1.0, 10.0, smoothstep(0.0, 1.0, random(i, seed))); d = smoothUnion(d, length(p - c) - r, 6.0); } return d; } vec3 calcNormal(vec3 p) { float d = 0.01; return normalize(vec3( map(p + vec3(d, 0.0, 0.0)) - map(p - vec3(d, 0.0, 0.0)), map(p + vec3(0.0, d, 0.0)) - map(p - vec3(0.0, d, 0.0)), map(p + vec3(0.0, 0.0, d)) - map(p - vec3(0.0, 0.0, d)) )); } vec3 schlickFresnel(vec3 f90, float cosine) { return f90 + (1.0 - f90) * pow(1.0 - cosine, 5.0); } vec3 raymarch(vec3 ro, vec3 rd) { vec3 p = ro; for (int i = 0; i < 24; i++) { float d = map(p); p += d * rd; if (d < 0.5) { vec3 n = calcNormal(p); vec3 reflectDir = reflect(rd, n); float dotNR = max(0.0, dot(n, reflectDir)); vec3 specColor = vec3(0.001); vec3 fresnel = schlickFresnel(specColor, dotNR); return fresnel * environment(p, reflectDir); } } return environment(ro, rd); } void main(void) { vec2 st = (2.0 * gl_FragCoord.xy - resolution) / min(resolution.x, resolution.y); vec3 ro = vec3(20.0, -10.0, 38.0); vec3 ta = vec3(0.0); vec3 z = normalize(ta - ro); vec3 up = vec3(0.0, 1.0, 0.0); vec3 x = normalize(cross(z, up)); vec3 y = normalize(cross(x, z)); vec3 rd = normalize(x * st.x + y * st.y + z * 1.5); vec3 c = raymarch(ro, rd); gl_FragColor = vec4(pow(c, vec3(1.0 / 2.2)), 1.0); }

metaball in room