precision highp float; uniform vec2 resolution; uniform float time; uniform vec2 mouse; uniform sampler2D backbuffer; #define COLOR_N vec3(0.15, 0.34, 0.6) #define COLOR_T vec3(0.313, 0.816, 0.816) #define COLOR_M vec3(0.745, 0.118, 0.243) #define COLOR_K vec3(0.475, 0.404, 0.765) #define COLOR_H vec3(1.0, 0.776, 0.224) #define COLOR_C vec3(0.98, 0.514, 0.2) #define COLOR_KA vec3(0.898, 0.275, 0.11) #define COLOR_CH vec3(0.976, 0.231, 0.565) #define COLOR_JU vec3(1.0, 0.776, 0.008) #define COLOR_RI vec3(0.537, 0.765, 0.922) #define COLOR_NA vec3(0.549, 0.902, 0.404) #define COLOR_S vec3(0.682, 0.706, 0.612) float pi = acos(-1.0); mat2 rotate(float a){ float c = cos(a); float s = sin(a); return mat2(c, -s, s, c); } float random2d(vec2 p){ return fract(sin(dot(p, vec2(12.64524, 94.1241))) * 241222.21414); } float sdStar(vec2 uv, float s){ float pi2 = pi * 2.0; float a = atan(uv.y, uv.x) / pi2; float seg = a * 5.0; a = ((floor(seg)+0.5)/5.0 + mix(s, -s, step(0.5, fract(seg)))) * pi2; return abs(dot(vec2(cos(a), sin(a)), uv)); } vec3 starTextureC(vec2 uv){ vec3 col = vec3(0.0); uv -= vec2(time, -time) * 0.2; uv *= 5.0; vec2 fPos = (fract(uv) - 0.5) * 2.0; vec2 iPos = floor(uv); col += COLOR_C; float rand = random2d(iPos); if(0.0 <= rand && rand < 0.2){ col = mix(col, COLOR_KA, step(sdStar(fPos, 0.31), 0.3)); }else if(0.2 <= rand && rand < 0.4){ col = mix(col, COLOR_CH, step(sdStar(fPos, 0.31), 0.3)); }else if(0.4 <= rand && rand < 0.6){ col = mix(col, COLOR_JU, step(sdStar(fPos, 0.31), 0.3)); }else if(0.6 <= rand && rand < 0.8){ col = mix(col, COLOR_RI, step(sdStar(fPos, 0.31), 0.3)); }else{ col = mix(col, COLOR_NA, step(sdStar(fPos, 0.31), 0.3)); } return col; } vec3 starTextureN(vec2 uv){ vec3 col = vec3(0.0); uv -= vec2(time, time) * 0.2; uv *= 5.0; vec2 fPos = (fract(uv) - 0.5) * 2.0; vec2 iPos = floor(uv); col += COLOR_N; float rand = random2d(iPos); if(0.0 <= rand && rand < 0.25){ col = mix(col, COLOR_T, step(sdStar(fPos, 0.31), 0.3)); }else if(0.25 <= rand && rand < 0.5){ col = mix(col, COLOR_M, step(sdStar(fPos, 0.31), 0.3)); }else if(0.5 <= rand && rand < 0.75){ col = mix(col, COLOR_K, step(sdStar(fPos, 0.31), 0.3)); }else{ col = mix(col, COLOR_H, step(sdStar(fPos, 0.31), 0.3)); } return col; } vec3 renderingFunc(vec2 uv){ vec3 color = vec3(0.0); vec3 starRipple = vec3(step(sin(sdStar(uv * 10.0, 0.1) - time * 4.0), 0.0)); color = mix(starTextureN(uv), starTextureC(uv), starRipple); return color; } void main(){ vec2 uv = (gl_FragCoord.xy * 2.0 - resolution) / min(resolution.x, resolution.y); vec3 color = vec3(0.0); color += renderingFunc(uv); gl_FragColor = vec4(color, 1.0); }