#ifdef GL_FRAGMENT_PRECISION_HIGH precision highp float; #else precision mediump float; #endif uniform vec2 u_buf; uniform vec2 u_css; uniform float u_n; uniform vec4 u_pool[7]; uniform float u_rot; uniform float u_vmax; vec3 poolColor(float kind, vec2 q, float r){ float g = clamp(length(q - r * vec2(-0.24, -0.32)) / (1.811 * r) / 0.72, 0., 1.); if (kind < 0.5) return mix(vec3(0.753, 0.875, 0.992), vec3(0.863, 0.929, 0.996), g); if (kind < 1.5) return mix(vec3(0.549, 0.722, 0.894), vec3(0.753, 0.875, 0.992), g); if (kind < 2.5) return vec3(1.); return mix(vec3(0.647, 0.592, 0.812), vec3(0.831, 0.804, 0.910), g); } vec4 pm(vec3 c, float a){ return vec4(c * a, a); } vec4 sweep(float a){ vec4 z = vec4(0.); vec4 w55 = pm(vec3(1.), .55); vec4 b38 = pm(vec3(0.549, 0.722, 0.894), .38); vec4 v16 = pm(vec3(0.294, 0.180, 0.620), .16); vec4 w45 = pm(vec3(1.), .45); if (a < 45.) return mix(z, w55, a / 45.); if (a < 110.) return mix(w55, z, (a - 45.) / 65.); if (a < 190.) return mix(z, b38, (a - 110.) / 80.); if (a < 250.) return mix(b38, z, (a - 190.) / 60.); if (a < 290.) return mix(z, v16, (a - 250.) / 40.); if (a < 330.) return mix(v16, w45, (a - 290.) / 40.); return mix(w45, z, (a - 330.) / 30.); } void main(){ vec2 css = vec2(gl_FragCoord.x / u_buf.x * u_css.x, (1. - gl_FragCoord.y / u_buf.y) * u_css.y); vec2 p = css * u_n; vec3 prgb = vec3(0.); float pa = 0.; float asum = 0.; for (int i = 0; i < 7; i++) { vec4 P = u_pool[i]; vec2 q = p - P.xy; float sd = (length(q) - P.z) / u_n; float c = 1. - smoothstep(-41., 41., sd); asum += c; vec3 col = poolColor(P.w, q, P.z); if (P.w > 2.5) { prgb = col * c * prgb + col * c * (1. - pa) + prgb * (1. - c); } else { prgb = col * c + prgb * (1. - c); } pa = c + pa - c * pa; } float T = smoothstep(0.3, 0.6, clamp(asum, 0., 1.)); vec3 u = prgb / max(pa, 1e-4); float lum = dot(u, vec3(0.2126, 0.7152, 0.0722)); u = mix(vec3(lum), u, 1.1); vec3 col = mix(vec3(1.), u, T * 0.7); vec2 d = css - u_css * 0.5; float ang = mod(degrees(atan(d.x, -d.y) - u_rot), 360.); vec4 s = sweep(ang) * clamp((length(d) / u_vmax - 12.) / 26., 0., 1.); gl_FragColor = vec4(col * (1. - s.a) + s.rgb, 1.); }

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