Constant BEND_WGSL
Source pub const BEND_WGSL: &str = "fn pcg(v: u32) -> u32 {\n let s = v * 747796405u + 2891336453u;\n let w = ((s >> ((s >> 28u) + 4u)) ^ s) * 277803737u;\n return (w >> 22u) ^ w;\n}\n\nfn hash3(p: vec3i) -> f32 {\n var h = u32(p.x) * 73856093u ^ u32(p.y) * 19349663u ^ u32(p.z) * 83492791u;\n h = pcg(h);\n return f32(h >> 8u) / 16777216.0;\n}\n\nfn noise3(p: vec3f) -> f32 {\n let i = vec3i(floor(p));\n let f = fract(p);\n let u = f * f * (3.0 - 2.0 * f);\n let a = mix(mix(hash3(i), hash3(i + vec3i(1, 0, 0)), u.x), mix(hash3(i + vec3i(0, 1, 0)), hash3(i + vec3i(1, 1, 0)), u.x), u.y);\n let b = mix(mix(hash3(i + vec3i(0, 0, 1)), hash3(i + vec3i(1, 0, 1)), u.x), mix(hash3(i + vec3i(0, 1, 1)), hash3(i + vec3i(1, 1, 1)), u.x), u.y);\n return mix(a, b, u.z);\n}\n\nfn fbm(p: vec3f) -> f32 {\n var sum = 0.0;\n var amp = 0.55;\n var q = p;\n for (var k = 0; k < 4; k++) {\n sum += noise3(q) * amp;\n q = q * 2.07 + vec3f(1.7, 9.2, 3.1);\n amp *= 0.5;\n }\n return sum;\n}\n\nfn gust_at(p: vec3f, time: f32, seed: f32) -> f32 {\n let envelope = 0.55 + 0.45 * sin(time * 0.21 + 0.4) * sin(time * 0.13 + 1.7);\n let n = fbm(vec3f(p.x * 0.37 + time * 0.05, p.y * 0.37 + 2.0, p.z * 0.37 + seed * 0.13));\n return max(envelope * (0.35 + 0.65 * n), 0.0);\n}\n\nfn bend(p: vec3f, obj: u32, time: f32, strength: f32, direction: vec3f, seed: f32) -> vec3f {\n let h = f32(pcg(obj * 747796405u + 11u) >> 8u) / 16777216.0;\n let reach = 0.4 + 0.6 * smoothstep(0.0, 0.35, length(p.xz - vec2f(0.4, -0.12)));\n let gust = gust_at(p, time, seed);\n let bough = vec3f(sin(time * 0.8 + p.x * 3.0), 0.35 * sin(time * 0.6 + p.x * 2.0), 0.5 * cos(time * 0.7 + p.x * 2.5)) * 0.006;\n let flutter = vec3f(sin(time * 3.1 + h * 37.0), sin(time * 3.7 + h * 21.0), cos(time * 2.9 + h * 29.0)) * 0.0015;\n let local = (bough * reach + flutter) * strength * gust;\n let flat = vec3f(direction.x, 0.0, direction.z);\n let dir = normalize(flat + vec3f(1e-5, 0.0, 0.0));\n let side = vec3f(-dir.z, 0.0, dir.x);\n return vec3f(dir.x * local.x + side.x * local.z, local.y, dir.z * local.x + side.z * local.z);\n}\n";