#pragma once // ===== Patternflow pattern ===== // Title: 260713_Firefly // Author: Seunghun LEE // Date: 2026-07-13 // SPDX-License-Identifier: CC-BY-SA-4.0 // =============================== #include #include "config.h" #include "../src/core_display.h" #include "../src/core_encoders.h" #include "../src/core_canvas.h" #include "../src/core_math.h" #include "../src/core_noise.h" namespace FireflyHollow { const char* NAME = "Firefly Hollow"; const char* const KNOB_LABELS[4] = {"Flies", "Speed", "Glow", "Wind"}; // Ramp LUT – DO NOT EDIT (generated from user ramp, 256 entries) static const uint8_t RAMP_LUT[256][3] = { {0,0,0},{0,0,0},{0,0,0},{0,0,0},{0,0,0},{0,0,0},{0,0,0},{0,0,0}, {0,0,0},{0,0,0},{0,0,0},{0,0,0},{0,0,0},{0,0,0},{0,0,0},{0,0,0}, {11,10,10},{26,24,24},{41,36,36},{57,47,47},{72,56,56},{87,64,64},{103,70,70},{118,75,75}, {133,79,79},{149,81,81},{164,82,82},{179,81,81},{195,79,79},{210,75,75},{225,70,70},{241,64,64}, {254,58,56},{254,68,47},{254,80,38},{254,94,29},{255,109,20},{255,126,11},{255,144,2},{255,165,38}, {255,185,87},{255,206,138},{255,227,187},{255,248,238},{255,250,227},{255,243,183},{255,236,140},{255,229,96}, {255,222,53},{255,215,9},{255,207,0},{255,200,0},{255,193,0},{255,185,0},{255,178,0},{255,171,0}, {255,163,0},{255,156,0},{255,149,0},{255,141,0},{255,134,0},{255,127,0},{255,119,0},{255,112,0}, {255,105,0},{255,97,0},{255,90,0},{255,83,0},{255,75,0},{255,68,0},{255,61,0},{255,53,0}, {255,46,0},{255,39,0},{255,31,0},{255,24,0},{255,17,0},{255,9,0},{255,2,0},{255,48,39}, {255,109,93},{255,164,147},{255,213,201},{255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235}, {255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235}, {255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235}, {255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235}, {255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235}, {255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235}, {255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235}, {255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235}, {255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235}, {255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235}, {255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235}, {255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235}, {255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235}, {255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235}, {255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235}, {255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235}, {255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235}, {255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235}, {255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235}, {255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235}, {255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235}, {255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235},{255,240,235}, }; // Knob state (initial values from Pattern Lab) static float knobFlies = 34.0f; // 2..34 static float knobSpeed = 2.275f; // 0.2..5 static float knobGlow = 1.32f; // 0..2 static float knobWind = 0.409f; // 0..2 static constexpr int MAX_FLIES = 16; static int numFlies = 16; // active count (capped at 16) // Firefly motion parameters (constant per firefly, set in setup) static float fly_s1[MAX_FLIES]; static float fly_s2[MAX_FLIES]; static float fly_hb[MAX_FLIES]; // Phase accumulators (each wraps at TWO_PI) static float phase_fu[MAX_FLIES]; // main x-osc static float phase_fv_main[MAX_FLIES]; // main y-osc static float phase_fv_extra[MAX_FLIES];// secondary y-osc (freq 0.9) static float phase_b[MAX_FLIES]; // brightness oscillation // Output buffers used by draw() static float fu[MAX_FLIES]; static float fv[MAX_FLIES]; static float fb[MAX_FLIES]; // Grass sway phases static float grass_phase1 = 0.0f; // freq 1.8 static float grass_phase2 = 0.0f; // freq 2.6 // Cloud drift accumulator (unwrapped – feeds noise coordinates, not sin) static float cloudT = 0.0f; void setup() { PFMath::buildSinLUT(); // idempotent for (int i = 0; i < MAX_FLIES; ++i) { // deterministic per-firefly constants (replace sin‑based hash with cellHash) fly_s1[i] = 0.13f + 0.11f * PFNoise::cellHash(i, 0, 7); fly_s2[i] = 0.09f + 0.13f * PFNoise::cellHash(i, 0, 8); fly_hb[i] = PFNoise::cellHash(i, 0, 9); // random initial phases phase_fu[i] = PFNoise::cellHash(i, 0, 10) * TWO_PI; phase_fv_main[i] = PFNoise::cellHash(i, 0, 11) * TWO_PI; phase_fv_extra[i]= PFNoise::cellHash(i, 0, 12) * TWO_PI; phase_b[i] = PFNoise::cellHash(i, 0, 13) * TWO_PI; // initial values so first frame is valid fu[i] = 0.5f + 0.44f * PFMath::fastSin(phase_fu[i] + i * 2.39f); fv[i] = 0.62f + 0.30f * PFMath::fastSin(phase_fv_main[i] + i * 5.17f) + 0.05f * PFMath::fastSin(phase_fv_extra[i] + (float)i); float p = PFMath::fastSin(phase_b[i] + i * 1.7f); float pp = fmaxf(0.0f, p); fb[i] = pp * pp * pp; // x^3 } grass_phase1 = 0.0f; grass_phase2 = 0.0f; cloudT = 0.0f; } void update(float dt, const InputFrame& input) { // ----- knobs ----- knobFlies += input.knobDeltas[0] * 0.05f; if (knobFlies < 2.0f) knobFlies = 2.0f; if (knobFlies > 34.0f) knobFlies = 34.0f; knobSpeed += input.knobDeltas[1] * 0.1f; if (knobSpeed < 0.2f) knobSpeed = 0.2f; if (knobSpeed > 5.0f) knobSpeed = 5.0f; knobGlow += input.knobDeltas[2] * 0.05f; if (knobGlow < 0.0f) knobGlow = 0.0f; if (knobGlow > 2.0f) knobGlow = 2.0f; knobWind += input.knobDeltas[3] * 0.05f; if (knobWind < 0.0f) knobWind = 0.0f; if (knobWind > 2.0f) knobWind = 2.0f; int flies = (int)lroundf(knobFlies); if (flies < 2) flies = 2; if (flies > 16) flies = 16; numFlies = flies; const float speed = knobSpeed; // ----- firefly phases & buffers ----- for (int i = 0; i < MAX_FLIES; ++i) { phase_fu[i] += dt * speed * fly_s1[i] * 2.0f; phase_fv_main[i] += dt * speed * fly_s2[i] * 2.0f; phase_fv_extra[i] += dt * speed * 0.9f; float freqB = 0.8f + 0.5f * fly_hb[i]; phase_b[i] += dt * speed * freqB; // wrap each phase at TWO_PI while (phase_fu[i] > TWO_PI) phase_fu[i] -= TWO_PI; while (phase_fv_main[i] > TWO_PI) phase_fv_main[i] -= TWO_PI; while (phase_fv_extra[i] > TWO_PI) phase_fv_extra[i] -= TWO_PI; while (phase_b[i] > TWO_PI) phase_b[i] -= TWO_PI; fu[i] = 0.5f + 0.44f * PFMath::fastSin(phase_fu[i] + i * 2.39f); fv[i] = 0.62f + 0.30f * PFMath::fastSin(phase_fv_main[i] + i * 5.17f) + 0.05f * PFMath::fastSin(phase_fv_extra[i] + (float)i); float p = PFMath::fastSin(phase_b[i] + i * 1.7f); float pp = fmaxf(0.0f, p); fb[i] = pp * pp * pp; } // ----- grass phases ----- grass_phase1 += dt * speed * 1.8f; while (grass_phase1 > TWO_PI) grass_phase1 -= TWO_PI; grass_phase2 += dt * speed * 2.6f; while (grass_phase2 > TWO_PI) grass_phase2 -= TWO_PI; // ----- cloud drift (offset only, no sin → precision loss negligible) ----- cloudT += dt * speed * (0.4f + knobWind * 0.8f); } void draw() { const int W = PANEL_RES_W; const int H = PANEL_RES_H; const float vh = (float)W; // logical vertical extent const float vw = (float)H; // logical horizontal extent const float vh_half = vh * 0.5f; const float glowSq = knobGlow * knobGlow; const float wind = knobWind; const int n = numFlies; // ----- pre‑compute per‑row data (depends only on u = y) ----- float hillTop[H]; float grassGh[H]; for (int u = 0; u < H; ++u) { float hu = (float)u; hillTop[u] = vh * 0.58f + PFMath::fastSin(hu * 0.09f + 2.0f) * 5.0f + PFMath::fastSin(hu * 0.023f) * 8.0f; int gx = u / 2; float hh = PFNoise::cellHash(gx, 0, 91); // 0..1 grassGh[u] = 10.0f + hh * 16.0f; } const float cloudDrift = cloudT * (0.4f + wind * 0.8f); for (int y = 0; y < H; ++y) { const int u = y; // logical x in JS const float hill = hillTop[u]; const float gh = grassGh[u]; for (int x = 0; x < W; ++x) { const int v = W - 1 - x; // logical y in JS const float g = (float)v / vh; // normalized 0..1 float val = 0.05f + 0.14f * g; // ----- clouds (only upper half of the view) ----- if ((float)v < vh_half) { float cn = PFNoise::valueNoise2D(u * 0.045f + cloudDrift * 0.12f, v * 0.09f + cloudDrift * 0.015f) * 0.65f + PFNoise::valueNoise2D(u * 0.11f - cloudDrift * 0.07f, v * 0.22f + 40.0f) * 0.35f; cn *= 1.0f - (g / 0.5f) * 0.7f; // g < 0.5 here float cd = (cn - 0.38f) / 0.18f; if (cd > 0.0f) { float soft = (cd >= 1.0f) ? 1.0f : cd * cd * (3.0f - 2.0f * cd); // smoothstep val += soft * 0.13f * 1.5f; // lit = 1.5 } } // ----- distant hill silhouette ----- if (v >= hill) { val = 0.07f; } // ----- foreground grass (swaying) ----- float sway = PFMath::fastSin(u * 0.3f + grass_phase1) * wind * 4.0f + PFMath::fastSin(u * 0.9f - grass_phase2) * wind * 2.0f; float grassTop = vh - gh + sway; if (v >= grassTop) { val = 0.015f; if (v - grassTop < 1.2f) val = 0.11f; // moonlit tips } // ----- fireflies (additive glow) ----- for (int i = 0; i < n; ++i) { float du = (float)u - fu[i] * vw; float dv = (float)v - fv[i] * vh; float dd = du * du + dv * dv; if (dd < glowSq * 9.0f) { val += fb[i] * expf(-dd / glowSq); } } // ----- clamp and map through ramp ----- if (val < 0.0f) val = 0.0f; if (val > 1.0f) val = 1.0f; int idx = (int)(val * 255.0f + 0.5f); if (idx < 0) idx = 0; if (idx > 255) idx = 255; PFCanvas::setPixel(x, y, RAMP_LUT[idx][0], RAMP_LUT[idx][1], RAMP_LUT[idx][2]); } } PFCanvas::present(); } } // namespace FireflyHollow // ── Made with Patternflow Pattern Lab · https://patternflow.work/pattern-lab ── // Shared under CC-BY-SA-4.0. Attribution is part of this licence — // please keep this notice and the author credit above when you reuse, // remix, or redistribute this pattern. Do not delete it.

Firefly Hollow

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