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src/app/previews/BiomeSource.ts

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+import { stringToColor } from '../Utils'
+import { NormalNoise } from './noise/NormalNoise'
+
+export type BiomeColors =Record<string, number[]>
+export type BiomeSourceOptions = {
+	biomeColors: BiomeColors,
+	offset: [number, number],
+	scale: number,
+	res: number,
+	seed: string,
+}
+
+export const NoiseMaps = ['altitude', 'temperature', 'humidity', 'weirdness']
+
+export function biomeSource(state: any, img: ImageData, options: BiomeSourceOptions) {
+	switch (state?.type?.replace(/^minecraft:/, '')) {
+		case 'multi_noise': return multiNoise(state, img, options)
+		case 'fixed': return fixed(state, img, options)
+		case 'checkerboard': return checkerboard(state, img, options)
+	}
+}
+
+function fixed(state: any, img: ImageData, options: BiomeSourceOptions) {
+	const data = img.data
+	const color = getBiomeColor(state.biome, options.biomeColors)
+	const row = img.width * 4 / options.res
+	const col = 4 / options.res
+	for (let x = 0; x < 200; x += options.res) {
+		for (let y = 0; y < 200; y += options.res) {
+			const i = y * row + x * col
+			data[i] = color[0]
+			data[i + 1] = color[1]
+			data[i + 2] = color[2]
+			data[i + 3] = 255
+		}
+	}
+}
+
+function checkerboard(state: any, img: ImageData, options: BiomeSourceOptions) {
+	const biomeColorCache: BiomeColors = {}
+	state.biomes?.forEach((b: string) => {
+		biomeColorCache[b] = getBiomeColor(b, options.biomeColors)
+	})
+
+	const data = img.data
+	const ox = -options.offset[0] - 100 + options.res / 2
+	const oy = -options.offset[1] - 100 + options.res / 2
+	const row = img.width * 4 / options.res
+	const col = 4 / options.res
+	const shift = (state.scale ?? 2) + 2
+	const numBiomes = state.biomes?.length ?? 0
+	for (let x = 0; x < 200; x += options.res) {
+		for (let y = 0; y < 200; y += options.res) {
+			const i = y * row + x * col
+			const xx = (x + ox) * options.scale
+			const yy = (y + oy) * options.scale
+			const j = (((xx >> shift) + (yy >> shift)) % numBiomes + numBiomes) % numBiomes
+			const b = state.biomes?.[j]
+			const color = biomeColorCache[b] ?? [128, 128, 128]
+			data[i] = color[0]
+			data[i + 1] = color[1]
+			data[i + 2] = color[2]
+			data[i + 3] = 255
+		}
+	}
+}
+
+function multiNoise(state: any, img: ImageData, options: BiomeSourceOptions) {
+	const noise = NoiseMaps.map((id, i) => {
+		const config = state[`${id}_noise`]
+		return new NormalNoise(options.seed + i, config.firstOctave, config.amplitudes)
+	})
+
+	const biomeColorCache: BiomeColors = {}
+	state.biomes.forEach((b: any) => {
+		biomeColorCache[b.biome] = getBiomeColor(b.biome, options.biomeColors)
+	})
+
+	const data = img.data
+	const ox = -options.offset[0] - 100 + options.res / 2
+	const oy = -options.offset[1] - 100 + options.res / 2
+	const row = img.width * 4 / options.res
+	const col = 4 / options.res
+	for (let x = 0; x < 200; x += options.res) {
+		for (let y = 0; y < 200; y += options.res) {
+			const i = y * row + x * col
+			const xx = (x + ox) * options.scale
+			const yy = (y + oy) * options.scale
+			const b = closestBiome(noise, state.biomes, xx, yy)
+			const color = biomeColorCache[b] ?? [128, 128, 128]
+			data[i] = color[0]
+			data[i + 1] = color[1]
+			data[i + 2] = color[2]
+			data[i + 3] = 255
+		}
+	}
+}
+
+export function getBiome(state: any, x: number, y: number, options: BiomeSourceOptions): string | undefined {
+	const [xx, yy] = toWorld([x, y], options)
+	switch (state?.type?.replace(/^minecraft:/, '')) {
+		case 'multi_noise':
+			const noise = NoiseMaps.map((id, i) => {
+				const config = state[`${id}_noise`]
+				return new NormalNoise(options.seed + i, config.firstOctave, config.amplitudes)
+			})
+			return closestBiome(noise, state.biomes, xx, yy)
+		case 'fixed': return state.biome
+		case 'checkerboard':
+			const shift = (state.scale ?? 2) + 2
+			const numBiomes = state.biomes?.length ?? 0
+			const j = (((xx >> shift) + (yy >> shift)) % numBiomes + numBiomes) % numBiomes
+			return state.biomes?.[j]
+	}
+	return undefined
+}
+
+export function getBiomeColor(biome: string, biomeColors: BiomeColors) {
+	if (!biome) {
+		return [128, 128, 128]
+	}
+	const color = biomeColors[biome]
+	if (color === undefined) {
+		return stringToColor(biome)
+	}
+	return color
+}
+
+function toWorld([x, y]: [number, number], options: BiomeSourceOptions) {
+	const xx = (x - options.offset[0] - 100 + options.res / 2) * options.scale
+	const yy = (y - options.offset[1] - 100 + options.res / 2) * options.scale
+	return [xx, yy]
+}
+
+function closestBiome(noise: NormalNoise[], biomes: any[], x: number, y: number): string {
+	if (!Array.isArray(biomes) || biomes.length === 0) return ''
+	const n = noise.map(n => n.getValue(x, y, 0))
+	let minDist = Infinity
+	let minBiome = ''
+	for (const b of biomes) {
+		const dist = fitness(b.parameters, {altitude: n[0], temperature: n[1], humidity: n[2], weirdness: n[3], offset: 0})
+		if (dist < minDist) {
+			minDist = dist
+			minBiome = b.biome
+		}
+	}
+	return minBiome
+}
+
+function fitness(a: any, b: any) {
+	return (a.altitude - b.altitude) * (a.altitude - b.altitude) + (a.temperature - b.temperature) * (a.temperature - b.temperature) + (a.humidity - b.humidity) * (a.humidity - b.humidity) + (a.weirdness - b.weirdness) * (a.weirdness - b.weirdness) + (a.offset - b.offset) * (a.offset - b.offset)
+}