import { TextureClamp } from "./TextureClamp.ts";

interface TextureData {
	data: Uint8ClampedArray;
	width: number;
	height: number;
}

/** Nearest-neighbor texture sampler from pixel data. */
export class TextureSampler {
	#clamp = new TextureClamp();

	/** Samples a texture at UV coordinates using nearest-neighbour lookup. */
	sample(
		texture: TextureData,
		u: number,
		v: number,
	): { r: number; g: number; b: number; a: number } {
		const { x, y } = this.#clamp.clamp(u, v, texture.width, texture.height);
		const idx = (y * texture.width + x) * 4;
		return {
			r: texture.data[idx],
			g: texture.data[idx + 1],
			b: texture.data[idx + 2],
			a: texture.data[idx + 3],
		};
	}
}