73 lines
1.8 KiB
TypeScript
73 lines
1.8 KiB
TypeScript
import { Renderer } from './renderer/renderer';
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import { SpriteCoords, SpriteView, SpriteViewBuilder } from './sprite';
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import { loadImage, mkTexture } from './util/image';
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import { MapData } from '../model/data/map';
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import { nextPowerOf2 } from '../util';
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interface Tileset {
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texture: WebGLTexture;
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tiles: SpriteCoords[];
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}
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function loadTiles(tiles: string[]): Promise<HTMLImageElement[]> {
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return Promise.all(tiles.map((t) => loadImage(`resources/sprite/tile/${t}.png`)));
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}
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function mkTileset(
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r: Renderer,
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tiles: HTMLImageElement[],
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): Tileset {
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const tileSize = 32;
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const canvasDim = nextPowerOf2(Math.sqrt(tiles.length));
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const canvasSize = canvasDim * tileSize;
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const canvas = document.createElement('canvas');
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canvas.width = canvas.height = canvasSize;
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let x = 0, y = 0;
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const tileCoords: SpriteCoords[] = [];
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const ctx = canvas.getContext('2d') as CanvasRenderingContext2D;
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for (const tile of tiles) {
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ctx.drawImage(tile, x * tileSize, y * tileSize);
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tileCoords.push([x / canvasDim, y / canvasDim, (x + 1) / canvasDim, (y + 1) / canvasDim]);
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x++;
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if (x === canvasDim) {
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x = 0;
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y++;
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}
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}
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const [texture] = mkTexture(r, canvas);
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return {
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texture,
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tiles: tileCoords,
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};
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}
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function addSprite(builder: SpriteViewBuilder, tileset: Tileset, x: number, y: number, tile: number) {
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if (tile === 0)
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return;
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const tilePos = tileset.tiles[tile - 1];
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builder.addSprite([x, y, x + 1, y + 1], tilePos);
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}
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export async function loadMap(r: Renderer, map: MapData): Promise<SpriteView> {
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const tiles = await loadTiles(map.tiles);
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const tileset = mkTileset(r, tiles);
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const builder = new SpriteViewBuilder(r, tileset.texture);
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for (const layer of map.layers)
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for (let x = 0; x < map.width; x++)
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for (let y = 0; y < map.height; y++)
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addSprite(builder, tileset, x, y, layer[y][x]);
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return builder.build();
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}
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