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import MapData from '../model/data/MapData';
import { mapValues, nextPowerOf2 } from '../util';
import Renderer from './renderer/Renderer';
import { TileCoords, TileView, TileViewBuilder } from './tile';
import { loadImages, mkTexture } from './util/image';
interface TileMap {
texture: WebGLTexture;
tiles: Map<string, TileCoords>;
}
function loadTiles(tiles: Map<string, string>): Promise<Map<string, HTMLImageElement>> {
return loadImages(mapValues((t) => `resources/sprite/tile/${t}.png`, tiles));
}
function mkTileMap(
gl: WebGLRenderingContext,
tiles: Map<string, HTMLImageElement>,
): TileMap {
const tileSize = 32;
const canvasDim = nextPowerOf2(Math.sqrt(tiles.size));
const canvasSize = canvasDim * tileSize;
const canvas = document.createElement('canvas');
canvas.width = canvas.height = canvasSize;
let x = 0, y = 0;
const map: Map<string, TileCoords> = new Map();
const ctx = canvas.getContext('2d') as CanvasRenderingContext2D;
for (const [k, tile] of tiles) {
ctx.drawImage(tile, x * tileSize, y * tileSize);
map.set(k, [x / canvasDim, y / canvasDim, (x + 1) / canvasDim, (y + 1) / canvasDim]);
x++;
if (x === canvasDim) {
x = 0;
y++;
}
}
return {
texture: mkTexture(gl, canvas),
tiles: map,
};
}
function addTile(builder: TileViewBuilder, tileMap: TileMap, x: number, y: number, tile: string) {
if (tile === ' ')
return;
const tilePos = tileMap.tiles.get(tile);
if (!tilePos)
throw new Error('invalid tile specifier in map data');
builder.addTile([x, y, x + 1, y + 1], tilePos);
}
export async function loadMap(r: Renderer, map: MapData): Promise<TileView> {
const tiles = await loadTiles(map.tiles);
const tileMap = mkTileMap(r.getContext(), tiles);
const builder = new TileViewBuilder(r, tileMap.texture);
for (const layer of map.layers)
for (let x = 0; x < map.width; x++)
for (let y = 0; y < map.height; y++)
addTile(builder, tileMap, x, y, layer[y][x]);
return builder.build();
}
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