1 files changed, 73 insertions, 0 deletions
diff --git a/src/view/map.ts b/src/view/map.ts
new file mode 100644
index 0000000..954e39e
--- /dev/null
+++ b/src/view/map.ts
@@ -0,0 +1,73 @@
+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();
+}