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import { EntityView } from './entity';
import { Renderer } from './renderer/renderer';
import { SpriteCoords, SpriteView, SpriteViewBuilder } from './sprite';
import { loadImage, mkTexture } from './util/image';
import { MapData } from '../model/data/map';
import { nextPowerOf2 } from '../util';
interface StaticMapTile {
type: 'static';
image: HTMLImageElement;
}
interface EntityTile {
type: 'entity';
entity: EntityView;
}
type MapTile = StaticMapTile | EntityTile;
interface StaticTilesetTile {
type: 'static';
coords: SpriteCoords;
}
type TilesetTile = StaticTilesetTile | EntityTile;
interface Tileset {
texture: WebGLTexture;
tiles: TilesetTile[];
}
async function loadTile(r: Renderer, tile: string): Promise<MapTile> {
const name = tile.substr(1);
switch (tile[0]) {
case '-':
return {
type: 'static',
image: await loadImage(`resources/sprite/tile/${name}.png`),
};
case '@':
return {
type: 'entity',
entity: await EntityView.load(r, name),
};
default:
throw new Error('invalid tile specifier');
}
}
function loadTiles(r: Renderer, tiles: string[]): Promise<MapTile[]> {
return Promise.all(tiles.map((tile) => loadTile(r, tile)));
}
function mkTileset(r: Renderer, mapTiles: MapTile[]): Tileset {
const tileSize = 32;
const canvasDim = nextPowerOf2(Math.sqrt(mapTiles.length));
const canvasSize = canvasDim * tileSize;
const canvas = document.createElement('canvas');
canvas.width = canvas.height = canvasSize;
let x = 0;
let y = 0;
const tiles: TilesetTile[] = [];
const ctx = canvas.getContext('2d') as CanvasRenderingContext2D;
for (const tile of mapTiles) {
switch (tile.type) {
case 'static':
ctx.drawImage(tile.image, x * tileSize, y * tileSize);
tiles.push({
type: 'static',
coords: [
x / canvasDim,
y / canvasDim,
(x + 1) / canvasDim,
(y + 1) / canvasDim,
],
});
x++;
if (x === canvasDim) {
x = 0;
y++;
}
break;
case 'entity':
tiles.push(tile);
break;
}
}
const [texture] = mkTexture(r, canvas);
return {
texture,
tiles,
};
}
function addSprite(
builder: SpriteViewBuilder,
entityTiles: Array<[[number, number], EntityView]>,
tileset: Tileset,
x: number,
y: number,
tile: number,
): void {
if (!tile) return;
const tilesetTile = tileset.tiles[tile - 1];
switch (tilesetTile.type) {
case 'static':
builder.addSprite([x, y, x + 1, y + 1], tilesetTile.coords);
break;
case 'entity':
entityTiles.push([[x + 0.5, y + 0.5], tilesetTile.entity]);
break;
}
}
class MapLayerView {
public constructor(
private r: Renderer,
private staticTiles: SpriteView,
private entityTiles: Array<[[number, number], EntityView]>,
) {}
public render(time: number): void {
this.r.setTranslation([0, 0]);
this.staticTiles.render();
for (const [coords, entity] of this.entityTiles) {
this.r.setTranslation(coords);
entity.renderByTime(time);
}
}
}
function buildMapLayer(r: Renderer, tileset: Tileset, layer: number[][]): MapLayerView {
const builder = new SpriteViewBuilder(r, tileset.texture);
const entityTiles: Array<[[number, number], EntityView]> = [];
for (let x = 0; x < layer[0].length; x++)
for (let y = 0; y < layer.length; y++) addSprite(builder, entityTiles, tileset, x, y, layer[y][x]);
return new MapLayerView(r, builder.build(), entityTiles);
}
export class MapView {
public static async load(r: Renderer, map: MapData): Promise<MapView> {
const tiles = await loadTiles(r, map.tiles);
const tileset = mkTileset(r, tiles);
const layers = map.layers.map((layer) => buildMapLayer(r, tileset, layer.tiles));
return new MapView(layers);
}
private constructor(private layers: MapLayerView[]) {}
public render(time: number): void {
for (const layer of this.layers) layer.render(time);
}
}
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