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import {nextPowerOf2} from '../util';
import MapState from '../model/state/MapState';
import Renderer from './renderer/Renderer';
export default class MapView {
public static readonly tileSize: number = 32;
private redrawPending: boolean = false;
private readonly vertexBuffer: WebGLBuffer;
private readonly textureBuffer: WebGLBuffer;
constructor(
private readonly r: Renderer,
private readonly map: MapState,
private readonly tileTexture: WebGLTexture,
private readonly tileMap: Map<string, number>,
) {
const vertexData: number[] = [];
const textureData: number[] = [];
const tileCount = nextPowerOf2(tileMap.size);
for (let x = 0; x < map.data.width; x++)
for (let y = 0; y < map.data.height; y++)
this.addTile(vertexData, textureData, x, y, map.data.layers[0][y][x], tileCount);
const gl = r.getContext();
this.vertexBuffer = r.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, this.vertexBuffer);
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(vertexData), gl.STATIC_DRAW);
this.textureBuffer = r.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, this.textureBuffer);
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(textureData), gl.STATIC_DRAW);
}
public draw(): void {
const gl = this.r.getContext();
gl.clear(gl.COLOR_BUFFER_BIT);
gl.activeTexture(gl.TEXTURE0);
gl.bindTexture(gl.TEXTURE_2D, this.tileTexture);
gl.uniform1i(this.r.getSamplerLoc(), 0);
gl.bindBuffer(gl.ARRAY_BUFFER, this.vertexBuffer);
gl.vertexAttribPointer(this.r.getVertexPosLoc(), 2, gl.FLOAT, false, 0, 0);
gl.bindBuffer(gl.ARRAY_BUFFER, this.textureBuffer);
gl.vertexAttribPointer(this.r.getTextureCoordLoc(), 2, gl.FLOAT, false, 0, 0);
gl.drawArrays(gl.TRIANGLES, 0, 6 * this.map.data.width * this.map.data.height);
}
private addTile(vertexData: number[], textureData: number[], x: number, y: number, tile: string, tileCount: number) {
const tileID = this.tileMap.get(tile);
if (tileID === undefined)
throw new Error('invalid tile specifier in map data');
vertexData.push(x); vertexData.push(y);
vertexData.push(x + 1); vertexData.push(y);
vertexData.push(x); vertexData.push(y + 1);
vertexData.push(x); vertexData.push(y + 1);
vertexData.push(x + 1); vertexData.push(y);
vertexData.push(x + 1); vertexData.push(y + 1);
textureData.push(tileID / tileCount); textureData.push(0);
textureData.push((tileID + 1) / tileCount); textureData.push(0);
textureData.push(tileID / tileCount); textureData.push(1);
textureData.push(tileID / tileCount); textureData.push(1);
textureData.push((tileID + 1) / tileCount); textureData.push(0);
textureData.push((tileID + 1) / tileCount); textureData.push(1);
}
}
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