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import { nextPowerOf2 } from '../../util';
import { Renderer } from '../renderer/renderer';
import { SpriteCoords } from '../sprite';
export function loadImage(url: string): Promise<HTMLImageElement> {
return new Promise((resolve, reject) => {
const img = new Image();
img.addEventListener('load', () => { resolve(img); });
img.addEventListener('error', () => { reject(new Error('failed to load ' + url)); });
img.src = url;
});
}
export function mkTexture(
r: Renderer,
src: HTMLCanvasElement|HTMLImageElement,
): [WebGLTexture, [number, number], SpriteCoords] {
const gl = r.getContext();
const texture = gl.createTexture();
if (!texture)
throw new Error('unable to create texture');
const w = src.width, h = src.height;
const w2 = nextPowerOf2(w), h2 = nextPowerOf2(h);
const canvas = document.createElement('canvas');
canvas.width = w2;
canvas.height = h2;
const ctx = canvas.getContext('2d') as CanvasRenderingContext2D;
ctx.drawImage(src, 0, 0);
gl.bindTexture(gl.TEXTURE_2D, texture);
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, canvas);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
const size: [number, number] = [
w / r.coordScale, h / r.coordScale,
];
const coords: SpriteCoords = [
0, 0, w2 / r.coordScale, h2 / r.coordScale,
];
return [texture, size, coords];
}
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