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import { Renderer } from '../renderer/renderer';
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]] {
const gl = r.getContext();
const texture = gl.createTexture();
if (!texture)
throw new Error('unable to create texture');
gl.bindTexture(gl.TEXTURE_2D, texture);
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, src);
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] = [
src.width / r.coordScale, src.height / r.coordScale,
];
return [texture, size];
}
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