31 lines
1.1 KiB
TypeScript
31 lines
1.1 KiB
TypeScript
import { Renderer } from '../renderer/renderer';
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export function loadImage(url: string): Promise<HTMLImageElement> {
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return new Promise((resolve, reject) => {
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const img = new Image();
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img.addEventListener('load', () => {
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resolve(img);
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});
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img.addEventListener('error', () => {
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reject(new Error('failed to load ' + url));
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});
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img.src = url;
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});
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}
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export function mkTexture(r: Renderer, src: HTMLCanvasElement | HTMLImageElement): [WebGLTexture, [number, number]] {
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const gl = r.getContext();
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const texture = gl.createTexture();
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if (!texture) throw new Error('unable to create texture');
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gl.bindTexture(gl.TEXTURE_2D, texture);
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gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, src);
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gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
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gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);
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gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
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gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
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const size: [number, number] = [src.width / r.coordScale, src.height / r.coordScale];
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return [texture, size];
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}
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