From 3c51a1994f41b625823c4f15e92396b5498ce23c Mon Sep 17 00:00:00 2001 From: Matthias Schiffer Date: Tue, 24 Dec 2019 13:53:16 +0100 Subject: Move renderer into "runtime" subdirectory --- src/renderer/runtime/view/util/image.ts | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+) create mode 100644 src/renderer/runtime/view/util/image.ts (limited to 'src/renderer/runtime/view/util/image.ts') diff --git a/src/renderer/runtime/view/util/image.ts b/src/renderer/runtime/view/util/image.ts new file mode 100644 index 0000000..37c5e7f --- /dev/null +++ b/src/renderer/runtime/view/util/image.ts @@ -0,0 +1,33 @@ +import { Renderer } from '../renderer/renderer'; + +export function loadImage(url: string): Promise { + 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]; +} -- cgit v1.2.3