JavaScript DOM 图片预加载

Question

https://webgl2fundamentals.org/webgl/lessons/webgl-3d-textures.html

在上面的 link 中，我必须创建一个新图像并在加载后将其发送到缓冲区。

var image = new Image();
image.src = "resource/1.png";
image.onload = ()=>{
  gl.bindTexture(gl.TEXTURE_2D, texture);
  gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, image);
  gl.generateMipmap(gl.TEXTURE_2D);
}

如何预加载图片并使用？

var image = "data";

gl.bindTexture(gl.TEXTURE_2D, texture);
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, image);
gl.generateMipmap(gl.TEXTURE_2D);

Answer 1

您可以为此使用异步函数：

async function loadImage(src) {
  const image = new Image();
  image.src = src;
  return new Promise((resolve,reject)=>{
    image.onload = ()=>resolve(image);
    image.onerror = ()=>reject(new Error(`Failed to load image at "${src}"`));
  });
}

let img = await loadImage("resource/1.png");
gl.bindTexture(gl.TEXTURE_2D, texture);
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, img);
gl.generateMipmap(gl.TEXTURE_2D);

JavaScript DOM 图片预加载

JavaScript DOM image preload

javascript

webgl