Texture.ts

function handleLoadedTexture(texture){
    gl.pixelStorei(gl.UNPACK_FLIP_Y_WEBGL, true);
    gl.bindTexture(gl.TEXTURE_2D, texture);
    gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, texture.image);
    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR);
    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR_MIPMAP_NEAREST);
    gl.generateMipmap(gl.TEXTURE_2D);
    gl.bindTexture(gl.TEXTURE_2D, null);
}

function loadTexture(file_path: string){
    var texture = gl.createTexture();
    texture.image = new Image();
    texture.image.onload = function () {
        handleLoadedTexture(texture)
    }
    texture.image.src = file_path;

    return texture;
}