Laya 3D屏幕截图

/**

* 获取屏幕截图

public static getScreenTexture():Laya.Texture|Laya.Texture2D{

try {

let _texture:any = null;

//http://ask.layabox.com/question/47246

let gl:any = (Laya.WebGLContext as any).mainContext;//WebGL2RenderingContext

let pixels:Uint8Array = new Uint8Array(gl.drawingBufferWidth*gl.drawingBufferHeight*4);

gl.readPixels(0,0,gl.drawingBufferWidth,gl.drawingBufferHeight,gl.RGBA,gl.UNSIGNED_BYTE,pixels);

let w: number = gl.drawingBufferWidth;

let h: number = gl.drawingBufferHeight;

let texture2d: Laya.Texture2D = new Laya.Texture2D(w,h,Laya.TextureFormat.R8G8B8A8,false,false);

texture2d.setPixels(pixels);

_texture = new Laya.Texture(texture2d);//这里是上下颠倒的图片

// _texture =Laya.stage.drawToTexture(Laya.stage.width,Laya.stage.height,0,0);//这个原生API只能截2D图，3D场景的无法截图

return _texture;

} catch (error) {

}

return null;

}