问题描述
我要捕捉的屏幕。 Libgdx提供了在ScreenUtils类。
I want to capture the screen. Libgdx provides some functions defined in the ScreenUtils class.
例如最后像素图像素图= ScreenUtils.getFrameBufferPixmap（X，Y，W，H）;
我的问题是，它需要大约1-3秒，以获取该信息。在这段时间内游戏循环被阻塞，用户将其定义为滞后。
My problem is that it takes about 1-3 seconds to get that information. During that time the game loop is blocked and the user will define it as a lag.
在内部， ScreenUtils 类，使用 Gdx.gl.glReadPixels 。如果我在一个线程中运行 ScreenUtils.getFrameBufferPixmap 方法，没有滞后，但它在错误的方法，这是因为游戏循环运行和变化的逻辑捕获屏幕的东西。
Internally the ScreenUtils class, uses Gdx.gl.glReadPixels. If I run the ScreenUtils.getFrameBufferPixmap method in a thread, there is no lag, but it captures the screen at the wrong method, which is logical since the game loop runs and changes stuff.
是它在某种程度上可以复制的GL上下文或保存并生成像素图在一次与线程的帮助稍后？当然，复制/保存操作，应立即做，否则我不会放过任何东西。
Is it somehow possible to copy the GL context or save it and generate the Pixmap at a later point of time with the help of a Thread? Of course the copy/save operation should be done instantly, otherwise I don't spare anything.
我用 ShapeRenderer 渲染我的东西到屏幕上。
I use ShapeRenderer to render my stuff onto the screen.
推荐答案
一些研究之后，我发现更快的替代glReadPixels - 像素缓冲区对象这是由于Android 4.3可用 - 的
After little research I have found faster alternative to glReadPixels - Pixel Buffer Object which is available since Android 4.3 - https://vec.io/posts/faster-alternatives-to-glreadpixels-and-glteximage2d-in-opengl-es
这是不可能调用glReadPixels其他线程不是渲染线程 - http://stackoverflow.com/a/19975386/2158970
It is not possible to call glReadPixels on other thread than render thread - http://stackoverflow.com/a/19975386/2158970
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