LibGDX - 绘制到FrameBuffer不起作用 [英] LibGDX - Drawing to a FrameBuffer does not work

问题描述

所以我正在尝试制作自定义按钮，我需要将按钮背景的不同部分组合在一起。要做到这一点，我认为使用FrameBuffer会起作用，但它没有给出可行的结果。因此，我尝试通过编写一个简单的测试方法来测试我的FrameBuffer绘图方法，该方法返回在每次render（）调用时绘制到显示的纹理。这个方法在这里（请注意，它是一种测试方法，因此可能稍微优化一下）：

So I'm trying to make custom buttons, for which I need to combine different parts of the button background. To do this I figured using a FrameBuffer would work, however it did not give viable results. Therefore I attempted to test my FrameBuffer drawing method, by writing a simple test method, which returns a texture that is drawn to the display at every render() call. This method is here (note that it is a test method, so it may be a little poorly optimized):

    private Texture test()
{
    BitmapFont f = ReverseBlade.fontTitle;
    f.setColor(Color.LIGHT_GRAY);

    FrameBuffer fbo = new FrameBuffer(Format.RGBA8888, (int)f.getBounds("Hi").width, (int)f.getBounds("Hi").height, false);
    Batch b = ReverseBlade.batch;
    OrthographicCamera c = new OrthographicCamera(fbo.getWidth(), fbo.getHeight());

    c.setToOrtho(false);
    c.update();
    b.setProjectionMatrix(c.combined);

    fbo.begin();
    b.begin();

    f.draw(b, "Hi", 0, 0);

    b.end();
    fbo.end();

    Texture t = fbo.getColorBufferTexture();

    fbo.dispose();

    b.setProjectionMatrix(ReverseBlade.camera.combined);

    return t;
}

但是，不会显示任何内容。屏幕很暗......我试过没有相机和我不能再记得的其他多种变化。我做错了什么？

However, nothing is displayed. The screen is dark... I have tried without the camera and multiple other variations that I can no longer remember. What am I doing wrong?

半解决方案
我最不得不做的是为一个新的Matrix4对象FrameBuffer是这样的：

Half Solution What I ended up having to do is to make a new Matrix4 object for the FrameBuffer like this:

Matrix4 m = new Matrix4();
m.setToOrtho2D(0, 0, fbo.getWidth(), fbo.getHeight());
batch.setProjectionMatrix(m);

然而，这使得绘制的所有内容都颠倒过来，如下所示：

However, this makes everything that is drawn be upside down, like this:

推荐答案

因此，按照我在Half Solution中添加的内容，我所要做的就是使用FBo中的纹理创建一个新的Sprite对象并调用flip（false，true）！

So following what I added with the Half Solution, all I had to do was create a new Sprite object with the texture from the FBo and call flip(false, true)!

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