XNA 4 中的模板测试 [英] Stencil testing in XNA 4

问题描述

我能够在 XNA 3.1 中做到这一点，但是我看到我们现在在 XNA 4 中使用状态对象，这当然是一个改进，尽管到目前为止我无法完成我想要的 :)

I was able to do this in XNA 3.1, however I see that we now use state objects in XNA 4, which is certainly an improvement, although I can't accomplish what I want so far :)

我正在尝试:

将模板缓冲区清零.

将纹理绘制到模板缓冲区，将绘制纹理的模板缓冲区设置为 1.

Draw a texture to the stencil buffer, setting the stencil buffer to 1 where the texture is drawn.

绘制另一个纹理，该纹理只会出现在模板缓冲区不是 1 的地方.

Draw another texture that will only appear where the stencil buffer is not 1.

这是我到目前为止所拥有的，它似乎对纹理 2 的绘制没有影响:

Here is what I have so far, which appears to have no effect on the drawing of texture 2:

BlendState blend = new BlendState();
blend.ColorWriteChannels = ColorWriteChannels.None;


_preSparkStencil = new DepthStencilState();
_preSparkStencil.StencilEnable = true;
_preSparkStencil.StencilFunction = CompareFunction.Always;
_preSparkStencil.ReferenceStencil = 1;
_preSparkStencil.DepthBufferEnable = true;

_sparkStencil = new DepthStencilState();
_sparkStencil.StencilEnable = true;
_sparkStencil.StencilFunction = CompareFunction.NotEqual;
_sparkStencil.ReferenceStencil = 1;
_sparkStencil.DepthBufferEnable = true;

gd.DepthStencilState = _preSparkStencil;

gd.Clear(ClearOptions.Stencil, Color.Black, 0, 0);

sb.Begin(SpriteSortMode.Deferred, blend);

DrawTexture1();

sb.End();

gd.DepthStencilState = _sparkStencil;

sb.Begin(SpriteSortMode.Deferred, BlendState.NonPremultiplied);
DrawTexture2();
sb.End();

gd.DepthStencilState = old;

推荐答案

问题是RenderState需要传入SpriteBatch，否则SpriteBatch会使用自己的RenderState.

The problem was that the RenderState needs to be passed into SpriteBatch, or else the SpriteBatch will use it's own RenderState.

    sb.Begin(SpriteSortMode.Deferred, BlendState.Opaque, 
        SamplerState.LinearWrap, _preSparkStencil, 
        RasterizerState.CullCounterClockwise, CLM.AlphaClip);

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