c# - 尝试理解模板(XNA 4.0、Windows Phone 7)

Question

我正在尝试理解模板。我可以使用一个很好的教程来解释它们是如何工作的，但与此同时，我正在使用的是:

DepthStencilState _StencilAlways;
DepthStencilState _StencilKeepIfZero;

SpriteBatch _StencilBatch;
SpriteBatch _MaskBatch;

_StencilAlways = new DepthStencilState();
_StencilAlways.StencilEnable = true;
_StencilAlways.StencilFunction = CompareFunction.Always;
_StencilAlways.StencilPass = StencilOperation.Replace;
_StencilAlways.ReferenceStencil = 1;
_StencilAlways.DepthBufferEnable = false; 

_StencilKeepIfZero = new DepthStencilState();
_StencilKeepIfZero.StencilEnable = true;
_StencilKeepIfZero.StencilFunction = CompareFunction.Equal;
_StencilKeepIfZero.StencilPass = StencilOperation.Keep;
_StencilKeepIfZero.ReferenceStencil = 0;
_StencilKeepIfZero.DepthBufferEnable = false;

RenderTarget2D MaskRenderTarget = new RenderTarget2D(device, Width, Height, false, SurfaceFormat.Color, DepthFormat.Depth24Stencil8, 0, RenderTargetUsage.DiscardContents);

GraphicsDevice.SetRenderTarget(MaskRenderTarget);
GraphicsDevice.Clear(ClearOptions.Target | ClearOptions.Stencil, new Color(0, 0, 0, 1), 0, 0);

_MaskBatch.Begin(SpriteSortMode.Immediate, null, null, _StencilAlways, null);
_MaskBatch.Draw(
    Texture,
    Position,
    null,
    Shade,
    0,
    Vector2.Zero,
    Scale,
    SpriteEffects.None,
    0);
_MaskBatch.End();

_StencilBatch.Begin(SpriteSortMode.Immediate, null, null, _StencilKeepIfZero, null);
_StencilBatch.DrawString(
    _Font, 
    Line, 
    Position2, 
    Shade);
_StencilBatch.End();

_RenderedTexture = MaskRenderTarget;

GraphicsDevice.SetRenderTargets(null);

可能存在一些换位/卫生错误，但您知道我做错了什么吗？

Answer 1

我建议搜索与 XNA/Windows Phone 无关的模板缓冲区的使用。最终值或用法完全相同。

所有显卡都支持的基本功能，DirectX 和 OpenGL 都绑定(bind)了它。

http://en.wikipedia.org/wiki/Stencil_buffer 或者 http://www.google.cz/search?q=stencil+buffer