📄 几何体.htm
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class=GramE><SPAN lang=EN-US
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-fareast-language: ZH-CN">struct</SPAN></SPAN><SPAN
lang=EN-US
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CUSTOMVERTEX {<o:p></o:p></SPAN></P>
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</SPAN>FLOAT x, y, z;<o:p></o:p></SPAN></P>
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lang=EN-US
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</SPAN>FLOAT rhw;<o:p></o:p></SPAN></P>
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lang=EN-US
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-fareast-language: ZH-CN"><SPAN
style="mso-spacerun: yes">
</SPAN>DWORD color;<o:p></o:p></SPAN></P>
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lang=EN-US
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-fareast-language: ZH-CN"><SPAN
style="mso-spacerun: yes">
</SPAN>FLOAT tu, tv;<SPAN style="mso-spacerun: yes"> </SPAN><SPAN
style="mso-spacerun: yes"> </SPAN><SPAN style="COLOR: blue">//</SPAN><SPAN
style="COLOR: green"> 纹理坐标</SPAN><o:p></o:p></SPAN></P>
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lang=EN-US
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-fareast-language: ZH-CN">};<o:p></o:p></SPAN></P>
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style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-fareast-language: ZH-CN"><o:p> </o:p></SPAN></P>
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lang=EN-US
style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-fareast-language: ZH-CN">//</SPAN><SPAN
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style="FONT-SIZE: 10pt; COLOR: green; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-fareast-language: ZH-CN">
自定义FVF，描述了自定义顶点的结构<o:p></o:p></SPAN></P>
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lang=EN-US
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-fareast-language: ZH-CN"><o:p> </o:p></SPAN></P>
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lang=EN-US
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-fareast-language: ZH-CN">#define
D3DFVF_CUSTOMVERTEX (D3DFVF_XYZRHW | D3DFVF_DIFFUSE |
D3DFVF_TEX1)<o:p></o:p></SPAN></P>
<P class=MsoNormal
style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"><SPAN
style="FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-fareast-language: ZH-CN">要创建一个可以保存四个<B><SPAN
lang=EN-US>CUSTOMVERTEX</SPAN></B>结构的顶点缓存，应该把<I
style="mso-bidi-font-style: normal"><SPAN lang=EN-US>Length</SPAN></I>参数指定为<SPAN
lang=EN-US>[4*sizeof(CUSTOMVERTEX)]。<o:p></o:p></SPAN></SPAN></P>
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style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"><SPAN
style="FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-fareast-language: ZH-CN">第二个参数是一组用途控制标志。该参数的值特别用来决定对那些位于视区外的顶点，顶点缓存是否能包含裁剪信息——以裁剪标志的形式。要创建一个不能包含裁剪标志的顶点缓存，应该在<I
style="mso-bidi-font-style: normal"><SPAN lang=EN-US>Usage</SPAN></I>参数中包含<SPAN
lang=EN-US>D3DUSAGE_DONOTCLIP标志。只有在应用程序指明顶点缓存将包含经过变换的顶点——<I
style="mso-bidi-font-style: normal">FVF</I>参数包含D3DFVF_XYZRHW标志——的同时，D3DUSAGE_DONOTCLIP标志才有用。如果应用程序指明缓存将包含未经变换的顶点（D3DFVF_XYZ标志），那么<B
style="mso-bidi-font-weight: normal">IDirect3DDevice9::CreateVertexBuffer</B>方法会忽略D3DUSAGE_DONOTCLIP标志。裁剪标志会占用额外的内存，这使可裁剪的顶点缓存比不能包含裁剪标志的顶点缓存略大。因为这些资源是在创建顶点缓存时分配的，所以必须提前要求可裁剪的顶点缓存。<o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal
style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"><SPAN
style="FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-fareast-language: ZH-CN">第三个参数，<I
style="mso-bidi-font-style: normal"><SPAN
lang=EN-US>FVF</SPAN></I>，是描述顶点缓存的顶点格式的<U><SPAN
lang=EN-US>D3DFVF</SPAN></U>组合。如果把这个参数指定为<SPAN
lang=EN-US>0，那么顶点缓存就是一个非FVF顶点缓存。更多信息，请参阅<U>FVF顶点缓存</U>。第四个参数描述用来存放顶点缓存的内存类型。<o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal
style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"><B
style="mso-bidi-font-weight: normal"><SPAN lang=EN-US
style="FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-fareast-language: ZH-CN">IDirect3DDevice9::CreateVertexBuffer</SPAN></B><SPAN
style="FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-fareast-language: ZH-CN">接收的最后一个参数是变量的地址，如果调用成功，它会把一个指向新的<U><SPAN
lang=EN-US>IDirect3DVertexBuffer9</SPAN></U>顶点缓存对象接口的指针填入该变量。<SPAN
lang=EN-US><o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal><B style="mso-bidi-font-weight: normal"><SPAN
style="FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-fareast-language: ZH-CN">注意</SPAN></B><SPAN
style="FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-fareast-language: ZH-CN">
如果应用程序在创建顶点缓存时不支持裁剪标志，那么就不能生成裁剪标志。<SPAN lang=EN-US><o:p></o:p></SPAN></SPAN></P>
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style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"><SPAN
style="FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-fareast-language: ZH-CN">以下<SPAN
lang=EN-US>C++示例代码显示了如何在代码中创建一个顶点缓存。<o:p></o:p></SPAN></SPAN></P>
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style="mso-spacerun: yes"> </SPAN><SPAN
style="COLOR: blue">//</SPAN><SPAN style="COLOR: green">
根据本示例的目的，d3dDevice变量是一个由Direct3DDevice对象暴露的</SPAN><o:p></o:p></SPAN></P>
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style="mso-spacerun: yes"> </SPAN><SPAN
style="COLOR: blue">//</SPAN><SPAN style="COLOR: green">
IDirect3DDevice9接口的地址，g_pVB是一个LPDIRECT3DVERTEXBUFFER9类型的变量。</SPAN><o:p></o:p></SPAN></P>
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lang=EN-US
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-fareast-language: ZH-CN"><o:p> </o:p></SPAN></P>
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lang=EN-US
style="FONT-SIZE: 10pt; COLOR: green; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-fareast-language: ZH-CN">
自定义顶点类型</SPAN><SPAN lang=EN-US
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-fareast-language: ZH-CN"><o:p></o:p></SPAN></P>
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class=GramE><SPAN lang=EN-US
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-fareast-language: ZH-CN">struct</SPAN></SPAN><SPAN
lang=EN-US
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-fareast-language: ZH-CN">
CUSTOMVERTEX {<o:p></o:p></SPAN></P>
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lang=EN-US
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-fareast-language: ZH-CN"><SPAN
style="mso-spacerun: yes">
</SPAN>FLOAT x, y, z;<o:p></o:p></SPAN></P>
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lang=EN-US
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-fareast-language: ZH-CN"><SPAN
style="mso-spacerun: yes">
</SPAN>FLOAT rhw;<o:p></o:p></SPAN></P>
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lang=EN-US
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-fareast-language: ZH-CN"><SPAN
style="mso-spacerun: yes">
</SPAN>DWORD color;<o:p></o:p></SPAN></P>
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lang=EN-US
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-fareast-language: ZH-CN"><SPAN
style="mso-spacerun: yes">
</SPAN>FLOAT tu, tv;<SPAN style="mso-spacerun: yes"> </SPAN><SPAN
style="COLOR: blue">//</SPAN><SPAN style="COLOR: green">
纹理坐标</SPAN><o:p></o:p></SPAN></P>
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lang=EN-US
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-fareast-language: ZH-CN">};<o:p></o:p></SPAN></P>
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lang=EN-US
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