状态.htm

此文件是微软MSDN中d3d部分资料的翻译文件

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如果不支持比较，那么就照常渲染。唯一的缺点是没有性能上的提升。</SPAN><SPAN lang=EN-US 
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<P class=MsoNormal 
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style="FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-fareast-language: ZH-CN">并不是所有的硬件都支持全部阿尔法测试特性。可以通过调用<U><SPAN 
lang=EN-US>IDirect3D9::GetDeviceCaps</SPAN></U>方法检查设备能力，取回设备能力后，根据希望使用的比较函数检查相关<U><SPAN 
lang=EN-US>D3DCAPS9</SPAN></U>结构的<B style="mso-bidi-font-weight: normal"><SPAN 
lang=EN-US>AlphaCmpCaps</SPAN></B>成员。如果<B 
style="mso-bidi-font-weight: normal"><SPAN 
lang=EN-US>AlphaCmpCaps</SPAN></B>成员只包含<SPAN 
lang=EN-US>D3DPCMPCAPS_ALWAYS能力或D3DPCMPCAPS_NEVER能力，那么驱动程序不支持阿尔法测试。<o:p></o:p></SPAN></SPAN></P>
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<P class=MsoNormal 
style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto; mso-outline-level: 1"><A 
name=环境光状态><B><SPAN 
style="FONT-SIZE: 24pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 18.0pt; mso-fareast-language: ZH-CN">环境光状态<SPAN 
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<P>环境光是周围的光，从各个方向照射而来。</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">有关<SPAN 
lang=EN-US>Microsoft&reg; 
Direct3D&reg;如何使用环境光的信息，请参阅<U>直射光与环境光</U>，和<U>与光照相关的数学</U>。<o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal 
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style="FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-fareast-language: ZH-CN">C++应用程序调用<U>IDirect3DDevice9::SetRenderState</U>方法设置环境光的颜色，并将D3DRS_AMBIENT枚举类型值作为第一个参数传入。第二个参数是颜色值，默认值为零。<o:p></o:p></SPAN></P>
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本例假设d3dDevice为指向IDirect3DDevice9接口的有效指针。</SPAN><SPAN lang=EN-US 
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设置环境光</SPAN><SPAN lang=EN-US 
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<P class=MsoNormal 
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style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-fareast-language: ZH-CN">d3dDevice-&gt;<SPAN 
class=GramE>SetRenderState(</SPAN>D3DRS_AMBIENT, 
0x00202020);<o:p></o:p></SPAN></P>
<DIV class=MsoNormal style="TEXT-ALIGN: center" align=center><SPAN lang=EN-US 
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<P class=MsoNormal 
style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto; mso-outline-level: 1"><A 
name=抗锯齿状态><B><SPAN 
style="FONT-SIZE: 24pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 18.0pt; mso-fareast-language: ZH-CN">抗锯齿状态<SPAN 
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<DIV class=MsoNormal style="TEXT-ALIGN: center" align=center><SPAN lang=EN-US 
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<P class=MsoNormal 
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style="FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-fareast-language: ZH-CN">抗锯齿是使屏幕上的线和边缘看起来更为平滑的一种方法。<SPAN 
lang=EN-US>Microsoft&reg; 
Direct3D&reg;支持两种抗锯齿方法：边缘抗锯齿和全屏抗锯齿。<o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal 
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style="FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-fareast-language: ZH-CN">有关这些技术的更多细节，请参阅<U>抗锯齿</U>。<SPAN 
lang=EN-US><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">默认情况下，<SPAN 
lang=EN-US>Direct3D不执行抗锯齿。边缘抗锯齿需要渲染第二遍，要启用边缘抗锯齿，应该把<U>D3DRS_EDGEANTIALIAS</U>渲染状态设置为TRUE，要禁用边缘抗锯齿，应该把<U>D3DRS_EDGEANTIALIAS</U>设置为FALSE。<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">要启用全屏抗锯齿，应该把<B 
style="mso-bidi-font-weight: normal"><SPAN 
lang=EN-US>D3DRS_MULTISAMPLEANTIALIAS</SPAN></B>渲染状态设置为<SPAN 
lang=EN-US>TRUE。要禁用全屏抗锯齿，应该把D3DRS_MULTISAMPLEANTIALIAS设置为FALSE。<o:p></o:p></SPAN></SPAN></P>
<DIV class=MsoNormal style="TEXT-ALIGN: center" align=center><SPAN lang=EN-US 
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<P class=MsoNormal 
style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto; mso-outline-level: 1"><A 
name=剔除状态><B><SPAN 
style="FONT-SIZE: 24pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 18.0pt; mso-fareast-language: ZH-CN">剔除状态<SPAN 
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<DIV class=MsoNormal style="TEXT-ALIGN: center" align=center><SPAN lang=EN-US 
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<P><SPAN lang=EN-US>Direct3D渲染图元时会剔除背向用户的图元。</SPAN></P>
<P class=MsoNormal 
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style="FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-fareast-language: ZH-CN">C++应用程序使用<U>D3DRS_CULLMODE</U>渲染状态设置剔除模式，它可以被设置为<U>D3DCULL</U>枚举类型的成员。默认情况下，Direct3D把顶点逆时针排列的面作为背向面剔除。<o:p></o:p></SPAN></P>
<P class=MsoNormal 
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style="FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-fareast-language: ZH-CN">以下示例代码描述了设置剔除模式的过程，这里把顶点顺时针排列的面作为背向面剔除。<SPAN 
lang=EN-US><o:p></o:p></SPAN></SPAN></P>
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本例假设d3dDevice为指向IDirect3DDevice9接口的有效指针。</SPAN><SPAN lang=EN-US 
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设置剔除状态。</SPAN><SPAN lang=EN-US 
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<P class=MsoNormal 
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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">d3dDevice-&gt;<SPAN 
class=GramE>SetRenderState(</SPAN>D3DRS_CULLMODE, 
D3DCULL_CW);<o:p></o:p></SPAN></P>
<DIV class=MsoNormal style="TEXT-ALIGN: center" align=center><SPAN lang=EN-US 
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<P class=MsoNormal 
style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto; mso-outline-level: 1"><A 
name=深度缓存状态><B><SPAN 
style="FONT-SIZE: 24pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 18.0pt; mso-fareast-language: ZH-CN">深度缓存状态<SPAN 
lang=EN-US><o:p></o:p></SPAN></SPAN></B></A></P><SPAN 
style="mso-bookmark: 深度缓存状态"></SPAN>
<DIV class=MsoNormal style="TEXT-ALIGN: center" align=center><SPAN lang=EN-US 
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<P>深度缓存是消除隐藏线和隐藏面的一种方法。默认的情况下，<SPAN lang=EN-US>Direct3D不使用深度缓存。</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">有关深度缓存的概念，请参阅<U>深度缓存</U>。<SPAN 
lang=EN-US><o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal 
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style="FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-fareast-language: ZH-CN">C++应用程序用<U>D3DRS_ZENABLE</U>渲染状态更新深度缓存的状态，用<U>D3DZBUFFERTYPE</U>枚举类型成员指定新的状态值。<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">若应用程序要阻止<SPAN 
lang=EN-US>Direct3D写入深度缓存，则可在调用<U>IDirect3DDevice9::SetRenderState</U>时用<U>D3DRS_ZWRITEENABLE</U>枚举类型作为第一个参数，并将第二个参数指定为D3DZB_FALSE。<o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal 
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style="FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-fareast-language: ZH-CN">以下示例代码显示了如何将深度缓存状态设置为启用<SPAN 
lang=EN-US>z缓存。<o:p></o:p></SPAN></SPAN></P>
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