📄 像素着色器 (pixel shaders).htm
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lang=EN-US
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声明顶点位置和漫反射色数据。<o:p></o:p></SPAN></P>
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lang=EN-US
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-fareast-language: ZH-CN; mso-bidi-font-family: 宋体">CUSTOMVERTEX
g_Vertices[]=<o:p></o:p></SPAN></P>
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lang=EN-US
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-fareast-language: ZH-CN; mso-bidi-font-family: 宋体">{<o:p></o:p></SPAN></P>
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lang=EN-US
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-fareast-language: ZH-CN; mso-bidi-font-family: 宋体">//<SPAN
style="mso-spacerun: yes"> </SPAN>x<SPAN
style="mso-spacerun: yes"> </SPAN>y<SPAN
style="mso-spacerun: yes"> </SPAN>z<SPAN
style="mso-spacerun: yes"> </SPAN>漫反射色<o:p></o:p></SPAN></P>
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lang=EN-US
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-fareast-language: ZH-CN; mso-bidi-font-family: 宋体"><SPAN
style="mso-spacerun: yes"> </SPAN>{ -1.0f, -1.0f, 0.0f,
0xffff0000 },<SPAN style="mso-spacerun: yes"> </SPAN>// 红 –
左下<o:p></o:p></SPAN></P>
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lang=EN-US
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-fareast-language: ZH-CN; mso-bidi-font-family: 宋体"><SPAN
style="mso-spacerun: yes"> </SPAN>{ +1.0f, -1.0f, 0.0f,
0xff00ff00 },<SPAN style="mso-spacerun: yes"> </SPAN>// 绿 –
右下<o:p></o:p></SPAN></P>
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lang=EN-US
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-fareast-language: ZH-CN; mso-bidi-font-family: 宋体"><SPAN
style="mso-spacerun: yes"> </SPAN>{ +1.0f, +1.0f, 0.0f,
0xff0000ff },<SPAN style="mso-spacerun: yes"> </SPAN>// 蓝 –
右上<o:p></o:p></SPAN></P>
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lang=EN-US
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-fareast-language: ZH-CN; mso-bidi-font-family: 宋体"><SPAN
style="mso-spacerun: yes"> </SPAN>{ -1.0f, +1.0f, 0.0f,
0xffffffff },<SPAN style="mso-spacerun: yes"> </SPAN>// 白 –
左上<o:p></o:p></SPAN></P>
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lang=EN-US
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-fareast-language: ZH-CN; mso-bidi-font-family: 宋体">};<o:p></o:p></SPAN></P>
<H2><SPAN style="mso-fareast-language: ZH-CN">第<SPAN
lang=EN-US>3步<o:p></o:p></SPAN></SPAN></H2>
<P><SPAN
style="mso-fareast-language: ZH-CN">这个着色器把经过高洛德插值的漫反射色数据复制到输出像素。着色器文件<SPAN
lang=EN-US>PixelShader.txt如下所示：<o:p></o:p></SPAN></SPAN></P>
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lang=EN-US
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-fareast-language: ZH-CN; mso-bidi-font-family: 宋体">ps_1_1<SPAN
style="mso-spacerun: yes">
</SPAN><SPAN style="COLOR: blue">//</SPAN><SPAN style="COLOR: green">
版本指令</SPAN><o:p></o:p></SPAN></P>
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lang=EN-US
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-fareast-language: ZH-CN; mso-bidi-font-family: 宋体">mov
r0,v0<SPAN style="mso-spacerun: yes"> </SPAN><SPAN
style="COLOR: blue">//</SPAN><SPAN style="COLOR: green">
把顶点的漫反射色复制到输出寄存器。</SPAN><o:p></o:p></SPAN></P>
<P><SPAN style="mso-fareast-language: ZH-CN">像素着色器文件的第一条指令声明了像素着色器的版本，此处为<SPAN
lang=EN-US>1.1。<o:p></o:p></SPAN></SPAN></P>
<P><SPAN style="mso-fareast-language: ZH-CN">第二条指令把颜色寄存器<SPAN
lang=EN-US>(v0)的内容复制到输出寄存器(r0)。因为在第1步中声明的顶点数据已经包含了经过插值的漫反射色，所以颜色寄存器包含了顶点的漫反射色。输出寄存器决定渲染目标使用的像素颜色（因为本例中没有更多的处理，如雾，所以输出寄存器就是最终的像素颜色）。<o:p></o:p></SPAN></SPAN></P>
<H2><A name=Step_4></A><SPAN style="mso-fareast-language: ZH-CN">第<SPAN
lang=EN-US>4步<o:p></o:p></SPAN></SPAN></H2>
<P><SPAN
style="mso-fareast-language: ZH-CN">像素着色器由像素着色器指令创建。本例中，指令被包含在一个单独的文件中。指令也可以被包含在一个文本字符串中。<SPAN
lang=EN-US><o:p></o:p></SPAN></SPAN></P>
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lang=EN-US
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-fareast-language: ZH-CN; mso-bidi-font-family: 宋体">LPD3DXBUFFER
pCode;<SPAN
style="mso-spacerun: yes">
</SPAN><SPAN style="COLOR: blue">//</SPAN><SPAN style="COLOR: green">
存放经过汇编的着色器代码的缓存</SPAN><o:p></o:p></SPAN></P>
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lang=EN-US
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-fareast-language: ZH-CN; mso-bidi-font-family: 宋体">LPD3DXBUFFER
pErrorMsgs;<SPAN
style="mso-spacerun: yes">
</SPAN><SPAN style="COLOR: blue">//</SPAN><SPAN style="COLOR: green">
存放错误信息的缓存</SPAN><o:p></o:p></SPAN></P>
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lang=EN-US
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-fareast-language: ZH-CN; mso-bidi-font-family: 宋体">TCHAR<SPAN
style="mso-spacerun: yes">
</SPAN>strPixelShaderPath[512];<SPAN style="COLOR: blue">//</SPAN><SPAN
style="COLOR: green"> 用来定位着色器文件</SPAN><o:p></o:p></SPAN></P>
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lang=EN-US
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-fareast-language: ZH-CN; mso-bidi-font-family: 宋体">DXUtil_FindMediaFileCb(
strPixelShaderPath, sizeof(strPixelShaderPath), <o:p></o:p></SPAN></P>
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lang=EN-US
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-fareast-language: ZH-CN; mso-bidi-font-family: 宋体"><SPAN
style="mso-spacerun: yes">
</SPAN>_T("PixelShader.txt") );<o:p></o:p></SPAN></P>
<P><SPAN style="mso-fareast-language: ZH-CN">这个函数是示例框架使用的一个辅助函数，许多示例都以它为基础。<SPAN
lang=EN-US><o:p></o:p></SPAN></SPAN></P>
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lang=EN-US
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-fareast-language: ZH-CN; mso-bidi-font-family: 宋体">LPDIRECT3DPIXELSHADER9
m_pPixelShader;<o:p></o:p></SPAN></P>
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lang=EN-US
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-fareast-language: ZH-CN; mso-bidi-font-family: 宋体">D3DXAssembleShaderFromFile(
strPixelShaderPath, NULL, NULL, 0,<SPAN style="mso-spacerun: yes">
</SPAN><o:p></o:p></SPAN></P>
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lang=EN-US
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-fareast-language: ZH-CN; mso-bidi-font-family: 宋体"><SPAN
style="mso-spacerun: yes">
</SPAN>&pCode, &pErrorMsgs, NULL );<SPAN
style="mso-spacerun: yes"> </SPAN><o:p></o:p></SPAN></P>
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lang=EN-US
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-fareast-language: ZH-CN; mso-bidi-font-family: 宋体">m_pd3dDevice->CreatePixelShader(
(DWORD*)pCode->GetBufferPointer(), <o:p></o:p></SPAN></P>
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lang=EN-US
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-fareast-language: ZH-CN; mso-bidi-font-family: 宋体"><SPAN
style="mso-spacerun: yes">
</SPAN><SPAN
style="mso-spacerun: yes"> </SPAN>&m_pPixelShader
);<o:p></o:p></SPAN></P>
<P><SPAN style="mso-fareast-language: ZH-CN">着色器创建完成后，指针<I><SPAN
lang=EN-US>m_pPixelShader</SPAN></I>用来对它进行引用。<SPAN
lang=EN-US><o:p></o:p></SPAN></SPAN></P>
<H2><A name=Step_5></A><SPAN style="mso-fareast-language: ZH-CN">第<SPAN
lang=EN-US>5步<o:p></o:p></SPAN></SPAN></H2>
<P><SPAN
style="mso-fareast-language: ZH-CN">除了用像素着色器句柄来设置着色器外，渲染输出像素的过程和使用固定功能流水线类似。<SPAN
lang=EN-US><o:p></o:p></SPAN></SPAN></P>
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lang=EN-US
style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: 宋体; mso-fareast-language: ZH-CN; mso-bidi-font-family: 宋体">//</SPAN><SPAN
lang=EN-US
style="FONT-SIZE: 10pt; COLOR: green; FONT-FAMILY: 宋体; mso-fareast-language: ZH-CN; mso-bidi-font-family: 宋体">
在本例中关闭关照。它不会对最终像素的颜色产生影响。</SPAN><SPAN lang=EN-US
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-fareast-language: ZH-CN; mso-bidi-font-family: 宋体"><o:p></o:p></SPAN></P>
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lang=EN-US
style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: 宋体; mso-fareast-language: ZH-CN; mso-bidi-font-family: 宋体">//</SPAN><SPAN
lang=EN-US
style="FONT-SIZE: 10pt; COLOR: green; FONT-FAMILY: 宋体; mso-fareast-language: ZH-CN; mso-bidi-font-family: 宋体">
像素颜色完全由经过插值的顶点颜色决定。</SPAN><SPAN lang=EN-US
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-fareast-language: ZH-CN; mso-bidi-font-family: 宋体"><o:p></o:p></SPAN></P>
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