(此文章只是在对wpf的effect产生兴趣才稍微研究了一点后面的知识;需要了解更多可参考https://archive.codeplex.com/?p=shazzam的源代码以及wpf基础知识)
1.之前一直使用blend里自带的几个特效，突然有一天比较好奇这些特效是怎么来的。
然后就听说了shazzam并看到更多的特效
2.在参考网址下载了shazzam的代码来研究研究，只抽取出里面【如何将.fx文件编译为.ps，再产生一个调用.ps文件的.cs文件,然后就可以像正常使用其它自带effect一样使用了】这一过程
3.hlsl语法网上有很多教程啊，目前就直接拿一些写好的来用就行，一个简单的toonshader.fx
/// <description>an effect that applies cartoon-like shading (posterization).</description>
sampler2d inputsampler : register(s0);
//-----------------------------------------------------------------------------------------
// shader constant register mappings (scalars - float, double, point, color, point3d, etc.)
//-----------------------------------------------------------------------------------------
/// <summary>the number of color levels to use.</summary>
/// <minvalue>3</minvalue>
/// <maxvalue>15</maxvalue>
/// <defaultvalue>5</defaultvalue>
float levels : register(c0);
float4 main(float2 uv : texcoord) : color
{
float4 color = tex2d( inputsampler, uv );
color.rgb /= color.a;
int levels = floor(levels);
color.rgb *= levels;
color.rgb = floor(color.rgb);
color.rgb /= levels;
color.rgb *= color.a;
return color;
}
4.shadercompiler：利用dxd的d3dxcompileshader将.fx文件转换为.ps文件
public void compile(string codetext, string output, string fxname, shaderprofile shaderprofile = shaderprofile.ps_2_0)
{
iscompiled = false;
string path = output;
intptr defines = intptr.zero;
intptr includes = intptr.zero;
intptr ppconstanttable = intptr.zero;
string methodname = "main";
string targetprofile2 = "ps_2_0";
targetprofile2 = ((shaderprofile != shaderprofile.ps_3_0) ? "ps_2_0" : "ps_3_0");
bool usedx10 = false;
int hr2 = 0;
id3dxbuffer ppshader2;
id3dxbuffer pperrormsgs2;
if (!usedx10)
{
hr2 = ((intptr.size != 8) ?
dxhelper.d3dxcompileshader(codetext, codetext.length, defines, includes, methodname, targetprofile2, 0, out ppshader2, out pperrormsgs2, out ppconstanttable)
:
dxhelper.d3dxcompileshader64bit(codetext, codetext.length, defines, includes, methodname, targetprofile2, 0, out ppshader2, out pperrormsgs2, out ppconstanttable));
}
else
{
int phr = 0;
hr2 = dxhelper.d3dx10compilefrommemory(codetext, codetext.length, string.empty, intptr.zero, intptr.zero, methodname, targetprofile2, 0, 0, intptr.zero, out ppshader2, out pperrormsgs2, ref phr);
}
if (hr2 != 0)
{
intptr errors = pperrormsgs2.getbufferpointer();
pperrormsgs2.getbuffersize();
errortext = marshal.ptrtostringansi(errors);
iscompiled = false;
}
else
{
errortext = "";
iscompiled = true;
string pspath = path + fxname;
intptr pcompiledps = ppshader2.getbufferpointer();
int compiledpssize = ppshader2.getbuffersize();
byte[] compiledps = new byte[compiledpssize];
marshal.copy(pcompiledps, compiledps, 0, compiledps.length);
using (filestream psfile = file.open(pspath, filemode.create, fileaccess.write))
{
psfile.write(compiledps, 0, compiledps.length);
}
}
if (ppshader2 != null)
{
marshal.releasecomobject(ppshader2);
}
ppshader2 = null;
if (pperrormsgs2 != null)
{
marshal.releasecomobject(pperrormsgs2);
}
pperrormsgs2 = null;
compilefinished();
}
5.codegenerator：生成引用.ps文件的effect.cs文件
private static string generatecode(codedomprovider provider, codecompileunit compileunit)
{
// generate source code using the code generator.
using (stringwriter writer = new stringwriter())
{
string indentstring = indentusingtabs ? "\t" : string.format("{0," + indentspaces.tostring() + "}", " ");
codegeneratoroptions options = new codegeneratoroptions { indentstring = indentstring, blanklinesbetweenmembers = true, bracingstyle = "c" };
provider.generatecodefromcompileunit(compileunit, writer, options);
string text = writer.tostring();
// fix up code: make static dp fields readonly, and use triple-slash or triple-quote comments for xml doc comments.
if (provider.fileextension == "cs")
{
text = text.replace("public static dependencyproperty", "public static readonly dependencyproperty");
text = regex.replace(text, @"// <(?!/?auto-generated)", @"/// <");
}
else
if (provider.fileextension == "vb")
{
text = text.replace("public shared ", "public shared readonly ");
text = text.replace("'<", "'''<");
}
return text;
}
}
生成的cs文件内容如下：
//------------------------------------------------------------------------------
// <auto-generated>
// 此代码由工具生成。
// 运行时版本:4.0.30319.42000
//
// 对此文件的更改可能会导致不正确的行为，并且如果
// 重新生成代码，这些更改将会丢失。
// </auto-generated>
//------------------------------------------------------------------------------
using system;
using system.componentmodel;
using system.windows;
using system.windows.media;
using system.windows.media.effects;
using system.windows.media.media3d;
namespace shaderpan
{
/// <summary>an effect that applies cartoon-like shading (posterization).</summary>
public class toonshadereffect : shadereffect
{
public static readonly dependencyproperty inputproperty = shadereffect.registerpixelshadersamplerproperty("input", typeof(toonshadereffect), 0);
public static readonly dependencyproperty levelsproperty = dependencyproperty.register("levels", typeof(double), typeof(toonshadereffect), new uipropertymetadata(((double)(5d)), pixelshaderconstantcallback(0)));
public toonshadereffect()
{
pixelshader pixelshader = new pixelshader();
pixelshader.urisource = new uri("c:\\users\\administrator\\desktop\\wpftpl\\shader\\toonshader.ps", urikind.absolute);
this.pixelshader = pixelshader;
this.updateshadervalue(inputproperty);
this.updateshadervalue(levelsproperty);
}
public brush input
{
get
{
return ((brush)(this.getvalue(inputproperty)));
}
set
{
this.setvalue(inputproperty, value);
}
}
/// <summary>the number of color levels to use.</summary>
public double levels
{
get
{
return ((double)(this.getvalue(levelsproperty)));
}
set
{
this.setvalue(levelsproperty, value);
}
}
}
}
6.shaderpantest：测试功能–运用c#动态编译生成来使用effect
public static assembly compileinmemory(string code)
{
var provider = new csharpcodeprovider(new dictionary<string, string>() { { "compilerversion", "v4.0" } });
compilerparameters options = new compilerparameters();
options.referencedassemblies.add("system.dll");
options.referencedassemblies.add("system.core.dll");
options.referencedassemblies.add("windowsbase.dll");
options.referencedassemblies.add("presentationframework.dll");
options.referencedassemblies.add("presentationcore.dll");
options.includedebuginformation = false;
options.generateexecutable = false;
options.generateinmemory = true;
compilerresults results = provider.compileassemblyfromsource(options, code);
provider.dispose();
if (results.errors.count == 0)
return results.compiledassembly;
else
return null;
}
7.源码： https://github.com/lenkasetgithub/song_wpf_pixelshader （exe图标来自easyicon）
黄山市民网：https://www.huangshanshimin.com/
