仿制shazzam的简单功能，将hlsl转换为WPF中的ShaderEffect

(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></minValue>

/// <maxValue></maxValue>

/// <defaultValue></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;

}

ToonShader

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 = ;

        ID3DXBuffer ppShader2;

        ID3DXBuffer ppErrorMsgs2;

        if (!useDx10)

        {

            hr2 = ((IntPtr.Size != ) ?

                DxHelper.D3DXCompileShader(codeText, codeText.Length, defines, includes, methodName, targetProfile2, , out ppShader2, out ppErrorMsgs2, out ppConstantTable)

                :

                DxHelper.D3DXCompileShader64Bit(codeText, codeText.Length, defines, includes, methodName, targetProfile2, , out ppShader2, out ppErrorMsgs2, out ppConstantTable));

        }

        else

        {

            int pHr = ;

            hr2 = DxHelper.D3DX10CompileFromMemory(codeText, codeText.Length, string.Empty, IntPtr.Zero, IntPtr.Zero, methodName, targetProfile2, , , IntPtr.Zero, out ppShader2, out ppErrorMsgs2, ref pHr);

        }

        if (hr2 != )

        {

            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, , compiledPs.Length);

            using (FileStream psFile = File.Open(psPath, FileMode.Create, FileAccess.Write))

            {

                psFile.Write(compiledPs, , compiledPs.Length);

            }

        }

        if (ppShader2 != null)

        {

            Marshal.ReleaseComObject(ppShader2);

        }

        ppShader2 = null;

        if (ppErrorMsgs2 != null)

        {

            Marshal.ReleaseComObject(ppErrorMsgs2);

        }

        ppErrorMsgs2 = null;

        CompileFinished();

    }

Compile(string codeText, string output, string fxName, ShaderProfile shaderProfile)

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;

        }

    }

GenerateCode(CodeDomProvider provider, CodeCompileUnit compileUnit)

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), );

        public static readonly DependencyProperty LevelsProperty = DependencyProperty.Register("Levels", typeof(double), typeof(ToonShaderEffect), new UIPropertyMetadata(((double)(5D)), PixelShaderConstantCallback()));

        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);

            }

        }

    }

}

ToonShaderEffect : ShaderEffect

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 == )

            return results.CompiledAssembly;

        else

            return null;

    }

CompileInMemory(string code)

7.源码： https://github.com/lenkasetGitHub/Song_WPF_PixelShader （exe图标来自easyicon）

https://gitee.com/github-19276270/Song_WPF_PixelShader

巴特西

仿制shazzam的简单功能，将hlsl转换为WPF中的ShaderEffect

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