仿製shazzam的簡單功能，將hlsl轉換為WPF中的ShaderEffect
阿新 • • 發佈：2019-07-27
(此文章只是在對WPF的Effect產生興趣才稍微研究了一點後面的知識;需要了解更多可參考https://archive.codeplex.com/?p=shazzam的原始碼以及WPF基礎知識)
1.之前一直使用blend裡自帶的幾個特效，突然有一天比較好奇這些特效是怎麼來的。
然後就聽說了shazzam並看到更多的特效
2.在參考網址下載了shazzam的程式碼來研究研究，只抽取出裡面【如何將.fx檔案編譯為.ps，再產生一個呼叫.ps檔案的.cs檔案,然後就可以像正常使用其它自帶Effect一樣使用了】這一過程
3.HLSL語法網上有很多教程啊，目前就直接拿一些寫好的來用就行，一個簡單的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將.fx檔案轉換為.ps檔案
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檔案的effect.cs檔案
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檔案內容如下：
//------------------------------------------------------------------------------
// <auto-generated>
// 此程式碼由工具生成。
// 執行時版本:4.0.30319.42000
//
// 對此檔案的更改可能會導致不正確的行為，並且如果
// 重新生成程式碼，這些更改將會丟失。
// </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);
}
}
}
}
ToonShaderEffect : ShaderEffect
6.ShaderPanTest：測試功能--運用C#動態編譯生成來使用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;
}
CompileInMemory(string code)
7.原始碼： https://github.com/lenkasetGitHub/Song_WPF_PixelShader （exe圖示來自easyico