VCS/ShaderEffectDemo - Sample is best!

開発環境	Microsoft Visual Studio Express 2013 for Windows Desktop
実行環境	Microsoft Windows 8.1 (64bit)
プロジェクトの種類	Visual C#／WPF アプリケーション
プロジェクト名	ShaderEffectDemo

以下のファイルをプロジェクトに追加する。

sample.jpg	任意の画像ファイル
ThresholdEffect.cs	クラス
ThresholdEffect.fx
ThresholdEffect.fx.ps	ビルド アクション：Resource

参考

• ShaderEffect クラス (System.Windows.Media.Effects)

MainWindow.xaml

<Window x:Class="ShaderEffectDemo.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:local="clr-namespace:ShaderEffectDemo"
        Title="MainWindow" Height="350" Width="525">
    <Window.Resources>
        <local:ThresholdEffect x:Key="thresholdEffect" Threshold="0.25" BlankColor="Orange" />
    </Window.Resources>
    <Grid Effect="{StaticResource thresholdEffect}">
        <Image Source="sample.jpg" />
    </Grid>
</Window>
 

MainWindow.xaml.cs

using System.Windows;
 
namespace ShaderEffectDemo
{
    /// <summary>
    /// MainWindow.xaml の相互作用ロジック
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }
    }
}
 

ThresholdEffect.cs

using System;
using System.Reflection;
using System.Windows;
using System.Windows.Media;
using System.Windows.Media.Effects;
 
namespace ShaderEffectDemo
{
    public class ThresholdEffect : ShaderEffect
    {
        private static PixelShader _pixelShader =
            new PixelShader() { UriSource = MakePackUri("ThresholdEffect.fx.ps")};
 
        public ThresholdEffect()
        {
            PixelShader = _pixelShader;
 
            UpdateShaderValue(InputProperty);
            UpdateShaderValue(ThresholdProperty);
            UpdateShaderValue(BlankColorProperty);
        }
 
        private static Uri MakePackUri(string relativeFile)
        {
            Assembly a = typeof(ThresholdEffect).Assembly;
 
            string assemblyShortName = a.ToString().Split(',')[0];
 
            string uriString = "pack://application:,,,/" +
                assemblyShortName +
                ";component/" +
                relativeFile;
 
            return new Uri(uriString);
        }
 
        //----------------------------------------------------------------------
        public Brush Input
        {
            get { return (Brush)GetValue(InputProperty); }
            set { SetValue(InputProperty, value); }
        }
 
        public static readonly DependencyProperty InputProperty =
            ShaderEffect.RegisterPixelShaderSamplerProperty("Input", typeof(ThresholdEffect), 0);
 
        //----------------------------------------------------------------------
        public double Threshold
        {
            get { return (double)GetValue(ThresholdProperty); }
            set { SetValue(ThresholdProperty, value); }
        }
 
        public static readonly DependencyProperty ThresholdProperty =
            DependencyProperty.Register("Threshold", typeof(double), typeof(ThresholdEffect),
            new UIPropertyMetadata(0.5, PixelShaderConstantCallback(0)));
 
        //----------------------------------------------------------------------
        public Color BlankColor
        {
            get { return (Color)GetValue(BlankColorProperty); }
            set { SetValue(BlankColorProperty, value); }
        }
 
        public static readonly DependencyProperty BlankColorProperty =
            DependencyProperty.Register("BlankColor", typeof(Color), typeof(ThresholdEffect),
            new UIPropertyMetadata(Colors.Transparent, PixelShaderConstantCallback(1)));
    }
}
 

ThresholdEffect.fx

sampler2D implicitInput : register(s0);
float threshold : register(c0);
float4 blankColor : register(c1);
 
float4 main(float2 uv : TEXCOORD) : COLOR
{
	float4 color = tex2D(implicitInput, uv);
	float intensity = (color.r + color.g + color.b) / 3;
 
	float4 result;
	if (intensity > threshold)
	{
		result = color;
	}
	else
	{
		result = blankColor;
	}
 
	return result;
}
 

makefx.bat

"C:\Program Files (x86)\Windows Kits\8.1\bin\x86\fxc.exe"^
 /T ps_2_0 /E main /Fo ThresholdEffect.fx.ps ThresholdEffect.fx
pause