例子

索引

二分网格

使用ceil
0-1移动定义域到-0.5 - 0.5，然后向上取整变成 0 / 1

float4 main(float2 uv : TEXCOORD) : COLOR
{
float ab = ceil( uv.y-0.5 );
return float4(ab,ab,ab,1.0);
}

4分网格

使用ceil
0-1，先放大定义域0-4，然后向左移动定义域，-0.5 - 3.5，向上取整 0/1/2/3，最后压缩0/0.25/0.5/0.75/1

float4 main(float2 uv : TEXCOORD) : COLOR
{
float ab = ceil( uv.y*4-0.5 );
float scale=ab/4;
return float4(scale,scale,scale,1.0);
}

二值化多分网格

使用sin round
利用周期函数把定义域0-1范围的周期调整到指定数，然后值域压扁-0.5 - 0.5，向上移动0-1，四舍五入二值化

//三角函数是天然的周期函数
float4 main(float2 uv : TEXCOORD) : COLOR
{
float num=6;
float2 ab = 0.5sin(uv3.1415*num )+0.5;
float2 scale=round(ab);
return float4(scale.y,scale.y,scale.y,1.0);
}

二值化方格

使用sin round abs
在上一篇基础上，相乘生成纵横条纹。但这形成十字条纹，为了产生交错条纹，就不能相乘，只能相加

float4 main(float2 uv : TEXCOORD) : COLOR
{
float num=7;
float abx = 0.5sin(uv.x3.1415num )+0.5;
float aby = 0.5sin(uv.y3.1415num )+0.5;
float scale=abs((round(abx)/2)+(round(aby)/2)-0.5);
//0.4是避免浮点数精度问题，否则直接用round(scale)
float scale2=ceil(scale-0.4);
return float4(scale2,scale2,scale2,1.0);
}

动态方格

使用sin round abs

///
time

/// <minValue>0</minValue>
/// <maxValue>100</maxValue>
/// <defaultValue>0</defaultValue>
float time : register(C0);
float4 main(float2 uv : TEXCOORD) : COLOR
{
float num=7;
float abx = 0.5sin(uv.x3.1415num+time )+0.5;
float aby = 0.5sin(uv.y3.1415num )+0.5;
float scale=abs((round(abx)/2)+(round(aby)/2)-0.5);
float scale2=ceil(scale-0.4);
return float4(scale2,scale2,scale2,1.0);
}

线框网格

使用sin abs max step

将周期函数取绝对值，变成一个个山峰，然后下沉，利用一个阈值，过滤出山尖

float4 main(float2 uv : TEXCOORD) : COLOR
{
float gridLines = 11;

  float gridLineX = step(0.99, abs(sin(uv.x * 3.1415 * gridLines))); 
  float gridLineY = step(0.99, abs(sin(uv.y * 3.1415 * gridLines))); 

  float4 color = float4(max(gridLineX,gridLineY) , max(gridLineX,gridLineY) , max(gridLineX,gridLineY) , 1.0);

  return color;

}

线框网格上滚动的小球

使用sin abs max step

在前一篇基础上，再传入鼠标位置，并再鼠标周围画一个白色圆形，覆盖线框颜色设置。使用语义VPOS获取像素位置判断和鼠标距离

float2 mousePosition : register(C0);
float4 main(float2 uv : TEXCOORD,float2 positon : VPOS) : COLOR
{
float gridLines = 11;

  float gridLineX = step(0.99, abs(sin(uv.x * 3.1415 * gridLines))); 
  float gridLineY = step(0.99, abs(sin(uv.y * 3.1415 * gridLines)));
  float maxline=max(gridLineX,gridLineY);
  
  float innerCircle = 1.0 - step(50,length(positon-mousePosition));
  float maxResult=max(maxline,innerCircle);

  float4 color = float4(maxResult , maxResult , maxResult , 1.0);

  return color;

}

鼠标操控小球

public class MouseCaptureEffect : ShaderEffect
{
    public static readonly DependencyProperty InputProperty = ShaderEffect.RegisterPixelShaderSamplerProperty("Input", typeof(MouseCaptureEffect), 0);
    public static readonly DependencyProperty MousePositionProperty = DependencyProperty.Register("MousePosition", typeof(Point), typeof(MouseCaptureEffect), new UIPropertyMetadata(new Point(0D, 0D), PixelShaderConstantCallback(0)));
    public MouseCaptureEffect()
    {
        PixelShader pixelShader = new PixelShader();
        pixelShader.UriSource = new Uri("pack://application:,,,/你的程序集名称;component/路径/TextEffect3.ps", UriKind.Absolute);
        this.PixelShader = pixelShader;

        this.UpdateShaderValue(InputProperty);
        this.UpdateShaderValue(MousePositionProperty);
    }
    public Brush Input
    {
        get
        {
            return ((Brush)(this.GetValue(InputProperty)));
        }
        set
        {
            this.SetValue(InputProperty, value);
        }
    }
    /// <summary> mouse </summary>
    public Point MousePosition
    {
        get
        {
            return ((Point)(this.GetValue(MousePositionProperty)));
        }
        set
        {
            this.SetValue(MousePositionProperty, value);
            Debug.WriteLine("aaa");
        }
    }
}

<Button Content="Btn">
    <Button.Effect>
        <local:MouseCaptureEffect x:Name="me" MousePosition="{Binding MousePositionw,Mode=TwoWay}" >
        </local:MouseCaptureEffect>
    </Button.Effect>
</Button>

this.MouseMove += (sender, e) =>
{
    //这行代码不管用
    //MousePositionw = e.GetPosition(this);
    // 更新鼠标位置
    me.MousePosition= MousePositionw;
};

要注意的时，通过绑定的方式更新没成功，只好手动赋值，不知道哪里出问题了

WPF网格类型像素着色器

例子

索引