SetExternalShader Method

In This Topic

An external DirectX pixel shader to be used for custom filtering

Syntax

Visual Basic
C#
C++/CLI

'Declaration
 
Public Sub SetExternalShader( _
   ByVal code() As Byte _
)

'Usage
 
Dim instance As DicomImage
Dim code() As Byte
 
instance.SetExternalShader(code)

public void SetExternalShader( 
   byte[] code
)

public:
void SetExternalShader( 
   array<byte>^ code
)

Parameters

code: A precompiled pixel shader, or null to remove the existing shader

Remarks

This is an advanced technique, and those intending to use it should contact us for guidance

To remove the shader, use this method again, with a null parameter

Example

A sample (in this case a simple Sobel) filter would be like this:

HLSL

// The 3D data
MyTexture2D<float> ShaderTextureFloat: register(t0);
            
// A simple Sampler
SamplerState Sampler : register(s0);
            
struct VertexShaderOutput
{
    // The calculated position in the texture (0..1) space
    float4 Position : SV_Position;
            
    //The position of the pixel in X,Y integers
    float2 TextureUV : TEXCOORD0;
};
            
float main(VertexShaderOutput input) : SV_Target
{
    float2 pos = input.TextureUV;
            
    // simplified Sobel filter 
            
    float x0 = ShaderTextureFloat.SampleLevel(Sampler, pos - ddx(pos), 0);
    float x1 = ShaderTextureFloat.SampleLevel(Sampler, pos + ddx(pos), 0);
    float y0 = ShaderTextureFloat.SampleLevel(Sampler, pos - ddy(pos), 0);
    float y1 = ShaderTextureFloat.SampleLevel(Sampler, pos + ddy(pos), 0);
	return sqrt((x1 - x0) * (x1 - x0) + (y1 - y0) * (y1 - y0));
}

Requirements

Target Platforms: .NET CLR 3.5 or higher

Reference

DicomImage Class
DicomImage Members

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