CODEWITHSUNDEEP
wpfshader
NickLokarno
NickLokarno

Reputation: 310

WPF trying to use pixelshader to disable certain channels

I'm trying to use a pixel shader to disable specific channels on an image. Unfortunately, I can't seem to get my shader to work, nor do I know how to do step-through debugging on this. I've tried PIX for windows, but haven't gotten any success with that tool.

Here's my shader file: ChannelEffect .fx

sampler2D implicitInputSampler : register(S0);

float4 main(float2 uv : TEXCOORD) : COLOR
{
// Get the source color
float4 color = tex2D(implicitInputSampler, uv);


color.g = 0.0f;
color.b = 0.0f;
// Return new color
return color;
}

Right now I'm hard-coding the channels I'm disabling, just to test it. This sample should make only the red channel appear.

            ChannelEffect channelEffect = GetChannelEffect(displayChannel);
            image.Effect = channelEffect;


            dc.DrawImage(image.Source, destRect);

The end result I get is that the image renders as normal. Its as if I'm not even applying a shader at all. Any ideas?

Upvotes: 0

Views: 171

Answers (1)

Nicros
Nicros

Reputation: 5183

I was doing something similar- and found Shazzam which is a fantastic program that not only will allow you to tweak and twiddle with shaders but will even generate code for you. I didn't use that code myself, but it gives a great example on how to use shaders with C# and XAML.

You can even import your own images to test with until you get your shader code exactly right.

Upvotes: 1

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