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SquirrelPop

Interpolating data using sampling in a pixel shader

4 posts in this topic

I'm sending a array of data to the GPU (as a 1D texture) that I sample in my pixel shader. I use the data to draw a figure onto a quad in the PS. Everything's kosher until I zoom in. After getting very close, my figure is highly aliased with large stair-steps, even though I believe my sampler's filtering is set up correctly.
What part of the equation am I missing here? I appreciate the suggestions! The following code is SharpDX, but the important parts should be easy to read.
[source lang="csharp"]
Texture1DDescription textureDesc = new Texture1DDescription();
t1dDesc.ArraySize = 1;
t1dDesc.Usage = ResourceUsage.Immutable;
t1dDesc.Width = dataArray.Length;
t1dDesc.Format = Format.R32_Float;
t1dDesc.BindFlags = BindFlags.ShaderResource;
t1dDesc.CpuAccessFlags = CpuAccessFlags.None;
t1dDesc.OptionFlags = ResourceOptionFlags.None;
t1dDesc.MipLevels = 1;


DataStream ds = DataStream.Create(dataArray, false, false, false);
dataTexture = new Texture1D(d3dDevice, textureDesc, ds);
ds.Dispose();

this.dataTextureView = new ShaderResourceView(d3dDevice, dataTexture);

this.dataSampler = new SamplerState(d3dDevice, new SamplerStateDescription()
{
Filter = Filter.MinMagMipLinear,
AddressU = TextureAddressMode.Clamp,
AddressV = TextureAddressMode.Clamp,
AddressW = TextureAddressMode.Clamp
});[/source]

HLSL:
[source]
float4 PS(PixelShaderInput input) : SV_TARGET
{
float4 color = float4(0,0,0,0);
float dataValue = data.Sample(dataSampler, input.texcoord.x);
if(input.texcoord.y <= dataValue)
{
color = dataValue;
}

return color;
}[/source]

[attachment=9452:Awful.jpg] Edited by SquirrelPop
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I would run the executable from PIX to see step by step where things go wrong. I would start by confirming that the texture contain what I expect.
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Keep in mind that SamplerStateDescription (like in C++) is not initialized, so you should probably better set min/max lod...
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[quote name='xoofx' timestamp='1339643393' post='4949024']
Keep in mind that SamplerStateDescription (like in C++) is not initialized, so you should probably better set min/max lod...
[/quote]

I cut out those values to make the code paste shorter, but I do have them in there.
[source] ComparisonFunction = Comparison.Never,
MaximumAnisotropy = 16,
MipLodBias = 0,
MinimumLod = 0,
MaximumLod = 16[/source]

I didn't expect any difference, but I did try deleting them and I didn't see any effect, since I don't think those settings apply.
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[quote name='Dawoodoz' timestamp='1339621560' post='4948937']
I would run the executable from PIX to see step by step where things go wrong. I would start by confirming that the texture contain what I expect.
[/quote]

I will give that a shot. Visual Studio 12 doesn't seem to be able to do any graphics debugging when DX is embedded in a Metro app, which is what I am doing. I'll give PIX a shot, but I'm not hopeful. I will probably need to extract this from the Metro container and just do a vanilla DirectX version in order to use the tools.

Thank you.
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