I'm using D3DX11CreateShaderResourceViewFromFile in conjunction with D3DX11GetImageInfoFromFile to load the textures. I doubled checked and the dds file in question is certainly BC5_SNORM and not BC5_UNORM.
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Incorrect value range when sampling BC5_SNORM texture
Started by Chris_F, Mar 15 2012 11:09 AM
7 replies to this topic
#1 Members - Reputation: 745
Posted 15 March 2012 - 11:09 AM
The problem I'm having is that when I load a R8G8B8A8_SNORM encoded dds texture and sample it in my shader, it gives me values in the [-1, 1] range as I would expect. But, If I load the same normal map that was encoded as BC5_SNORM and sample it, it gives me values in the [0, 1] range.
I'm using D3DX11CreateShaderResourceViewFromFile in conjunction with D3DX11GetImageInfoFromFile to load the textures. I doubled checked and the dds file in question is certainly BC5_SNORM and not BC5_UNORM.
I'm using D3DX11CreateShaderResourceViewFromFile in conjunction with D3DX11GetImageInfoFromFile to load the textures. I doubled checked and the dds file in question is certainly BC5_SNORM and not BC5_UNORM.
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#2 Members - Reputation: 280
Posted 15 March 2012 - 12:27 PM
I would use PIX and sample some pixels to see if the error is in loading of the texture or if the sampling don't know what format it is stored in.
My open source DirectX 10/11 graphics engine. https://sites.google.com/site/dawoodoz
"My design pattern is the simplest to understand. Everyone else is just too stupid to understand it."
#3 Members - Reputation: 745
Posted 15 March 2012 - 12:41 PM
I loaded it in pix. The first normal map shows as R8G8B8A8_SNORM and the second shows as BC5_SNORM. In my pixel shader the first returns [-1, 1] and the second [0, 1], such that:
Normal1.Sample(linearSampler, input.texcoord).xy
and
Normal2.Sample(linearSampler, input.texcoord).xy * 2 - 1
return the same value.
Normal1.Sample(linearSampler, input.texcoord).xy
and
Normal2.Sample(linearSampler, input.texcoord).xy * 2 - 1
return the same value.
#4 Members - Reputation: 280
Posted 15 March 2012 - 02:02 PM
Could you find a pixel with negative values on the BC5_SNORM image in PIX?
My open source DirectX 10/11 graphics engine. https://sites.google.com/site/dawoodoz
"My design pattern is the simplest to understand. Everyone else is just too stupid to understand it."
#6 Members - Reputation: 280
Posted 16 March 2012 - 08:17 AM
Then I would check Format in pLoadInfo given to D3DX11CreateShaderResourceViewFromFile.
My open source DirectX 10/11 graphics engine. https://sites.google.com/site/dawoodoz
"My design pattern is the simplest to understand. Everyone else is just too stupid to understand it."
