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Problem sending vertex data to shader


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#1 simpler   Members   -  Reputation: 913

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Posted 23 September 2012 - 05:28 PM

For some reason the vertex data wont be transfered correctly from the vertex buffer to the vertex shader.

This is the c++ vertex structure:

//! Vertex with skinning info.
struct SkinnedVertex
{
XMFLOAT3 Pos;
XMFLOAT3 Normal;
XMFLOAT2 Tex;
XMFLOAT4 Tangent;
XMFLOAT3 Weights;
BYTE BoneIndices[4];
};

This is the HLSL structure:

//! Input vertex data.
struct SkinnedVertexIn
{
float3 PosL	   : POSITION;
float3 NormalL	: NORMAL;
float2 Tex		: TEXCOORD;
float4 TangentL   : TANGENT;
float3 Weights	: WEIGHTS;
uint4 BoneIndices : BONEINDICES;
};

And this is the input layout:

// Create the vertex input layout.
D3D11_INPUT_ELEMENT_DESC vertexDesc[6] =
{
  {"POSITION",	 0, DXGI_FORMAT_R32G32B32_FLOAT, 0, 0,  D3D11_INPUT_PER_VERTEX_DATA, 0},
  {"NORMAL",	   0, DXGI_FORMAT_R32G32B32_FLOAT, 0, 12, D3D11_INPUT_PER_VERTEX_DATA, 0},
  {"TEXCOORD",	 0, DXGI_FORMAT_R32G32_FLOAT,	0, 24, D3D11_INPUT_PER_VERTEX_DATA, 0},
  {"TANGENT",	  0, DXGI_FORMAT_R32G32B32A32_FLOAT, 0, 32, D3D11_INPUT_PER_VERTEX_DATA, 0},
  {"WEIGHTS",	  0, DXGI_FORMAT_R32G32B32_FLOAT, 0, 48, D3D11_INPUT_PER_VERTEX_DATA, 0},
  {"BONEINDICES",  0, DXGI_FORMAT_R8G8B8A8_UINT,   0, 60, D3D11_INPUT_PER_VERTEX_DATA, 0}
};
// Create the input layout.
	D3DX11_PASS_DESC passDesc;
	mTech->GetPassByIndex(0)->GetDesc(&passDesc);
HR(gGame->GetD3D()->GetDevice()->CreateInputLayout(vertexDesc, 6, passDesc.pIAInputSignature,
  passDesc.IAInputSignatureSize, &mInputLayout));

This is what it looks like in PIX:

Posted Image

As you can see the position, normal, texcoord and tangent are transfered correctly. But the weights and bone indices are totally wrong. I have no idea why and I have realised I won't be able to solve this on my own, I really appreciate any help. Also, it seems kinda weird that the tangent is shown as a float3 in PIX when it's acctually a float4.

If you need more information in order to help let me know. Thanks!

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#2 Nik02   Crossbones+   -  Reputation: 2832

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Posted 24 September 2012 - 12:56 AM

DXGI_FORMAT_R8G8B8A8_UINT is not equal to uint4.

Niko Suni


#3 simpler   Members   -  Reputation: 913

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Posted 25 September 2012 - 11:42 AM

I didn't know that. What format should I use instead? But I don't understand how that can affect and make the weights data wrong as well. Perhaps you can explain?

Edited by simpler, 25 September 2012 - 11:42 AM.


#4 kauna   Crossbones+   -  Reputation: 2510

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Posted 25 September 2012 - 02:40 PM

DXGI_FORMAT_R8G8B8A8_UINT is not equal to uint4.


Strange, I use exactly the same setup and it works for me. Except for the weights I use just one dword, since the values are between 0..1 and 8-bit accuracy is enough.

I use DXGI_FORMAT_R8G8B8A8_UINT in the input layout and uint4 in the hlsl vertex structure.
Otherwise, I store the bone indices in a dword but that's same as 4 bytes.

You can use D3D11_APPEND_ALIGNED_ELEMENT instead of calculating the offsets yourself.

Cheers!

Edited by kauna, 25 September 2012 - 06:15 PM.


#5 MJP   Moderators   -  Reputation: 11352

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Posted 25 September 2012 - 03:53 PM

DXGI_FORMAT_R8G8B8A8_UINT is not equal to uint4.


That's not true. The UINT suffix specifies that each component should be interpreted as an 8-bit unsigned integer, and there are 4 values so uint4 is the appropriate type to use in this case.




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