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Writing to R16G16_UINT

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I have a little problem :)

I would like to write data into buffer with format :

				{"LODID",     0, DXGI_FORMAT_R16_UINT,     1, 4, D3D11_INPUT_PER_INSTANCE_DATA, 1 },

First stream has 4 bytes, second stream has 6 bytes.

So, i created buffers with that sized and i copied USHORT data into buffer.


When rendering, it says

D3D11 ERROR: ID3D11DeviceContext::DrawIndexedInstanced: Vertex Buffer Stride (6) at the input vertex slot 1 is not aligned properly. The current Input Layout imposes an alignment of (4) because of the Formats used with this slot. [ EXECUTION ERROR #367: DEVICE_DRAW_VERTEX_STRIDE_UNALIGNED]

Shader layout:

struct VIn
    uint2   position : POSITION0;
    uint2   instance : TPOSITION;
    uint    lodid    : LODID;

when i use 32bits , it's working fine. I also tried to use uint only and unpack two ushorts ( uints in hlsl ).

It's a pity, there are no ushorts in hlsl ;-)


thank you


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I think it complains your vertex's size isn't multiple of 4. You can try changing LODID to DXGI_FORMAT_R32_UINT or just leave it unused.

Since it mentions other formats you could also try to use separate buffer for LODID with DXGI_FORMAT_R16_UINT.

Edited by Zaoshi Kaba

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you are right. Also, there is not R16G16B16_UINT format, it has a reason :) These memory aligments are pain.

Thank you, I am on the good way now.


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