Do the order of the elements in the D3D11_INPUT_ELEMENT_DESC array matter?
In other words, are these two functionally identical?
D3D11_INPUT_ELEMENT_DESC VtxLayoutA[] = {
{ "POSITION", 0, DXGI_FORMAT_R32G32B32_FLOAT, 0, 0, D3D10_INPUT_PER_VERTEX_DATA, 0 },
{ "TEXCOORD", 0, DXGI_FORMAT_R32G32_FLOAT, 0, 16, D3D10_INPUT_PER_VERTEX_DATA, 0 },
{ "NORMAL", 0, DXGI_FORMAT_R32G32B32_FLOAT, 1, 0, D3D10_INPUT_PER_VERTEX_DATA, 0 },
};
D3D11_INPUT_ELEMENT_DESC VtxLayoutB[] = {
{ "POSITION", 0, DXGI_FORMAT_R32G32B32_FLOAT, 0, 0, D3D10_INPUT_PER_VERTEX_DATA, 0 },
{ "NORMAL", 0, DXGI_FORMAT_R32G32B32_FLOAT, 1, 0, D3D10_INPUT_PER_VERTEX_DATA, 0 },
{ "TEXCOORD", 0, DXGI_FORMAT_R32G32_FLOAT, 0, 16, D3D10_INPUT_PER_VERTEX_DATA, 0 },
};
[DX11] Does order matter in D3D11_INPUT_ELEMENT_DESC?
It should be identical. Are you experiencing a different behavior when binding the vertex buffer?
Author
Thanks for the quick reply. No, not experiencing any problem. The DX docs don't make it clear and I just wanted to get some clarity.
If you want to use D3D11_APPEND_ALIGNED_ELEMENT for the AlignedByteOffset then it will need to be in order I believe.
If you want to use D3D11_APPEND_ALIGNED_ELEMENT for the AlignedByteOffset then it will need to be in order I believe.
Note that in the previous case:
- On slot 0, POSITION offset(0) and TEXCOORD offset(16)
- On slot 1, NORMAL offset(0)
so D3D11_APPEND_ALIGNED_ELEMENT would also work as input elements are on different slot. Basically, as long as you keep order within a slot, that's fine, but you can make interleaved declaration of input elements on different slots.
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