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ShaderResourceView/ D3D11_BUFFER_SRV doc and usage mistmatch

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Usually when I was creating a ShaderResourceView on a Buffer (in hlsl: Buffer<float4> for example) or a StructuredBuffer (for example: StructuredBuffer<float4>), I was using something like:

[source lang="cpp"]


desc.ViewDimension = D3D11_SRV_DIMENSION_BUFFER;
desc.Format = ...;
desc.Buffer.FirstElement = index; // Index in element count
desc.Buffer.NumElements = count; // Number of elements


It is working fine with both type of buffers (plain or structured), but today, I was checking the documentation of [url="http://msdn.microsoft.com/en-us/library/windows/desktop/ff476094%28v=vs.85%29.aspx"]D3D11_BUFFER_SRV[/url], and It says something completely invalid to the usage I have of it.
First of all, there is an union:

[source lang="cpp"]
typedef struct D3D11_BUFFER_SRV {
union {
UINT FirstElement;
UINT ElementOffset;
union {
UINT NumElements;
UINT ElementWidth;


I have two questions:

[b]1) [/b]And as stated in the doc FirstElement is "[i]Number of bytes between the beginning of the buffer and the first element to access.[/i]"[b], which is not what I'm experiencing[/b], as I use the index of element, not the index * sizeof(element).
Is it the documentation that is wrong or Am I missing something here?

[b]2)[/b] Also, ElementOffset would appear to be used with a byte offset, and ElementWidth as the size of the element[b], but in which case these fields are interpreted like this?[/b] I can't find any relevant doc about this.

Any hint highly appreciated! [img]http://public.gamedev.net//public/style_emoticons/default/smile.png[/img]

Edit: Sorry for the source code, I can't get the source tag to work correctly, everything is collapsed. Edited by xoofx

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