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DX11 [SlimDX] Texture array with DirectX11

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Hello,

I try to migrate my code to directX11, but I'm stuck at the creation of texture array.

here is the code I used with slimDX - DX 10 (Working fine) :



//Foreach Texture
for (int arraySlice = 0; arraySlice < srcTex.Length; arraySlice++)
{
//Foreach mipmap level
for (int mipSlice = 0; mipSlice < Imagesdesc.MipLevels; mipSlice++)
{
var mapped = srcTex[arraySlice].Map(mipSlice, MapMode.Read, MapFlags.None);
mapped.Data.Position = 0;

device.UpdateSubresource(new DataBox(mapped.Pitch, 0, mapped.Data),
texArray,
S33M3Engines.D3D.Tools.Resource.CalcSubresource(mipSlice, arraySlice, Imagesdesc.MipLevels)
);
srcTex[arraySlice].Unmap(mipSlice);
}
}



Here is the translated DX11 code :



for (int arraySlice = 0; arraySlice < srcTex.Length; arraySlice++)
{
//Foreach mipmap level
for (int mipSlice = 0; mipSlice < Imagesdesc.MipLevels; mipSlice++)
{
int mipHeight = ArrayTextureHelper.GetMipSize(mipSlice, srcTex[arraySlice].Description.Height);
int lockedSize = mipHeight * RowPtch; // <===== What's the Row pitch of the targetted texture2d mipmap subresource ?

DataBox box = device.ImmediateContext.MapSubresource(srcTex[arraySlice], mipSlice, lockedSize , MapMode.Read, MapFlags.None);

box.Data.Position = 0;
device.ImmediateContext.UpdateSubresource(box,
texArray,
S33M3Engines.D3D.Tools.Resource.CalcSubresource(mipSlice, arraySlice, Imagesdesc.MipLevels)
);
device.ImmediateContext.UnmapSubresource(srcTex[arraySlice], mipSlice);
}
}



The problem is :
- I don't know the rowpitch before the MapSubresource (The row pitch will after that be inside the databox). This rowpitch is needed to compute the sizeinbyte of my subresource
- MapSubresource need the sizeinbyte to create the databox.

So here I'm stuck ! How can I find it ? Can I compute what will be the rowpitch of the mipmap based on the mipmap level and the texture height + width ?

Tx you for your help !

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