CODEWITHSUNDEEP
c++directx-11
gooseim
gooseim

Reputation: 21

Get byte array from texture

Can I get a byte array (ARGB) from D3D11Texture2D? DirectX 11 doesn't have the functions GetSurfaceLevel and LockRect.

Upvotes: 2

Views: 4073

Answers (2)

alanw
alanw

Reputation: 665

Use Map/Unmap functions on your DeviceContext. This will only work for texture types that support reading.

eg

D3D11_MAP eMapType = D3D11_MAP_READ;
D3D11_MAPPED_SUBRESOURCE mappedResource;

pDeviceContext->Map(m_pTexture, 0, eMapType, NULL, &mappedResource);

BYTE* pYourBytes = (BYTE*)mappedResource.pData;
unsigned int uiPitch = mappedResource.RowPitch;

// Do stuff here

pDevice->GetDeviceContext()->Unmap(m_pTexture, 0);

If you want to read out the contents of a render texture then you will need to first create a staging texture of the same format as your render texture then copy the render texture to the staging texture using DeviceContext->CopyResource().

Upvotes: 3

rioki
rioki

Reputation: 6118

Why would you want to read back the data of a texture? You hold the data in RAM, then upload it to VRAM. You should still have it in RAM or on disk. AM I missing something?

You may want to look at how it was solved in DirectX 11 framebuffer capture (C++, no Win32 or D3DX)

Upvotes: 1

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