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Funkymunky

Render to Texture Array, seeing nothing

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As per the title, I am having trouble rendering to a texture array.  I have successfully rendered to one using MRT.  I called CreateTexture2D with a D3D11_TEXTURE2D_DESC that specified an ArraySize of 4, called CreateShaderResourceView with a D3D11_SHADER_RESOURCE_VIEW_DESC that had 4 for its Texture2DArray.ArraySize parameter, and made a call to CreateRenderTargetView for each render target (i created an array of them) with a D3D11_RENDER_TARGET_VIEW_DESC specifying 1 for its Texture2DArray.ArraySize and an index offset for its Texture2DArray.FirstArraySlice.  In the pixel shader I then wrote to SV_TARGET0, SV_TARGET1 etc.  When I call OMSetRenderTargets, I set it to render 4 render targets and pass my array.

 

That works fine.

 

Now I want to render to a texture array, but use the geometry shader to specify which slice to render to via SV_RenderTargetArrayIndex.  So I set up the same as above; 4 layers specified to CreateTexture2D, 4 layers specified to CreateShaderResourceView.  But this time I set up the D3D11_RENDER_TARGET_VIEW_DESC to have 4 layers in its Texture2DArray.ArraySize, and called CreateRenderTargetView only once.  I draw 4 instanced copies, and my geometry shader sets SV_RenderTargetArrayIndex and the associated pixel shader outputs to SV_TARGET. I call OMSetRenderTargets for 1 render target,  I see nothing.

 

If I change the D3D11_RENDER_TARGET_VIEW_DESC to have 1 layer, I see all my instanced renderings output to the first slice of the texture.  But setting it to 4 means I see nothing.  The device clears each layer of the array properly, but I can't seem to render to them.

 

What could I be missing?

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Ah, I solved it.  For an MRT set up, I was only using a single depth buffer.  For an array of render targets, I need an array of depth buffers.

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