#rendertotexture

Comparing to render to texture 2d, creating a cubemap as render target is similar with minor difference.

A texture 2d desc will be used for texture creation. When creating a cubemap, ArraySize must be 6 and MiscFlags should be D3D11_RESOURCE_MISC_TEXTURECUBE.

D3D11_TEXTURE2D_DESC cubeTexDesc; cubeTexDesc.Width = 256; cubeTexDesc.Height = 256; cubeTexDesc.MipLevels = 1; cubeTexDesc.ArraySize = 6; cubeTexDesc.Format = DXGI_FORMAT_R8G8B8A8_UNORM; cubeTexDesc.SampleDesc.Count = 1; cubeTexDesc.SampleDesc.Quality = 0; cubeTexDesc.Usage = D3D11_USAGE_DEFAULT; cubeTexDesc.BindFlags = D3D11_BIND_RENDER_TARGET | D3D11_BIND_SHADER_RESOURCE; cubeTexDesc.CPUAccessFlags = 0; cubeTexDesc.MiscFlags = D3D11_RESOURCE_MISC_TEXTURECUBE;

RRenderer.D3DDevice()->CreateTexture2D(&cubeTexDesc, 0, &cdb.Buffer);

We need six render target views, each of them need a D3D11_RTV_DIMENSION_TEXTURE2DARRAY as ViewDimension. To create render target view for each side, Texture2DArray.FirstArraySlice should be set to the face id.

D3D11_RENDER_TARGET_VIEW_DESC cubeRTVDesc; cubeRTVDesc.Format = cubeTexDesc.Format; cubeRTVDesc.ViewDimension = D3D11_RTV_DIMENSION_TEXTURE2DARRAY; cubeRTVDesc.Texture2DArray.ArraySize = 1; cubeRTVDesc.Texture2DArray.MipSlice = 0; for (int i = 0; i < 6; i++) {     cubeRTVDesc.Texture2DArray.FirstArraySlice = i;     RRenderer.D3DDevice()->CreateRenderTargetView(cdb.Buffer, &cubeRTVDesc, &cdb.View[i]); }

Then we create a shader resource view with ViewDimention set to D3D11_SRV_DIMENSION_TEXTURECUBE

D3D11_SHADER_RESOURCE_VIEW_DESC cubeSRVDesc; cubeSRVDesc.Format = cubeRTVDesc.Format; cubeSRVDesc.ViewDimension = D3D11_SRV_DIMENSION_TEXTURECUBE; cubeSRVDesc.TextureCube.MipLevels = 1; cubeSRVDesc.TextureCube.MostDetailedMip = 0; RRenderer.D3DDevice()->CreateShaderResourceView(cdb.Buffer, &cubeSRVDesc, &cdb.SRV);

Similarly, create texture2d, 6 render target views and shader resource view for depth buffer with D3D11_BIND_DEPTH_STENCIL in BindFlags and format as a depth buffer compatible format.

To render to cubemap, set up six cameras at a view point with 90 degree FOV and each camera looks at one axis direction.