luna | yet another UI library , built to manage JS components | User Interface library

I have a DirectX 12 desktop project on Windows 11 that implements post-processing using a combination of DXTK post-process effects.

The aim of the post-proc sequence is to end up with individual bloom and blur textures (along with a depth texture rendered in a depth pass) which are sampled in a 'big triangle' pixel shader to achieve a depth of field effect for the final backbuffer screen image.

The DXTK PostProcesses operate on the full-size (1920x1080) screen texture. Presently this isn't impacting performance (benchmarked at 60fps), but I imagine it could be an issue when I eventually want to support 4K resolutions in future, where full-size image post-processing could be expensive.

Since the recommended best practice is to operate on a scaled down copy of the source image, I hoped to achieve this by using half-size (i.e. quarter resolution) working textures with the DownScale_2x2 BasicPostProcess option. But after several attempts experimenting with the effect, only the top-left quarter of the original source image is being rendered to the downsized texture... not the full image as expected per the documentation:

DownScale_2x2: Downscales each 2x2 block of pixels to an average. This is intended to write to a render target that is half the size of the source texture in each dimension.

Other points of note:

• scene geometry is first rendered to a _R16G16B16A16_FLOAT MSAA render target and resolved to single-sample 16fp target
• postprocessing operates on resolved single-sample 16fp target (where only the intermediate 'Pass1' & 'Pass2' working render targets are set to half the backbuffer length & width)
• final processed image is tonemapped to the _R10G10B10A2_UNORM swapchain backbuffer for presentation.

The following code snippets show how I'm implementing the DownScale_2x2 shader into my post-process. Hopefully it's enough to resolve the issue and I can update with more info if necessary.

Resource initialization under CreateDeviceDependentResources():

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