If you spend a long enough time in graphics development, the time will come eventually when you want to cast between different formats of a GPU resource. The problem is that information about how to do this was a bit hard to come by – until now.
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This post shows a way to compute derivatives for texture filtering in compute shaders (for visibility buffer shading). I was missing a step-by-step explanation of how to do this, but after some trial and error, the following method turned out to work well.
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Wicked Engine used Visual Studio to compile all its shaders for a long time, but that changed around a year ago (in 2021) when custom shader compiling tools were implemented. This blog highlights the benefits of this and may provide some new ideas if you are developing graphics programs or tools.
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Lately I’ve been interested in modernizing the geometry pipeline in the rendering engine, for example reducing the vertex shaders. It’s a well known fact that geometry shaders are not making efficient use of the GPU hardware, but similar issues could apply for vertex and tessellation shaders too, just because there is a need for pushing data through multiple pipeline stages. This can result in memory traffic and allocation bottlenecks between geometry and pixel stages.
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