They distributed the required work among themselves and spent countless hours in coding, unit testing, game testing, and performance validation.īlinkhawk mainly worked on implementing miscellaneous instructions, including texture sampling instructions required for decompilation. Project Hades was a collaborative effort from developers Rodrigo, Blinkhawk, and epicboy. Over the course of a few months, the developers would go on to face and overcome many hurdles with the code rewrite and the Project’s goals would expand to accommodate much more. Taking a leaf from dynarmic’s book, the developers opted to use an SSA representation, as it would work very nicely with the SPIR-V IR used for shaders, thanks to its native support for SSA.Īs for the unit testing, Rodrigo wrote homebrew tests for the hardware which helped the developers accurately emulate hardware behaviour.
Rewriting the decompiler would allow us to audit it through unit testing, following a design similar to dynarmic, allowing proper program analysis and optimizations over fast-to-emit intermediate representation. It aimed to make both decompilation and compilation faster overall, thus improving the performance. The main goal of Project Hades was to redesign the decompiler and shader generation code with a focus on simplicity and accuracy. Shader compilation is the process of taking that representation and sending it to the host GPU driver to get compiled and then executed on the user’s GPU. Shader decompilation is the process of translating the guest (in this case, the Nintendo Switch) GPU machine code to a representation that can be compiled on the host (User’s PC) GPU.
Therefore, yuzu first decompiles these shaders into something called IR, or Intermediate Representation, which is then used to generate the high-level GLSL/SPIR-V/GLASM shaders used by the graphics APIs and drivers to render games on the host GPU.
However, since these shaders are precompiled for the Switch’s GPU, yuzu cannot use them directly to render graphics using the host GPU (User’s GPU). In the case of Switch games, they also use shaders to render graphics on the Switch itself.
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