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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