The way GPU emulation works is fairly simple once you’ve got perfect CPU emulation (ha! ). Whenever the CPU accesses memory, the CPU emulation code checks what the accessed address is mapped to. If it’s mapped to the GPU, we’ve got a bunch of handler functions which will check what the accessed register is supposed to do and execute the proper action then. In case of an emulator like Dolphin which tries to use the GPU where appropriate for this, this includes translating the GPU registers to the available Direct3D/OpenGL API functions (using these APIs is the only way to access the GPU on PC hardware by the way because of user-mode restrictions, i.e. we can’t directly access the GPU registers from Dolphin; only GPU drivers may do so).
Ultima modifica di Glorfindel; 04-03-17 alle 11:18
). Whenever the CPU accesses memory, the CPU emulation code checks what the accessed address is mapped to. If it’s mapped to the GPU, we’ve got a bunch of handler functions which will check what the accessed register is supposed to do and execute the proper action then. In case of an emulator like Dolphin which tries to use the GPU where appropriate for this, this includes translating the GPU registers to the available Direct3D/OpenGL API functions (using these APIs is the only way to access the GPU on PC hardware by the way because of user-mode restrictions, i.e. we can’t directly access the GPU registers from Dolphin; only GPU drivers may do so).
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