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Here's a very clean and clever NES emulator in C++ by Bisqwit of TAS fame: https://www.youtube.com/watch?v=y71lli8MS8s https://www.youtube.com/watch?v=y71lli8MS

by atesti 12y ago

Here's a very clean and clever NES emulator in C++ by Bisqwit of TAS fame: https://www.youtube.com/watch?v=y71lli8MS8s https://www.youtube.com/watch?v=y71lli8MS8s He presents the code in the style of a tool assisted run, typing it in in high speed. I never saw templates used like that to create the unrolled CPU dispatcher

kibwen 12y ago
The code for the CPU dispatcher begins at 1:26 in the linked video, for those not willing to watch the whole thing. A comment elsewhere in the thread mentions Sprocketnes, written in Rust, which takes a different tack here: it uses a hygienic macro to implement opcode dispatching, which allows the giant block of dispatching logic to be reused for both the emulator and the disassembler: https://github.com/pcwalton/sprocketnes/blob/master/cpu.rs#L111-L319 https://github.com/pcwalton/sprocketnes/blob/master/cpu.rs#L...