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35 lines
3.2 KiB
Markdown
35 lines
3.2 KiB
Markdown
## How to I compile it and run it?
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* You need a C compiler, make, and a few libraries:
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* libasound2-dev [ optional, for audio ]
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* libgl-dev
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* libglu-dev
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* libx11-dev
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* Many of them will probably be installed already if you regulargly compile stuff.
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* Then just type `make` and it should compile.
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* To run it, just type `build-x86_64-linux-gnu/bin/mii_emu` and it should start.
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## Development
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* This is the first project I made using vscode as my main IDE; I used Eclipse for many years as the indexer was pretty much unbeatable (still is).
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* To support vscode I needed some tooling to create the '*compile_commands.json*' file, which is used by the C/C++ extension to provide intellisense. So to create that file, you use `make lsp` and it will create the file in the project directory.
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* Another thing vscode sucks at is Makefiles (despite the extension, building is painful and next to useless). So there is a target called `make watch` that you can run in a separate terminal to auto-build as soon as you save any files in vscode. That is when you realize for example that vscode re-save the file anytime you press control-S, regardless of wether the file has changed or not. So you end up with a lot of unnecessary builds. I'm sure there is a way to fix that, but I haven't found it yet.
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## Code Style
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I have pretty consistent code style across my projects.
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* tabs=4. Just because.
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* 80 columns lines or so. I don't like to scroll horizontally and I like splitting my screen vertically. (also see, tabs=4!).
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* K&R style exclusively. None of that Allman/GNU horribleness.
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* GNU99 Dialect.
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* No Yoda, we are no longer in 1975. `if (0 == foo)` is just stupid.
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* I use !! to convert to 1 or zero from an expression. I call it the 'normalisation operator'. it is not commonly seen, apart from places like the Linux kernel.
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* I use *minipt.h* for protothreads. I like protothreads, and when you are aware of their limitations, they are a great tool. They are used for the video rendering, the no-slot-clock etc.
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## What needs doing?
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* I'm sure there are bugs. I haven't tested it on a lot of hardware, and apart from quite a few games and a few known productivity app, it had had very little extensive testing. So testing!
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* In the code there are a few bits which needs fixing
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* The mouse card is not working properly. It works for some (most importantly A2 Desktop), but it's not working properly. I suspect the VBL Interrupt handling.
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* In mii.c, the *mii_page_table_update()* does work, but it sub-optimal, it was handy to debug the countless combination of soft-switches, but it is not the ideal way to handle that problem; it needs a proper switch-case statement.
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* The floppy drive emulation was borrowed from bobbin, and it works, and it
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got it all working, but it's definitely not matching the style of the rest of the codebase. It needs to be replaced.
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* Plenty of the most complicated piece of code (video, memory mapping) load a dozen of soft-switches, it probably should use a separately maintained bit field that is maintained by the on/off switches, and would make it a lot easier to test for bit combinations.
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* The static array of memory 'banks' works, but it prevents me easily making a memory extension card. It should be refactored at some point.
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