Profiling GameBoyAdvance::frame shows that it spends way too much time idleing
on SoundController::update & Gpu::step waiting for the cycle count to
reach to the next event, Consuming cpu time for the Arm7tdmi core.
This commit changes the implementation of the main loop functions so
that the CPU will run as many cycles as possible and the peripherals
will only be updated when needed.
The is a performance improvement of roughly 50% in fps in some games!
Former-commit-id: 937e097f958423934c70b7face6b6b02926b7a51
1) Decouple SysBus from Gpu
2) Split Gpu rendering function into separate modules
3) Cleanup
Former-commit-id: 0435ad1c9c1de72ed50769fabfea7c5f33b670e0
Cleanup timer.rs
run cargo fmt
restore debugging continue&frame commands
Fix bug introduced in previous commit causing the bios animation to
hang
Former-commit-id: 188acaa1121503a97f2d3be816f6f57835e17fe1
- Add tracing of opcodes and potentially more stuff
- Add option to run a script file at the beginnig (I use it to redirect
traces to a file)
- Support breakpoints again
Former-commit-id: 4e988d6bc1a59456c96547f0320a6d9abedcae00
Fix tons of bug and reimplemented some of the core code.
Add a neat feature for debug builds:
When the cpu "swi 0x55" instruction, a breakpoint is triggered on the
host.
Former-commit-id: 959249df4374327d90b2503d7a45f8d5d27995a6
I have fought very hard against the rust ownership model,
In the end for DMA to play nice with my code, I had to resort to use
unsafe code for now..
The DMA implementation itself is not accurate to say the least, but will
have to do for now.
Tonc's dma_demo.gba plays but with a visual glitch.
Former-commit-id: 3b9cdcb2d09c78701290f2c48b77f9f3487e85c9
The way cycles were counted up untill now was not accurate enough,
I've avoided doing so because the instruction implementation looks
bloated this way, but I've had problems with cycle accuracy with tonc's
timer demo.
This is not entirely correct though, and I'm 100% sure there are some
mistakes, but works good enough for now.
Former-commit-id: 748faaf99fe2f42925c0a2110192c6a01e5d27d4
This commit refactors the ioregs:
* Use bitfield crate to implement the GPU ioregs.
* IoRegs are stored in their own variables bindings (i.e, Gpu related ioregs are now fields of the Gpu struct)
- This optimize performance quiet alot from my testings - since every scanline was accessing deseralizing ioregs from sysbus. (Getting constant 59fps now)
* For now, comment out DMA model
Also, cleaned the code up to eliminate rustc warnings.
Former-commit-id: 9077695c446ebd1a71783acfdd9819245aa02d7a
