0xrsydn/gameboy-rust
1
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

feat(bios): implement fixed-point ArcTan and ArcTan2 services

Browse source 
Add SWI 0x09 and 0x0a as original ARM routines. Evaluate the fixed-point angle polynomial with wrapped products, reduce ArcTan2 ratios with integer division, and handle axes and quadrants. Require sign-extended 16-bit inputs and preserve non-result caller registers.

Add 15 regression tests for fixed-point and floating-point references, signed limits, rounding, quadrant boundaries, caller flags, stack bounds, repeated calls, and DMA/IRQ progress. Validate 671 default and 660 core-only tests in debug and release, plus all 10 native Darwin ARM64 window smoke tests.
This commit is contained in:
0xrsydn 2026-10-05 14:36:52 +07:00
commit 1edaa4151d
5 changed files with 537 additions and 11 deletions
Download patch file Download diff file Expand all files Collapse all files

4
tests/bios.rs
View file

@ -12,6 +12,8 @@ const DEST: u32 = 0x0201_0000;
const CALLBACK: u32 = 0x0300_0100;
const ROM_DATA: u32 = ROM_START + 13 * 4;
#[path = "bios/angles.rs"]
mod angles;
#[path = "bios/arithmetic.rs"]
mod arithmetic;
#[path = "bios/bit_unpack.rs"]
@ -223,7 +225,7 @@ fn vblank_wait_halts_dispatches_irq_and_returns_through_original_code() {
#[test]
fn unsupported_services_fail_at_an_explicit_instruction_trap() {
for service in [0, 1, 3, 9, 0x0a, 0x19, 0xff] {
for service in [0, 1, 3, 0x0d, 0x0e, 0x0f, 0x19, 0xff] {
let (mut machine, _) = call(service, false, [0, 0, 0]);
let error = (0..100)
.find_map(|_| machine.step().err())