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GBA BIOS: Fix ArcTan2 accuracy and boundary conditions

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This commit is contained in:
Jeffrey Pfau 2016-06-16 00:19:20 -07:00
parent eb6cedde2e
commit 415298ebcd
2 changed files with 2 additions and 1 deletions
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1
CHANGES
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@ -27,6 +27,7 @@ Bugfixes:
- ARM7: Fix flags on SBC/RSC
- Util: Fix realloc semantics in utf16to8
- ARM7: Fix setting spsr privilege bits when spsr is empty
- GBA BIOS: Fix ArcTan2 accuracy and boundary conditions
Misc:
- GBA: Slightly optimize GBAProcessEvents
- Qt: Add preset for DualShock 4

2
src/gba/bios.c
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@ -304,7 +304,7 @@ void GBASwi16(struct ARMCore* cpu, int immediate) {
cpu->gprs[0] = sqrt((uint32_t) cpu->gprs[0]);
break;
case 0xA:
cpu->gprs[0] = atan2f(cpu->gprs[1] / 16384.f, cpu->gprs[0] / 16384.f) / (2 * M_PI) * 0x10000;
cpu->gprs[0] = (uint16_t) (atan2f(cpu->gprs[1] / 16384.f, cpu->gprs[0] / 16384.f) / (2 * M_PI) * 0x10001);
break;
case 0xB:
case 0xC: