// Fixed-point math helpers that mirror the conventions used by the
// FS2 disassembly: byte angles (256 == full turn), 16-bit signed
// magnitudes scaled to fit ±$7FFF.

#ifndef MATH6502_H
#define MATH6502_H

#include <stdint.h>

void math6502Init(void);

// sin(byteAngle) -> -32767..32767. Matches `SinByteAngle` in the
// disassembly.
int16_t math6502Sin(uint8_t byteAngle);

// cos(byteAngle) -> -32767..32767.
int16_t math6502Cos(uint8_t byteAngle);

// (Y * X) signed, returns the 16-bit signed product. Matches
// `MultiplyXY` in the disassembly.
int16_t math6502SignedMul(int8_t y, int8_t x);

// Integer square root of a non-negative int32. Returns 0 for negative
// input. Matches the standard hardware-trick algorithm; precision is
// exact when the answer fits in 16 bits.
uint16_t math6502Sqrt(int32_t n);

#endif