EGG::Mathf Namespace Reference

Detailed Description

Math functions and constants used in the base game.

Classes
struct	AtanEntry
struct	BaseAndDec
union	c64
struct	SinCosEntry

Functions
f32	frsqrt (f32 x)
f32	SinFIdx (f32 fidx)
f32	CosFIdx (f32 fidx)
f32	AtanFIdx_ (f32 x)
f32	Atan2FIdx (f32 y, f32 x)
static f32	sqrt (f32 x)
static f32	sin (f32 x)
static f32	cos (f32 x)
static f32	acos (f32 x)
static f32	atan2 (f32 y, f32 x)
static f32	abs (f32 x)
static f64	force25Bit (f64 x)
	This is used to mimic the Wii's floating-point unit.
static f32	fma (f32 x, f32 y, f32 z)
	Fused multiply-add operation.
static f32	fms (f32 x, f32 y, f32 z)
	Fused multiply-subtract operation.
static f64	frsqrte (const f64 val)

Variables
static constexpr SinCosEntry	sSinCosTbl [256+1]
static constexpr AtanEntry	sArcTanTbl [32+1]
static constexpr u64	EXPONENT_SHIFT_F64 = 52
static constexpr u64	MANTISSA_MASK_F64 = 0x000fffffffffffffULL
static constexpr u64	EXPONENT_MASK_F64 = 0x7ff0000000000000ULL
static constexpr u64	SIGN_MASK_F64 = 0x8000000000000000ULL
static constexpr std::array< BaseAndDec, 32 >	RSQRTE_TABLE

Function Documentation

abs()

static f32 EGG::Mathf::abs ( f32 x )

inlinestaticnodiscard

Definition at line 53 of file Math.hh.

acos()

static f32 EGG::Mathf::acos ( f32 x )

inlinestaticnodiscard0x8022F8C0

Definition at line 44 of file Math.hh.

atan2()

static f32 EGG::Mathf::atan2 ( f32 y, f32 x )

inlinestaticnodiscard0x8022F8E4

Definition at line 49 of file Math.hh.

Atan2FIdx()

f32 EGG::Mathf::Atan2FIdx ( f32 y, f32 x )

nodiscard0x800853C0

Definition at line 365 of file Math.cc.

AtanFIdx_()

f32 EGG::Mathf::AtanFIdx_ ( f32 x )

nodiscard

Definition at line 357 of file Math.cc.

cos()

static f32 EGG::Mathf::cos ( f32 x )

inlinestaticnodiscard0x8022F86C

Takes in radians

Definition at line 39 of file Math.hh.

CosFIdx()

f32 EGG::Mathf::CosFIdx ( f32 fidx )

nodiscard0x80085180

Definition at line 343 of file Math.cc.

fma()

static f32 EGG::Mathf::fma ( f32 x, f32 y, f32 z )

inlinestaticnodiscard

Fused multiply-add operation.

We cannot use std::fma due to the Wii computing at 64-bit precision.

Definition at line 68 of file Math.hh.

fms()

static f32 EGG::Mathf::fms ( f32 x, f32 y, f32 z )

inlinestaticnodiscard

Fused multiply-subtract operation.

We cannot use std::fms due to the Wii computing at 64-bit precision.

Definition at line 75 of file Math.hh.

force25Bit()

static f64 EGG::Mathf::force25Bit ( f64 x )

inlinestaticnodiscard

This is used to mimic the Wii's floating-point unit.

This handles the edgecase where double-precision floating-point numbers are passed into single-precision floating-point operands in assembly.

Definition at line 60 of file Math.hh.

frsqrt()

f32 EGG::Mathf::frsqrt ( f32 x )

nodiscard0x80085040

CREDIT: Hanachan

Definition at line 315 of file Math.cc.

frsqrte()

static f64 EGG::Mathf::frsqrte ( const f64 val )

inlinestaticnodiscard

Definition at line 139 of file Math.hh.

sin()

static f32 EGG::Mathf::sin ( f32 x )

inlinestaticnodiscard0x8022F860

Takes in radians

Definition at line 33 of file Math.hh.

SinFIdx()

f32 EGG::Mathf::SinFIdx ( f32 fidx )

nodiscard0x80085110

Definition at line 328 of file Math.cc.

sqrt()

static f32 EGG::Mathf::sqrt ( f32 x )

inlinestaticnodiscard0x8022F80C

Definition at line 22 of file Math.hh.

Variable Documentation

EXPONENT_MASK_F64

u64 EGG::Mathf::EXPONENT_MASK_F64 = 0x7ff0000000000000ULL

staticconstexpr

Definition at line 101 of file Math.hh.

EXPONENT_SHIFT_F64

u64 EGG::Mathf::EXPONENT_SHIFT_F64 = 52

staticconstexpr

Definition at line 99 of file Math.hh.

MANTISSA_MASK_F64

u64 EGG::Mathf::MANTISSA_MASK_F64 = 0x000fffffffffffffULL

staticconstexpr

Definition at line 100 of file Math.hh.

RSQRTE_TABLE

std::array<BaseAndDec, 32> EGG::Mathf::RSQRTE_TABLE

staticconstexpr

Definition at line 104 of file Math.hh.

sArcTanTbl

AtanEntry EGG::Mathf::sArcTanTbl[32+1]

staticconstexpr0x80274148

Definition at line 277 of file Math.cc.

SIGN_MASK_F64

u64 EGG::Mathf::SIGN_MASK_F64 = 0x8000000000000000ULL

staticconstexpr

Definition at line 102 of file Math.hh.

sSinCosTbl

SinCosEntry EGG::Mathf::sSinCosTbl[256+1]

staticconstexpr0x80248010

Definition at line 16 of file Math.cc.