nes

package
v0.0.0-...-0c3b9f0 Latest Latest
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 Go to latest Published: Sep 24, 2021 License: MIT Imports: 11 Imported by: 0

Documentation

Index

Constants

View Source 
const (
	ButtonA = iota
	ButtonB
	ButtonSelect
	ButtonStart
	ButtonUp
	ButtonDown
	ButtonLeft
	ButtonRight
)
View Source 
const (
	MirrorHorizontal = 0
	MirrorVertical   = 1
	MirrorSingle0    = 2
	MirrorSingle1    = 3
	MirrorFour       = 4
)
View Source 
const CPUFrequency = 1789773

Variables

View Source 
var MirrorLookup = [...][4]uint16{
	{0, 0, 1, 1},
	{0, 1, 0, 1},
	{0, 0, 0, 0},
	{1, 1, 1, 1},
	{0, 1, 2, 3},
}
View Source 
var Palette [64]color.RGBA

Functions

func MirrorAddress 

func MirrorAddress(mode byte, address uint16) uint16

Types

type APU 

type APU struct {
	// contains filtered or unexported fields
}

func NewAPU 

func NewAPU(console *Console) *APU

func (*APU) Load 

func (apu *APU) Load(decoder *gob.Decoder) error

func (*APU) Save 

func (apu *APU) Save(encoder *gob.Encoder) error

func (*APU) Step 

func (apu *APU) Step()

type CPU 

type CPU struct {
	Memory        // memory interface
	Cycles uint64 // number of cycles
	PC     uint16 // program counter
	SP     byte   // stack pointer
	A      byte   // accumulator
	X      byte   // x register
	Y      byte   // y register
	C      byte   // carry flag
	Z      byte   // zero flag
	I      byte   // interrupt disable flag
	D      byte   // decimal mode flag
	B      byte   // break command flag
	U      byte   // unused flag
	V      byte   // overflow flag
	N      byte   // negative flag
	// contains filtered or unexported fields
}

func NewCPU 

func NewCPU(console *Console) *CPU

func (*CPU) Flags 

func (cpu *CPU) Flags() byte

Flags returns the processor status flags

func (*CPU) Load 

func (cpu *CPU) Load(decoder *gob.Decoder) error

func (*CPU) PrintInstruction 

func (cpu *CPU) PrintInstruction()

PrintInstruction prints the current CPU state

func (*CPU) Read16 

func (cpu *CPU) Read16(address uint16) uint16

Read16 reads two bytes using Read to return a double-word value

func (*CPU) Reset 

func (cpu *CPU) Reset()

Reset resets the CPU to its initial powerup state

func (*CPU) Save 

func (cpu *CPU) Save(encoder *gob.Encoder) error

func (*CPU) SetFlags 

func (cpu *CPU) SetFlags(flags byte)

SetFlags sets the processor status flags

func (*CPU) Step 

func (cpu *CPU) Step() int

Step executes a single CPU instruction

type Cartridge 

type Cartridge struct {
	PRG     []byte // PRG-ROM banks
	CHR     []byte // CHR-ROM banks
	SRAM    []byte // Save RAM
	Mapper  byte   // mapper type
	Mirror  byte   // mirroring mode
	Battery byte   // battery present
}

func LoadNESFile 

func LoadNESFile(path string) (*Cartridge, error)

LoadNESFile reads an iNES file (.nes) and returns a Cartridge on success. http://wiki.nesdev.com/w/index.php/INES http://nesdev.com/NESDoc.pdf (page 28)

func NewCartridge 

func NewCartridge(prg, chr []byte, mapper, mirror, battery byte) *Cartridge

func (*Cartridge) Load 

func (cartridge *Cartridge) Load(decoder *gob.Decoder) error

func (*Cartridge) Save 

func (cartridge *Cartridge) Save(encoder *gob.Encoder) error

type Console 

type Console struct {
	CPU         *CPU
	APU         *APU
	PPU         *PPU
	Cartridge   *Cartridge
	Controller1 *Controller
	Controller2 *Controller
	Mapper      Mapper
	RAM         []byte
}

func NewConsole 

func NewConsole(path string) (*Console, error)

func (*Console) BackgroundColor 

func (console *Console) BackgroundColor() color.RGBA

func (*Console) Buffer 

func (console *Console) Buffer() *image.RGBA

func (*Console) Load 

func (console *Console) Load(decoder *gob.Decoder) error

func (*Console) LoadState 

func (console *Console) LoadState(filename string) error

func (*Console) Reset 

func (console *Console) Reset()

func (*Console) Save 

func (console *Console) Save(encoder *gob.Encoder) error

func (*Console) SaveState 

func (console *Console) SaveState(filename string) error

func (*Console) SetAudioChannel 

func (console *Console) SetAudioChannel(channel chan float32)

func (*Console) SetAudioSampleRate 

func (console *Console) SetAudioSampleRate(sampleRate float64)

func (*Console) SetButtons1 

func (console *Console) SetButtons1(buttons [8]bool)

func (*Console) SetButtons2 

func (console *Console) SetButtons2(buttons [8]bool)

func (*Console) Step 

func (console *Console) Step() int

func (*Console) StepFrame 

func (console *Console) StepFrame() int

func (*Console) StepSeconds 

func (console *Console) StepSeconds(seconds float64)

type Controller 

type Controller struct {
	// contains filtered or unexported fields
}

func NewController 

func NewController() *Controller

func (*Controller) Read 

func (c *Controller) Read() byte

func (*Controller) SetButtons 

func (c *Controller) SetButtons(buttons [8]bool)

func (*Controller) Write 

func (c *Controller) Write(value byte)

type DMC 

type DMC struct {
	// contains filtered or unexported fields
}

func (*DMC) Load 

func (d *DMC) Load(decoder *gob.Decoder) error

func (*DMC) Save 

func (d *DMC) Save(encoder *gob.Encoder) error

type Filter 

type Filter interface {
	Step(x float32) float32
}

func HighPassFilter 

func HighPassFilter(sampleRate float32, cutoffFreq float32) Filter

func LowPassFilter 

func LowPassFilter(sampleRate float32, cutoffFreq float32) Filter

sampleRate: samples per second cutoffFreq: oscillations per second

type FilterChain 

type FilterChain []Filter

func (FilterChain) Step 

func (fc FilterChain) Step(x float32) float32

type FirstOrderFilter 

type FirstOrderFilter struct {
	B0 float32
	B1 float32
	A1 float32
	// contains filtered or unexported fields
}

First order filters are defined by the following parameters. y[n] = B0*x[n] + B1*x[n-1] - A1*y[n-1]

func (*FirstOrderFilter) Step 

func (f *FirstOrderFilter) Step(x float32) float32

type Mapper 

type Mapper interface {
	Read(address uint16) byte
	Write(address uint16, value byte)
	Step()
	Save(encoder *gob.Encoder) error
	Load(decoder *gob.Decoder) error
}

func NewMapper 

func NewMapper(console *Console) (Mapper, error)

func NewMapper1 

func NewMapper1(cartridge *Cartridge) Mapper

func NewMapper2 

func NewMapper2(cartridge *Cartridge) Mapper

func NewMapper225 

func NewMapper225(cartridge *Cartridge) Mapper

func NewMapper3 

func NewMapper3(cartridge *Cartridge) Mapper

func NewMapper4 

func NewMapper4(console *Console, cartridge *Cartridge) Mapper

func NewMapper40 

func NewMapper40(console *Console, cartridge *Cartridge) Mapper

func NewMapper7 

func NewMapper7(cartridge *Cartridge) Mapper

type Mapper1 

type Mapper1 struct {
	*Cartridge
	// contains filtered or unexported fields
}

func (*Mapper1) Load 

func (m *Mapper1) Load(decoder *gob.Decoder) error

func (*Mapper1) Read 

func (m *Mapper1) Read(address uint16) byte

func (*Mapper1) Save 

func (m *Mapper1) Save(encoder *gob.Encoder) error

func (*Mapper1) Step 

func (m *Mapper1) Step()

func (*Mapper1) Write 

func (m *Mapper1) Write(address uint16, value byte)

type Mapper2 

type Mapper2 struct {
	*Cartridge
	// contains filtered or unexported fields
}

func (*Mapper2) Load 

func (m *Mapper2) Load(decoder *gob.Decoder) error

func (*Mapper2) Read 

func (m *Mapper2) Read(address uint16) byte

func (*Mapper2) Save 

func (m *Mapper2) Save(encoder *gob.Encoder) error

func (*Mapper2) Step 

func (m *Mapper2) Step()

func (*Mapper2) Write 

func (m *Mapper2) Write(address uint16, value byte)

type Mapper225 

type Mapper225 struct {
	*Cartridge
	// contains filtered or unexported fields
}

func (*Mapper225) Load 

func (m *Mapper225) Load(decoder *gob.Decoder) error

func (*Mapper225) Read 

func (m *Mapper225) Read(address uint16) byte

func (*Mapper225) Save 

func (m *Mapper225) Save(encoder *gob.Encoder) error

func (*Mapper225) Step 

func (m *Mapper225) Step()

func (*Mapper225) Write 

func (m *Mapper225) Write(address uint16, value byte)

type Mapper3 

type Mapper3 struct {
	*Cartridge
	// contains filtered or unexported fields
}

func (*Mapper3) Load 

func (m *Mapper3) Load(decoder *gob.Decoder) error

func (*Mapper3) Read 

func (m *Mapper3) Read(address uint16) byte

func (*Mapper3) Save 

func (m *Mapper3) Save(encoder *gob.Encoder) error

func (*Mapper3) Step 

func (m *Mapper3) Step()

func (*Mapper3) Write 

func (m *Mapper3) Write(address uint16, value byte)

type Mapper4 

type Mapper4 struct {
	*Cartridge
	// contains filtered or unexported fields
}

func (*Mapper4) HandleScanLine 

func (m *Mapper4) HandleScanLine()

func (*Mapper4) Load 

func (m *Mapper4) Load(decoder *gob.Decoder) error

func (*Mapper4) Read 

func (m *Mapper4) Read(address uint16) byte

func (*Mapper4) Save 

func (m *Mapper4) Save(encoder *gob.Encoder) error

func (*Mapper4) Step 

func (m *Mapper4) Step()

func (*Mapper4) Write 

func (m *Mapper4) Write(address uint16, value byte)

type Mapper40 

type Mapper40 struct {
	*Cartridge
	// contains filtered or unexported fields
}

func (*Mapper40) Load 

func (m *Mapper40) Load(decoder *gob.Decoder) error

func (*Mapper40) Read 

func (m *Mapper40) Read(address uint16) byte

func (*Mapper40) Save 

func (m *Mapper40) Save(encoder *gob.Encoder) error

func (*Mapper40) Step 

func (m *Mapper40) Step()

func (*Mapper40) Write 

func (m *Mapper40) Write(address uint16, value byte)

type Mapper7 

type Mapper7 struct {
	*Cartridge
	// contains filtered or unexported fields
}

func (*Mapper7) Load 

func (m *Mapper7) Load(decoder *gob.Decoder) error

func (*Mapper7) Read 

func (m *Mapper7) Read(address uint16) byte

func (*Mapper7) Save 

func (m *Mapper7) Save(encoder *gob.Encoder) error

func (*Mapper7) Step 

func (m *Mapper7) Step()

func (*Mapper7) Write 

func (m *Mapper7) Write(address uint16, value byte)

type Memory 

type Memory interface {
	Read(address uint16) byte
	Write(address uint16, value byte)
}

func NewCPUMemory 

func NewCPUMemory(console *Console) Memory

func NewPPUMemory 

func NewPPUMemory(console *Console) Memory

type Noise 

type Noise struct {
	// contains filtered or unexported fields
}

func (*Noise) Load 

func (n *Noise) Load(decoder *gob.Decoder) error

func (*Noise) Save 

func (n *Noise) Save(encoder *gob.Encoder) error

type PPU 

type PPU struct {
	Memory // memory interface

	Cycle    int    // 0-340
	ScanLine int    // 0-261, 0-239=visible, 240=post, 241-260=vblank, 261=pre
	Frame    uint64 // frame counter
	// contains filtered or unexported fields
}

func NewPPU 

func NewPPU(console *Console) *PPU

func (*PPU) Load 

func (ppu *PPU) Load(decoder *gob.Decoder) error

func (*PPU) Reset 

func (ppu *PPU) Reset()

func (*PPU) Save 

func (ppu *PPU) Save(encoder *gob.Encoder) error

func (*PPU) Step 

func (ppu *PPU) Step()

Step executes a single PPU cycle

type Pulse 

type Pulse struct {
	// contains filtered or unexported fields
}

func (*Pulse) Load 

func (p *Pulse) Load(decoder *gob.Decoder) error

func (*Pulse) Save 

func (p *Pulse) Save(encoder *gob.Encoder) error

type Triangle 

type Triangle struct {
	// contains filtered or unexported fields
}

func (*Triangle) Load 

func (t *Triangle) Load(decoder *gob.Decoder) error

func (*Triangle) Save 

func (t *Triangle) Save(encoder *gob.Encoder) error

Source Files

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