nes

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 Go to latest Published: Apr 6, 2020 License: GPL-3.0 Imports: 13 Imported by: 0

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Variables

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Functions

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Types

type APU 

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

APU represents the NES Audio Processing Unit

func NewAPU 

func NewAPU() *APU

NewAPU creates a new NES APU

func (*APU) AudioChannel 

func (a *APU) AudioChannel() chan float32

AudioChannel returns an audio channel to output the emulated audio

func (*APU) CPUWrite 

func (a *APU) CPUWrite(address uint16, data uint8)

CPUWrite writes data to the APU to update its status

type Button 

type Button int

Button represents a controller button 

const (
	// ButtonA is the NES A button
	ButtonA Button = iota
	// ButtonB is the NES B button
	ButtonB
	// ButtonStart is the NES Start button
	ButtonStart
	// ButtonSelect is the NES Select button
	ButtonSelect
	// ButtonUP is the NES Up button
	ButtonUP
	// ButtonDOWN is the NES Down button
	ButtonDOWN
	// ButtonLEFT is the NES Left button
	ButtonLEFT
	// ButtonRIGHT is the NES Right button
	ButtonRIGHT
)

type CPU 

type CPU struct {
	Lookup instructionSet
	// contains filtered or unexported fields
}

CPU represents the 6502 nes cpu

func NewCPU 

func NewCPU() *CPU

NewCPU creates a new NES cpu

func (*CPU) Complete 

func (c *CPU) Complete() bool

Complete indicates if the current instruction cycles have been consumed

func (*CPU) ConnectBus 

func (c *CPU) ConnectBus(bus *Console)

ConnectBus attaches the console bus to the cpu

func (*CPU) DissasembleCurrentPC 

func (c *CPU) DissasembleCurrentPC(writer io.Writer)

DissasembleCurrentPC writes to the writer the dissasembed currently executed code

func (*CPU) Read 

func (c *CPU) Read(address uint16) uint8

Read reads a value in an address

func (*CPU) Step 

func (c *CPU) Step()

Step steps the CPU a single micro-cycle

func (*CPU) Write 

func (c *CPU) Write(address uint16, data uint8)

Write writes a value in the specified address

type Cartridge 

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

Cartridge represents a NES cartridge

func NewCartridge 

func NewCartridge(filePath string) (*Cartridge, error)

NewCartridge creates a new cartridge from the specified file

func (*Cartridge) CPURead 

func (p *Cartridge) CPURead(address uint16, data *uint8) bool

CPURead makes a PRG read using a mapper as intermediary

func (*Cartridge) CPUWrite 

func (p *Cartridge) CPUWrite(address uint16, data uint8) bool

CPUWrite makes a PRG write using a mapper as intermediary

func (*Cartridge) MirroringType 

func (p *Cartridge) MirroringType() mappers.MirroringType

MirroringType returns the current mirroring type

func (*Cartridge) PPURead 

func (p *Cartridge) PPURead(address uint16, data *uint8) bool

PPURead makes a CHR read using a mapper as intermediary

func (*Cartridge) PPUWrite 

func (p *Cartridge) PPUWrite(address uint16, data uint8) bool

PPUWrite makes a CHR write using a mapper as intermediary

func (*Cartridge) Reset 

func (p *Cartridge) Reset()

Reset resets the cartridge

type Console 

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

Console represents the NES

func NewConsole 

func NewConsole() *Console

NewConsole creates an instance of a NES

func (*Console) AudioSource 

func (b *Console) AudioSource() *APU

AudioSource provides the audio source to the outside

func (*Console) Controller1 

func (b *Console) Controller1() InputController

Controller1 returns a handle to the first NES controller

func (*Console) Controller2 

func (b *Console) Controller2() InputController

Controller2 returns a handle to the second NES controller

func (*Console) Disassemble 

func (b *Console) Disassemble()

Disassemble shows the currently executed code

func (*Console) InsertCartridge 

func (b *Console) InsertCartridge(c *Cartridge)

InsertCartridge connects the cartridge to the console

func (*Console) Reset 

func (b *Console) Reset()

Reset resets the console

func (*Console) Step 

func (b *Console) Step()

Step steps the console a single cycle

func (*Console) StepFrame 

func (b *Console) StepFrame()

StepFrame steps the console enough to generate one frame

func (*Console) TextureProvider 

func (b *Console) TextureProvider() gui.TextureProvider

TextureProvider returns the texture provider, in this case the PPU

type InputController 

type InputController interface {
	Press(button Button)
	// Reset prepares the controller for another read
	Reset()
}

InputController represents an input controller that acts as an interface to the internal nes controller, the 'Presses' should be scanned from the input device as they will be buffered and scanned by the CPU and flushed when instructed

type PPU 

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

PPU represents the Picture Processing Unit of the NES

func NewPPU 

func NewPPU() *PPU

NewPPU creates a new Picture Processing Unit instance

func (*PPU) CPURead 

func (ppu *PPU) CPURead(address uint16, readOnly bool) uint8

CPURead reads a value triggered by the CPU

func (*PPU) CPUWrite 

func (ppu *PPU) CPUWrite(address uint16, data uint8)

CPUWrite writes a value triggered by the CPU

func (*PPU) IncrementScrollX 

func (ppu *PPU) IncrementScrollX()

IncrementScrollX updates variables for X-scrolling

func (*PPU) IncrementScrollY 

func (ppu *PPU) IncrementScrollY()

IncrementScrollY update variables for Y-scrolling

func (*PPU) InsertCartridge 

func (ppu *PPU) InsertCartridge(c *Cartridge)

InsertCartridge sets the current cartridge

func (*PPU) LoadBackgroundShifters 

func (ppu *PPU) LoadBackgroundShifters()

LoadBackgroundShifters prepares the shifters to render the next background tile

func (*PPU) PPURead 

func (ppu *PPU) PPURead(address uint16, readOnly bool) uint8

PPURead reads a value triggered by the PPU (CHR data)

func (*PPU) PPUWrite 

func (ppu *PPU) PPUWrite(address uint16, data uint8)

PPUWrite reads a value triggered by the PPU (CHR data)

func (*PPU) Step 

func (ppu *PPU) Step()

Step is in charge of rendering the output of the PPU

func (*PPU) Texture 

func (ppu *PPU) Texture(idx ...int) *image.RGBA

Texture returns the current texture rendered by the PPU This implements gui.TextureProvider

func (*PPU) TransferAddressX 

func (ppu *PPU) TransferAddressX()

TransferAddressX copies from the tempVRAM the nametable and coarseX variables

func (*PPU) TransferAddressY 

func (ppu *PPU) TransferAddressY()

TransferAddressY copies from the tempVRAM the nametable and coarseY variables and fineY

func (*PPU) UpdateShifters 

func (ppu *PPU) UpdateShifters()

UpdateShifters shifts one position the background shifters and updates the sprite shifters also

Source Files

View all Source files

Directories

Path Synopsis
mapper0
mapper1

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