From 6f96020c61e1b8a240e3cf13e662c113d6435758 Mon Sep 17 00:00:00 2001 From: Jairinho Date: Mon, 28 Feb 2022 14:24:29 -0300 Subject: [PATCH] loading the default font + fix the PC register --- chip8/chip8.go | 37 ++++++---- chip8/instructions.go | 3 +- cmd/chip8/main.go | 57 +++++++++++++++ go.mod | 9 +++ go.sum | 95 +++++++++++++++++++++++++ roms/Space Invaders [David Winter].ch8 | Bin 0 -> 1301 bytes 6 files changed, 188 insertions(+), 13 deletions(-) create mode 100644 cmd/chip8/main.go create mode 100644 roms/Space Invaders [David Winter].ch8 diff --git a/chip8/chip8.go b/chip8/chip8.go index 5840f53..78e8b26 100644 --- a/chip8/chip8.go +++ b/chip8/chip8.go @@ -48,15 +48,10 @@ func (emulator *Emulator) Reset() { emulator.DT = 0 emulator.ST = 0 emulator.Memory = [MemorySize]uint8{} - - // clean stack emulator.Stack.Clear() - - // clean display emulator.ClearScreen() - - // reload ROM emulator.LoadROM(emulator.ROM) + emulator.LoadFont() } func (emulator *Emulator) LoadROM(rom []uint8) { @@ -65,9 +60,28 @@ func (emulator *Emulator) LoadROM(rom []uint8) { copy(emulator.Memory[ProgramAddress:], emulator.ROM) } -func (emulator *Emulator) Cycle() { - pc := emulator.PC +func (emulator *Emulator) LoadFont() { + copy(emulator.Memory[0:], []uint8{ + 0xF0, 0x90, 0x90, 0x90, 0xF0, // 0 + 0x20, 0x60, 0x20, 0x20, 0x70, // 1 + 0xF0, 0x10, 0xF0, 0x80, 0xF0, // 2 + 0xF0, 0x10, 0xF0, 0x10, 0xF0, // 3 + 0x90, 0x90, 0xF0, 0x10, 0x10, // 4 + 0xF0, 0x80, 0xF0, 0x10, 0xF0, // 5 + 0xF0, 0x80, 0xF0, 0x90, 0xF0, // 6 + 0xF0, 0x10, 0x20, 0x40, 0x40, // 7 + 0xF0, 0x90, 0xF0, 0x90, 0xF0, // 8 + 0xF0, 0x90, 0xF0, 0x10, 0xF0, // 9 + 0xF0, 0x90, 0xF0, 0x90, 0x90, // A + 0xE0, 0x90, 0xE0, 0x90, 0xE0, // B + 0xF0, 0x80, 0x80, 0x80, 0xF0, // C + 0xE0, 0x90, 0x90, 0x90, 0xE0, // D + 0xF0, 0x80, 0xF0, 0x80, 0xF0, // E + 0xF0, 0x80, 0xF0, 0x80, 0x80, // F + }) +} +func (emulator *Emulator) Cycle() { emulator.DT = uint8(math.Max(0, float64(emulator.DT)-1)) emulator.ST = uint8(math.Max(0, float64(emulator.ST)-1)) @@ -89,8 +103,10 @@ func (emulator *Emulator) Cycle() { } case 0x1: // 1nnn - JP addr emulator.Jump(nnn) + return // skip PC increment case 0x2: // 2nnn - CALL addr emulator.Call(nnn) + return // skip PC increment case 0x3: // 3xkk - SE Vx, byte emulator.SkipEqualByte(x, kk) case 0x4: // 4xkk - SNE Vx, byte @@ -162,8 +178,5 @@ func (emulator *Emulator) Cycle() { } } - // if the program counter is unchanged and isn't a loop, read next instruction - if emulator.PC == pc && nnn != pc { - emulator.PC += InstructionSize - } + emulator.PC += InstructionSize } diff --git a/chip8/instructions.go b/chip8/instructions.go index c21cdf2..64b0876 100644 --- a/chip8/instructions.go +++ b/chip8/instructions.go @@ -4,6 +4,7 @@ import ( "image" "image/color" "image/draw" + _ "image/png" "math/rand" ) @@ -210,7 +211,7 @@ func (emulator *Emulator) Draw(x uint8, y uint8, n uint8) { sprite := emulator.Memory[emulator.I+uint16(row)] for col := uint8(0); col < width; col += 1 { - if (sprite & 0b1000_0000) == 0x1 { + if (sprite & 0b10000000) == 0b10000000 { px, py := int(emulator.V[x]+col), int(emulator.V[y]+row) // check for pixel collision diff --git a/cmd/chip8/main.go b/cmd/chip8/main.go new file mode 100644 index 0000000..3b47293 --- /dev/null +++ b/cmd/chip8/main.go @@ -0,0 +1,57 @@ +package main + +import ( + "io/ioutil" + "log" + "os" + + "github.com/hajimehoshi/ebiten" + "github.com/tangzero/chip8-emulator/chip8" +) + +const ( + ScreenScale = 20 + Width = chip8.Width * ScreenScale + Height = chip8.Height * ScreenScale +) + +type UI struct { + Emulator *chip8.Emulator +} + +func (ui *UI) Update(screen *ebiten.Image) error { + ui.Emulator.Cycle() + return nil +} + +func (ui *UI) Draw(screen *ebiten.Image) { + frame, err := ebiten.NewImageFromImage(ui.Emulator.Display, ebiten.FilterDefault) + if err != nil { + log.Fatal(err) + } + + op := new(ebiten.DrawImageOptions) + op.GeoM.Scale(ScreenScale, ScreenScale) + + screen.DrawImage(frame, op) +} + +func (ui *UI) Layout(outsideWidth, outsideHeight int) (int, int) { + return Width, Height +} + +func main() { + rom, err := ioutil.ReadFile(os.Args[1]) + if err != nil { + log.Fatal(err) + } + + ui := UI{Emulator: chip8.NewEmulator()} + ui.Emulator.LoadROM(rom) + + ebiten.SetWindowSize(Width, Height) + ebiten.SetWindowTitle("CHIP 8") + if err := ebiten.RunGame(&ui); err != nil { + log.Fatal(err) + } +} diff --git a/go.mod b/go.mod index 6621ede..1768482 100644 --- a/go.mod +++ b/go.mod @@ -4,7 +4,16 @@ go 1.17 require ( github.com/davecgh/go-spew v1.1.0 // indirect + github.com/go-gl/glfw/v3.3/glfw v0.0.0-20210727001814-0db043d8d5be // indirect + github.com/hajimehoshi/ebiten v1.12.12 // indirect + github.com/hajimehoshi/ebiten/v2 v2.2.5 // indirect + github.com/jezek/xgb v0.0.0-20210312150743-0e0f116e1240 // indirect github.com/pmezard/go-difflib v1.0.0 // indirect github.com/stretchr/testify v1.7.0 // indirect + golang.org/x/exp v0.0.0-20190731235908-ec7cb31e5a56 // indirect + golang.org/x/image v0.0.0-20210628002857-a66eb6448b8d // indirect + golang.org/x/mobile v0.0.0-20210902104108-5d9a33257ab5 // indirect + golang.org/x/sync v0.0.0-20210220032951-036812b2e83c // indirect + golang.org/x/sys v0.0.0-20210917161153-d61c044b1678 // indirect gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c // indirect ) diff --git a/go.sum b/go.sum index b380ae4..113a7c6 100644 --- a/go.sum +++ b/go.sum @@ -1,10 +1,105 @@ +github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo= github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8= github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= +github.com/go-gl/glfw/v3.3/glfw v0.0.0-20200707082815-5321531c36a2/go.mod h1:tQ2UAYgL5IevRw8kRxooKSPJfGvJ9fJQFa0TUsXzTg8= +github.com/go-gl/glfw/v3.3/glfw v0.0.0-20210727001814-0db043d8d5be h1:vEIVIuBApEBQTEJt19GfhoU+zFSV+sNTa9E9FdnRYfk= +github.com/go-gl/glfw/v3.3/glfw 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