.gitignore

@@ -1,2 +1,2 @@
 rom.gb
-imgui.ini
+

gb/cartridge.go

@@ -1,7 +1,6 @@
 package gb
 
 import (
-	"bytes"
 	"encoding/binary"
 	"io"
 	"log"
@@ -245,7 +244,7 @@ type Cartridge struct {
 }
 
 func Insert(filename string) Cartridge {
-	file, err := os.Open(filename)
+	file, err := os.Open("rom.gb")
 	if err != nil {
 		log.Fatal(err)
 	}
@@ -271,7 +270,7 @@ func Insert(filename string) Cartridge {
 	}
 
 	// Convert some header values
-	cartridge.Title = string(bytes.Trim(header.Title[:], "\x00"))
+	cartridge.Title = string(header.Title[:])
 	cartridge.Mapper = cartridgeTypes[header.CartridgeType]
 	if header.OldLicenseeCode == 0x33 {
 		// FIXME(m): Support new licensee codes

gb/cartridge_test.go

@@ -1,21 +0,0 @@
-package gb
-
-import (
-	"testing"
-
-	"github.com/stretchr/testify/assert"
-)
-
-func TestInsertCartridge(t *testing.T) {
-	cartridge := Insert("../rom.gb")
-	assert := assert.New(t)
-
-	assert.Equal(cartridge.Title, "SEIKEN DENSETSU")
-	assert.Equal(cartridge.Mapper, "MBC2+BATTERY")
-	assert.Equal(cartridge.Licensee, "Square")
-	assert.False(cartridge.SGBSupport, "SGB support should be false")
-	assert.Equal(cartridge.ROMSize, 256)
-	assert.Equal(cartridge.RAMSize, "0 - No RAM")
-	assert.Equal(cartridge.Destination, "Overseas only")
-	assert.Equal(cartridge.Version, 0)
-}

gb/cpu.go

@@ -1,21 +0,0 @@
-package gb
-
-type Cpu struct {
-	A     uint8
-	Flags uint8
-	BC    uint16
-	DE    uint16
-	HL    uint16
-	SP    uint16
-	PC    uint16
-}
-
-func Reset() Cpu {
-	cpu := Cpu{}
-
-	return cpu
-}
-
-func Tick(cpu *Cpu) {
-	cpu.PC++
-}

go.mod

@@ -1,14 +1,3 @@
 module gb-player
 
 go 1.24.5
-
-require (
-	github.com/AllenDang/cimgui-go v1.3.1
-	github.com/stretchr/testify v1.10.0
-)
-
-require (
-	github.com/davecgh/go-spew v1.1.1 // indirect
-	github.com/pmezard/go-difflib v1.0.0 // indirect
-	gopkg.in/yaml.v3 v3.0.1 // indirect
-)

go.sum

@@ -1,12 +0,0 @@
-github.com/AllenDang/cimgui-go v1.3.1 h1:2f33a7GHJwRofH0CRQbUTXywazfph/K5LQLKyOBv24k=
-github.com/AllenDang/cimgui-go v1.3.1/go.mod h1:Fuj3G2E3zd2bMQxmhuSPSFFl41MwS+MhyZ6DHgYq/YM=
-github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
-github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
-github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
-github.com/stretchr/testify v1.10.0 h1:Xv5erBjTwe/5IxqUQTdXv5kgmIvbHo3QQyRwhJsOfJA=
-github.com/stretchr/testify v1.10.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
-gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
-gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
-gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

main.go

@@ -2,81 +2,17 @@ package main
 
 import (
 	"fmt"
-	"log"
-	"runtime"
-
 	"gb-player/gb"
-
-	"github.com/AllenDang/cimgui-go/backend"
-	"github.com/AllenDang/cimgui-go/backend/sdlbackend"
-	"github.com/AllenDang/cimgui-go/imgui"
 )
 
-var currentBackend backend.Backend[sdlbackend.SDLWindowFlags]
-
-func init() {
-	runtime.LockOSThread()
-}
-
-func showDebugWindow() {
-	imgui.Text(fmt.Sprintf("Framerate: %.1f FPS", imgui.CurrentIO().Framerate()))
-}
-
-func showROMWindow(cartridge *gb.Cartridge) {
-	imgui.Begin("ROM")
-
-	imgui.Text(fmt.Sprintf("Title: %s", cartridge.Title))
-	imgui.Text(fmt.Sprintf("Mapper: %s", cartridge.Mapper))
-	imgui.Text(fmt.Sprintf("Licensee: %s", cartridge.Licensee))
-	if cartridge.SGBSupport {
-		imgui.Text("Super Game Boy support?: Yes")
-	} else {
-		imgui.Text("Super Game Boy support?: No")
-	}
-	imgui.Text(fmt.Sprintf("ROM size: %d bytes", cartridge.ROMSize))
-	imgui.Text(fmt.Sprintf("RAM size: %s", cartridge.RAMSize))
-	imgui.Text(fmt.Sprintf("Publication: %s", cartridge.Destination))
-	imgui.Text(fmt.Sprintf("ROM version: %d", cartridge.Version))
-
-	imgui.End()
-}
-
-func showCPUWindow(cpu *gb.Cpu) {
-	imgui.Begin("CPU")
-
-	imgui.Text(fmt.Sprintf("PC: %d", cpu.PC))
-
-	imgui.End()
-}
-
 func main() {
-	currentBackend, err := backend.CreateBackend(sdlbackend.NewSDLBackend())
-	if err != nil {
-		log.Fatal(err)
-	}
-
-	currentBackend.SetBgColor(imgui.NewVec4(0.45, 0.55, 0.6, 1.0))
-
-	currentBackend.CreateWindow("GB Player", 1200, 900)
-
-	currentBackend.SetDropCallback(func(p []string) {
-		fmt.Printf("drop triggered: %v", p)
-	})
-
-	currentBackend.SetCloseCallback(func() {
-		fmt.Println("window is closing")
-	})
-
 	cartridge := gb.Insert("rom.gb")
-	cpu := gb.Reset()
+	fmt.Println("Title:", cartridge.Title)
-
+	fmt.Println("Mapper:", cartridge.Mapper)
-	currentBackend.Run(func() {
+	fmt.Println("Licensee:", cartridge.Licensee)
-		imgui.ClearSizeCallbackPool()
+	fmt.Println("Super Game Boy support?", cartridge.SGBSupport)
-
+	fmt.Println("ROM size:", cartridge.ROMSize, "bytes")
-		gb.Tick(&cpu)
+	fmt.Println("RAM size:", cartridge.RAMSize)
-
+	fmt.Println("Publication destination:", cartridge.Destination)
-		showDebugWindow()
+	fmt.Println("ROM version:", cartridge.Version)
-		showROMWindow(&cartridge)
-		showCPUWindow(&cpu)
-	})
 }