107 lines
2.4 KiB
Go
107 lines
2.4 KiB
Go
// Simplest possible Apple II that will possibly boot. ~ (tilde) to quit.
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package main
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import (
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"fmt"
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"time"
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"github.com/nsf/termbox-go"
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"github.com/zellyn/goapple2"
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"github.com/zellyn/goapple2/util"
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"github.com/zellyn/goapple2/videoscan"
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)
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// Mapping of screen bytes to character values
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var AppleChars = "@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_ !\"#$%&'()*+,-./0123456789:;<=>?"
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// Translate to termbox
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func translateToTermbox(value byte) (char rune, fg, bg termbox.Attribute) {
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// BUG(zellyn): change this to return char, MODE_ENUM.
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ch := rune(AppleChars[value&0x3F])
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if value&0x80 > 0 {
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return ch, termbox.ColorGreen, termbox.ColorBlack
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}
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return ch, termbox.ColorGreen, termbox.ColorBlack + termbox.AttrReverse
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}
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func termboxToAppleKeyboard(ev termbox.Event) (key byte, err error) {
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if ev.Key > 0 && ev.Key <= 32 {
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return byte(ev.Key), nil
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}
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if ev.Ch >= '!' && ev.Ch <= 'Z' || ev.Ch == '^' {
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return byte(ev.Ch), nil
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}
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if ev.Ch >= 'a' && ev.Ch <= 'z' {
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return byte(ev.Ch - 'a' + 'A'), nil
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}
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switch ev.Key {
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case termbox.KeyBackspace2:
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return 8, nil // backspace
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case termbox.KeyArrowLeft:
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return 8, nil // left arrow
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case termbox.KeyArrowRight:
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return 21, nil // right arrow
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}
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return 0, fmt.Errorf("hi")
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}
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func ProcessEvents(events chan termbox.Event, a2 *goapple2.Apple2) bool {
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select {
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case ev := <-events:
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if ev.Type == termbox.EventKey && ev.Ch == '~' {
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return true
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}
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if ev.Type == termbox.EventKey {
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if key, err := termboxToAppleKeyboard(ev); err == nil {
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a2.Keypress(key)
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}
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}
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default:
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}
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return false
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}
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type TextPlotter int
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func (p TextPlotter) Plot(data videoscan.PlotData) {
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y := int(data.Row / 8)
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x := int(data.Column)
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value := data.RawData
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ch, fg, bg := translateToTermbox(value)
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termbox.SetCell(x+1, y+1, ch, fg, bg)
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if x == 39 && data.Row == 191 {
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termbox.Flush()
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}
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}
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// Run the emulator
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func RunEmulator() {
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rom := util.ReadRomOrDie("../data/roms/apple2+.rom")
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plotter := TextPlotter(0)
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var charRom [2048]byte
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a2 := goapple2.NewApple2(plotter, rom, charRom)
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if err := termbox.Init(); err != nil {
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panic(err)
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}
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events := make(chan termbox.Event)
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go func() {
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for {
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events <- termbox.PollEvent()
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}
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}()
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for !ProcessEvents(events, a2) {
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err := a2.Step()
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if err != nil {
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fmt.Println(err)
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break
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}
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time.Sleep(1 * time.Nanosecond) // So the keyboard-reading goroutines can run
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}
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termbox.Close()
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}
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func main() {
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RunEmulator()
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}
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