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main.go
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main.go
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package main
import (
"fmt"
"os"
"strconv"
"time"
"github.com/Ruenzuo/nana/emulator"
"github.com/veandco/go-sdl2/sdl"
)
const (
width = 160
height = 144
scale = 5
)
var (
e *emulator.Emulator
ticker *time.Ticker
done chan struct{}
)
func update(r *sdl.Renderer, t *sdl.Texture) error {
for event := sdl.PollEvent(); event != nil; event = sdl.PollEvent() {
switch event.(type) {
case *sdl.QuitEvent:
ticker.Stop()
close(done)
break
case *sdl.KeyboardEvent:
event := event.(*sdl.KeyboardEvent)
e.HandleKeyboardEvent(event)
}
}
e.EmulateFrame()
pixels, _, _ := t.Lock(nil)
for y := 0; y < height; y++ {
for x := 0; x < width; x++ {
position := y*width + x
pixels[(position*4 + 0)] = e.ScreenData[x][y][0]
pixels[(position*4 + 1)] = e.ScreenData[x][y][1]
pixels[(position*4 + 2)] = e.ScreenData[x][y][2]
pixels[(position*4 + 3)] = 255
}
}
t.Unlock()
r.Clear()
r.Copy(t, nil, nil)
r.Present()
return nil
}
func main() {
gameArg := os.Args[1]
_, okDebug := os.LookupEnv("NANA_DEBUG")
_, okLCDState := os.LookupEnv("NANA_LCD_STATE_DEBUG")
_, okMemoryAccess := os.LookupEnv("NANA_MEMORY_ACCESS_DEBUG")
_, okEnableTestPanics := os.LookupEnv("NANA_ENABLE_TEST_PANICS")
_, okEnableRewind := os.LookupEnv("NANA_ENABLE_REWIND")
maxCyclesEnv, okMaxCycles := os.LookupEnv("NANA_MAX_CYCLES")
maxCycles := 0
if okMaxCycles {
maxCyclesInt, err := strconv.Atoi(maxCyclesEnv)
if err != nil {
panic(err)
}
maxCycles = maxCyclesInt
}
e = emulator.NewEmulator(okDebug, okLCDState, okMemoryAccess, okEnableTestPanics, okEnableRewind, maxCycles)
e.LoadCartridge(gameArg)
e.LoadState()
if err := sdl.Init(sdl.INIT_EVERYTHING); err != nil {
panic(err)
}
defer sdl.Quit()
window, err := sdl.CreateWindow(fmt.Sprintf("ナナ - %s", gameArg), sdl.WINDOWPOS_UNDEFINED, sdl.WINDOWPOS_UNDEFINED, width*scale, height*scale, sdl.WINDOW_OPENGL)
if err != nil {
panic(err)
}
defer window.Destroy()
renderer, err := sdl.CreateRenderer(window, -1, 0)
if err != nil {
panic(err)
}
defer renderer.Destroy()
renderer.SetScale(scale, scale)
texture, err := renderer.CreateTexture(sdl.PIXELFORMAT_ABGR8888, sdl.TEXTUREACCESS_STREAMING, width, height)
if err != nil {
panic(err)
}
defer texture.Destroy()
spec := &sdl.AudioSpec{
Freq: emulator.SampleRate,
Format: sdl.AUDIO_U8,
Channels: 2,
Samples: emulator.SoundBufferSize,
}
if err := sdl.OpenAudio(spec, nil); err != nil {
panic(err)
}
sdl.PauseAudio(false)
done = make(chan struct{})
ticker = time.NewTicker(1000 * time.Millisecond / 60)
loop:
for {
select {
case <-ticker.C:
update(renderer, texture)
case <-done:
break loop
}
}
sdl.CloseAudio()
}