mirror of
https://github.com/freewilll/apple2-go.git
synced 2024-09-29 14:57:33 +00:00
8284073beb
Every frame sends a bunch of audio samples in a channel. This channel is consumed by the audio Read() function which is called asynchronously. There's all kinds of timing issues where the audio/video are not aligned. Issues: - There's a large delay between the audio being produced and it being played - Something with the timing is wrong. The first not of lemonade stand and the system beep are both incorrect. Changing the CPU frequency fixes it for one but not for the other. This means something must be wrong in the cycle counting. Also added FPS display that can be toggled with ctrl-alt-F.
110 lines
2.8 KiB
Go
110 lines
2.8 KiB
Go
package main
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import (
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"flag"
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"fmt"
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"github.com/hajimehoshi/ebiten"
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"mos6502go/audio"
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"mos6502go/cpu"
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"mos6502go/keyboard"
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"mos6502go/mmu"
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"mos6502go/system"
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"mos6502go/utils"
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"mos6502go/video"
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)
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const (
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screenSizeFactor = 1 // Factor by which the whole screen is resized
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textVideoMemory = 0x400 // Base location of page 1 text video memory
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flashFrames = 8 // Number of frames when FLASH mode is toggled
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)
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var showInstructions *bool
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var disableFirmwareWait *bool
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var resetKeysDown bool
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var fpsKeysDown bool
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var breakAddress *uint16
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func reset() {
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bootVector := 0xfffc
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lsb := mmu.PageTable[bootVector>>8][bootVector&0xff] // TODO move readMemory to mmu
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msb := mmu.PageTable[(bootVector+1)>>8][(bootVector+1)&0xff]
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cpu.State.PC = uint16(lsb) + uint16(msb)<<8
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}
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// checkSpecialKeys checks
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// - ctrl-alt-R has been pressed. Releasing the R does a warm reset
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// - ctrl-alt-F has been pressed, toggling FPS display
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func checkSpecialKeys() {
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if ebiten.IsKeyPressed(ebiten.KeyControl) && ebiten.IsKeyPressed(ebiten.KeyAlt) && ebiten.IsKeyPressed(ebiten.KeyR) {
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resetKeysDown = true
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} else if ebiten.IsKeyPressed(ebiten.KeyControl) && ebiten.IsKeyPressed(ebiten.KeyAlt) && !ebiten.IsKeyPressed(ebiten.KeyR) && resetKeysDown {
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resetKeysDown = false
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reset()
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} else {
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resetKeysDown = false
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}
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if ebiten.IsKeyPressed(ebiten.KeyControl) && ebiten.IsKeyPressed(ebiten.KeyAlt) && ebiten.IsKeyPressed(ebiten.KeyF) {
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fpsKeysDown = true
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} else if ebiten.IsKeyPressed(ebiten.KeyControl) && ebiten.IsKeyPressed(ebiten.KeyAlt) && !ebiten.IsKeyPressed(ebiten.KeyF) && fpsKeysDown {
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fpsKeysDown = false
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video.ShowFPS = !video.ShowFPS
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fmt.Println("Toggled")
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} else {
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fpsKeysDown = false
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}
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}
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func update(screen *ebiten.Image) error {
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keyboard.Poll()
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checkSpecialKeys()
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system.FrameCycles = 0
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system.LastAudioCycles = 0
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cpu.Run(*showInstructions, breakAddress, *disableFirmwareWait, system.CpuFrequency/60)
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audio.ForwardToFrameCycle()
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system.Cycles += system.FrameCycles
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system.FrameCycles = 0
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return video.DrawScreen(screen)
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}
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func main() {
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showInstructions = flag.Bool("show-instructions", false, "Show instructions code while running")
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disableFirmwareWait = flag.Bool("disable-wait", false, "Ignore JSRs to firmware wait at $FCA8")
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breakAddressString := flag.String("break", "", "Break on address")
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mute := flag.Bool("mute", false, "Mute sound")
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diskImage := flag.String("image", "", "Disk Image")
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flag.Parse()
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breakAddress = utils.DecodeCmdLineAddress(breakAddressString)
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ebiten.SetRunnableInBackground(true)
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cpu.InitInstructionDecoder()
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mmu.InitRAM()
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mmu.InitApple2eROM()
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mmu.InitIO()
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if *diskImage != "" {
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mmu.ReadDiskImage(*diskImage)
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}
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cpu.Init()
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keyboard.Init()
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video.Init()
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audio.Init()
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audio.Mute = *mute
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system.Init()
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reset()
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ebiten.Run(update, 280*screenSizeFactor, 192*screenSizeFactor, 2, "Apple //e")
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}
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