Remove some useless testing code, fix latency issue after loading saves multiple times

Author: garrettgu10

src/org/the429ers/gameboy/CPU.java

@@ -25,12 +25,6 @@ public CPU(MMU mem) {
         mem.setCPU(this);
         timer = new Timer(mem);
     }
-
-    public CPU() {
-        mem = new MMU();
-        mem.setCPU(this);
-        timer = new Timer(mem);
-    }
 
     public void setMMU(MMU mmu) {
         this.mem = mmu;
@@ -55,18 +49,6 @@ public int getClockCycleDelta() {
     public static final int NOJUMP = -1;
     public static final int RELJUMP = 0;
     public static final int ABSJUMP = 1;
-
-    public static void main(String[] args) throws IOException {
-        //System.setOut(new PrintStream(new File("test.out")));
-        
-        new CPU().test();
-    }
-    
-    public void test() {
-        while(regs.PC.read() < 256){
-            executeOneInstruction(true, false);
-        }
-    }
 
     public void coreDump() {
         int opcode = mem.readByte(regs.PC.read());

src/org/the429ers/gameboy/GameBoy.java

@@ -261,7 +261,7 @@ public void switchRom(String newRom) {
         this.sourceDL = mmu.soundChip.getSourceDL();
         this.romFileName = newRom;
         if(mmu != null) mmu.cleanUp();
-        mmu = new MMU(newRom);
+        mmu = new MMU(newRom, sourceDL);
         this.isCGB = mmu.isCGB();
         cpu = new CPU(mmu);
         if (isCGB) {
@@ -275,7 +275,6 @@ public void switchRom(String newRom) {
             ppu = new PPU(mmu, gbs);
         }
         mmu.setPPU(ppu);
-        mmu.soundChip.setSourceDL(this.sourceDL);
         cable = new LinkCable(mmu, cpu.interruptHandler);
         joypad = new Joypad(mmu, cpu.interruptHandler);
         gbs.addKeyListener(joypad);

src/org/the429ers/gameboy/MMU.java

@@ -1,5 +1,6 @@
 package org.the429ers.gameboy;
 
+import javax.sound.sampled.SourceDataLine;
 import java.io.Serializable;
 import java.util.Base64;
 
@@ -51,7 +52,7 @@ public class MMU implements Serializable {
     private ColorPaletteManager spritePaletteManager;
     private TileSetManager tileSetManager;
     private SpriteManager spriteManager;
-    SoundChip soundChip = new SoundChip();
+    SoundChip soundChip;
 
     public void setSpriteManager(SpriteManager manager) {
         this.spriteManager = manager;
@@ -89,14 +90,17 @@ public Cartridge getROM() {
         return this.rom;
     }
 
-    public MMU() {
-        //no need to copy boot rom since that is intercepted by readByte
-    }
-    
     // Load rom from disk
     public MMU(String fileName) {
         this.rom = Cartridge.fromFile(fileName);
         this.isCGB = rom != null && rom.isGBC();
+        this.soundChip = new SoundChip();
+    }
+    
+    public MMU(String fileName, SourceDataLine sourceDL){
+        this.rom = Cartridge.fromFile(fileName);
+        this.isCGB = rom != null && rom.isGBC();
+        this.soundChip = new SoundChip(sourceDL);
     }
 
     public void cleanUp() {

src/org/the429ers/gameboy/SoundChannel.java

@@ -28,7 +28,7 @@ class SoundChip implements Serializable {
     public static final int WAVE = 2;
     public static final int NOISE = 3;
 
-    transient SourceDataLine sourceDL;
+    private transient SourceDataLine sourceDL;
 
     byte[] masterBuffer = new byte[6 * SAMPLES_PER_FRAME];
     byte[] tempBuffer = new byte[3 * SAMPLES_PER_FRAME];
@@ -44,14 +44,13 @@ class SoundChip implements Serializable {
 
     public void setSourceDL(SourceDataLine sourceDL){
         this.sourceDL = sourceDL;
-        this.totalSamplesWritten = sourceDL.getLongFramePosition();
     }
 
     public SourceDataLine getSourceDL(){
         return this.sourceDL;
     }
 
-    SoundChip() {
+    public SoundChip() {
         try {
             sourceDL = AudioSystem.getSourceDataLine(AUDIO_FORMAT);
             sourceDL.open(AUDIO_FORMAT);
@@ -61,6 +60,10 @@ public SourceDataLine getSourceDL(){
         }
     }
 
+    public SoundChip(SourceDataLine sourceDL) {
+        this.sourceDL = sourceDL;
+    }
+    
     //handle the NR51 register
     public void handleStereo(int val) {
         for(int i = 0; i < 4; i++){
@@ -85,6 +88,10 @@ public void tick() {
         int samplesToWrite = Math.max(0, (int)(3 * SAMPLES_PER_FRAME - residualSamples)); //try to keep 3 frames buffered at all times
         samplesToWrite = Math.min(sourceDL.available() / 2, Math.min(3 * SAMPLES_PER_FRAME, samplesToWrite)); //never want to block here
         totalSamplesWritten += samplesToWrite;
+        if(totalSamplesWritten < sourceDL.getLongFramePosition()) {
+            sourceDL.drain();
+            totalSamplesWritten = sourceDL.getLongFramePosition();
+        }
 
         Arrays.fill(masterBuffer, (byte) 0);