Support 3 gameshark modes.

Author: trekawek

core/src/main/java/eu/rekawek/coffeegb/core/genie/GameGeniePatch.java

@@ -9,7 +9,7 @@ public int getAddress() {
     }
 
     @Override
-    public boolean accepts(AddressSpace addressSpace, boolean gbc) {
+    public boolean accepts(AddressSpace addressSpace, int ramBank, boolean gbc) {
         if (oldData == -1) {
             return true;
         }

core/src/main/java/eu/rekawek/coffeegb/core/genie/GameSharkPatch.java

@@ -3,16 +3,24 @@
 import eu.rekawek.coffeegb.core.AddressSpace;
 import eu.rekawek.coffeegb.core.memory.GbcRam;
 
-public record GameSharkPatch(int bank, int address, int data) implements Patch {
+public record GameSharkPatch(int mode, int bank, int address, int data) implements Patch {
     @Override
     public int getAddress() {
         return address;
     }
 
     @Override
-    public boolean accepts(AddressSpace addressSpace, boolean gbc) {
-        var currentBank = gbc ? Math.max(addressSpace.getByte(GbcRam.SVBK) & 0x07, 1) : 1;
-        return currentBank == bank;
+    public boolean accepts(AddressSpace addressSpace, int ramBank, boolean gbc) {
+        if (mode == 0 && bank == 1) {
+            return true;
+        }
+        if (mode == 8 && bank == ramBank) {
+            return true;
+        }
+        if (mode == 9) {
+            return Math.max(1, bank) == (gbc ? Math.max(addressSpace.getByte(GbcRam.SVBK) & 0x07, 1) : 1);
+        }
+        return false;
     }
 
     @Override

core/src/main/java/eu/rekawek/coffeegb/core/genie/Genie.java

@@ -18,6 +18,8 @@ public class Genie implements AddressSpace, Originator<Genie> {
 
     private final boolean gbc;
 
+    private int ramBank;
+
     public Genie(AddressSpace delegate, boolean gbc) {
         this.delegate = delegate;
         this.gbc = gbc;
@@ -38,6 +40,9 @@ public boolean accepts(int address) {
 
     @Override
     public void setByte(int address, int value) {
+        if (address >= 0x4000 && address <= 0x5fff) {
+            ramBank = value & 0xf;
+        }
         delegate.setByte(address, value);
     }
 
@@ -46,7 +51,7 @@ public int getByte(int address) {
         var value = delegate.getByte(address);
         if (patches.containsKey(address)) {
             for (Patch p : patches.get(address)) {
-                if (p.accepts(delegate, gbc)) {
+                if (p.accepts(delegate, ramBank, gbc)) {
                     return p.getValue();
                 }
             }

core/src/main/java/eu/rekawek/coffeegb/core/genie/Patch.java

@@ -8,7 +8,7 @@ public interface Patch extends Serializable {
 
     int getAddress();
 
-    boolean accepts(AddressSpace addressSpace, boolean gbc);
+    boolean accepts(AddressSpace addressSpace, int ramBank, boolean gbc);
 
     int getValue();
 }

core/src/main/java/eu/rekawek/coffeegb/core/genie/PatchFactory.java

@@ -54,10 +54,11 @@ private static GameGeniePatch parseGameGenieShortCode(String code) {
 
     private static GameSharkPatch parseGameSharkCode(String code) {
         var c = code.toLowerCase().toCharArray();
-        var bank = parse(c, 0, 1);
+        var mode = parse(c, 0);
+        var bank = parse(c, 1);
         var newData = parse(c, 2, 3);
         var address = parse(c, 6, 7, 4, 5);
-        return new GameSharkPatch(bank, address, newData);
+        return new GameSharkPatch(mode, bank, address, newData);
     }
 
     private static int parse(char[] code, int... offsets) {