view java/src/com/aurellem/gb/Gb.java @ 83:95cb2152d7cd

fleshing out functional gb interface
author Robert McIntyre <rlm@mit.edu>
date Fri, 09 Mar 2012 19:18:00 -0600
parents db8e0a563c8e
children 1ff2c546f5ad
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line source
1 package com.aurellem.gb;
3 import java.nio.ByteBuffer;
4 import java.nio.IntBuffer;
5 import java.nio.ByteOrder;
7 public class Gb {
10 public Gb(){}
13 /**
14 * Hello World! This is just to test the native interface.
15 */
16 public static native void sayHello();
18 /**
19 * Run the emulator on a given rom
20 * @param rom - the name of the rom.
21 */
22 public static native void startEmulator(String rom);
25 public static void loadVBA(){
26 System.loadLibrary("vba");
27 }
29 public static native void step();
31 public static native void nstep(int keymask);
33 public static void step(int keymask){
34 if (-1 == keymask) {step();}
35 else {nstep(keymask);}}
37 public static native void shutdown();
39 public static native long saveState(ByteBuffer buffer, int size);
41 public static native void loadState(ByteBuffer buffer, int size);
43 public static final int MAX_SAVE_SIZE = 20000;
45 public static ByteBuffer createDirectByteBuffer(int capacity){
46 byte[] zeros = new byte[capacity];
47 ByteBuffer buf =
48 ByteBuffer.allocateDirect(capacity)
49 .order(ByteOrder.nativeOrder());
50 buf.put(zeros);
51 buf.clear();
52 return buf;
53 }
55 public static ByteBuffer saveBuffer(){
56 return createDirectByteBuffer(MAX_SAVE_SIZE);
57 }
59 public static ByteBuffer saveState(){
60 ByteBuffer buf = saveBuffer();
62 saveState(buf, buf.capacity());
64 // determine the extent of the saved data
65 int position = buf.capacity() - 1;
66 for (int i = position; i > 0; i--){
67 if (0 != buf.get(i)){
68 position = i;
69 break;
70 }}
71 byte[] saveArray = new byte[position];
72 ByteBuffer save = createDirectByteBuffer(position);
73 buf.get(saveArray, 0 , position);
74 save.put(saveArray);
75 save.rewind();
76 return save;
77 }
79 public static void loadState(ByteBuffer saveState){
80 loadState(saveState, MAX_SAVE_SIZE);
81 }
83 public static native int getROMSize();
84 public static native int getRAMSize();
87 public static final int WRAM_SIZE = 0x8000;
89 public static final int VRAM_SIZE = 0x4000;
91 public static final int NUM_REGISTERS = 27;
93 public static native void getRAM(int[] store);
95 public static native void getROM(int[] store);
97 public static native void getWRAM(int[] store);
99 public static native void getVRAM(int[] store);
101 public static native void getRegisters(int[] store);
102 }