protected override void LoadContent()
{
m_sprite_batch = new SpriteBatch(GraphicsDevice);
m_white_texture = Content.Load <Texture2D>("White");
m_crt_effect_border = Content.Load <Effect>("crt");
m_crt_effect_border.Parameters["Viewport"].SetValue(new Vector2(GraphicsDevice.Viewport.Width, GraphicsDevice.Viewport.Height));
m_crt_effect_border.Parameters["TextureHeight"].SetValue(GraphicsDevice.Viewport.Height / CPC_PIXEL_HEIGHT);
m_crt_effect_border.Parameters["ScreenHeight"].SetValue(GraphicsDevice.Viewport.Height);
m_crt_effect_screen = m_crt_effect_border.Clone();
m_crt_effect_screen.Parameters["Viewport"].SetValue(new Vector2(GraphicsDevice.Viewport.Width, GraphicsDevice.Viewport.Height));
m_crt_effect_screen.Parameters["TextureHeight"].SetValue(TextureDisplay.MAX_SCREEN_HEIGHT);
m_crt_effect_screen.Parameters["ScreenHeight"].SetValue(m_screen_rect.Height);
m_texture_display = new TextureDisplay(GraphicsDevice);
m_audio = new Audio();
m_emulator = new CPC.Emulator(m_audio, m_texture_display);
for (PlayerIndex index = PlayerIndex.One; index <= PlayerIndex.Four; index++)
{
// For now all gamepads respond as joystick 0
m_emulator.Keyboard.AssignJoystick(new CPC.Joystick(0, index));
}
// Use CPC464 ROM only for now
BinaryFile rom_file = LoadBinaryFile("rom\\CPC464");
m_emulator.Memory.LoadROM(CPC.ROM.LOWER_ROM_INDEX, rom_file.m_data, 0);
m_emulator.Memory.LoadROM(CPC.ROM.BASIC_ROM_INDEX, rom_file.m_data, CPC.ROM.ROM_SIZE);
// List snapshots that can be played
GetSnapshotFileList();
List <string> pause_menu_options = new List <string>();
pause_menu_options.Add("Unpause"); //Resume
pause_menu_options.Add("Load Snapshot"); //LoadSnapshot
pause_menu_options.Add("Reset CPC"); //Reset
pause_menu_options.Add("Toggle CRT Shader"); //ToggleCRTShader
pause_menu_options.Add("Throttle Speed"); //ThrottleSpeed
pause_menu_options.Add("Quit"); //Quit
m_pause_menu.SetupMenu("XNACPC - Gavin Pugh 2011", pause_menu_options, PauseCallback);
m_pause_menu.SetupMenuToggle((int)EPauseMenuOptions.ThrottleSpeed, m_throttle_speed);
m_pause_menu.SetupMenuToggle((int)EPauseMenuOptions.ToggleCRTShader, m_use_crt_shader);
m_snapshot_menu.SetupMenu("Choose a snapshot", m_snapshot_files, SnapshotCallback);
if (m_startup_load_sna != null)
{
// Check the sna list. Do a case-insensitive compare to check it's a valid .sna
foreach (string snaFile in m_snapshot_files)
{
if (String.Compare(snaFile, m_startup_load_sna, StringComparison.OrdinalIgnoreCase) == 0)
{
// Got it! Now just load it in.
LoadSnapshotFile(m_startup_load_sna);
break;
}
}
}
GC.Collect();
m_timer.Reset();
m_timer.Start();
base.LoadContent();
}
public void LoadSnapshot(Emulator emulator)
{
// Check header
for (int i = 0; i < ID_STRING.Length; i++)
{
Debug.Assert(ID_STRING[i] == GetByte(Indices.IDString + i));
}
if (GetByte(Indices.Version) < 3)
{
// Use the hack for v1/2 snapshots that don't have CRTC/GA timing info
emulator.PreSnapshotHack();
}
// Z80 processor state
emulator.Processor.F(GetByte(Indices.RegisterF));
emulator.Processor.A(GetByte(Indices.RegisterA));
emulator.Processor.C(GetByte(Indices.RegisterC));
emulator.Processor.B(GetByte(Indices.RegisterB));
emulator.Processor.E(GetByte(Indices.RegisterE));
emulator.Processor.D(GetByte(Indices.RegisterD));
emulator.Processor.L(GetByte(Indices.RegisterL));
emulator.Processor.H(GetByte(Indices.RegisterH));
emulator.Processor.R(GetByte(Indices.RegisterR));
emulator.Processor.I(GetByte(Indices.RegisterI));
emulator.Processor.IFF1(GetByte(Indices.RegisterIFF0) != 0);
emulator.Processor.IFF2(GetByte(Indices.RegisterIFF1) != 0);
emulator.Processor.IX(GetWord(Indices.RegisterIXHigh, Indices.RegisterIXLow));
emulator.Processor.IY(GetWord(Indices.RegisterIYHigh, Indices.RegisterIYLow));
emulator.Processor.SP(GetWord(Indices.RegisterSPHigh, Indices.RegisterSPLow));
emulator.Processor.PC(GetWord(Indices.RegisterPCHigh, Indices.RegisterPCLow));
emulator.Processor.IM(GetByte(Indices.InterruptMode));
emulator.Processor.SetAltAF(GetWord(Indices.RegisterAltA, Indices.RegisterAltF));
emulator.Processor.SetAltBC(GetWord(Indices.RegisterAltB, Indices.RegisterAltC));
emulator.Processor.SetAltDE(GetWord(Indices.RegisterAltD, Indices.RegisterAltE));
emulator.Processor.SetAltHL(GetWord(Indices.RegisterAltH, Indices.RegisterAltL));
// Gate Array
emulator.GateArray.SetCurrentPen(GetByte(Indices.GASelectedPen));
for (int i = 0; i < GateArray.NUM_PEN_SETTINGS; i++)
{
emulator.GateArray.SetPenColour(i, GetByte(Indices.GAPenColours + i));
}
emulator.GateArray.ScreenModeAndROMSelect(GetByte(Indices.GAMultiConfig));
emulator.Memory.RAMBankSelect(GetByte(Indices.GARAMSelect));
// CRTC
emulator.CRTC.SelectRegister((CRTC.Register)GetByte(Indices.CRTCSelReg));
for (int i = 0; i < CRTC.NUM_REGISTERS; i++)
{
emulator.CRTC.SetRegister((CRTC.Register)i, GetByte(Indices.CRTCRegData + i));
}
// ROM Select
emulator.Memory.SelectUpperROM(GetByte(Indices.ROMSelect));
// PPI
emulator.PPI.WritePortC(GetByte(Indices.PPIControl));
emulator.PPI.SetPortA(GetByte(Indices.PPIPortA));
emulator.PPI.SetPortB(GetByte(Indices.PPIPortB));
emulator.PPI.SetPortC(GetByte(Indices.PPIPortC));
// PSG
emulator.PSG.SelectRegister((PSG.Register)GetByte(Indices.PSGSelRegister));
for (int i = 0; i < PSG.NUM_REGISTERS; i++)
{
emulator.PSG.WriteRegister((PSG.Register)i, GetByte(Indices.PSGRegData + i));
}
// Extra stuff for v3 snapshots
if (GetByte(Indices.Version) >= 3)
{
emulator.CRTC.SetTiming(
GetByte(Indices.CRTCHorizChar),
GetByte(Indices.CRTCVertChar),
GetByte(Indices.CRTCScanline),
GetByte(Indices.CRTCHSyncCount),
GetByte(Indices.CRTCVSyncCount),
(GetByte(Indices.CRTCStateFlags) & (1 << 1)) != 0, //< HSync Active
(GetByte(Indices.CRTCStateFlags) & (1 << 0)) != 0 //< VSync Active
);
emulator.GateArray.SetCounters(
GetByte(Indices.GAScanlineCount),
GetByte(Indices.GAVSyncDelay)
);
emulator.Processor.SetInterruptRequest(GetByte(Indices.CPUIRQFlag) != 0);
}
// Memory Dump
int mem_size = GetWord(Indices.MemDumpSizeHigh, Indices.MemDumpSizeLow);
Debug.Assert((mem_size == 64) || (mem_size == 128)); //< NOTE: 128k not currently supported
emulator.Memory.SetRAM(m_data, (int)Indices.MemDump, mem_size);
}
