public static void renderScan()
{
// VRAM offset for the tile map
UInt16 mapOffs = (UInt16)(curLine + yScrl);
mapOffs &= 0xFF;
mapOffs >>= 3;
mapOffs <<= 5;
UInt16 lineOffs = (UInt16)((xScrl >> 3) & 31);
UInt16 index = BgTileMapSelect ? MMU.readByte((UInt16)((mapOffs + lineOffs) + 0x8800)) : MMU.readByte((UInt16)((mapOffs + lineOffs) + 0x8800));
// Where in the tile to start
byte x = (byte)(xScrl & 7);
byte y = (byte)((curLine + yScrl) & 7);
if (!TileDataSelect)
{
if (index < 128)
{
index += 128;
}
else
{
index -= 128;
}
}
for (int i = 0; i < 160; i++)
{
//get 16-bit tile data
UInt16 tile = TileDataSelect ? MMU.readWord((UInt16)((index << 1) + 0x8000)) : MMU.readWord((UInt16)((index << 1) + 0x8800));
//mask all but 0xnn where n = 'pixel number'
//then add the 2 bits
byte a = (byte)(((tile & 0xFF) & (1 << x)) >> x);
byte b = (byte)(((tile >> 8) & (1 << x)) >> x);
byte c = (byte)(a + (b >> 1));
// Write to linebuffer
GPU.lineBuffer[i] = c;
// Increment x pixel within tile
x++;
if (x == 8)
{
//Reset x pixel within tile, get new tile data
x = 0;
lineOffs = (UInt16)((lineOffs + 1) & 31);
index = BgTileMapSelect ? vram[(mapOffs + lineOffs) + 0x1C00] : vram[(mapOffs + lineOffs) + 0x1800];
}
}
}
public static UInt16 readWord(UInt16 addr)
{
return((UInt16)(MMU.readByte(addr) + (MMU.readByte((UInt16)(addr + 1)) << 8)));
}
public static void Main()
{
StartLoadGUIThread();
bool reset = true;
while (true)
{
// Application.Run(new GBEmuWindow());
if (reset)
{
MMU.load("C:\\GBROMS\\hello.gb");
GBEmu.reset();
reset = false;
}
Console.WriteLine("Registers:");
Console.WriteLine("A : " + Z80.Registers.a.ToString("X"));
Console.WriteLine("B : " + Z80.Registers.b.ToString("X"));
Console.WriteLine("C : " + Z80.Registers.c.ToString("X"));
Console.WriteLine("D : " + Z80.Registers.d.ToString("X"));
Console.WriteLine("E : " + Z80.Registers.e.ToString("X"));
Console.WriteLine("H : " + Z80.Registers.h.ToString("X"));
Console.WriteLine("L : " + Z80.Registers.l.ToString("X"));
Console.WriteLine("PC : " + Z80.Registers.pc.ToString("X"));
Console.WriteLine("SP : " + Z80.Registers.sp.ToString("X"));
Console.WriteLine("F (Decimal) : " + Z80.Registers.f.ToString("X"));
Console.WriteLine("Clock m : " + Z80.Clock.m.ToString("X"));
Console.WriteLine("Clock t : " + Z80.Clock.t.ToString("X"));
Console.Write("Press S to step, N to step 100 times, R to reset or X to exit: ");
ConsoleKey key = Console.ReadKey().Key;
Console.WriteLine();
switch (key)
{
case ConsoleKey.S:
Console.WriteLine("Executing command at address: " + Z80.Registers.pc.ToString("X") + "(" + MMU.readByte(Z80.Registers.pc).ToString("X") + ")");
Z80.step();
GPU.step();
break;
case ConsoleKey.J:
Z80.step();
GPU.step();
while (Z80.Registers.pc != 0x100)
{
Z80.step();
GPU.step();
}
break;
case ConsoleKey.N:
for (int i = 0; i < 1000; i++)
{
GBEmu.frame();
}
break;
case ConsoleKey.R:
Z80.reset();
break;
}
}
}