private void renderBG(MMU mmu)
{
byte WX = (byte)(mmu.WX - 7); //WX needs -7 Offset
byte WY = mmu.WY;
byte LY = mmu.LY;
byte LCDC = mmu.LCDC;
byte SCY = mmu.SCY;
byte SCX = mmu.SCX;
byte BGP = mmu.BGP;
bool isWin = isWindow(LCDC, WY, LY);
byte y = isWin ? (byte)(LY - WY) : (byte)(LY + SCY);
byte tileLine = (byte)((y & 7) * 2);
ushort tileRow = (ushort)(y / 8 * 32);
ushort tileMap = isWin ? getWindowTileMapAdress(LCDC) : getBGTileMapAdress(LCDC);
byte hi = 0;
byte lo = 0;
for (int p = 0; p < SCREEN_WIDTH; p++)
{
byte x = isWin && p >= WX ? (byte)(p - WX) : (byte)(p + SCX);
if ((p & 0x7) == 0 || ((p + SCX) & 0x7) == 0)
{
ushort tileCol = (ushort)(x / 8);
ushort tileAdress = (ushort)(tileMap + tileRow + tileCol);
ushort tileLoc;
if (isSignedAdress(LCDC))
{
tileLoc = (ushort)(getTileDataAdress(LCDC) + mmu.readVRAM(tileAdress) * 16);
}
else
{
tileLoc = (ushort)(getTileDataAdress(LCDC) + ((sbyte)mmu.readVRAM(tileAdress) + 128) * 16);
}
lo = mmu.readVRAM((ushort)(tileLoc + tileLine));
hi = mmu.readVRAM((ushort)(tileLoc + tileLine + 1));
}
int colorBit = 7 - (x & 7); //inversed
int colorId = GetColorIdBits(colorBit, lo, hi);
int colorIdThroughtPalette = GetColorIdThroughtPalette(BGP, colorId);
bmp.SetPixel(p, LY, color[colorIdThroughtPalette]);
}
}
private void renderSprites(MMU mmu)
{
byte LY = mmu.LY;
byte LCDC = mmu.LCDC;
for (int i = 0x9C; i >= 0; i -= 4)
{ //0x9F OAM Size, 40 Sprites x 4 bytes:
int y = mmu.readOAM(i) - 16; //Byte0 - Y Position //needs 16 offset
int x = mmu.readOAM(i + 1) - 8; //Byte1 - X Position //needs 8 offset
byte tile = mmu.readOAM(i + 2); //Byte2 - Tile/Pattern Number
byte attr = mmu.readOAM(i + 3); //Byte3 - Attributes/Flags
if ((LY >= y) && (LY < (y + spriteSize(LCDC))))
{
byte palette = isBit(4, attr) ? mmu.OBP1 : mmu.OBP0; //Bit4 Palette number **Non CGB Mode Only** (0=OBP0, 1=OBP1)
int tileRow = isYFlipped(attr) ? spriteSize(LCDC) - 1 - (LY - y) : (LY - y);
ushort tileddress = (ushort)(0x8000 + (tile * 16) + (tileRow * 2));
byte lo = mmu.readVRAM(tileddress);
byte hi = mmu.readVRAM((ushort)(tileddress + 1));
for (int p = 0; p < 8; p++)
{
int IdPos = isXFlipped(attr) ? p : 7 - p;
int colorId = GetColorIdBits(IdPos, lo, hi);
int colorIdThroughtPalette = GetColorIdThroughtPalette(palette, colorId);
if ((x + p) >= 0 && (x + p) < SCREEN_WIDTH)
{
if (!isTransparent(colorId) && (isAboveBG(attr) || isBGWhite(mmu.BGP, x + p, LY)))
{
bmp.SetPixel(x + p, LY, color[colorIdThroughtPalette]);
}
}
}
}
}
}