//////////////////////////////////////////////////////////////////////
//
//////////////////////////////////////////////////////////////////////
private void CreateTilesData(ref sTile[] t, ushort startAdr)
{
//create 1st tile data
t = new sTile[256];
for (int i = 0; i < 256; i++) //a tile is 16 bytes
{
ushort adr = (ushort)(startAdr + (i * 0x10)); //a tile is 16 bytes
t[i].startAdr = adr;
}
}
//////////////////////////////////////////////////////////////////////
//
//////////////////////////////////////////////////////////////////////
private unsafe void DrawTile(sTile t, int posX, int posY, int w, int h, bool hFlip, bool vFlip, ref BitmapData b, ref Color[] palette, bool isAboveBg, int tileLine)
{
int y = posY;
int x = posX;
int stride = b.Stride;
byte * ptr = (byte *)b.Scan0;
int l = tileLine;// % 8;
int maxBitmapIndex = 160 * 3 + 144 * stride;
ushort adr1 = (ushort)(t.startAdr + l * 2);
ushort adr2 = (ushort)(t.startAdr + 1 + l * 2);
if (hFlip)
{
adr2 = (ushort)(t.startAdr + 15 - l * 2);
adr1 = (ushort)(t.startAdr + 15 - 1 - l * 2);
}
byte b1 = GameBoy.Ram.ReadByteAt(adr1); // a line of 8 px is 2 bytes.
byte b2 = GameBoy.Ram.ReadByteAt(adr2); // a line of 8 px is 2 bytes.
Read8PixelsFrom2Byte(b1, b2, ref m_halfLine, ref palette);
for (int m = 0; m < 8; m++)
{
int px = x + m;
if (y >= 0 && y <= h && px <= w && px >= 0)
{
Color c = m_halfLine[m];
if (vFlip)
{
c = m_halfLine[7 - m];
}
if (c != m_bitmapTransparency)
{
if (!isAboveBg)
{
Color bc = Color.FromArgb(255, ptr[(px * 3) + y * stride + 2], ptr[(px * 3) + y * stride + 1], ptr[(px * 3) + y * stride]);
if (bc == m_bgPalette[0])
{
ptr[(px * 3) + y * stride] = c.B;
ptr[(px * 3) + y * stride + 1] = c.G;
ptr[(px * 3) + y * stride + 2] = c.R;
}
}
else
{
ptr[(px * 3) + y * stride] = c.B;
ptr[(px * 3) + y * stride + 1] = c.G;
ptr[(px * 3) + y * stride + 2] = c.R;
}
}
}
}
}
//////////////////////////////////////////////////////////////////////
//
//////////////////////////////////////////////////////////////////////
private void DisplaySprites(ref BitmapData b, int line)
{
byte[] oam = new byte[0xA0];
GameBoy.Ram.ReadAt(0xFE00, 0xA0, ref oam);
bool spriteSize8x16 = m_LCLD_flag_SpriteSize != 0;
for (int i = (0xA0 - 4); i >= 0; i -= 4)
//for (int i = 0; i < 0xA0-4; i++ )
{
int posY = oam[i];
int posX = oam[i + 1];
int idx = oam[i + 2];
int flags = oam[i + 3];
bool isAboveBg = (flags & 0x80) == 0;
bool HFlip = (flags & 0x40) != 0;
bool VFlip = (flags & 0x20) != 0;
bool useOBJ1 = (flags & 0x10) != 0;
Color[] p = m_spPaletteOBJ0;
if (useOBJ1)
{
p = m_spPaletteOBJ1;
}
int l = line % 8;
posX = posX - 8;
posY = posY - 16 + l;
int curSpriteLineMin = posY;
int curSpriteLineMax = posY + 8;
if (spriteSize8x16)
{
curSpriteLineMax += 8;
}
if (curSpriteLineMax >= line && curSpriteLineMin <= line)
{
if (posX != 0 && posY != 0)
{
if (!spriteSize8x16)
{
sTile t = m_tiles_8000_8FFF[idx];
DrawTile(t, posX, posY, 160, 144, HFlip, VFlip, ref b, ref p, isAboveBg, l);
}
else
{
int k0 = idx & 0xFE;
int k1 = idx | 0x01;
if (!HFlip)
{
sTile t = m_tiles_8000_8FFF[k0];
DrawTile(t, posX, posY, 160, 144, HFlip, VFlip, ref b, ref p, isAboveBg, l);
t = m_tiles_8000_8FFF[k1];
DrawTile(t, posX, posY + 8, 160, 144, HFlip, VFlip, ref b, ref p, isAboveBg, l);
}
else
{
sTile t = m_tiles_8000_8FFF[k0];
DrawTile(t, posX, posY + 8, 160, 144, HFlip, VFlip, ref b, ref p, isAboveBg, l);
t = m_tiles_8000_8FFF[k1];
DrawTile(t, posX, posY, 160, 144, HFlip, VFlip, ref b, ref p, isAboveBg, l);
}
}
}
}
}
}
