private unsafe void DrawATile(int tileNumber, ref BitmapData b, int bitmapXPos, int bitmapYPos)
{
int stride = b.Stride;
byte * ptr = (byte *)b.Scan0;
int tileAdr = 0x8000 + tileNumber * 0x10;
int y = bitmapXPos;
int x = bitmapYPos;
ushort adr1 = 0;
ushort adr2 = 0;
Color[] halfLine = new Color[8];
for (int j = 0; j < 16; j += 2)
{
adr1 = (ushort)(tileAdr + j);
adr2 = (ushort)(tileAdr + j + 1);
byte b1 = m_ram.ReadByteAt(adr1); // a line of 8 px is 2 bytes.
byte b2 = m_ram.ReadByteAt(adr2); // a line of 8 px is 2 bytes.
Read8PixelsFrom2Byte(b1, b2, ref halfLine, ref m_bgPalette);
for (int m = 0; m < 8; m++)
{
int px = x + m;
//if (y >= 0 && y <= h && px <= w && px >= 0)
{
Color c = halfLine[m];
ptr[(px * 3) + y * stride] = c.B;
ptr[(px * 3) + y * stride + 1] = c.G;
ptr[(px * 3) + y * stride + 2] = c.R;
}
}
y++;
}
}
//////////////////////////////////////////////////////////////////////
//
//////////////////////////////////////////////////////////////////////
private void DrawTiles(Graphics g)
{
if (m_ram == null)
{
return;
}
int nbTiles = 256;// 32 * 16;// 32 * 32;
int x;
int y;
sTile tile;
Color[] halfLine = new Color[8];
ColorConverter cv = new ColorConverter();
Pen p = new Pen(Color.Black);
for (int i = 0; i < nbTiles; i++)
{
tile = m_tiles[i];
y = (i / 16) * 8;
x = (i % 16) * 8;
ushort adr1 = 0;
ushort adr2 = 0;
for (int j = 0; j < 16; j += 2)
{
adr1 = (ushort)(tile.startAdr + j);
adr2 = (ushort)(tile.startAdr + j + 1);
byte b1 = m_ram.ReadByteAt(adr1); // a line of 8 px is 2 bytes.
byte b2 = m_ram.ReadByteAt(adr2); // a line of 8 px is 2 bytes.
Read8PixelsFrom2Byte(b1, b2, ref halfLine);
for (int k = 0; k < 8; k++)
{
//m_bitmap.SetPixel(x + k, y, halfLine[k ]);
p.Color = halfLine[k];
g.DrawRectangle(p, x + k, y, 1, 1);
}
y++;
}
}
}
public void UpdateForm()
{
for (ushort i = m_OAMStartAdr; i < m_OAMEndAdr; i += 4)
{
UpdateSprite(i);
}
// update bg tiles
for (int i = 0; i < 32; i++)
{
for (int j = 0; j < 32; j++)
{
ushort adr = (ushort)(m_BGTilesStartAdr + i + j * 32);
int tileNumber = m_ram.ReadByteAt(adr);
// todo : tile start adr switch
ushort tileAdr = (ushort)(0x8000 + tileNumber * 16);
UpdateBackgroundTile(tileAdr, i, j);
}
}
}