public static void WriteOam(this byte[] data, int destOffset, OamSprite oam)
{
ushort ch1 = (ushort)(
(oam.CoordY & 0xFF) |
(oam.RotScale ? 0x100 : 0) |
(oam.DblSizeDisable ? 0x200 : 0) |
((oam.ObjMode & 3) << 10) |
(oam.ObjMosaic ? 0x1000 : 0) |
(oam.Use8Bpp ? 0x2000 : 0) |
((oam.ObjShape & 3) << 14));
ushort ch2 = (ushort)(
(oam.CoordX & 0x1FF) |
(oam.RotScale ?
((oam.RotScaleParam & 0x1F) << 9) :
(((oam.RotScaleParam & 7) << 9) | (oam.FlipH ? 0x1000 : 0) | (oam.FlipV ? 0x2000 : 0))) |
((oam.ObjSize & 3) << 14));
ushort ch3 = (ushort)(
(oam.Tile & 0x3FF) |
((oam.Priority & 3) << 10) |
((oam.Palette & 0xF) << 12));
data.WriteUShort(destOffset, ch1);
data.WriteUShort(destOffset + 2, ch2);
data.WriteUShort(destOffset + 4, ch3);
}
public static OamSprite ReadOam(this byte[] data, int srcOffset)
{
var ret = new OamSprite();
ushort ch1 = data.ReadUShort(srcOffset);
ushort ch2 = data.ReadUShort(srcOffset + 2);
ushort ch3 = data.ReadUShort(srcOffset + 4);
ret.CoordY = (sbyte)(ch1 & 0xFF);
ret.RotScale = (ch1 & 0x100) != 0;
ret.DblSizeDisable = (ch1 & 0x200) != 0;
ret.ObjMode = (byte)((ch1 >> 10) & 3);
ret.ObjMosaic = (ch1 & 0x1000) != 0;
ret.Use8Bpp = (ch1 & 0x2000) != 0;
ret.ObjShape = (byte)((ch1 >> 14) & 3);
ret.CoordX = (short)(ch2 & 0x1FF);
if ((ret.CoordX & 0x100) != 0)
{
// Sign-extend
ret.CoordX = (short)((ushort)ret.CoordX | 0xFE00);
}
if (ret.RotScale)
{
ret.RotScaleParam = (byte)((ch2 >> 9) & 0x1F);
}
else
{
ret.RotScaleParam = (byte)((ch2 >> 9) & 7);
ret.FlipH = (ch2 & 0x1000) != 0;
ret.FlipV = (ch2 & 0x2000) != 0;
}
ret.ObjSize = (byte)((ch2 >> 14) & 3);
ret.Tile = (ushort)(ch3 & 0x3FF);
ret.Priority = (byte)((ch3 >> 10) & 3);
ret.Palette = (byte)((ch3 >> 12) & 0xF);
return(ret);
}
private void WriteOam(OamSprite oam)
{
Rom.WriteSByte(oam.CoordY);
Rom.WriteSByte((sbyte)oam.CoordX);
ushort ch = (ushort)(
(oam.Tile & 0x3FF) |
(oam.FlipH ? 0x400 : 0) |
(oam.FlipV ? 0x800 : 0) |
((oam.ObjSize & 3) << 12) |
((oam.ObjShape & 3) << 14));
Rom.WriteUShort(ch);
}
public static void Init()
{
for (int i = 0; i < 4; i++)
{
Entries[i] = Rom.ReadInt(Address[i]);
InfoEntries[i] = new SpriteInfo[Entries[i]];
for (int j = 0; j < Entries[i]; j++)
{
int a = GetPointer(i, j);
if (a == -1) continue;
var ie = new SpriteInfo();
ie.bank = i;
ie.index = j;
Rom.Seek(a);
Rom.SeekAdd(8);
ie.SpriteCount = Rom.ReadUShort();
ie.Sprites = new Sprite[ie.SpriteCount];
for (int k = 0; k < ie.SpriteCount; k++)
{
var s = new Sprite();
s.index = k;
s.SpriteCount = Rom.ReadUShort();
s.Sprites = new OamSprite[s.SpriteCount];
for (int m = 0; m < s.SpriteCount; m++)
{
var o = new OamSprite();
o.CoordY = Rom.ReadSByte();
o.CoordX = (short)Rom.ReadSByte();
ushort ch = Rom.ReadUShort();
o.Tile = (ushort)(ch & 0x3FF);
o.FlipH = (ch & 0x400) != 0;
o.FlipV = (ch & 0x800) != 0;
o.ObjSize = (byte)((ch >> 12) & 3);
o.ObjShape = (byte)((ch >> 14) & 3);
s.Sprites[m] = o;
}
Rom.SeekAdd(2);
ie.Sprites[k] = s;
}
InfoEntries[i][j] = ie;
}
}
}
