private void EvaluateSprites()
{
for (int i = 0; i < spritesNumber; ++i)
{
currentScanlineSprites[i].Reset();
}
spritesNumber = 0;
spriteZeroSelected = false;
statusRegister.SpriteOverflow = false;
// decide which sprites are visible on current scanline
for (int i = 0; i < 64; ++i)
{
ObjectAttributeEntry currentSprite = Oam.EntryAt(i);
int diff = scanLine - currentSprite.Y;
if (diff >= 0 && diff < (controlRegister.SpriteSize ? 16 : 8))
{
if (spritesNumber == 8)
{
statusRegister.SpriteOverflow = true;
break;
}
// clone because we are modifying X value in each cycle
currentScanlineSprites[spritesNumber++] = currentSprite.Clone() as ObjectAttributeEntry;
// sprite zero is in current scanline
if (i == 0)
{
spriteZeroSelected = true;
}
}
}
}
private NesSprite GetSprite(Oam oam)
{
bool flipHor = (oam.Attributes & 0b01000000) != 0;
bool flipVer = (oam.Attributes & 0b10000000) != 0;
return(GetSprite(0, oam.Id, oam.Attributes & 3, flipVer, flipHor));
}
public OamViewModel(Oam oam)
{
Oam = oam;
OamResolutions = new Dictionary <string, int>()
{
["8 x 8"] = 0,
["16 x 8"] = 1,
["32 x 8"] = 2,
["8 x 16"] = 3,
["16 x 16"] = 4,
["32 x 16"] = 5,
["8 x 32"] = 6,
["16 x 32"] = 7,
["32 x 32"] = 8,
["64 x 32"] = 9,
["32 x 64"] = 10,
["64 x 64"] = 11
};
X = oam.X;
Y = oam.Y;
Width = oam.Width;
Height = oam.Height;
OBJSize = oam.OBJSize;
TileId = oam.TileId;
Priority = oam.Priority;
PaletteId = oam.PaletteId;
RotateOrScaling = oam.RotateOrScaling;
Mozaic = oam.Mozaic;
HorizontalFlip = oam.HorizontalFlip;
VerticalFlip = oam.VerticalFlip;
}
public static Bitmap MarkSelectOam(Bitmap image, Oam oam)
{
Bitmap copy = image.Clone(new Rectangle(0, 0, image.Width, image.Height), image.PixelFormat);
using (Graphics g = Graphics.FromImage(copy))
{
Rectangle rect = new Rectangle((int)oam.X, (int)oam.Y, (int)oam.Width, (int)oam.Height);
Pen pen = new Pen(Color.Red, 2);
g.DrawRectangle(pen, rect);
}
copy.MakeTransparent();
return(copy);
}
/// <summary>
/// oamメモリへの書き込み
/// </summary>
/// <param name="offset">Offset.</param>
/// <param name="x">The x coordinate.</param>
/// <param name="y">The y coordinate.</param>
/// <param name="tile">Tile.</param>
/// <param name="attr">Attr.</param>
public void WriteOamTable(int offset, int x, int y, int tile, int attr)
{
if (spritePosition[offset] != null)
{
foreach (int position in spritePosition[offset])
{
spriteRenderPosition.Remove(position);
}
spritePosition[offset] = null;
}
bool spriteHit = false;
if (offset == 0)
{
spriteHit = true;
}
int tileID = tile;
int patternTableNumber = SpritePatternTable;
if (SpriteSize > 8)
{
patternTableNumber = Nes.FetchBit(tileID, 0) * 256;
tileID = 2 * (tileID >> 1);
}
bool verticalReverse = Nes.FetchBit(attr, 7) == 1;
bool horizontalReverse = Nes.FetchBit(attr, 6) == 1;
bool priority = Nes.FetchBit(attr, 5) == 0;
int palette = Nes.FetchBit(attr, 1) * 2 + Nes.FetchBit(attr, 0);
oamTable[offset] = new Oam
{
X = x,
Y = y + 1,
TileID = tileID,
PatternTable = patternTableNumber,
HorizontalReverse = horizontalReverse,
VerticalReverse = verticalReverse,
Priority = priority,
Palette = palette,
SpriteHit = spriteHit
};
spritePosition[offset] = new List <int>();
for (int i = x + y * 256, k = 0; i < SpriteSize * 256 + y * 256 + x; i += 256, k++)
{
for (int j = 0; j < 8; j++)
{
if (!spriteRenderPosition.ContainsKey(i + j))
{
spriteRenderPosition.Add(i + j, oamTable[offset]);
}
else
{
spriteRenderPosition[i + j] = oamTable[offset];
}
spritePosition[offset].Add(i + j);
}
if (k == 7)
{
oamTable[offset] = new Oam
{
X = x,
Y = y + 9,
TileID = tileID + 1,
PatternTable = patternTableNumber,
HorizontalReverse = horizontalReverse,
VerticalReverse = verticalReverse,
Priority = priority,
Palette = palette
};
}
}
}
