public BackgroundHandler(
IPPUMemoryMap ppuMemoryMap,
PPURegisters registers,
PPUInternalRegisters internalRegisters,
ScrollHandler scrollHandler,
PaletteHandler paletteHandler)
{
this.registers = registers;
this.ppuMemoryMap = ppuMemoryMap;
this.scrollHandler = scrollHandler;
this.paletteHandler = paletteHandler;
this.internalRegisters = internalRegisters;
foreach (var patternTable in this.ppuMemoryMap.GetMemorySegments <PatternTable>())
{
if (patternTable.Range.Min == 0x0000)
{
this.patternTable0 = patternTable;
}
else if (patternTable.Range.Min == 0x1000)
{
this.patternTable1 = patternTable;
}
}
foreach (var nameTable in this.ppuMemoryMap.GetMemorySegments <Nametable>())
{
if (nameTable.Range.Min == 0x2000)
{
this.nameTable0 = nameTable;
}
else if (nameTable.Range.Min == 0x2400)
{
this.nameTable1 = nameTable;
}
else if (nameTable.Range.Min == 0x2800)
{
this.nameTable2 = nameTable;
}
else if (nameTable.Range.Min == 0x2C00)
{
this.nameTable3 = nameTable;
}
}
}
public static Tile GetTileFromPixel(int x, int y, ScrollHandler scrollHandler, Tile workingTile, int bgOffset, PPUInternalRegisters registers)
{
var scrolledX = scrollHandler.vCoarseXScroll - 1;
var scrolledY = scrollHandler.vCoarseYScroll;
var tile = workingTile;
tile.PPUAddress = (ushort)(0x2000 + x + (y * Constants.NumberOfColumns));
tile.Location = (x, y);
var colorIndex = GetColorIndex(tile, scrollHandler);
byte paletteId = 0;
if (colorIndex != 0)
{
paletteId = (byte)((tile.AttributeData >> 0) & 3);
}
tile.PaletteAddress = (ushort)(0x3f00 + 4 * paletteId + colorIndex);
return(tile);
}
public ScrollHandler(PPURegisters registers, PPUInternalRegisters internalRegisters)
{
this.registers = registers;
this.internalRegisters = internalRegisters;
}
