private NesSprite GetSprite(int bankIndex, int spriteIndex, int paletteIndex = -1, bool bg = false, bool flipVertical = false, bool flipHorizontal = false)
{
if (paletteIndex == -1)
{
paletteIndex = 1;
}
var sprite = new NesSprite();
var paletteBase = (!bg ? PPU.PALETTE_SPRITE : PPU.PALETTE) + paletteIndex * 4;
var addr = spriteIndex * 16 + bankIndex * 0x1000;
var index = 0;
for (int j = 0; j < 8; j++)
{
int value1 = _ppu.ReadPpu(addr);
int value2 = _ppu.ReadPpu(addr + 8);
for (int x = 0; x < 8; x++)
{
var palette = ((value2 & 1) << 1) + (value1 & 1);
sprite.data[index + (7 - x)] = PpuColors.Colors[_ppu.ReadPpu(paletteBase + palette) % 64];
value1 >>= 1;
value2 >>= 1;
}
index += 8;
addr++;
}
return(sprite);
}
private void DrawSprite(NesSprite sprite, int x, int y, int scale = 2)
{
int index = 0;
for (int j = y; j < y + 8; j++)
{
for (int i = x; i < x + 8; i++)
{
DrawPixel(i, j, sprite.data[index++]);
}
}
}
