public void CanSetSpriteAtByteBorderBit()
{
var sprite = new byte[5];
sprite[0] = 0xff;
var display = new TestDisplay();
var cpu = new CPU(new Memory(), display, null);
cpu.SetSprite(8, 0, sprite, 1);
// 0 1 2 3
// 0000000011111110000000000000000
// 0x0 0xff 0x0 0x0
Assert.AreEqual(0xff, display.Screen[1]);
}
public void CanSetSprite1()
{
var sprite = new byte[5];
sprite[0] = 0x20;
sprite[1] = 0x60;
sprite[2] = 0x20;
sprite[3] = 0x20;
sprite[4] = 0x70;
var display = new TestDisplay();
var cpu = new CPU(new Memory(), display, null);
cpu.SetSprite(4, 4, sprite, 5);
display.Print();
}
public void CanSetSpriteAtOddBit()
{
var sprite = new byte[5];
sprite[0] = 0xff;
var display = new TestDisplay();
var cpu = new CPU(new Memory(), display, null);
cpu.SetSprite(10, 0, sprite, 1);
display.Print();
// 0 1 2 3
// 0000000000111111100000000000000
// 0000000011111110000000011000000 msb -> lsb
// 0x0 0x3f 0xc0 0x0
Assert.AreEqual(0xfc, display.Screen[1]);
Assert.AreEqual(0x03, display.Screen[2]);
}
public void CanWrapSpriteAtY()
{
var sprite = new byte[5];
sprite[0] = 0xff;
sprite[1] = 0xff;
var display = new TestDisplay();
var cpu = new CPU(new Memory(), display, null);
cpu.SetSprite(0, 31, sprite, 2);
Assert.AreEqual(0xff, display.Screen[31*8]);
Assert.AreEqual(0xff, display.Screen[0]);
}
public void CanWrapSpriteAtX()
{
var sprite = new byte[5];
sprite[0] = 0xff;
var display = new TestDisplay();
var cpu = new CPU(new Memory(), display, null);
cpu.SetSprite(62, 0, sprite, 1);
// 62 63 |64 65
// 11111100 00000000 |00000000 00000011
// 00111111 00000000 |00000000 11000000 lsb
// 0xfc 0x0 0x0 0x3
display.Print();
Assert.AreEqual(0xc0, display.Screen[7]);
Assert.AreEqual(0x3f, display.Screen[0]);
}