public override SpriteGeneratorState Apply(SpriteGeneratorState state)
{
return(state.Clone(_ =>
{
_.A = _.S;
}));
}
public override SpriteGeneratorState Apply(SpriteGeneratorState state)
{
return(state.Clone(_ =>
{
_.RemoveWord((ushort)(offset + _.S.Value));
}));
}
public override SpriteGeneratorState Apply(SpriteGeneratorState state)
{
return(state.Clone(_ =>
{
_.RemoveByte((ushort)(_.S.Value));
_.S = _.S.Add(-1);
}));
}
public override SpriteGeneratorState Apply(SpriteGeneratorState state)
{
return(state.Clone(_ =>
{
_.A = _.A.LoadConstant((_.A.Value & 0xFF00) | value);
_.RemoveByte((ushort)(offset + _.S.Value));
}));
}
public override SpriteGeneratorState Apply(SpriteGeneratorState state)
{
return(state.Clone(_ =>
{
_.A = Register.UNINITIALIZED;
_.RemoveByte((ushort)(offset + _.S.Value));
}));
}
public override SpriteGeneratorState Apply(SpriteGeneratorState state)
{
return(state.Clone(_ =>
{
_.P |= 0x10;
_.AllowModeChange = false;
}));
}
public override SpriteGeneratorState Apply(SpriteGeneratorState state)
{
return(state.Clone(_ =>
{
_.A = _.A.Add(offset);
_.S = _.A;
_.AllowModeChange = true;
}));
}
public override SpriteGeneratorState Apply(SpriteGeneratorState state)
{
return(state.Clone(_ =>
{
_.A = _.A.LoadConstant(value); // Need to be able to track high / low bytes independently...
_.RemoveByte((ushort)(_.S.Value));
_.S = _.S.Add(-1);
}));
}
public override SpriteGeneratorState Apply(SpriteGeneratorState state)
{
return(state.Clone(_ =>
{
_.A = _.A.LoadConstant(value);
_.RemoveWord((ushort)(_.S.Value - 1));
_.S = _.S.Add(-2);
}));
}
public static SpriteByte?TryGetStackByte(this SpriteGeneratorState state, IDictionary <ushort, SpriteByte> data)
{
SpriteByte top;
if (state.S.IsScreenOffset && data.TryGetValue((ushort)state.S.Value, out top))
{
return(top);
}
return(null);
}
public static SpriteWord?TryGetStackWord(this SpriteGeneratorState state, IDictionary <ushort, SpriteByte> data, int offset)
{
// When we get a word, it's permissible for either the high or low byte to not exist, but not both
SpriteByte high;
SpriteByte low;
// Make sure the range is within bounds
if (state.S.IsScreenOffset && (state.S.Value + offset) > 0)
{
// Try to get the high byte
byte high_data = 0x00;
byte high_mask = 0xFF;
ushort high_offset = (ushort)(state.S.Value + offset);
if (data.TryGetValue(high_offset, out high))
{
high_data = high.Data;
high_mask = high.Mask;
}
// Try to get the low byte
byte low_data = 0x00;
byte low_mask = 0xFF;
ushort low_offset = (ushort)(state.S.Value + offset - 1);
if (data.TryGetValue(low_offset, out low))
{
low_data = low.Data;
low_mask = low.Mask;
}
// At least some data need to be visible
if (high_mask != 0xFF || low_mask != 0xFF)
{
var word_data = (ushort)(low_data + (high_data << 8));
var word_mask = (ushort)(low_mask + (high_mask << 8));
return(new SpriteWord(word_data, word_mask, low_offset));
}
}
return(null);
}
// Function to generate a new state based on the code's operation public abstract SpriteGeneratorState Apply(SpriteGeneratorState state);
public static SpriteWord?TryGetStackWord(this SpriteGeneratorState state, IDictionary <ushort, SpriteByte> data)
{
return(TryGetStackWord(state, data, 0));
}
public static Tuple <CodeSequence, SpriteGeneratorState> Apply(this SpriteGeneratorState state, CodeSequence code)
{
return(Tuple.Create(code, code.Apply(state)));
}