Apple-2gs-SW/iigs-sprite-compiler
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Fix merge issues and make code more compatible

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This commit is contained in:
Lucas Scharenbroich 2016-11-30 00:08:26 -06:00
parent f1eeadb7f3
commit ff48fefcd4
2 changed files with 23 additions and 1 deletions
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1
SpriteCompiler/Problem/SpriteByte.cs
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@ -19,6 +19,7 @@ namespace SpriteCompiler.Problem
} }
public SpriteByte(byte data, byte mask, ushort offset) public SpriteByte(byte data, byte mask, ushort offset)
: this()
{ {
Data = data; Data = data;
Mask = mask; Mask = mask;

23
SpriteCompiler/Problem/SpriteGeneratorSearchProblem.cs
View File

@ -98,7 +98,10 @@ namespace SpriteCompiler.Problem
{ {
var other = new SpriteGeneratorState(this); var other = new SpriteGeneratorState(this);
f?.Invoke(other); if (f != null)
{
f(other);
}
return other; return other;
} }
@ -193,6 +196,24 @@ namespace SpriteCompiler.Problem
{ {
public IDictionary<CodeSequence, SpriteGeneratorState> Successors(SpriteGeneratorState state) public IDictionary<CodeSequence, SpriteGeneratorState> Successors(SpriteGeneratorState state)
{ {
// This is the work-horse of the compiler. For a given state we need to enumerate all of the
// potential next operations.
//
// 1. If there are 16-bits of data at then current offset, we can
// a. Use one of the cached valued in A/X/Y/D if they match (4 cycles)
// b. Use a PEA to push immediate values (5 cycles)
// c. Load a value into A/X/Y and then push (7 cycles, only feasible if the value appears elsewhere in the sprite)
// d. Load the value into D and then push (9 cycles, and leaves A = D)
//
// 2. Move the stack
// a. Add a value directly (7 cycles, A = unknown)
// b. Skip 1 byte (6 cycles, A = unknown TSC/DEC/TSC)
// c. Multiple skips (LDA X,s/AND/ORA/STA = 16/byte, ADC #/TCS/LDX #/PHX = 10/byte
//
// 3. Single-byte at the end of a solid run
// a. If no registers are 8-bit, LDA #Imm/STA 0,s (8 cycles, sets Acc)
// b. If any reg is already 8-bit, LDA #imm/PHA (6 cycles)
var actions = new List<CodeSequence>(); var actions = new List<CodeSequence>();
// If the accumulator holds an offset then we could move to any byte position. // If the accumulator holds an offset then we could move to any byte position.