feat(core): add font set, quirks config, and save-state snapshot
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@@ -0,0 +1,48 @@
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namespace Chip8.Core;
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internal static class FontSet
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{
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public const int glyphBytes = 5;
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public const int bigGlyphBytes = 10;
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public static readonly byte[] glyphs =
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{
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0xF0, 0x90, 0x90, 0x90, 0xF0, // 0
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0x20, 0x60, 0x20, 0x20, 0x70, // 1
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0xF0, 0x10, 0xF0, 0x80, 0xF0, // 2
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0xF0, 0x10, 0xF0, 0x10, 0xF0, // 3
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0x90, 0x90, 0xF0, 0x10, 0x10, // 4
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0xF0, 0x80, 0xF0, 0x10, 0xF0, // 5
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0xF0, 0x80, 0xF0, 0x90, 0xF0, // 6
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0xF0, 0x10, 0x20, 0x40, 0x40, // 7
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0xF0, 0x90, 0xF0, 0x90, 0xF0, // 8
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0xF0, 0x90, 0xF0, 0x10, 0xF0, // 9
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0xF0, 0x90, 0xF0, 0x90, 0x90, // A
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0xE0, 0x90, 0xE0, 0x90, 0xE0, // B
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0xF0, 0x80, 0x80, 0x80, 0xF0, // C
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0xE0, 0x90, 0x90, 0x90, 0xE0, // D
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0xF0, 0x80, 0xF0, 0x80, 0xF0, // E
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0xF0, 0x80, 0xF0, 0x80, 0x80, // F
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};
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public static readonly byte[] bigGlyphs =
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{
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0x3C, 0x7E, 0xE7, 0xC3, 0xC3, 0xC3, 0xC3, 0xE7, 0x7E, 0x3C, // 0
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0x18, 0x38, 0x58, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x3C, // 1
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0x3E, 0x7F, 0xC3, 0x06, 0x0C, 0x18, 0x30, 0x60, 0xFF, 0xFF, // 2
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0x3C, 0x7E, 0xC3, 0x03, 0x0E, 0x0E, 0x03, 0xC3, 0x7E, 0x3C, // 3
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0x06, 0x0E, 0x1E, 0x36, 0x66, 0xC6, 0xFF, 0xFF, 0x06, 0x06, // 4
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0xFF, 0xFF, 0xC0, 0xC0, 0xFC, 0xFE, 0x03, 0xC3, 0x7E, 0x3C, // 5
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0x3E, 0x7C, 0xE0, 0xC0, 0xFC, 0xFE, 0xC3, 0xC3, 0x7E, 0x3C, // 6
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0xFF, 0xFF, 0x03, 0x06, 0x0C, 0x18, 0x30, 0x60, 0x60, 0x60, // 7
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0x3C, 0x7E, 0xC3, 0xC3, 0x7E, 0x7E, 0xC3, 0xC3, 0x7E, 0x3C, // 8
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0x3C, 0x7E, 0xC3, 0xC3, 0x7F, 0x3F, 0x03, 0x07, 0x7E, 0x7C, // 9
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0x18, 0x3C, 0x66, 0xC3, 0xC3, 0xFF, 0xFF, 0xC3, 0xC3, 0xC3, // A
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0xFC, 0xFE, 0xC3, 0xC3, 0xFE, 0xFE, 0xC3, 0xC3, 0xFE, 0xFC, // B
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0x3C, 0x7E, 0xC3, 0xC0, 0xC0, 0xC0, 0xC0, 0xC3, 0x7E, 0x3C, // C
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0xFC, 0xFE, 0xC3, 0xC3, 0xC3, 0xC3, 0xC3, 0xC3, 0xFE, 0xFC, // D
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0xFF, 0xFF, 0xC0, 0xC0, 0xFC, 0xFC, 0xC0, 0xC0, 0xFF, 0xFF, // E
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0xFF, 0xFF, 0xC0, 0xC0, 0xFC, 0xFC, 0xC0, 0xC0, 0xC0, 0xC0, // F
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};
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}
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@@ -0,0 +1,71 @@
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using System;
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using System.Globalization;
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using System.Text;
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namespace Chip8.Core;
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public sealed class MachineSnapshot
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{
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public ushort pc { get; init; }
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public ushort i { get; init; }
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public byte sp { get; init; }
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public byte delayTimer { get; init; }
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public byte soundTimer { get; init; }
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public int planeMask { get; init; }
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public bool hires { get; init; }
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public bool exited { get; init; }
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public byte[] v { get; init; } = Array.Empty<byte>();
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public ushort[] stack { get; init; } = Array.Empty<ushort>();
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public static MachineSnapshot capture(Machine machine)
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{
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var stackFrames = new ushort[machine.sp];
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Array.Copy(machine.stack, stackFrames, machine.sp);
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return new MachineSnapshot
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{
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pc = machine.pc,
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i = machine.i,
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sp = machine.sp,
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delayTimer = machine.delayTimer,
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soundTimer = machine.soundTimer,
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planeMask = machine.planeMask,
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hires = machine.hires,
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exited = machine.exited,
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v = (byte[])machine.v.Clone(),
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stack = stackFrames,
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};
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}
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public string format()
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{
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var builder = new StringBuilder();
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builder.Append("PC=0x").Append(pc.ToString("X4", CultureInfo.InvariantCulture));
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builder.Append(" I=0x").Append(i.ToString("X4", CultureInfo.InvariantCulture));
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builder.Append(" SP=").Append(sp);
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builder.Append(" DT=").Append(delayTimer);
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builder.Append(" ST=").Append(soundTimer);
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builder.Append(" plane=").Append(planeMask);
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builder.Append(" hires=").Append(hires ? "1" : "0");
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builder.Append('\n');
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for (int register = 0; register < v.Length; register++)
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{
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builder.Append('V').Append(register.ToString("X1", CultureInfo.InvariantCulture));
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builder.Append('=').Append(v[register].ToString("X2", CultureInfo.InvariantCulture));
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builder.Append((register & 0x7) == 0x7 ? '\n' : ' ');
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}
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builder.Append("stack=[");
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for (int frame = 0; frame < stack.Length; frame++)
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{
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if (frame > 0)
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{
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builder.Append(' ');
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}
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builder.Append("0x").Append(stack[frame].ToString("X4", CultureInfo.InvariantCulture));
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}
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builder.Append("]\n");
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return builder.ToString();
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}
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}
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@@ -0,0 +1,56 @@
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namespace Chip8.Core;
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public sealed class Quirks
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{
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public bool shiftUsesVy { get; set; }
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public bool jumpWithVx { get; set; }
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public bool loadStoreIncrementsI { get; set; }
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public bool resetVfOnLogic { get; set; }
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public bool clipSprites { get; set; }
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public bool addToIndexSetsCarry { get; set; }
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public static Quirks cosmacVip() => new()
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{
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shiftUsesVy = true,
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jumpWithVx = false,
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loadStoreIncrementsI = true,
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resetVfOnLogic = true,
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clipSprites = true,
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addToIndexSetsCarry = false,
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};
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public static Quirks modern() => new()
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{
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shiftUsesVy = false,
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jumpWithVx = false,
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loadStoreIncrementsI = false,
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resetVfOnLogic = false,
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clipSprites = true,
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addToIndexSetsCarry = false,
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};
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public static Quirks superChip() => new()
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{
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shiftUsesVy = false,
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jumpWithVx = true,
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loadStoreIncrementsI = false,
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resetVfOnLogic = false,
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clipSprites = true,
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addToIndexSetsCarry = false,
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};
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public static Quirks xoChip() => new()
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{
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shiftUsesVy = false,
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jumpWithVx = false,
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loadStoreIncrementsI = false,
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resetVfOnLogic = false,
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clipSprites = false,
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addToIndexSetsCarry = false,
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};
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}
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