├── .gitattributes ├── .gitignore ├── Chip8.sln └── Chip8 ├── Audio.cs ├── Chip8.csproj ├── Cpu.cs ├── Display.cs ├── Machine.cs ├── Memory.cs └── Program.cs /.gitattributes: -------------------------------------------------------------------------------- 1 | ############################################################################### 2 | # Set default behavior to automatically normalize line endings. 3 | ############################################################################### 4 | * text=auto 5 | 6 | ############################################################################### 7 | # Set default behavior for command prompt diff. 8 | # 9 | # This is need for earlier builds of msysgit that does not have it on by 10 | # default for csharp files. 11 | # Note: This is only used by command line 12 | ############################################################################### 13 | #*.cs diff=csharp 14 | 15 | ############################################################################### 16 | # Set the merge driver for project and solution files 17 | # 18 | # Merging from the command prompt will add diff markers to the files if there 19 | # are conflicts (Merging from VS is not affected by the settings below, in VS 20 | # the diff markers are never inserted). Diff markers may cause the following 21 | # file extensions to fail to load in VS. An alternative would be to treat 22 | # these files as binary and thus will always conflict and require user 23 | # intervention with every merge. To do so, just uncomment the entries below 24 | ############################################################################### 25 | #*.sln merge=binary 26 | #*.csproj merge=binary 27 | #*.vbproj merge=binary 28 | #*.vcxproj merge=binary 29 | #*.vcproj merge=binary 30 | #*.dbproj merge=binary 31 | #*.fsproj merge=binary 32 | #*.lsproj merge=binary 33 | #*.wixproj merge=binary 34 | #*.modelproj merge=binary 35 | #*.sqlproj merge=binary 36 | #*.wwaproj merge=binary 37 | 38 | ############################################################################### 39 | # behavior for image files 40 | # 41 | # image files are treated as binary by default. 42 | ############################################################################### 43 | #*.jpg binary 44 | #*.png binary 45 | #*.gif binary 46 | 47 | ############################################################################### 48 | # diff behavior for common document formats 49 | # 50 | # Convert binary document formats to text before diffing them. This feature 51 | # is only available from the command line. Turn it on by uncommenting the 52 | # entries below. 53 | ############################################################################### 54 | #*.doc diff=astextplain 55 | #*.DOC diff=astextplain 56 | #*.docx diff=astextplain 57 | #*.DOCX diff=astextplain 58 | #*.dot diff=astextplain 59 | #*.DOT diff=astextplain 60 | #*.pdf diff=astextplain 61 | #*.PDF diff=astextplain 62 | #*.rtf diff=astextplain 63 | #*.RTF diff=astextplain 64 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | ## Ignore Visual Studio temporary files, build results, and 2 | ## files generated by popular Visual Studio add-ons. 3 | 4 | # User-specific files 5 | *.suo 6 | *.user 7 | *.userosscache 8 | *.sln.docstates 9 | 10 | # User-specific files (MonoDevelop/Xamarin Studio) 11 | *.userprefs 12 | 13 | # Build results 14 | [Dd]ebug/ 15 | [Dd]ebugPublic/ 16 | [Rr]elease/ 17 | [Rr]eleases/ 18 | x64/ 19 | x86/ 20 | bld/ 21 | [Bb]in/ 22 | [Oo]bj/ 23 | [Ll]og/ 24 | 25 | # Visual Studio 2015 cache/options directory 26 | .vs/ 27 | # Uncomment if you have tasks that create the project's static files in wwwroot 28 | #wwwroot/ 29 | 30 | # MSTest test Results 31 | [Tt]est[Rr]esult*/ 32 | [Bb]uild[Ll]og.* 33 | 34 | # NUNIT 35 | *.VisualState.xml 36 | TestResult.xml 37 | 38 | # Build Results of an ATL Project 39 | [Dd]ebugPS/ 40 | [Rr]eleasePS/ 41 | dlldata.c 42 | 43 | # DNX 44 | project.lock.json 45 | project.fragment.lock.json 46 | artifacts/ 47 | 48 | *_i.c 49 | *_p.c 50 | *_i.h 51 | *.ilk 52 | *.meta 53 | *.obj 54 | *.pch 55 | *.pdb 56 | *.pgc 57 | *.pgd 58 | *.rsp 59 | *.sbr 60 | *.tlb 61 | *.tli 62 | *.tlh 63 | *.tmp 64 | *.tmp_proj 65 | *.log 66 | *.vspscc 67 | *.vssscc 68 | .builds 69 | *.pidb 70 | *.svclog 71 | *.scc 72 | 73 | # Chutzpah Test files 74 | _Chutzpah* 75 | 76 | # Visual C++ cache files 77 | ipch/ 78 | *.aps 79 | *.ncb 80 | *.opendb 81 | *.opensdf 82 | *.sdf 83 | *.cachefile 84 | *.VC.db 85 | *.VC.VC.opendb 86 | 87 | # Visual Studio profiler 88 | *.psess 89 | *.vsp 90 | *.vspx 91 | *.sap 92 | 93 | # TFS 2012 Local Workspace 94 | $tf/ 95 | 96 | # Guidance Automation Toolkit 97 | *.gpState 98 | 99 | # ReSharper is a .NET coding add-in 100 | _ReSharper*/ 101 | *.[Rr]e[Ss]harper 102 | *.DotSettings.user 103 | 104 | # JustCode is a .NET coding add-in 105 | .JustCode 106 | 107 | # TeamCity is a build add-in 108 | _TeamCity* 109 | 110 | # DotCover is a Code Coverage Tool 111 | *.dotCover 112 | 113 | # NCrunch 114 | _NCrunch_* 115 | .*crunch*.local.xml 116 | nCrunchTemp_* 117 | 118 | # MightyMoose 119 | *.mm.* 120 | AutoTest.Net/ 121 | 122 | # Web workbench (sass) 123 | .sass-cache/ 124 | 125 | # Installshield output folder 126 | [Ee]xpress/ 127 | 128 | # DocProject is a documentation generator add-in 129 | DocProject/buildhelp/ 130 | DocProject/Help/*.HxT 131 | DocProject/Help/*.HxC 132 | DocProject/Help/*.hhc 133 | DocProject/Help/*.hhk 134 | DocProject/Help/*.hhp 135 | DocProject/Help/Html2 136 | DocProject/Help/html 137 | 138 | # Click-Once directory 139 | publish/ 140 | 141 | # Publish Web Output 142 | *.[Pp]ublish.xml 143 | *.azurePubxml 144 | # TODO: Comment the next line if you want to checkin your web deploy settings 145 | # but database connection strings (with potential passwords) will be unencrypted 146 | #*.pubxml 147 | *.publishproj 148 | 149 | # Microsoft Azure Web App publish settings. Comment the next line if you want to 150 | # checkin your Azure Web App publish settings, but sensitive information contained 151 | # in these scripts will be unencrypted 152 | PublishScripts/ 153 | 154 | # NuGet Packages 155 | *.nupkg 156 | # The packages folder can be ignored because of Package Restore 157 | **/packages/* 158 | # except build/, which is used as an MSBuild target. 159 | !**/packages/build/ 160 | # Uncomment if necessary however generally it will be regenerated when needed 161 | #!**/packages/repositories.config 162 | # NuGet v3's project.json files produces more ignoreable files 163 | *.nuget.props 164 | *.nuget.targets 165 | 166 | # Microsoft Azure Build Output 167 | csx/ 168 | *.build.csdef 169 | 170 | # Microsoft Azure Emulator 171 | ecf/ 172 | rcf/ 173 | 174 | # Windows Store app package directories and files 175 | AppPackages/ 176 | BundleArtifacts/ 177 | Package.StoreAssociation.xml 178 | _pkginfo.txt 179 | 180 | # Visual Studio cache files 181 | # files ending in .cache can be ignored 182 | *.[Cc]ache 183 | # but keep track of directories ending in .cache 184 | !*.[Cc]ache/ 185 | 186 | # Others 187 | ClientBin/ 188 | ~$* 189 | *~ 190 | *.dbmdl 191 | *.dbproj.schemaview 192 | *.jfm 193 | *.pfx 194 | *.publishsettings 195 | node_modules/ 196 | orleans.codegen.cs 197 | 198 | # Since there are multiple workflows, uncomment next line to ignore bower_components 199 | # (https://github.com/github/gitignore/pull/1529#issuecomment-104372622) 200 | #bower_components/ 201 | 202 | # RIA/Silverlight projects 203 | Generated_Code/ 204 | 205 | # Backup & report files from converting an old project file 206 | # to a newer Visual Studio version. Backup files are not needed, 207 | # because we have git ;-) 208 | _UpgradeReport_Files/ 209 | Backup*/ 210 | UpgradeLog*.XML 211 | UpgradeLog*.htm 212 | 213 | # SQL Server files 214 | *.mdf 215 | *.ldf 216 | 217 | # Business Intelligence projects 218 | *.rdl.data 219 | *.bim.layout 220 | *.bim_*.settings 221 | 222 | # Microsoft Fakes 223 | FakesAssemblies/ 224 | 225 | # GhostDoc plugin setting file 226 | *.GhostDoc.xml 227 | 228 | # Node.js Tools for Visual Studio 229 | .ntvs_analysis.dat 230 | 231 | # Visual Studio 6 build log 232 | *.plg 233 | 234 | # Visual Studio 6 workspace options file 235 | *.opt 236 | 237 | # Visual Studio LightSwitch build output 238 | **/*.HTMLClient/GeneratedArtifacts 239 | **/*.DesktopClient/GeneratedArtifacts 240 | **/*.DesktopClient/ModelManifest.xml 241 | **/*.Server/GeneratedArtifacts 242 | **/*.Server/ModelManifest.xml 243 | _Pvt_Extensions 244 | 245 | # Paket dependency manager 246 | .paket/paket.exe 247 | paket-files/ 248 | 249 | # FAKE - F# Make 250 | .fake/ 251 | 252 | # JetBrains Rider 253 | .idea/ 254 | *.sln.iml 255 | 256 | # CodeRush 257 | .cr/ 258 | 259 | # Python Tools for Visual Studio (PTVS) 260 | __pycache__/ 261 | *.pyc 262 | /Chip8/Settings.StyleCop 263 | /Chip8/IBM.ch8 264 | /Chip8/SI.ch8 265 | /Chip8/test_opcode.ch8 266 | -------------------------------------------------------------------------------- /Chip8.sln: -------------------------------------------------------------------------------- 1 |  2 | Microsoft Visual Studio Solution File, Format Version 12.00 3 | # Visual Studio Version 16 4 | VisualStudioVersion = 16.0.30330.147 5 | MinimumVisualStudioVersion = 10.0.40219.1 6 | Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Chip8", "Chip8\Chip8.csproj", "{81C54BBE-54A7-4973-A13D-4ADE54D0AD78}" 7 | EndProject 8 | Global 9 | GlobalSection(SolutionConfigurationPlatforms) = preSolution 10 | Debug|Any CPU = Debug|Any CPU 11 | Debug|x64 = Debug|x64 12 | Debug|x86 = Debug|x86 13 | Release|Any CPU = Release|Any CPU 14 | Release|x64 = Release|x64 15 | Release|x86 = Release|x86 16 | EndGlobalSection 17 | GlobalSection(ProjectConfigurationPlatforms) = postSolution 18 | {81C54BBE-54A7-4973-A13D-4ADE54D0AD78}.Debug|Any CPU.ActiveCfg = Debug|Any CPU 19 | {81C54BBE-54A7-4973-A13D-4ADE54D0AD78}.Debug|Any CPU.Build.0 = Debug|Any CPU 20 | {81C54BBE-54A7-4973-A13D-4ADE54D0AD78}.Debug|x64.ActiveCfg = Debug|Any CPU 21 | {81C54BBE-54A7-4973-A13D-4ADE54D0AD78}.Debug|x64.Build.0 = Debug|Any CPU 22 | {81C54BBE-54A7-4973-A13D-4ADE54D0AD78}.Debug|x86.ActiveCfg = Debug|Any CPU 23 | {81C54BBE-54A7-4973-A13D-4ADE54D0AD78}.Debug|x86.Build.0 = Debug|Any CPU 24 | {81C54BBE-54A7-4973-A13D-4ADE54D0AD78}.Release|Any CPU.ActiveCfg = Release|Any CPU 25 | {81C54BBE-54A7-4973-A13D-4ADE54D0AD78}.Release|Any CPU.Build.0 = Release|Any CPU 26 | {81C54BBE-54A7-4973-A13D-4ADE54D0AD78}.Release|x64.ActiveCfg = Release|Any CPU 27 | {81C54BBE-54A7-4973-A13D-4ADE54D0AD78}.Release|x64.Build.0 = Release|Any CPU 28 | {81C54BBE-54A7-4973-A13D-4ADE54D0AD78}.Release|x86.ActiveCfg = Release|Any CPU 29 | {81C54BBE-54A7-4973-A13D-4ADE54D0AD78}.Release|x86.Build.0 = Release|Any CPU 30 | EndGlobalSection 31 | GlobalSection(SolutionProperties) = preSolution 32 | HideSolutionNode = FALSE 33 | EndGlobalSection 34 | GlobalSection(ExtensibilityGlobals) = postSolution 35 | SolutionGuid = {0FE85290-95ED-42DE-A73E-71F4F1C8384B} 36 | EndGlobalSection 37 | EndGlobal 38 | -------------------------------------------------------------------------------- /Chip8/Audio.cs: -------------------------------------------------------------------------------- 1 | using SFML.Audio; 2 | 3 | namespace Chip8; 4 | 5 | public class Audio 6 | { 7 | private readonly short[] raw; 8 | private readonly SoundBuffer buffer; 9 | private readonly Sound sound; 10 | 11 | public Audio() 12 | { 13 | raw = new short[44100]; 14 | 15 | // Generate square wave for beep 16 | for (uint i = 0; i < 44100; i++) 17 | { 18 | raw[i] = (short)((i / (44100 / 512) / 2 % 2) == 0 ? -10000 : 10000); 19 | } 20 | 21 | buffer = new SoundBuffer(raw, 1, 44100); 22 | sound = new Sound(buffer); 23 | } 24 | 25 | public void Play() 26 | { 27 | sound.Play(); 28 | } 29 | 30 | public void Stop() 31 | { 32 | sound.Stop(); 33 | } 34 | } -------------------------------------------------------------------------------- /Chip8/Chip8.csproj: -------------------------------------------------------------------------------- 1 |  2 | 3 | 4 | Exe 5 | net8.0 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | PreserveNewest 15 | 16 | 17 | PreserveNewest 18 | 19 | 20 | 21 | 22 | -------------------------------------------------------------------------------- /Chip8/Cpu.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | using System.Collections.Generic; 3 | using System.Timers; 4 | 5 | namespace Chip8; 6 | 7 | public class Cpu 8 | { 9 | private readonly Memory ram; 10 | private readonly Stack stack; 11 | private readonly Display display; 12 | private readonly Audio beep; 13 | private readonly Random rnd; 14 | private readonly Timer delayTimer; 15 | private readonly bool[] keysPressed; 16 | 17 | // Registers 18 | private readonly byte[] v; // registers V0 to V15 19 | private byte dt; // Delay timer 20 | private byte st; // Sound Timer 21 | private ushort i; // Address register 22 | private ushort pc; // Program Counter 23 | 24 | private bool halted; 25 | 26 | public bool CanDrawSprite; 27 | 28 | public Cpu(Display display, Memory ram, Audio audio, bool[] keysPressed) 29 | { 30 | v = new byte[16]; 31 | stack = new Stack(); 32 | pc = 0x200; 33 | dt = 0; 34 | st = 0; 35 | 36 | this.display = display; 37 | this.ram = ram; 38 | this.keysPressed = keysPressed; 39 | beep = audio; 40 | 41 | delayTimer = new Timer(16.67); 42 | delayTimer.Elapsed += (s, e) => 43 | { 44 | if (dt > 0) 45 | { 46 | dt--; 47 | } 48 | 49 | if (st > 0) 50 | { 51 | beep.Play(); 52 | st--; 53 | } 54 | else 55 | { 56 | beep.Stop(); 57 | } 58 | }; 59 | delayTimer.AutoReset = true; 60 | delayTimer.Enabled = true; 61 | 62 | rnd = new Random(); 63 | } 64 | 65 | public void Decode() 66 | { 67 | byte opcode = ram.Ram[pc]; 68 | int param = opcode & 0xf; 69 | byte data = ram.Ram[pc + 1]; 70 | 71 | // Helpers for when using Vx and Vy to make them easier to read 72 | byte x = (byte)param; 73 | byte y = (byte)((data >> 4) & 0xf); 74 | 75 | Console.SetCursorPosition(0, 0); 76 | Console.WriteLine("PC = {0:X4}", pc); 77 | 78 | pc += 2; 79 | 80 | switch (opcode >> 4) 81 | { 82 | case 0x0: 83 | switch (data) 84 | { 85 | case 0xe0: // CLS 86 | display.Clear(); 87 | break; 88 | 89 | case 0xee: // RET 90 | if (stack.Count > 0) 91 | { 92 | pc = stack.Pop(); 93 | } 94 | break; 95 | } 96 | break; 97 | 98 | case 0x1: // JP nnn 99 | pc = (ushort)((param * 256) + data); 100 | break; 101 | 102 | case 0x2: // CALL nnn 103 | if (stack.Count < 15) 104 | { 105 | stack.Push(pc); 106 | pc = (ushort)((param * 256) + data); 107 | } 108 | break; 109 | 110 | case 0x3: // SE Vx, byte 111 | if (v[x] == data) 112 | { 113 | pc += 2; // skip next instruction if equal 114 | } 115 | break; 116 | 117 | case 0x4: // SNE Vx, byte 118 | if (v[x] != data) 119 | { 120 | pc += 2; // skip next instruction if not equal 121 | } 122 | break; 123 | 124 | case 0x5: // SE Vx, Vy 125 | if (v[x] == v[y]) 126 | { 127 | pc += 2; // skip next instruction if equal 128 | } 129 | break; 130 | 131 | case 0x6: // LD Vx, byte 132 | v[x] = data; 133 | break; 134 | 135 | case 0x7: // ADD Vx, byte 136 | v[x] += data; 137 | break; 138 | 139 | case 0x8: // Maths ops 140 | byte flag; 141 | int result; 142 | 143 | switch (data & 0xf) 144 | { 145 | case 0x0: // LD Vx, Vy 146 | v[x] = v[y]; 147 | break; 148 | 149 | case 0x1: // OR Vx, Vy 150 | v[x] |= v[y]; 151 | v[0x0f] = 0; 152 | break; 153 | 154 | case 0x2: // AND Vx, Vy 155 | v[x] &= v[y]; 156 | v[0x0f] = 0; 157 | break; 158 | 159 | case 0x3: // XOR Vx, Vy 160 | v[x] ^= v[y]; 161 | v[0x0f] = 0; 162 | break; 163 | 164 | case 0x4: // ADC Vx, Vy 165 | result = v[x] + v[y]; 166 | v[x] = (byte)result; 167 | // If result is over 255, we overflowed, so set carry flag, otherwise clear it 168 | v[0xf] = (byte)(result > 255 ? 1 : 0); 169 | break; 170 | 171 | case 0x5: // SBC Vx, Vy 172 | // If Vx is more or equal Vy, we can't overflow, so set carry flag, otherwise clear it 173 | flag = (byte)(v[x] >= v[y] ? 1 : 0); 174 | v[x] -= v[y]; 175 | v[0xf] = flag; 176 | break; 177 | 178 | case 0x6: // SHR Vx 179 | //v[x] = v[y]; 180 | result = v[x] & 1; 181 | v[x] >>= 1; 182 | v[0xf] = (byte)result; 183 | break; 184 | 185 | case 0x7: // SUBN Vx, Vy 186 | // If Vy is more or equal Vx, we can't overflow, so set carry flag, otherwise clear it 187 | flag = (byte)(v[y] >= v[x] ? 1 : 0); 188 | v[x] = (byte)(v[y] - v[x]); 189 | v[0xf] = flag; 190 | break; 191 | 192 | case 0xe: // SHL Vx 193 | //v[x] = v[y]; 194 | result = (v[x] & 128) >> 7; 195 | v[x] <<= 1; 196 | v[0xf] = (byte)result; 197 | break; 198 | } 199 | break; 200 | 201 | case 0x9: // SNE Vx, Vy 202 | if (v[x] != v[y]) 203 | { 204 | pc += 2; // skip next instruction if not equal 205 | } 206 | break; 207 | 208 | case 0xa: // LD I, nnn 209 | i = (ushort)((param * 256) + data); 210 | break; 211 | 212 | case 0xb: // JP V0, nnn 213 | pc = (ushort)((param * 256) + data + v[0]); 214 | break; 215 | 216 | case 0xc: // RND Vx, byte 217 | v[x] = (byte)(rnd.Next(0, 255) & data); 218 | break; 219 | 220 | case 0xd: // DRW Vx, Vy, bytes 221 | if (CanDrawSprite) 222 | { 223 | v[0xf] = display.DrawSprite(v[x], v[y], data & 0xf, i); 224 | CanDrawSprite = false; 225 | } 226 | else 227 | { 228 | pc -= 2; 229 | } 230 | break; 231 | 232 | case 0xe: // Keyboard 233 | switch (data) 234 | { 235 | case 0x9e: // SKP Vx 236 | // Skip next instruction if key pressed 237 | if (keysPressed[v[x] & 0x0f]) 238 | { 239 | pc += 2; 240 | } 241 | break; 242 | 243 | case 0xa1: // SKNP Vx 244 | // Skip next instruction if key not pressed 245 | if (!keysPressed[v[x] & 0x0f]) 246 | { 247 | pc += 2; 248 | } 249 | break; 250 | } 251 | break; 252 | 253 | case 0xf: // Misc and keyboard 254 | switch (data) 255 | { 256 | case 0x7: // LD Vx, DT 257 | v[x] = dt; 258 | break; 259 | 260 | case 0xa: // LD Vx, K 261 | if (halted) 262 | { 263 | for (int k = 0; k < keysPressed.Length; k++) 264 | { 265 | if (keysPressed[k]) 266 | { 267 | halted = false; 268 | v[x] = (byte)k; 269 | keysPressed[k] = false; 270 | return; 271 | } 272 | } 273 | } 274 | 275 | halted = true; 276 | pc -= 2; 277 | break; 278 | 279 | case 0x15: // LD DT, Vx 280 | dt = v[x]; 281 | break; 282 | 283 | case 0x18: // LD ST, Vx 284 | st = v[x]; 285 | break; 286 | 287 | case 0x1e: // ADD I, Vx 288 | i += v[x]; 289 | break; 290 | 291 | case 0x29: // LD F, Vx 292 | i = (ushort)((v[x] & 0xF) * 5); 293 | break; 294 | 295 | case 0x33: // LD B, Vx 296 | ram.Ram[(i + 0) & 0xfff] = (byte)(v[x] / 100); 297 | ram.Ram[(i + 1) & 0xfff] = (byte)(v[x] / 10 % 10); 298 | ram.Ram[(i + 2) & 0xfff] = (byte)(v[x] % 10); 299 | break; 300 | 301 | case 0x55: // LD [I], Vx 302 | for (int reg = 0; reg <= x; reg++) 303 | { 304 | ram.Ram[(i + reg) & 0xfff] = v[reg]; 305 | } 306 | i++; 307 | break; 308 | 309 | case 0x65: // LD Vx, [I] 310 | for (int reg = 0; reg <= x; reg++) 311 | { 312 | v[reg] = ram.Ram[(i + reg) & 0xfff]; 313 | } 314 | i++; 315 | break; 316 | } 317 | 318 | break; 319 | } 320 | } 321 | } -------------------------------------------------------------------------------- /Chip8/Display.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | 3 | namespace Chip8; 4 | 5 | public class Display(Memory ram) 6 | { 7 | private const uint Ink = 0xffffffff; 8 | private const uint Paper = 0xff000000; 9 | private const int ScreenWidth = 64; 10 | private const int ScreenHeight = 32; 11 | 12 | public readonly byte[] Pixels = new byte[ScreenWidth * ScreenHeight * sizeof(uint)]; 13 | 14 | private readonly Memory ram = ram; 15 | private readonly byte[] screen = new byte[ScreenWidth * ScreenHeight]; 16 | 17 | public byte DrawSprite(int x, int y, int height, ushort dataAddr) 18 | { 19 | x %= ScreenWidth; 20 | y %= ScreenHeight; 21 | 22 | int collision = 0; 23 | 24 | for (int dy = y; dy < y + height && dy < ScreenHeight; dy++) 25 | { 26 | byte bits = ram.Ram[dataAddr + dy - y]; 27 | int yPos = dy * ScreenWidth; 28 | 29 | for (int dx = x; dx < x + 8 && dx < ScreenWidth; dx++) 30 | { 31 | int xyPos = yPos + dx; 32 | if ((bits & 0x80) != 0) 33 | { 34 | if (screen[xyPos] == 1) 35 | { 36 | collision = 1; 37 | } 38 | 39 | screen[xyPos] ^= 1; 40 | } 41 | 42 | bits <<= 1; 43 | } 44 | } 45 | 46 | return (byte)collision; 47 | } 48 | 49 | public void Clear() 50 | { 51 | Array.Clear(screen); 52 | } 53 | 54 | public void UpdatePixels(Span pixels) 55 | { 56 | for (int i = 0; i < pixels.Length; i++) 57 | { 58 | pixels[i] = screen[i] == 1 ? Ink : Paper; 59 | } 60 | } 61 | } -------------------------------------------------------------------------------- /Chip8/Machine.cs: -------------------------------------------------------------------------------- 1 | using SFML.Graphics; 2 | using SFML.System; 3 | using SFML.Window; 4 | using System; 5 | using System.IO; 6 | using System.Runtime.InteropServices; 7 | 8 | namespace Chip8; 9 | 10 | internal class Machine 11 | { 12 | private readonly Cpu cpu; 13 | private readonly Memory ram; 14 | private readonly Display display; 15 | private readonly Audio audio; 16 | private readonly bool[] KeysPressed; 17 | private readonly string romName; 18 | 19 | public Machine(string rom) 20 | { 21 | KeysPressed = new bool[16]; 22 | ram = new Memory(); 23 | audio = new Audio(); 24 | display = new Display(ram); 25 | cpu = new Cpu(display, ram, audio, KeysPressed); 26 | 27 | romName = rom; 28 | } 29 | public void Run() 30 | { 31 | var window = new RenderWindow(new VideoMode(1280, 640), "CHIP-8", Styles.Default); 32 | window.SetFramerateLimit(60); 33 | window.SetVerticalSyncEnabled(false); 34 | 35 | window.Closed += (s, e) => window.Close(); 36 | 37 | window.KeyPressed += OnKeyPressed; 38 | window.KeyReleased += OnKeyReleased; 39 | 40 | Texture texture = new(64, 32); 41 | Sprite frameBuffer = new(texture); 42 | frameBuffer.Scale = new Vector2f(20, 20); 43 | 44 | using (var fs = File.Open(romName, FileMode.Open)) 45 | { 46 | fs.Read(ram.Ram, 0x200, (int)fs.Length); 47 | } 48 | 49 | Clock fpsClock = new(); 50 | var pixels = MemoryMarshal.Cast(display.Pixels.AsSpan()); 51 | 52 | while (window.IsOpen) 53 | { 54 | float fps = 1 / fpsClock.Restart().AsSeconds(); 55 | 56 | window.DispatchEvents(); 57 | 58 | Console.SetCursorPosition(0, 2); 59 | Console.WriteLine("FPS: {0}", fps.ToString().PadRight(4)); 60 | 61 | cpu.CanDrawSprite = true; 62 | for (int i = 0; i < 500 / 60; i++) 63 | { 64 | cpu.Decode(); 65 | } 66 | 67 | display.UpdatePixels(pixels); 68 | texture.Update(display.Pixels); 69 | window.Draw(frameBuffer); 70 | 71 | window.Display(); 72 | } 73 | } 74 | 75 | private static int GetKeyIndex(Keyboard.Key key) 76 | { 77 | return key switch 78 | { 79 | Keyboard.Key.X => 0, 80 | Keyboard.Key.Num1 => 1, 81 | Keyboard.Key.Num2 => 2, 82 | Keyboard.Key.Num3 => 3, 83 | Keyboard.Key.Q => 4, 84 | Keyboard.Key.W => 5, 85 | Keyboard.Key.E => 6, 86 | Keyboard.Key.A => 7, 87 | Keyboard.Key.S => 8, 88 | Keyboard.Key.D => 9, 89 | Keyboard.Key.Z => 10, 90 | Keyboard.Key.C => 11, 91 | Keyboard.Key.Num4 => 12, 92 | Keyboard.Key.R => 13, 93 | Keyboard.Key.F => 14, 94 | Keyboard.Key.V => 15, 95 | _ => -1 96 | }; 97 | } 98 | 99 | private void OnKeyReleased(object sender, KeyEventArgs e) 100 | { 101 | int index = GetKeyIndex(e.Code); 102 | if (index != -1) 103 | { 104 | KeysPressed[index] = false; 105 | } 106 | } 107 | 108 | private void OnKeyPressed(object sender, KeyEventArgs e) 109 | { 110 | if (e.Code == Keyboard.Key.Escape) 111 | { 112 | (sender as Window).Close(); 113 | return; 114 | } 115 | 116 | int index = GetKeyIndex(e.Code); 117 | if (index != -1) 118 | { 119 | KeysPressed[index] = true; 120 | } 121 | } 122 | } 123 | -------------------------------------------------------------------------------- /Chip8/Memory.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | 3 | namespace Chip8; 4 | 5 | public class Memory 6 | { 7 | private static readonly byte[] fontData = 8 | [ 9 | 0xF0, 0x90, 0x90, 0x90, 0xF0, // 0 10 | 0x20, 0x60, 0x20, 0x20, 0x70, // 1 11 | 0xF0, 0x10, 0xF0, 0x80, 0xF0, // 2 12 | 0xF0, 0x10, 0xF0, 0x10, 0xF0, // 3 13 | 0x90, 0x90, 0xF0, 0x10, 0x10, // 4 14 | 0xF0, 0x80, 0xF0, 0x10, 0xF0, // 5 15 | 0xF0, 0x80, 0xF0, 0x90, 0xF0, // 6 16 | 0xF0, 0x10, 0x20, 0x40, 0x40, // 7 17 | 0xF0, 0x90, 0xF0, 0x90, 0xF0, // 8 18 | 0xF0, 0x90, 0xF0, 0x10, 0xF0, // 9 19 | 0xF0, 0x90, 0xF0, 0x90, 0x90, // A 20 | 0xE0, 0x90, 0xE0, 0x90, 0xE0, // B 21 | 0xF0, 0x80, 0x80, 0x80, 0xF0, // C 22 | 0xE0, 0x90, 0x90, 0x90, 0xE0, // D 23 | 0xF0, 0x80, 0xF0, 0x80, 0xF0, // E 24 | 0xF0, 0x80, 0xF0, 0x80, 0x80 // F 25 | ]; 26 | 27 | public Memory() 28 | { 29 | Ram = new byte[4096]; 30 | 31 | // Copy font data to ram[0] for convenience 32 | Array.Copy(fontData, Ram, fontData.Length); 33 | } 34 | 35 | public byte[] Ram { get; set; } 36 | } -------------------------------------------------------------------------------- /Chip8/Program.cs: -------------------------------------------------------------------------------- 1 | namespace Chip8; 2 | 3 | internal static class Program 4 | { 5 | private static void Main() 6 | { 7 | var machine = new Machine("4-flags.ch8"); 8 | machine.Run(); 9 | } 10 | } --------------------------------------------------------------------------------