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Chip-8.cpp
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Chip-8.cpp
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#include <string>
#include <SDL2/SDL.h>
#include <cassert>
#include <random>
#include <ctime>
#include <cstring>
#include <string>
#include <climits>
#include <filesystem>
#include "Chip-8.h"
#include "fontset.h"
#include "gfx.h"
#include "config.h"
#include "license.h"
#include "sdl_file_chooser.h"
#include "submodules/chip8asm/src/InputFile.h"
#include "submodules/chip8asm/src/parser.h"
#include "submodules/chip8asm/src/binary_generator.h"
namespace std_fs = std::filesystem;
#define _STR(x) #x
#define STR(x) _STR(x)
#define DEBUGGER_TEXTURE_W 300
#define DEBUGGER_TEXTURE_H 420
constexpr uint8_t keyMap[16]{
SDLK_x,
SDLK_1,
SDLK_2,
SDLK_3,
SDLK_q,
SDLK_w,
SDLK_e,
SDLK_a,
SDLK_s,
SDLK_d,
SDLK_y,
SDLK_c,
SDLK_4,
SDLK_r,
SDLK_f,
SDLK_v
};
constexpr uint8_t keyMapScancode[16]{
SDL_SCANCODE_X,
SDL_SCANCODE_1,
SDL_SCANCODE_2,
SDL_SCANCODE_3,
SDL_SCANCODE_Q,
SDL_SCANCODE_W,
SDL_SCANCODE_E,
SDL_SCANCODE_A,
SDL_SCANCODE_S,
SDL_SCANCODE_D,
SDL_SCANCODE_Y,
SDL_SCANCODE_C,
SDL_SCANCODE_4,
SDL_SCANCODE_R,
SDL_SCANCODE_F,
SDL_SCANCODE_V
};
static void renderText(
SDL_Renderer* renderer, SDL_Texture** fontCache,
int* cursorRow, int* cursorCol,
const std::string& text,
const SDL_Color& color={255, 255, 255, 255})
{
static constexpr int charWidthPx = 9;
static constexpr int charHeightPx = 16;
for (size_t i{}; i < text.length(); ++i)
{
const int character{text[i]};
switch (character)
{
case '\n':
++*cursorRow;
*cursorCol = 0;
break;
case '\t':
*cursorCol += 4;
break;
case '\v':
*cursorRow += 4;
*cursorCol = 0;
break;
case '\r':
*cursorCol = 0;
break;
case ' ':
++*cursorCol;
break;
default:
if (character >= '!' && character <= '~') // If printable character
{
SDL_Rect destRect{
*cursorCol * charWidthPx + 5, *cursorRow * charHeightPx,
charWidthPx, charHeightPx};
const int textureI{character - '!'};
SDL_SetTextureColorMod(fontCache[textureI], color.r, color.g, color.b);
SDL_SetTextureAlphaMod(fontCache[textureI], color.a);
if (SDL_RenderCopy(renderer, fontCache[textureI], nullptr, &destRect))
{
Logger::err << "Failed to copy character texture: " << SDL_GetError() << Logger::End;
}
++*cursorCol;
}
else // If unknown nonprintable character
{
++*cursorCol;
}
break;
}
}
}
static ByteList assembleFile(const std::string& filePath)
{
auto showFatalMessage{
[](const char* msg){
SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, "Assembler Error", msg, nullptr);
Logger::fatal << msg << Logger::End;
}
};
// ----- Read the input file -----
std::string fileContent;
try
{
InputFile file;
file.open(filePath);
fileContent = file.getContent();
}
catch (std::exception& e) { showFatalMessage(e.what()); }
// ----- Call the preprocessor -----
try
{
fileContent = Parser::preprocessFile(fileContent, filePath);
}
catch (std::exception& e) { showFatalMessage(e.what()); }
// ----- Parse the file -----
Parser::tokenList_t tokenList;
Parser::labelMap_t labelMap;
try
{
Parser::parseTokens(fileContent, filePath, &tokenList, &labelMap);
}
catch (std::exception& e) { showFatalMessage(e.what()); }
Logger::dbg << "Found " << tokenList.size() << " tokens and " << labelMap.size() << " labels" << Logger::End;
// ----- Generate the output -----
ByteList output;
try
{
output = generateBinary(tokenList, labelMap);
}
catch (std::exception& e) { showFatalMessage(e.what()); }
Logger::log << "Assembled to " << output.size() << " bytes" << Logger::End;
if (output.empty())
{
showFatalMessage("The assembler produced no output");
}
return output;
}
static void loadRom(const std::string& romFilename, int* romSize, uint8_t* memory, SDL_Window* window)
{
Logger::log << "Opening file: " << romFilename << Logger::End;
FILE *romFile = fopen(romFilename.c_str(), "rb");
if (!romFile)
{
Logger::err << "Unable to open file: " << romFilename << Logger::End;
SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, "CHIP-8 Emulator", (std::string("Unable to open ROM: ")+romFilename).c_str(), window);
std::exit(2);
}
fseek(romFile, 0, SEEK_END);
*romSize = ftell(romFile);
fseek(romFile, 0, SEEK_SET);
Logger::log << "File size: " << std::dec << *romSize << " / 0x" << std::hex << *romSize << " bytes" << Logger::End;
fread(memory + 512, 8, *romSize, romFile);
auto copied = ftell(romFile);
Logger::log << "Copied: " << std::dec << copied << std::hex << " bytes" << Logger::End;
if (copied != *romSize)
{
Logger::err << "Unable to copy to buffer" << Logger::End;
SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, TITLE, "Unable to copy file content to memory", window);
std::exit(2);
}
fclose(romFile);
}
Chip8::Chip8(const std::string& romFilename)
: m_sp{}
{
std::srand(std::time(nullptr)); // initialize rand()
std::rand(); // drop the first result
Logger::log << '\n' << "----- setting up video -----" << Logger::End;
Chip8::initVideo();
// Load the font set to the memory
Chip8::loadFontSet();
Logger::log << '\n' << "----- loading file -----" << Logger::End;
Chip8::loadFile(romFilename);
}
void Chip8::loadFile(const std::string& romFilename)
{
m_romFilename = romFilename;
if (strToLower(std_fs::path{romFilename}.extension().string()).compare(".asm") == 0) // Assembly file, assemble it first
{
Logger::log << "Assembly file, assembling it" << Logger::End;
auto data = assembleFile(romFilename);
//memcpy(m_memory, data.data(), std::min(data.size(), (size_t)0x1000));
size_t copiedBytes{};
for (; copiedBytes < std::min(data.size(), (size_t)0x1000); ++copiedBytes)
{
m_memory[512+copiedBytes] = data[copiedBytes];
}
Logger::log << "Copied " << copiedBytes << " bytes to memory" << Logger::End;
}
else // Probably ROM, just simply copy
{
Logger::log << "ROM file, copying it" << Logger::End;
loadRom(romFilename, &m_romSize, m_memory, m_window);
}
// Dump the memory
Logger::log << '\n' << "--- START OF MEMORY ---" << Logger::End;
for (int i{}; i < 0xfff + 1; ++i)
{
Logger::log << static_cast<int>(m_memory[i]) << ' ';
if (i == 0x200 - 1)
Logger::log << '\n' << "--- START OF PROGRAM ---" << '\n';
if (i == (m_romSize + 511))
Logger::log << '\n' << "--- END OF PROGRAM ---" << '\n';
if (i == 0xfff)
Logger::log << '\n' << "--- END OF MEMORY ---" << '\n';
}
Logger::log << Logger::End;
}
void Chip8::loadFontSet()
{
Logger::log << '\n' << "--- FONT SET --- " << '\n';
for (int i{}; i < 80; ++i)
Logger::log << static_cast<int>(fontset[i]) << ' ';
Logger::log << '\n' << "--- END OF FONT SET ---" << Logger::End;
// copy the font set to the memory
for (int i{}; i < 80; ++i)
{
m_memory[i] = fontset[i];
}
}
void Chip8::initVideo()
{
Logger::log << "Initializing SDL" << Logger::End;
if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO))
{
Logger::err << "Unable to initialize SDL. " << SDL_GetError() << Logger::End;
std::exit(2);
}
Logger::log << "Creating window" << Logger::End;
m_window = SDL_CreateWindow(
TITLE " - Loading...",
SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED,
64 * 20, 32 * 20,
SDL_WINDOW_ALLOW_HIGHDPI | SDL_WINDOW_RESIZABLE);
if (!m_window)
{
Logger::err << "Unable to create window. " << SDL_GetError() << Logger::End;
std::exit(2);
}
Logger::log << "Creating renderer" << Logger::End;
m_renderer = SDL_CreateRenderer(m_window, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_TARGETTEXTURE);
if (!m_renderer)
{
Logger::err << "Unable to create renderer. " << SDL_GetError() << Logger::End;
std::exit(2);
}
m_contentTexture = SDL_CreateTexture(
m_renderer, SDL_PIXELFORMAT_RGB24, SDL_TEXTUREACCESS_STREAMING,
64, 32);
if (!m_contentTexture)
{
Logger::err << "Unable to create content texture. " << SDL_GetError() << Logger::End;
std::exit(2);
}
m_debuggerTexture = SDL_CreateTexture(
m_renderer, SDL_PIXELFORMAT_RGB24, SDL_TEXTUREACCESS_TARGET, DEBUGGER_TEXTURE_W, DEBUGGER_TEXTURE_H);
if (!m_debuggerTexture)
{
Logger::err << "Unable to create debugger texture. " << SDL_GetError() << Logger::End;
std::exit(2);
}
Logger::log << "Initializing SDL2_ttf" << Logger::End;
if (TTF_Init())
{
Logger::err << "Unable to initialize SDL2_ttf: " << TTF_GetError() << Logger::End;
std::exit(2);
}
Logger::log << "Loading font" << Logger::End;
TTF_Font* font = TTF_OpenFont("Anonymous_Pro.ttf", 16);
if (!font)
{
Logger::err << "Unable to load font: " << TTF_GetError() << Logger::End;
SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, TITLE, "Unable to load font", m_window);
std::exit(2);
}
Logger::log << "Caching font..." << Logger::End;
for (int i{'!'}; i <= '~'; ++i)
{
char str[2]{(char)i};
SDL_Surface* charSurface{TTF_RenderText_Blended(font, (const char*)&str, {255, 255, 255, 255})};
if (!charSurface)
{
Logger::err << "Failed to render font: " << SDL_GetError() << Logger::End;
std::exit(2);
}
SDL_Texture* charTexture{SDL_CreateTextureFromSurface(m_renderer, charSurface)};
if (!charTexture)
{
Logger::err << "Failed to convert font surface to texture: " << SDL_GetError() << Logger::End;
std::exit(2);
}
SDL_FreeSurface(charSurface);
m_fontCache[i - '!'] = charTexture;
}
TTF_CloseFont(font);
TTF_Quit();
SDL_SetRenderDrawColor(m_renderer, 0, 255, 0, 255);
SDL_RenderClear(m_renderer);
updateRenderer();
SDL_SetWindowMinimumSize(m_window, 64 * 2, 32 * 2);
}
std::string Chip8::saveScreenshot() const
{
auto generateFilename{[](){ // -> char*
char* buffer = new char[64]{};
auto epochTime = time(nullptr);
strftime(buffer, 64, "%y%m%d%H%M%S.bmp", localtime(&epochTime));
buffer[63] = 0;
return buffer;
}};
uint8_t* pixelData{};
int pitch{};
if (SDL_LockTexture(m_contentTexture, nullptr, (void**)&pixelData, &pitch))
{
Logger::err << "Error: Failed to lock content texture to save screenshot: " << SDL_GetError() << Logger::End;
return "";
}
SDL_Surface* surface = SDL_CreateRGBSurfaceWithFormatFrom(pixelData, 64, 32, 24, pitch, SDL_PIXELFORMAT_RGB24);
if (!surface)
{
Logger::err << "Failed to create surface for screenshot: " << SDL_GetError() << Logger::End;
SDL_UnlockTexture(m_contentTexture);
return "";
}
std::string filename = generateFilename();
Logger::log << "Saving screenshot as \"" << filename << "\"" << Logger::End;
if (SDL_SaveBMP(surface, filename.c_str()))
{
Logger::err << "Failed to save screenshot: " << SDL_GetError() << Logger::End;
}
SDL_FreeSurface(surface);
SDL_UnlockTexture(m_contentTexture);
return filename;
}
void Chip8::deinit()
{
if (m_hasDeinitCalled)
return;
SDL_SetWindowTitle(m_window, TITLE " - Exiting...");
updateRenderer();
Logger::log << '\n' << "----- deinit -----" << Logger::End;
SDL_DestroyTexture(m_contentTexture);
SDL_DestroyTexture(m_debuggerTexture);
SDL_DestroyRenderer(m_renderer);
SDL_DestroyWindow(m_window);
SDL_Quit();
m_hasDeinitCalled = true;
}
Chip8::~Chip8()
{
deinit();
}
void Chip8::renderFrameBuffer()
{
uint8_t* pixelData{};
int pitch{};
if (SDL_LockTexture(m_contentTexture, nullptr, (void**)&pixelData, &pitch))
{
Logger::err << "Error: Failed to lock content texture: " << SDL_GetError() << Logger::End;
return;
}
for (int x{}; x < 64; ++x)
{
for (int y{}; y < 32; ++y)
{
if (m_frameBuffer.get(x, y))
Gfx::drawPoint(pixelData, pitch, x, y, SDL_Color{FG_COLOR_R, FG_COLOR_G, FG_COLOR_B, 255});
else
Gfx::drawPoint(pixelData, pitch, x, y, SDL_Color{BG_COLOR_R, BG_COLOR_G, BG_COLOR_B, 255});
}
}
SDL_UnlockTexture(m_contentTexture);
m_renderFlag = false;
}
void Chip8::fetchOpcode()
{
// Catch the access out of the valid memory address range (0x00 - 0xfff)
assert(m_pc <= 0xffe);
if (m_pc > 0xffe)
{
panic("PC out of range");
}
// We swap the upper and lower bits.
// The opcode is 16 bits long, so we have to
// shift the left part of the opcode and add the right part.
m_opcode = (m_memory[m_pc] << 8) | m_memory[m_pc + 1];
#if VERBOSE_LOG
Logger::log << std::hex;
Logger::log << "PC: 0x" << m_pc << Logger::End;
Logger::log << "Current opcode: 0x" << m_opcode << Logger::End;
#endif
m_pc += 2;
}
void Chip8::updateInfoMessage()
{
if (m_infoMessageTimeRemaining <= 0)
return;
std::string messageStr;
switch (m_infoMessage)
{
case InfoMessageValue::None:
return;
case InfoMessageValue::Pause:
messageStr = "Paused.";
break;
case InfoMessageValue::Unpause:
messageStr = "Unpaused.";
break;
case InfoMessageValue::Reset:
messageStr = "Reset.";
break;
case InfoMessageValue::Screenshot:
assert(m_infoMessageExtra.length());
messageStr = "Saved screenshot to \"" + m_infoMessageExtra + "\".";
break;
case InfoMessageValue::EnableSteppingMode:
messageStr = "Enabled stepping mode.";
break;
case InfoMessageValue::DisableSteppingMode:
messageStr = "Disabled stepping mode.";
break;
case InfoMessageValue::DecrementSpeed:
messageStr = "Decremented emulation speed.";
break;
case InfoMessageValue::IncrementSpeed:
messageStr = "Incremented emulation speed.";
break;
case InfoMessageValue::DumpState:
messageStr = "Dumped state to terminal.";
break;
case InfoMessageValue::ToggleCompatShiftYRegInsteadOfX:
messageStr = "Toggled shift Y register instead of X to "+std::string(m_compat_shiftYRegInsteadOfX ? "TRUE" : "FALSE");
break;
case InfoMessageValue::ToggleCompatIncIAfterRegFillLoad:
messageStr = "Toggled increment I after full register fill/load to "+std::string(m_compat_incIAfterRegFillLoad ? "TRUE" : "FALSE");
break;
}
{
int cursorRow{};
int cursorCol{};
uint8_t alpha = 255 * std::min(m_infoMessageTimeRemaining, 1.0f);
renderText(m_renderer, m_fontCache, &cursorRow, &cursorCol, messageStr, {MESSAGE_COLOR_R, MESSAGE_COLOR_G, MESSAGE_COLOR_B, alpha});
}
m_infoMessageTimeRemaining -= m_frameDelay / 1000.0f;
}
void Chip8::updateOverlay()
{
if (!m_shouldShowKeyboardHelp)
return;
std::string messageStr =
std::string("------- Keybindings -------")
+ "\nPause: " + SDL_GetKeyName(SHORTCUT_KEYCODE_PAUSE)
+ "\nFullscreen: " + SDL_GetKeyName(SHORTCUT_KEYCODE_FULLSCREEN)
+ "\nStepping mode: " + SDL_GetKeyName(SHORTCUT_KEYCODE_STEPPING_MODE)
+ "\nStep: " + SDL_GetKeyName(SHORTCUT_KEYCODE_STEP_INST)
+ "\nToggle cursor: " + SDL_GetKeyName(SHORTCUT_KEYCODE_TOGGLE_CURSOR)
+ "\nDebug mode: " + SDL_GetKeyName(SHORTCUT_KEYCODE_DEBUG_MODE)
+ "\nQuit: " + SDL_GetKeyName(SHORTCUT_KEYCODE_QUIT)
+ "\nDump state: " + SDL_GetKeyName(SHORTCUT_KEYCODE_DUMP_STATE)
+ "\nIncrement speed: " + SDL_GetKeyName(SHORTCUT_KEYCODE_INC_SPEED)
+ "\nDecrement speed: " + SDL_GetKeyName(SHORTCUT_KEYCODE_DEC_SPEED)
+ "\nReset state: " + SDL_GetKeyName(SHORTCUT_KEYCODE_RESET)
+ "\nTake screenshot: " + SDL_GetKeyName(SHORTCUT_KEYCODE_SCREENSHOT)
+ "\nCompat: Shift Y Register\n instead X: " + SDL_GetKeyName(SHORTCUT_KEYCODE_TOGGLE_COMPAT_SHIFTYREG)
+ "\nCompat: Increment I after\n full register fill/load: " + SDL_GetKeyName(SHORTCUT_KEYCODE_TOGGLE_COMPAT_INCI)
;
int cursorRow{2};
int cursorCol{};
renderText(m_renderer, m_fontCache, &cursorRow, &cursorCol, messageStr, {MESSAGE_COLOR_R, MESSAGE_COLOR_G, MESSAGE_COLOR_B, 255});
SDL_version version{};
SDL_GetVersion(&version);
cursorRow += 2;
cursorCol = 0;
messageStr =
"----------- Compilation info -----------"
"\nCompiler version: "
#ifdef __VERSION__
__VERSION__
#else
"N/A"
#endif
"\nOptimizations: "
#ifdef __OPTIMIZE__
"ON"
#else
"OFF"
#endif
"\nSize optimizations: "
#ifdef __OPTIMIZE_SIZE__
"ON"
#else
"OFF"
#endif
"\nChar size: "
#ifdef CHAR_BIT
STR(CHAR_BIT)
#else
"N/A"
#endif
" bits"
"\nPointer size: "
+std::to_string(sizeof(void*)*8)+
" bits"
"\nByte order: "
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
"Little Endian"
#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
"Big Endian"
#elif __BYTE_ORDER__ == __ORDER_PDP_ENDIAN__
"PDP Endian"
#else
"N/A"
#endif
"\nCompiled at: "
#ifdef __DATE__
__DATE__
#else
"N/A"
#endif
" "
#ifdef __TIME__
__TIME__
#else
"N/A"
#endif
"\nCompiled SDL version: "
STR(SDL_MAJOR_VERSION)
"."
STR(SDL_MINOR_VERSION)
"."
STR(SDL_PATCHLEVEL)
"\nLinked SDL version: "
+std::to_string(version.major)+
"."
+std::to_string(version.minor)+
"."
+std::to_string(version.patch)
;
renderText(m_renderer, m_fontCache, &cursorRow, &cursorCol, messageStr, {MESSAGE_COLOR_R, MESSAGE_COLOR_G, MESSAGE_COLOR_B, 255});
cursorRow += 3;
cursorCol = 0;
messageStr =
"Licensed under the MIT License\n"
"License at: https://github.com/timre13/Chip-8_emulator/blob/master/LICENSE.txt\n"
"Source code at: https://github.com/timre13/Chip-8_emulator\n"
;
renderText(m_renderer, m_fontCache, &cursorRow, &cursorCol, messageStr, {MESSAGE_COLOR_R, MESSAGE_COLOR_G, MESSAGE_COLOR_B, 255});
}
void Chip8::panic(const std::string& message)
{
Logger::err << "PANIC: " << message << Logger::End;
Logger::log << '\n' << dumpStateToStr() << Logger::End;
auto _renderText{[this](const std::string& text){
int cursorRow{};
int cursorCol{};
renderText(m_renderer, m_fontCache, &cursorRow, &cursorCol, text, {PANIC_FG_COLOR_R, PANIC_FG_COLOR_G, PANIC_FG_COLOR_B, 255});
}};
std::string textToRender =
"Fatal error: " + message + "\nThis is probably caused by an invalid/damaged ROM.\n\n\n" + dumpStateToStr(false) +
"\n\nMore information in the terminal.\nPress escape to exit.";
SDL_SetWindowFullscreen(m_window, 0);
SDL_ShowCursor(true);
while (true)
{
SDL_Event event;
SDL_PollEvent(&event);
if (event.type == SDL_QUIT || (event.type == SDL_KEYUP && event.key.keysym.sym == SDLK_ESCAPE))
break;
SDL_SetRenderDrawColor(m_renderer, PANIC_BG_COLOR_R, PANIC_BG_COLOR_G, PANIC_BG_COLOR_B, 255);
SDL_RenderClear(m_renderer);
_renderText(textToRender);
SDL_RenderPresent(m_renderer);
SDL_Delay(100);
}
std::abort();
}
void Chip8::whenWindowResized(int width, int height)
{
Logger::log << "Window resized" << Logger::End;
m_windowWidth = width;
m_windowHeight = height;
// If the debugger is active, leave space for it in the window
if (m_isDebugMode)
width -= DEBUGGER_TEXTURE_W;
int horizontalScale{width / 64};
int verticalScale{height / 32};
m_scale = std::min(horizontalScale, verticalScale);
renderFrameBuffer();
}
void Chip8::copyTexturesToRenderer()
{
SDL_SetRenderDrawColor(m_renderer, 0, 0, 0, 255);
SDL_RenderClear(m_renderer);
{ // Game content texture
SDL_Rect dstRect{0, 0, 64 * m_scale, 32 * m_scale};
SDL_RenderCopy(m_renderer, m_contentTexture, nullptr, &dstRect);
}
if (m_isDebugMode)
{
SDL_Rect dstRect{m_windowWidth - DEBUGGER_TEXTURE_W, 0, DEBUGGER_TEXTURE_W, DEBUGGER_TEXTURE_H};
SDL_RenderCopy(m_renderer, m_debuggerTexture, nullptr, &dstRect);
}
}
void Chip8::toggleFullscreen()
{
m_isFullscreen = !m_isFullscreen;
SDL_SetWindowFullscreen(m_window, m_isFullscreen ? SDL_WINDOW_FULLSCREEN_DESKTOP : 0);
SDL_ShowCursor(!m_isFullscreen);
// Render the frame buffer with the new scaling
renderFrameBuffer();
}
void Chip8::toggleDebugMode()
{
m_isDebugMode = !m_isDebugMode;
int w, h;
SDL_GetWindowSize(m_window, &w, &h);
// Call the window resize function to calculate the new
// scale, so the debug info can fit in the window
whenWindowResized(w, h);
}
void Chip8::toggleCompatShiftYRegInsteadOfX()
{
m_compat_shiftYRegInsteadOfX = !m_compat_shiftYRegInsteadOfX;
}
void Chip8::toggleCompatIncIAfterRegFillLoad()
{
m_compat_incIAfterRegFillLoad = !m_compat_incIAfterRegFillLoad;
}
std::string Chip8::dumpStateToStr(bool dumpAll/*=true*/)
{
std::stringstream output;
if (dumpAll)
{
output << "Memory:\n";
output << std::hex;
for (int i{}; i < 0x1000; ++i)
{
output << std::setw(2) << std::setfill('0') << +m_memory[i] << ' ';
if (i % 32 == 31)
output << '\n';
}
output << "\nFramebuffer:\n";
for (int i{}; i < 64 * 32; ++i)
{
output << +m_frameBuffer.get(i) << ' ';
if (i % 64 == 63)
output << '\n';
}
output << '\n';
}
output << "PC=" << std::setw(4) << std::setfill('0') << +m_pc
<< ", Op=" << std::setw(4) << std::setfill('0') << +m_opcode
<< ", SP=" << std::setw(1) << std::setfill('0') << +m_sp
<< ", I=" << std::setw(4) << std::setfill('0') << +m_indexReg
<< ", DT=" << std::setw(2) << std::setfill('0') << +m_delayTimer
<< ", ST=" << std::setw(2) << std::setfill('0') << +m_soundTimer
<< '\n';
for (int i{}; i < 16; ++i)
{
output << i << '=' << std::setw(2) << std::setfill('0') << +m_registers.get(i, true);
if (i != 15)
output << ", ";
}
output << "\n\nStack:\n";
for (int i{15}; i > -1; --i)
{
output << std::setw(4) << std::setfill('0') << m_stack[i];
if (i + 1 == m_sp)
output << " <-"; // Mark the stack pointer
output << '\n';
}
return output.str();
}
void Chip8::renderDebugInfoIfInDebugMode()
{
if (!m_isDebugMode)
return;
if (SDL_SetRenderTarget(m_renderer, m_debuggerTexture))
{
Logger::err << "Failed to set render target: " << SDL_GetError() << Logger::End;
return;
}
SDL_SetRenderDrawColor(m_renderer, 50, 50, 50, 255);
SDL_RenderClear(m_renderer);
int cursorRow{};
int cursorCol{};
auto _renderText{[this, &cursorRow, &cursorCol]
(const std::string& text, const SDL_Color& color={255, 255, 255, 255}){
renderText(m_renderer, m_fontCache, &cursorRow, &cursorCol, text, color);
}};
_renderText("Opcode: " + to_hex(m_opcode) + "\n\n");
_renderText("PC: " + to_hex(m_pc) + "\n\n");
_renderText("I: " + to_hex(m_indexReg) + "\n\n");
_renderText("SP: " + to_hex(m_sp) + "\n\n");
_renderText("Stack:\n");
for (int i{15}; i >= 0; --i)
_renderText(to_hex(m_stack[i]) + "\n");
constexpr int indent = 17;
cursorRow = 0;
cursorCol = indent;
_renderText("Registers:\n");
for (int i{}; i < 16; ++i)
{
cursorCol = indent;
const bool isRead{m_registers.getIsRegisterRead(i)};
const bool isWritten{m_registers.getIsRegisterWritten(i)};
SDL_Color textColor{255, 255, 255, 255};
if (isRead && isWritten)
textColor = {255, 255, 0, 255};
else if (isRead)
textColor = {0, 255, 0, 255};
else if (isWritten)
textColor = {255, 0, 0, 255};
_renderText(to_hex(i, 1) + ": " + to_hex(m_registers.get(i, true)) + "\n", textColor);
}
_renderText("\n");
cursorCol = indent;
_renderText("DT: " + to_hex(m_delayTimer) + "\n");
cursorCol = indent;
_renderText("ST: " + to_hex(m_soundTimer) + "\n\n");
if (m_isReadingKey)
{
cursorCol = indent;
_renderText("Reading keys");
}
if (SDL_SetRenderTarget(m_renderer, nullptr))
{
Logger::err << "Failed to reset render target: " << SDL_GetError() << Logger::End;
}
}
void Chip8::updateWindowTitle()
{
if (m_isPaused)
SDL_SetWindowTitle(m_window, TITLE " - [PAUSED]");
else
SDL_SetWindowTitle(m_window, (TITLE " - Speed: " + std::to_string(m_emulSpeedPerc) + "%").c_str());
}
void Chip8::reset(bool reloadFile/*=true*/)
{
Logger::log << "RESET!" << Logger::End;
m_pc = 0x200;
m_sp = 0;
m_opcode = 0;
m_indexReg = 0;
m_delayTimer = 0;
m_soundTimer = 0;
m_isReadingKey = false;
m_timerDecrementCountdown = 16.67;
m_renderFlag = true;
for (int i{}; i < 16; ++i)
m_stack[i] = 0;
for (int i{}; i < 16; ++i)
m_registers.set(i, 0, true);
m_registers.clearReadWrittenFlags();
std::memset(m_memory, 0, 0x1000);
m_frameBuffer.clear();
loadFontSet();
if (reloadFile)
loadFile(m_romFilename);
renderDebugInfoIfInDebugMode();
renderFrameBuffer();
}
void Chip8::emulateCycle()
{
fetchOpcode();
m_timerDecrementCountdown -= m_frameDelay;
auto logOpcode{[](const std::string &str){
#if VERBOSE_LOG
Logger::log << str << Logger::End;
#else
(void)str;
#endif
}};
Logger::log << std::hex;
switch (m_opcode & 0xf000)
{
case 0x0000:
switch (m_opcode & 0x0fff)
{
case 0x0000:
logOpcode("NOP");
break;
case 0x00e0: // CLS
logOpcode("CLS");
m_frameBuffer.clear();
m_renderFlag = true;
break;
case 0x00ee: // RET
logOpcode("RET");
m_pc = m_stack[m_sp - 1];
m_stack[m_sp - 1] = 0;
--m_sp;
break;
default:
panic("Invalid opcode.");
}
break;
case 0x1000: // JMP
logOpcode("JMP");
m_pc = m_opcode & 0x0fff;
break;
case 0x2000: // CALL
logOpcode("CALL");
++m_sp;
m_stack[m_sp-1] = m_pc;
m_pc = (m_opcode & 0x0fff);
break;
case 0x3000: // SE
logOpcode("SE");
if (m_registers.get((m_opcode & 0x0f00) >> 8) == (m_opcode & 0x00ff))
m_pc += 2;
break;
case 0x4000: // SNE
logOpcode("SNE");
if (m_registers.get((m_opcode & 0x0f00) >> 8) != (m_opcode & 0x00ff))
m_pc += 2;
break;
case 0x5000: // SE Vx, Vy
logOpcode("SE Vx, Vy");
if (m_registers.get((m_opcode & 0x0f00) >> 8) == m_registers.get((m_opcode & 0x00f0) >> 4))
m_pc += 2;
break;
case 0x6000: // LD Vx, byte
logOpcode("LD Vx, byte");
m_registers.set((m_opcode & 0x0f00) >> 8, m_opcode & 0x00ff);