load files from command line

src/addressSpace.cpp

@@ -16,11 +16,18 @@ void AddressSpace::mapBootrom() {
 
 void AddressSpace::loadBootrom(const std::string& filename) {
 	std::ifstream file;
-	if (const uintmax_t size = std::filesystem::file_size(filename); size != 256) {
+	file.open(filename, std::ios::binary);
+
+	if (!file.is_open()) {
+		std::cerr << "Bootrom was not found!\nQuitting!\n" << std::endl;
+		exit(1);
+	}
+
+	const uintmax_t size = std::filesystem::file_size(filename);
+	if (size != 256) {
 		std::cerr << "Bootrom was an unexpected size!\nQuitting!\n" << std::endl;
 		exit(1);
 	}
-	file.open(filename, std::ios::binary);
 	file.read(reinterpret_cast<char*>(bootrom), BOOTROM_SIZE);
 }
 

src/main.cpp

@@ -10,10 +10,15 @@ using json = nlohmann::json;
 void runJSONTests(GameBoy* gb);
 
 int main(int argc, char** argv) {
+	if (argc != 3) {
+		std::cout << "Usage: " << argv[0] << " <bios> <game>" << std::endl;
+		return -1;
+	}
+
 	auto* gb = new GameBoy();
 	gb->SDL2setup();
 	//runJSONTests(gb);
-	gb->start("../dmg_boot.bin", "../roms/DrMario.gb");
+	gb->start(argv[1], argv[2]);
 	gb->SDL2destroy();
 	delete gb;
 

src/ppu.cpp

@@ -352,7 +352,7 @@ void GameBoy::drawLine() {
 
 void GameBoy::SDL2setup() {
 	SDL_Init(SDL_INIT_EVERYTHING);
-	screen = SDL_CreateWindow("GBpp",
+	screen = SDL_CreateWindow("GameBoy++",
 	                          SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
 	                          RESOLUTION_X, RESOLUTION_Y,
 	                          0);