First commit

.gitignore

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+.build/
+.clangd
+compile_commands.json

.gitmodules

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+[submodule "libs/z80"]
+	path = libs/z80
+	url = https://github.com/redcode/z80
+[submodule "libs/z"]
+	path = libs/z
+	url = https://github.com/EnricoTrudu/z

Makefile

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+CXX = g++
+BUILD = .build
+TARGET = emulator
+OPT = g -g
+DEFINE = -DCPU_Z80_STATIC -DCPU_Z80_USE_LOCAL_HEADER
+
+CFLAGS = -Wall -Wextra -std=c++20 -O$(OPT) $(DEFINE) -flto -Iinclude `sdl2-config --cflags` -Ilibs/z80/API/emulation/CPU -Ilibs/z/API
+LDFLAGS = -Wall -Wextra -O$(OPT) -flto `sdl2-config --libs` -lSDL2_image
+
+SRC = \
+src/main.cpp \
+libs/z80/sources/Z80.c \
+
+OBJ_1 = $(notdir $(SRC:.cpp=.o))
+OBJ_2 = $(notdir $(OBJ_1:.c=.o))
+OBJ = $(addprefix $(BUILD)/, $(OBJ_2))
+# We can't use this as it will use the wrong main
+# vpath %.c $(sort $(dir $(SRC)))
+vpath %.cpp $(dir $(SRC))
+vpath %.c $(dir $(SRC))
+
+.PHONY: all clean
+
+all: $(BUILD) $(BUILD)/$(TARGET)
+
+$(BUILD)/%.o: %.cpp Makefile | $(BUILD)
+	$(CXX) -c $(CFLAGS) $< -o $@
+
+$(BUILD)/%.o: %.c Makefile | $(BUILD)
+	$(CXX) -c $(CFLAGS) $< -o $@
+
+$(BUILD)/$(TARGET): $(OBJ) Makefile
+	$(CXX) $(LDFLAGS) $(OBJ) -o $@
+
+$(BUILD):
+	mkdir $@
+
+clean:
+	rm -fr $(BUILD)

libs/z

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+Subproject commit 28ec6ff73bad0528eb22f38f6ca0e53827723cb3

libs/z80

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+Subproject commit b60d21889e246250ee0cac63bd6c64230959fe3c

src/main.cpp

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+#include <bits/stdint-uintn.h>
+#include <cstring>
+#include <fstream>
+#include <stdexcept>
+#include <array>
+#include <filesystem>
+#include <functional>
+
+#include <SDL2/SDL.h>
+#include <SDL2/SDL_error.h>
+#include <SDL2/SDL_hints.h>
+#include <SDL2/SDL_image.h>
+#include <SDL2/SDL_log.h>
+#include <SDL2/SDL_main.h>
+#include <SDL2/SDL_render.h>
+#include <SDL2/SDL_video.h>
+#include <string>
+
+#include "Z/types/base.h"
+#include "Z80.h"
+
+template <int W, int H>
+class Emulator {
+	public:
+		Emulator(std::filesystem::path rom_name) {
+			// SDL
+			int render_flags = SDL_RENDERER_ACCELERATED;
+			int window_flags = 0;
+
+			if (SDL_Init(SDL_INIT_VIDEO) < 0) {
+				throw std::runtime_error("Failed to initialize SDL2: " + std::string(SDL_GetError()));
+			}
+
+			window = SDL_CreateWindow("Z80 Emulator", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, W*16, H*16, window_flags);
+			if (!window) {
+				throw std::runtime_error("Failed to open window: " + std::string(SDL_GetError()));
+			}
+
+			SDL_SetHint(SDL_HINT_RENDER_SCALE_QUALITY, "linear");
+			renderer = SDL_CreateRenderer(window, -1, render_flags);
+			if (!window) {
+				throw std::runtime_error("Failed to create rendere: " + std::string(SDL_GetError()));
+			}
+
+			if (!IMG_Init(IMG_INIT_PNG)) {
+				throw std::runtime_error("Failed to initialize SDL2_image: " + std::string(SDL_GetError()));
+			}
+
+			SDL_LogMessage(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO, "Loading '../convert-font/font.png'");
+			font = IMG_LoadTexture(renderer, "../convert-font/font.png");
+
+			if (!font) {
+				throw std::runtime_error("Failed to open font: " + std::string(IMG_GetError()));
+			}
+
+			// Z80
+			std::ifstream rom_file(rom_name, std::ios::in | std::ios::binary);
+
+			rom_file.seekg(0, std::ios::end);
+			size_t rom_size = rom_file.tellg();
+			rom_file.seekg(0, std::ios::beg);
+
+			rom_file.read(reinterpret_cast<char*>(memory.data()), rom_size);
+
+			z.context = this;
+			z.read = z_read;
+			z.write = z_write;
+			z.in = z_in;
+			z.out = z_out;
+			z.int_data = z_int_data;
+
+			z80_reset(&z);
+		}
+
+		~Emulator() {
+			SDL_DestroyRenderer(renderer);
+
+			SDL_DestroyWindow(window);
+
+			SDL_Quit();
+		}
+
+		static zuint8 z_read(void* context, zuint16 address) {
+			auto e = (Emulator<W,H>*)context;
+			return e->memory[address];
+		}
+
+		static void z_write(void* context, zuint16 address, zuint8 value) {
+			auto e = (Emulator<W,H>*)context;
+			e->memory[address] = value;
+		}
+
+		static zuint8 z_in(void* /* context */, zuint16 port) {
+			switch (port & 0xFF) {
+				case 0x03:
+					return 0x01;
+
+				// char
+				case 0x1E:
+					return 0x00;
+
+				// has_input
+				case 0x1F:
+					return 0x00;
+
+				default:
+					SDL_LogMessage(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO, "IO Read @ 0x%X\n", (port & 0xFF));
+
+					return 0x00;
+			}
+		}
+
+		static void z_out(void* context, zuint16 port, zuint8 value) {
+			auto e = (Emulator<W,H>*)context;
+
+			switch (port & 0xFF) {
+				case 0x02:
+					e->input(value);
+					break;
+
+				default:
+					SDL_LogMessage(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO, "IO Wrte 0x%X @ 0x%X\n", value, (port & 0xFF));
+					break;
+			}
+		}
+
+		static zuint32 z_int_data(void* /* context */) {
+			return 0x00;
+		}
+
+		void update() {
+			z80_run(&z, 1);
+		}
+
+		// @todo This should handle the input properly (same as fpga)
+		void input(char c) {
+			buffer[cursor.y*W + cursor.x] = c;
+
+			cursor.x++;
+			if (cursor.x > W) {
+				cursor.x = 0;
+				cursor.y++;
+			}
+		}
+
+		void draw_buffer() {
+			SDL_Rect src;
+			src.w = 16;
+			src.h = 16;
+
+			SDL_Rect dest;
+			dest.w = 16;
+			dest.h = 16;
+
+			SDL_SetTextureColorMod(font, 255, 255, 255);
+
+			for (int x = 0; x < W; ++x) {
+				for (int y = 0; y < H; ++y) {
+					char c = buffer[y*W + x];
+					src.x = (c % 16) * 16;
+					src.y = (c / 16) * 16;
+
+					dest.x = x * 16;
+					dest.y = y * 16;
+
+					SDL_RenderCopy(renderer, font, &src, &dest);
+				}
+			}
+		}
+
+		bool handle_events() {
+			SDL_Event event;
+
+			while (SDL_PollEvent(&event)) {
+				switch (event.type) {
+					case SDL_QUIT:
+						return false;
+
+					default:
+						break;
+				}
+			}
+
+			return true;
+		}
+
+		void prepare() {
+			SDL_SetRenderDrawColor(renderer, 96, 128, 255, 255);
+			SDL_RenderClear(renderer);
+		}
+
+		void render() {
+			SDL_RenderPresent(renderer);
+		}
+
+	private:
+		SDL_Renderer* renderer = nullptr;
+		SDL_Window* window = nullptr;
+		SDL_Texture* font = nullptr;
+
+		std::array<char, W*H> buffer = {0};
+
+		struct {
+			int x = 0;
+			int y = 0;
+		} cursor;
+
+		Z80 z;
+		std::array<uint8_t, 0xFFFF> memory;
+};
+
+int main() {
+	Emulator<80, 45> e("../../software/monitor/.build/rom_monitor.bin");
+
+	while (e.handle_events()) {
+		e.prepare();
+
+		e.update();
+
+		e.draw_buffer();
+
+		e.render();
+	}
+}