initial commit

.gitignore

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+.idea
+cmake-build-debug

CMakeLists.txt

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+cmake_minimum_required(VERSION 4.1)
+project(tibia C)
+
+set(CMAKE_C_STANDARD 11)
+
+find_package(SDL3 CONFIG REQUIRED)
+
+add_executable(tibia main.c
+        app.c
+        window.c
+        system.c
+        system.h
+        render.c
+        render.h
+        input.c
+        input.h
+        config.c
+        config.h)
+
+target_link_libraries(tibia SDL3::SDL3)

app.c

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+#include "app.h"
+#include "window.h"
+#include "render.h"
+#include "input.h"
+
+void App_Init(App_t *app) {
+    Window_Init_SDL();
+    System_QueryMetrics(&app->metrics);
+
+    Window_Init(app->metrics.screenWidth, app->metrics.screenHeight);
+
+    Config_Load_Settings(&app->configParams);
+
+    app->isRunning = true;
+}
+
+void App_Run(App_t *app) {
+    while (app->isRunning) {
+        Input_Poll(app);
+        Render_Frame();
+    }
+}
+
+void App_Shutdown(App_t *app) {
+    Window_Shutdown();
+}

app.h

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+#ifndef APP_H
+#define APP_H
+
+#include <stdbool.h>
+
+#include "config.h"
+#include "system.h"
+
+typedef struct App {
+    bool isRunning;
+    SystemMetrics_t metrics;
+    ConfigParams_t configParams;
+} App_t;
+
+void App_Init(App_t* app);
+void App_Run(App_t* app);
+void App_Shutdown(App_t* app);
+
+#endif

config.c

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+//
+// Created by rov on 12/26/25.
+//
+
+#include "config.h"
+#include <stdio.h>
+#include <string.h>
+#include <SDL3/SDL_log.h>
+
+void Config_Load_Settings(ConfigParams_t* configParams) {
+    FILE* configFile = fopen("CLIENT.CFG", "rb");
+
+    if (configFile != NULL) {
+        SDL_LogInfo(SDL_LOG_CATEGORY_CUSTOM, "Config_Load_Settings: loaded CLIENT.CFG");
+
+        fread(configParams->serverAddress, 1, 100, configFile);
+        fread(&configParams->serverPort, 1, 4, configFile);
+        fread(configParams->lastAccount, 1, 30, configFile);
+        fread(configParams->lastPassword, 1, 30, configFile);
+
+        fclose(configFile);
+        return;
+    }
+
+    SDL_LogInfo(SDL_LOG_CATEGORY_CUSTOM, "Config_Load_Settings: couldn't load CLIENT.CFG. Using default values.");
+
+    strcpy(configParams->serverAddress, "rrws27.uni-regensburg.de");
+    configParams->serverPort = 7171;
+    configParams->lastAccount[0] = '\0';
+    configParams->lastPassword[0] = '\0';
+}
+
+void Config_Save_Settings(ConfigParams_t* configParams) {
+    FILE* configFile = fopen("CLIENT.CFG", "wb");
+
+    if (configFile == NULL) {
+        SDL_LogError(SDL_LOG_CATEGORY_CUSTOM, "Config_Save_Settings: couldn't open config file.");
+        return;
+    }
+
+    fwrite(configParams->serverAddress, 1, 100, configFile);
+    fwrite(&configParams->serverPort, 1, 4, configFile);
+    fwrite(configParams->lastAccount, 1, 30, configFile);
+    fwrite(configParams->lastPassword, 1, 30, configFile);
+
+    fclose(configFile);
+}

config.h

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+//
+// Created by rov on 12/26/25.
+//
+
+#ifndef TIBIA_CONFIG_H
+#define TIBIA_CONFIG_H
+
+typedef struct ConfigParams {
+    char serverAddress[100];
+    long serverPort;
+    char lastAccount[30];
+    char lastPassword[30];
+} ConfigParams_t;
+
+void Config_Load_Settings(ConfigParams_t* configParams);
+void Config_Save_Settings(ConfigParams_t* configParams);
+
+#endif //TIBIA_CONFIG_H

input.c

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+//
+// Created by rov on 12/26/25.
+//
+
+#include "input.h"
+
+#include <SDL3/SDL.h>
+
+void Input_Poll(App_t *app) {
+    SDL_Event event;
+
+    while (SDL_PollEvent(&event)) {
+        switch (event.type) {
+            case SDL_EVENT_QUIT:
+                app->isRunning = false;
+                break;
+            default:
+                break;
+        }
+    }
+}

input.h

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+//
+// Created by rov on 12/26/25.
+//
+
+#ifndef TIBIA_INPUT_H
+#define TIBIA_INPUT_H
+
+#include "app.h"
+
+void Input_Poll(App_t* app);
+
+#endif //TIBIA_INPUT_H

main.c

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+#include "app.h"
+
+int main(int argc, char* argv[]) {
+    App_t app;
+    
+    App_Init(&app);
+    App_Run(&app);
+    App_Shutdown(&app);
+
+    return 0;
+}

render.c

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+//
+// Created by rov on 12/26/25.
+//
+
+#include "render.h"
+#include "window.h"
+
+void Render_Frame() {
+    SDL_Renderer* renderer = Window_GetRenderer();
+    SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
+    SDL_RenderClear(renderer);
+
+    SDL_RenderPresent(renderer);
+}

render.h

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+//
+// Created by rov on 12/26/25.
+//
+
+#ifndef TIBIA_RENDER_H
+#define TIBIA_RENDER_H
+
+void Render_Frame();
+
+#endif //TIBIA_RENDER_H

system.c

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+//
+// Created by rov on 12/26/25.
+//
+
+#include "system.h"
+#include <SDL3/SDL.h>
+
+void System_QueryMetrics(SystemMetrics_t *systemMetrics) {
+    SDL_Rect bounds;
+
+    const SDL_DisplayID displayId = SDL_GetPrimaryDisplay();
+    if (displayId && SDL_GetDisplayBounds(displayId, &bounds)) {
+        systemMetrics->screenWidth = bounds.w;
+        systemMetrics->screenHeight = bounds.h;
+        return;
+    }
+
+    // Fallback
+
+    SDL_LogError(SDL_LOG_CATEGORY_VIDEO, "System_QueryMetrics: couldn't get primary display bounds. Using fallback values.");
+
+    systemMetrics->screenWidth = 800;
+    systemMetrics->screenHeight = 600;
+}

system.h

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+//
+// Created by rov on 12/26/25.
+//
+
+#ifndef TIBIA_SYSTEM_H
+#define TIBIA_SYSTEM_H
+
+typedef struct SystemMetrics {
+    int screenWidth;
+    int screenHeight;
+} SystemMetrics_t;
+
+void System_QueryMetrics(SystemMetrics_t* systemMetrics);
+
+#endif //TIBIA_SYSTEM_H

window.c

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+#include "window.h"
+
+static SDL_Window *window;
+static SDL_Renderer *renderer;
+
+void Window_Init_SDL() {
+    SDL_Init(SDL_INIT_VIDEO);
+    SDL_SetHint(SDL_HINT_LOGGING, "*=info");
+}
+
+void Window_Init(int width, int height) {
+    SDL_CreateWindowAndRenderer(
+        "Tibia", width, height, 0, &window, &renderer);
+}
+
+void Window_Shutdown() {
+    SDL_DestroyRenderer(renderer);
+    SDL_DestroyWindow(window);
+    SDL_Quit();
+}
+
+SDL_Renderer *Window_GetRenderer() {
+    return renderer;
+}

window.h

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+#ifndef WINDOW_H
+#define WINDOW_H
+
+#include <SDL3/SDL.h>
+
+void Window_Init_SDL();
+void Window_Init(int width, int height);
+void Window_Shutdown();
+SDL_Renderer* Window_GetRenderer();
+
+#endif