initial commit

.gitignore

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+.vscode
+build

error_codes.h

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+#pragma once
+enum {
+    SUCCESS = 0,
+    FAILURE = -1,
+
+    FAILURE_STD = 1 << 0,                     // 1  : marks a generic C library error
+    FAILURE_MEMORY = FAILURE_STD | (1 << 1),  // 3  : marks a memory related error
+
+    // SDL ERRORS
+    FAILURE_SDL = 1 << 1,                           // 2  : marks a generic SDL error
+    FAILURE_SDL_INIT = FAILURE_SDL | (1 << 2),      // 6  : marks an error during SDL initialisation
+    FAILURE_SDL_WINDOW = FAILURE_SDL | (1 << 3),    // 10 : marks an error with the window
+    FAILURE_SDL_RENDERER = FAILURE_SDL | (1 << 4),  // 18 : marks an error with the renderer
+
+    // GAME ERRORS
+    FAILURE_GAME = 1 << 2,  // 4  : marks a generic game error
+};

level.c

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+#include <stdbool.h>
+#include <SDL2/SDL.h>
+#include "level.h"
+
+//prepares the level to be in a playable state
+void level_init(Level* level) {}
+
+//updates the level
+void level_update(Level* level, bool* keys) {}

level.h

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+#pragma once
+#include <stdbool.h>
+#include <SDL2/SDL.h>
+
+typedef struct {
+    unsigned x;
+    unsigned y;
+} Position;
+
+typedef struct {
+    Position ball_pos;
+    Position bouncer_pos;
+} Level;
+
+
+void level_init(Level* level);
+void level_update(Level* level, bool* keys);

main.c

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+#include <SDL2/SDL.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <time.h>
+#include "error_codes.h"
+#include "renderer.h"
+#include "level.h"
+
+#define UPDATES_PER_SEC 50
+#define CLOCKS_PER_UPDATE (CLOCKS_PER_SEC / UPDATES_PER_SEC)
+#define CLOCKS_PER_UPDATE_F (((float)CLOCKS_PER_SEC) / UPDATES_PER_SEC)
+
+// initializes the game
+static int init(SDL_Window* window, SDL_Renderer* renderer, Level* level) {
+    level_init(level);
+    return renderer_init(&window, &renderer);
+}
+
+// called on each game update
+static bool update(Level* level, bool* keys, RenderData* render_data) {
+    clock_t clock_start = clock();
+
+    //update the event keys
+    {
+        SDL_Event e;
+        while (SDL_PollEvent(&e)) {
+            switch (e.type) {
+            case SDL_QUIT:
+                return false;
+                break;
+
+            case SDL_KEYDOWN:
+                keys[e.key.keysym.sym] = true;
+                break;
+            case SDL_KEYUP:
+                keys[e.key.keysym.sym] = false;
+                break;
+            }
+        }
+    }
+
+    // preform updates
+    {
+        level_update(level, keys); //update the level
+        renderer_update(render_data); //update the render
+    }
+
+    clock_t clock_end = clock();
+
+    // provide a delay if needed, otherwise log a warning
+    clock_t clock_diff = clock_end - clock_start;  // difference / how long the operations took
+    int remaining_ms = (int)((CLOCKS_PER_UPDATE_F - clock_diff) / CLOCKS_PER_SEC) * 1000;
+
+    if (remaining_ms < 0) {
+        (void)printf("delay between updates was %dms too long.", -remaining_ms);
+    }
+    else {
+        SDL_Delay(remaining_ms);  // wait the time in ms
+    }
+
+    return true;
+}
+
+// cleans up resources
+static void close(SDL_Window* window, SDL_Renderer* renderer) {
+    renderer_destroy(window, renderer);
+}
+
+// entry-point of the application
+int main(void) {
+    Level* level = NULL;            //stores the game's state
+    SDL_Window* window = NULL;      //the window that is given to the OS
+    SDL_Renderer* renderer = NULL;  //the renderer used to draw to the window
+    bool keys[322] = { 0 };         //stores the key states
+
+    // initialize
+    {
+        int code = init(window, renderer, level);
+        if (code != SUCCESS)
+            exit(code);
+    }
+
+    bool quit = false;
+
+    // TEMP: tell me that the program has been initialized
+    (void)printf("initialized!\n");
+
+    // game-loop
+    RenderData render_data = { window, renderer, level }; //contains the data which is used to render the game
+    while (update(level, keys, &render_data));
+
+    // frees media and shuts down SDL
+    close(window, renderer);
+    return 0;
+}

renderer.c

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+#include "renderer.h"
+
+#include <SDL2/SDL.h>
+#include <stdio.h>
+
+#include "error_codes.h"
+#include "level.h"
+
+#define SCREEN_WIDTH 960
+#define SCREEN_HEIGHT 640
+
+// initializes the window and renderer
+int renderer_init(SDL_Window** window, SDL_Renderer** renderer) {
+    // initialize SDL
+    if (SDL_Init(SDL_INIT_VIDEO) < 0) {
+        (void)printf("SDL Failed to initialize! SDL_Error: %s\n", SDL_GetError());
+        return FAILURE_SDL_INIT;
+    }
+
+    // init the window
+    *window = SDL_CreateWindow("Title", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, SCREEN_WIDTH, SCREEN_HEIGHT, SDL_WINDOW_SHOWN);
+    if (*window == NULL) {
+        (void)printf("Window failed to be created! SDL_Error: %s\n", SDL_GetError());
+        return FAILURE_SDL_WINDOW;
+    }
+
+    // create a renderer
+    *renderer = SDL_CreateRenderer(*window, -1, SDL_RENDERER_PRESENTVSYNC);
+
+    if (*renderer == NULL) {
+        (void)printf("Renderer failed to be created! SDL_Error: %s\n", SDL_GetError());
+        return FAILURE_SDL_RENDERER;
+    }
+
+    return SUCCESS;
+}
+
+// renders the screen
+void renderer_update(RenderData* render_data) {
+    int success = 0x0;
+    success | SDL_SetRenderDrawColor(render_data->renderer, 0x00, 0x00, 0x00, 0xFF);
+    success | SDL_RenderClear(render_data->renderer);
+    SDL_RenderPresent(render_data->renderer);
+
+    if (success != 0) {
+        printf("something went wrong during the render update! -> %d", success);
+    }
+}
+
+void renderer_destroy(SDL_Window* window, SDL_Renderer* renderer) {
+    SDL_DestroyWindow(window);
+    SDL_DestroyRenderer(renderer);
+    SDL_Quit();
+}

renderer.h

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+#pragma once
+
+#include <SDL2/SDL.h>
+#include "level.h"
+
+typedef struct {
+    SDL_Window* window;
+    SDL_Renderer* renderer;
+    Level* level;
+} RenderData;
+
+int renderer_init(SDL_Window** window, SDL_Renderer** renderer);
+void renderer_update(RenderData* render_data);
+void renderer_destroy(SDL_Window* window, SDL_Renderer* renderer);