best game of 2022

meson.build

@@ -1,9 +1,10 @@
-project('rotcpu', 'cpp')
+project('fish-simulator', 'c')
 
 sdl2_dep = dependency('sdl2')
+sdl2_image_dep = dependency('sdl2_image')
 
 executable(
-    'rotcpuemu',
+    'fish-simulator',
-    './src/main.cpp',
+    './src/main.c',
-    dependencies : [sdl2_dep]
+    dependencies : [sdl2_dep, sdl2_image_dep]
 )

src/main.c

@@ -0,0 +1,252 @@
+#include "SDL.h"
+#include "SDL_events.h"
+#include "SDL_rect.h"
+#include "SDL_render.h"
+#include "SDL_image.h"
+#include "SDL_timer.h"
+#include "SDL_video.h"
+
+#define FISHES_MAX 1024
+#define SIMULATION_DELTA_TIME (1.0f / 60.0f)
+
+enum fish_type {
+    FISH_TYPE_NORMAL,
+    FISH_TYPE_ANGRY
+};
+
+enum fish_state {
+    FISH_STATE_NONE,
+    FISH_STATE_INIT,
+    FISH_STATE_WANDER_PICK_POINT,
+    FISH_STATE_WANDER_TRANSITION,
+    FISH_STATE_WANDER_DONE
+};
+
+struct fish {
+    int x, y, w, h;
+    enum fish_type type;
+    enum fish_state state;
+
+    /* state arguments */
+    float wander_start_x, wander_start_y, wander_target_x, wander_target_y, wander_step; /* FISH_STATE_WANDER_* */
+};
+
+struct app {
+    struct fish *fishes[FISHES_MAX];
+    int fishes_count;
+    SDL_Window *window;
+    SDL_Renderer *renderer;
+
+    SDL_Texture *fish_texture;
+    SDL_Texture *angry_fish_texture;
+};
+
+float lerp(float a, float b, float t)
+{
+    return a + (b - a) * t;
+}
+
+void scc(int code)
+{
+    if (code < 0) {
+        fprintf(stderr, "SDL ERROR: %s\n", SDL_GetError());
+        exit(1);
+    }
+}
+
+void *scp(void *ptr)
+{
+    if (ptr == NULL) {
+        fprintf(stderr, "SDL ERROR: %s\n", SDL_GetError());
+        exit(1);
+    }
+
+    return ptr;
+}
+
+int fishes_add(struct app *app, int x, int y, int w, int h, enum fish_type type)
+{
+    struct fish *new_fish = malloc(sizeof(struct fish));
+    new_fish->x = x;
+    new_fish->y = y;
+    new_fish->w = w;
+    new_fish->h = h;
+    new_fish->type = type;
+    new_fish->state = FISH_STATE_INIT;
+
+    for (int i = 0; i < FISHES_MAX; i++) {
+        if (app->fishes[i] == NULL) {
+            app->fishes[i] = new_fish;
+            app->fishes_count++;
+            return i;
+        }
+    }
+
+    return -1;
+}
+
+void fish_update(const struct app *app, struct fish *fish, float delta_time)
+{
+    switch (fish->state)
+    {
+        case FISH_STATE_INIT: {
+            fish->state = FISH_STATE_WANDER_PICK_POINT;
+        } break;
+
+        case FISH_STATE_WANDER_PICK_POINT: {
+            int width, height;
+            SDL_GetWindowSize(app->window, &width, &height);
+
+            fish->wander_target_x = rand() % width;
+            fish->wander_target_y = rand() % height;
+            fish->wander_start_x = fish->x;
+            fish->wander_start_y = fish->y;
+            fish->wander_step = 0.1;
+            fish->state = FISH_STATE_WANDER_TRANSITION;
+        } break;
+
+        case FISH_STATE_WANDER_TRANSITION: {
+            if (fish->x != fish->wander_target_x) {
+                fish->x = lerp(fish->wander_start_x, fish->wander_target_x, fish->wander_step);
+            }
+            if (fish->y != fish->wander_target_y) {
+                fish->y = lerp(fish->wander_start_y, fish->wander_target_y, fish->wander_step);
+            }
+            if (fish->wander_step >= 1.0) {
+                fish->state = FISH_STATE_WANDER_DONE;
+            }
+            fish->wander_step += 0.05 * delta_time;
+        } break;
+
+        case FISH_STATE_WANDER_DONE: {
+            fish->state = FISH_STATE_INIT;
+        } break;
+
+        case FISH_STATE_NONE: /* through */
+        default:
+            break;
+    }
+
+}
+
+void fish_draw(const struct app *app, const struct fish *fish)
+{
+    SDL_Rect rect = {
+        .x = fish->x,
+        .y = fish->y,
+        .w = fish->w,
+        .h = fish->h
+    };
+    SDL_Texture *texture = fish->type == FISH_TYPE_ANGRY ? app->angry_fish_texture : app->fish_texture;
+    SDL_RenderCopy(app->renderer, texture, NULL, &rect);
+}
+
+struct app *app_new()
+{
+    struct app *app = malloc(sizeof(struct app));
+
+    scc(SDL_Init(SDL_INIT_VIDEO));
+    scc(SDL_CreateWindowAndRenderer(320, 240, SDL_WINDOW_RESIZABLE, &app->window, &app->renderer));
+    app->fish_texture = scp(IMG_LoadTexture(app->renderer, "./assets/fish/fish.png"));
+    app->angry_fish_texture = scp(IMG_LoadTexture(app->renderer, "./assets/fish/angryfish.png"));
+    fishes_add(app, 20, 20, 128, 128, FISH_TYPE_NORMAL);
+    fishes_add(app, 20, 150, 128, 128, FISH_TYPE_NORMAL);
+    fishes_add(app, 150, 150, 128, 128, FISH_TYPE_ANGRY);
+
+    return app;
+}
+
+void app_update(struct app *app, float delta_time)
+{
+    /* fishes */
+    {
+        int found_fishes = 0;
+        for (int i = 0; i < FISHES_MAX; i++) {
+            if (app->fishes[i] != NULL) {
+                found_fishes++;
+                fish_update(app, app->fishes[i], delta_time);
+            }
+            if (found_fishes >= app->fishes_count) {
+                break;
+            }
+        }
+    }
+}
+
+void app_draw(struct app *app)
+{
+    /* background */
+    {
+        SDL_SetRenderDrawColor(app->renderer, 0x11, 0x65, 0xBA, 0xff);
+        SDL_RenderClear(app->renderer);
+    }
+
+    /* fishes */
+    {
+        int found_fishes = 0;
+        for (int i = 0; i < FISHES_MAX; i++) {
+            if (app->fishes[i] != NULL) {
+                found_fishes++;
+                fish_draw(app, app->fishes[i]);
+            }
+            if (found_fishes >= app->fishes_count) {
+                break;
+            }
+        }
+    }
+}
+
+void app_loop(struct app *app) {
+    SDL_Event event;
+    Uint32 prev_ticks = SDL_GetTicks();
+    float lag_sec = 0;
+    while (1) {
+        Uint32 current_ticks = SDL_GetTicks();
+        lag_sec += (float) (current_ticks - prev_ticks) / 1000.0f;
+        SDL_PollEvent(&event);
+        if (event.type == SDL_QUIT) {
+            break;
+        }
+
+        {
+            SDL_Delay(1);
+            while (lag_sec >= SIMULATION_DELTA_TIME) {
+                app_update(app, SIMULATION_DELTA_TIME);
+                lag_sec -= SIMULATION_DELTA_TIME;
+            }
+        }
+
+        app_draw(app);
+
+        SDL_RenderPresent(app->renderer);
+    }
+}
+
+void app_free(struct app *app)
+{
+    int found_fishes = 0;
+    for (int i = 0; i < FISHES_MAX; i++) {
+        if (app->fishes[i] != NULL) {
+            free(app->fishes[i]);
+            found_fishes++;
+        }
+        if (found_fishes >= app->fishes_count) {
+            break;
+        }
+    }
+    SDL_DestroyRenderer(app->renderer);
+    SDL_DestroyWindow(app->window);
+    SDL_DestroyTexture(app->fish_texture);
+    free(app);
+}
+
+int main(int argc, char *argv[])
+{
+    struct app *app = app_new();
+    app_loop(app);
+    app_free(app);
+
+    SDL_Quit();
+
+    return 0;
+}

src/main.cpp

@@ -1,47 +0,0 @@
-#include "SDL.h"
-
-void scc(int code)
-{
-    if (code < 0) {
-        fprintf(stderr, "SDL ERROR: %s\n", SDL_GetError());
-        exit(1);
-    }
-}
-
-void *scp(void *ptr)
-{
-    if (ptr == NULL) {
-        fprintf(stderr, "SDL ERROR: %s\n", SDL_GetError());
-        exit(1);
-    }
-
-    return ptr;
-}
-
-int main(int argc, char *argv[])
-{
-    SDL_Window *window;
-    SDL_Renderer *renderer;
-    SDL_Surface *surface;
-    SDL_Event event;
-
-    scc(SDL_Init(SDL_INIT_VIDEO));
-    scc(SDL_CreateWindowAndRenderer(320, 240, SDL_WINDOW_RESIZABLE, &window, &renderer));
-
-    while (1) {
-        SDL_PollEvent(&event);
-        if (event.type == SDL_QUIT) {
-            break;
-        }
-        SDL_SetRenderDrawColor(renderer, 0x00, 0x00, 0x00, 0x00);
-        SDL_RenderClear(renderer);
-        SDL_RenderPresent(renderer);
-    }
-
-    SDL_DestroyRenderer(renderer);
-    SDL_DestroyWindow(window);
-
-    SDL_Quit();
-
-    return 0;
-}