diff options
Diffstat (limited to 'sdl3_main.c')
| -rw-r--r-- | sdl3_main.c | 265 |
1 files changed, 265 insertions, 0 deletions
diff --git a/sdl3_main.c b/sdl3_main.c new file mode 100644 index 0000000..1a20d15 --- /dev/null +++ b/sdl3_main.c @@ -0,0 +1,265 @@ +#include <SDL3/SDL_rect.h> +#include <math.h> +#include <stdbool.h> +#include <stdio.h> +#include <stdlib.h> + +#include <SDL3/SDL.h> + +static void render(void); +static void update(float delta); +static void process_events(void); + +typedef struct { + float x, y; +} Player; + +typedef struct { + float x, y; + float vx, vy; + bool active; +} Ghost; + +typedef struct { + float x, y; + float vx, vy; + float time; + bool active; +} Bullet; + +static SDL_Window *window; +static SDL_Renderer *renderer; +static bool running; +static Uint64 old_ticks, new_ticks; + +static Player player; +static Ghost ghosts[1024]; +static Bullet bullet[1024]; + +static bool shot; +static int shotx, shoty; + +int +main() +{ + if(!SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO)) { + fprintf(stderr, "SDL_Init(): %s\n", SDL_GetError()); + return 1; + } + + if(!SDL_CreateWindowAndRenderer("window", 800, 600, SDL_WINDOW_OPENGL, &window, &renderer)) { + fprintf(stderr, "SDL_CreateWindowAndRenderer: %s\n", SDL_GetError()); + return -1; + } + + for(int i = 0; i < 10; i++) { + ghosts[i].active = 1; + ghosts[i].x = rand() % 800; + ghosts[i].y = rand() % 600; + } + + running = true; + old_ticks = SDL_GetTicksNS(); + while(running) { + double delta; + process_events(); + + new_ticks = SDL_GetTicksNS(); + delta = (new_ticks - old_ticks) / 1000000000.0; + old_ticks = new_ticks; + update(delta); + + render(); + SDL_RenderPresent(renderer); + } + + SDL_DestroyWindow(window); + SDL_Quit(); + return 0; +} + +void +render(void) +{ + SDL_SetRenderDrawColor(renderer, 0x00, 0x00, 0x00, 0xFF); + SDL_RenderClear(renderer); + + SDL_SetRenderDrawColor(renderer, 0xFF, 0xFF, 0xFF, 0xFF); + SDL_RenderRect(renderer, &(SDL_FRect){ + .x = player.x - 15, + .y = player.y - 15, + .w = 30, + .h = 30 + }); + + for(int i = 0; i < 1024; i++) { + if(!ghosts[i].active) + continue; + + SDL_SetRenderDrawColor(renderer, 0xAA, 0xAA, 0xAA, 0xFF); + SDL_RenderRect(renderer, &(SDL_FRect){ + .x = ghosts[i].x - 15, + .y = ghosts[i].y - 15, + .w = 30, + .h = 30 + }); + } + + for(int i = 0; i < 1024; i++) { + if(!bullet[i].active) + continue; + + SDL_SetRenderDrawColor(renderer, 0xFF, 0xFF, 0x00, 0xFF); + SDL_RenderRect(renderer, &(SDL_FRect){ + .x = bullet[i].x - 2, + .y = bullet[i].y - 2, + .w = 4, + .h = 4 + }); + } +} + +void +update(float delta) +{ +# define SPEED 100 + const _Bool *kstate = SDL_GetKeyboardState(NULL); + + if(kstate[SDL_SCANCODE_W]) + player.y -= delta * SPEED; + if(kstate[SDL_SCANCODE_A]) + player.x -= delta * SPEED; + if(kstate[SDL_SCANCODE_S]) + player.y += delta * SPEED; + if(kstate[SDL_SCANCODE_D]) + player.x += delta * SPEED; + + if(shot) { + shot = false; + int i; + + float dx = shotx - player.x; + float dy = shoty - player.y; + float dd = sqrtf(dx * dx + dy * dy); + + dx /= dd; + dy /= dd; + + for(i = 0; i < 1024 && bullet[i].active; i++) + ; + + if(i < 1024) { + bullet[i].time = 0.5; + bullet[i].vx = dx * SPEED * 5.0; + bullet[i].vy = dy * SPEED * 5.0; + bullet[i].x = player.x; + bullet[i].y = player.y; + bullet[i].active = true; + } + } + + for(int i = 0; i < 1024; i++) { + if(!bullet[i].active) + continue; + + for(int j = 0; j < 1024; j++) { + if(!ghosts[j].active) + continue; + + float dx = bullet[i].x - ghosts[j].x; + float dy = bullet[i].y - ghosts[j].y; + + float minx = dx - 17; + float miny = dy - 17; + float maxx = dx + 17; + float maxy = dy + 17; + + bool contains_x = minx < 0 && maxx > 0; + bool contains_y = miny < 0 && maxy > 0; + + if(contains_x && contains_y) { + ghosts[j].active = false; + bullet[i].active = false; + } + } + } + + for(int i = 0; i < 1024; i++) { + if(!ghosts[i].active) + continue; + + float vx = 0, vy = 0; + + float dx = player.x - ghosts[i].x; + float dy = player.y - ghosts[i].y; + float dd = sqrtf(dx * dx + dy * dy); + + dx /= dd; + dy /= dd; + + vx += dx * SPEED; + vy += dy * SPEED; + + for(int j = 0; j < 1024; j++) { + if(!ghosts[j].active || i == j) + continue; + + float dx = ghosts[j].x - ghosts[i].x; + float dy = ghosts[j].y - ghosts[i].y; + float dd = sqrtf(dx * dx + dy * dy); + + dx /= dd; + dy /= dd; + + if(dd < 40) { + vx -= dx * 100; + vy -= dy * 100; + } + } + + ghosts[i].vx = vx; + ghosts[i].vy = vy; + } + + for(int i = 0; i < 1024; i++) { + if(!ghosts[i].active) + continue; + + ghosts[i].x += ghosts[i].vx * delta; + ghosts[i].y += ghosts[i].vy * delta; + } + + for(int i = 0; i < 1024; i++) { + if(!bullet[i].active) + continue; + + bullet[i].time -= delta; + if(bullet[i].time <= 0.0) { + bullet[i].active = false; + continue; + } + + bullet[i].x += delta * bullet[i].vx; + bullet[i].y += delta * bullet[i].vy; + } +} +void +process_events() +{ + SDL_Event event; + + while(SDL_PollEvent(&event)) { + switch(event.type) { + case SDL_EVENT_QUIT: + running = false; + break; + case SDL_EVENT_MOUSE_BUTTON_DOWN: + shot = true; + shotx = event.button.x; + shoty = event.button.y; + break; + } + } +} + + |