Created
July 7, 2024 17:04
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SDL3 window app in one file
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| /* | |
| TO COMPILE : | |
| HAVE SDL3 installed in /usr/local/lib | |
| gcc -Wall myapp_sdl3.c -L /usr/local/lib/ -lSDL3 -o output | |
| PUBLIC DOMAIN | |
| */ | |
| #define SDL_MAIN_USE_CALLBACKS | |
| #include <SDL3/SDL_main.h> | |
| #include <SDL3/SDL.h> | |
| #include <SDL3/SDL_timer.h> | |
| #include <SDL3/SDL_render.h> | |
| #include <stdio.h> | |
| #include <stdlib.h> | |
| typedef struct ContextApp { | |
| SDL_Window* window; | |
| SDL_Surface* surface; | |
| int err; | |
| unsigned long nbEvenements; | |
| } Ctx; | |
| // la couleur du contenu de la fenêtre par défaut | |
| const SDL_Color color = {255, 255, 0}; | |
| void MyApp_HandleError(const char* caller) { | |
| printf("[%s] error %s\n", caller, SDL_GetError()); | |
| } | |
| void MyApp_FreeContextApp(Ctx* ctx) { | |
| if (!ctx) return; | |
| if (ctx->window != NULL) { | |
| int *w = malloc(sizeof(int)), *h = malloc(sizeof(int)); | |
| int err = SDL_GetWindowSize(ctx->window, w, h); | |
| if (err != 0) { | |
| MyApp_HandleError("SDL_GetWindowSize"); | |
| } else { | |
| printf("MA WINDOW FAIT %d*%d\n", *w, *h); | |
| } | |
| free(w); | |
| free(h); | |
| } | |
| SDL_DestroyWindow(ctx->window); | |
| free(ctx); | |
| } | |
| int MyApp_UpdateSurfaceColor(Ctx* ctx) { | |
| ctx->surface = SDL_GetWindowSurface(ctx->window); | |
| int err = SDL_FillSurfaceRect(ctx->surface, NULL, SDL_MapRGB( ctx->surface->format, color.r, color.g, color.b)); | |
| if (err != 0) { | |
| MyApp_HandleError("SDL_FillSurfaceRect"); | |
| return SDL_EVENT_QUIT; | |
| } | |
| err = SDL_UpdateWindowSurface(ctx->window); | |
| if (err != 0) { | |
| MyApp_HandleError("SDL_UpdateWindowSurface"); | |
| return SDL_EVENT_QUIT; | |
| } | |
| return 0; | |
| } | |
| // Initialisation de notre application | |
| int SDL_AppInit(void **appstate, int argc, char **argv) { | |
| Ctx* ctx = malloc(sizeof(Ctx)); | |
| if (!ctx) { | |
| printf("malloc returned null"); | |
| return SDL_EVENT_QUIT; | |
| } | |
| ctx->nbEvenements = 0; | |
| // on affecte l'état de l'application avec notre structure qui reflète le contexte d'application | |
| *appstate = ctx; | |
| ctx->window = SDL_CreateWindow("MA FENETRE", 400, 200, SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE); | |
| if (!ctx->window) { | |
| MyApp_HandleError("SDL_CreateWindow"); | |
| return SDL_EVENT_QUIT; | |
| } | |
| MyApp_UpdateSurfaceColor(ctx); | |
| return 0; | |
| } | |
| // Boucle infinie | |
| int SDL_AppIterate(void *appstate) { | |
| Ctx* ctx = appstate; | |
| int state = MyApp_UpdateSurfaceColor(ctx); | |
| // avoir un Délai pour ne pas surcharger le CPU | |
| SDL_Delay(60); | |
| return state; | |
| } | |
| // déclenchement d'un événement | |
| int SDL_AppEvent(void *appstate, const SDL_Event *event) { | |
| // NE PAS SUPPRIMER LE HANDLE DE L'ÉVÉNEMENT SDL_EVENT_QUIT | |
| if (event->type == SDL_EVENT_QUIT || (event->type == SDL_EVENT_KEY_DOWN && event->key.key == SDLK_Q)) { | |
| return SDL_EVENT_QUIT; | |
| } | |
| Ctx* ctx = appstate; | |
| ctx->nbEvenements++; | |
| printf("\r%ld événements se sont produits", ctx->nbEvenements); | |
| return 0; | |
| } | |
| // Quand l'application doit être terminée | |
| void SDL_AppQuit(void *appstate) { | |
| printf("\nSQL_QUIT : ON FREE NOTRE CONTEXTE D'APPLICATION\n"); | |
| Ctx* context_to_free = appstate; | |
| MyApp_FreeContextApp(context_to_free); | |
| } |
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