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Fixes libsdl-org#1374.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,6 @@ | ||
| This example code loads a few bitmap files from disk using the asynchronous | ||
| i/o, and then draws it to the window. It uses a task group to watch multiple | ||
| reads and deal with them in whatever order they finish. | ||
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| Note that for a single tiny file like this, you'd probably not want to bother | ||
| with async i/o in real life, but this is just an example of how to do it. |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,125 @@ | ||
| /* | ||
| * This example code loads a bitmap with asynchronous i/o and renders it. | ||
| * | ||
| * This code is public domain. Feel free to use it for any purpose! | ||
| */ | ||
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| #define SDL_MAIN_USE_CALLBACKS 1 /* use the callbacks instead of main() */ | ||
| #include <SDL3/SDL.h> | ||
| #include <SDL3/SDL_main.h> | ||
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| /* We will use this renderer to draw into this window every frame. */ | ||
| static SDL_Window *window = NULL; | ||
| static SDL_Renderer *renderer = NULL; | ||
| static SDL_AsyncIOQueue *queue = NULL; | ||
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| #define TOTAL_TEXTURES 4 | ||
| static const char * const bmps[TOTAL_TEXTURES] = { "sample.bmp", "gamepad_front.bmp", "speaker.bmp", "icon2x.bmp" }; | ||
| static SDL_Texture *textures[TOTAL_TEXTURES]; | ||
| static const SDL_FRect texture_rects[TOTAL_TEXTURES] = { | ||
| { 116, 156, 408, 167 }, | ||
| { 20, 200, 96, 60 }, | ||
| { 525, 180, 96, 96 }, | ||
| { 288, 375, 64, 64 } | ||
| }; | ||
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| /* This function runs once at startup. */ | ||
| SDL_AppResult SDL_AppInit(void **appstate, int argc, char *argv[]) | ||
| { | ||
| int i; | ||
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| if (!SDL_Init(SDL_INIT_VIDEO)) { | ||
| SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, "Couldn't initialize SDL!", SDL_GetError(), NULL); | ||
| return SDL_APP_FAILURE; | ||
| } | ||
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| if (!SDL_CreateWindowAndRenderer("examples/asyncio/load-bitmaps", 640, 480, 0, &window, &renderer)) { | ||
| SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, "Couldn't create window/renderer!", SDL_GetError(), NULL); | ||
| return SDL_APP_FAILURE; | ||
| } | ||
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| queue = SDL_CreateAsyncIOQueue(); | ||
| if (!queue) { | ||
| SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, "Couldn't create async i/o queue!", SDL_GetError(), NULL); | ||
| return SDL_APP_FAILURE; | ||
| } | ||
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| /* Load some .bmp files asynchronously from wherever the app is being run from, put them in the same queue. */ | ||
| for (i = 0; i < SDL_arraysize(bmps); i++) { | ||
| char *path = NULL; | ||
| SDL_asprintf(&path, "%s%s", SDL_GetBasePath(), bmps[i]); /* allocate a string of the full file path */ | ||
| /* you _should) check for failure, but we'll just go on without files here. */ | ||
| SDL_LoadFileAsync(path, queue, (void *) bmps[i]); /* attach the filename as app-specific data, so we can see it later. */ | ||
| SDL_free(path); | ||
| } | ||
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| return SDL_APP_CONTINUE; /* carry on with the program! */ | ||
| } | ||
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| /* This function runs when a new event (mouse input, keypresses, etc) occurs. */ | ||
| SDL_AppResult SDL_AppEvent(void *appstate, SDL_Event *event) | ||
| { | ||
| if (event->type == SDL_EVENT_QUIT) { | ||
| return SDL_APP_SUCCESS; /* end the program, reporting success to the OS. */ | ||
| } | ||
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| return SDL_APP_CONTINUE; /* carry on with the program! */ | ||
| } | ||
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| /* This function runs once per frame, and is the heart of the program. */ | ||
| SDL_AppResult SDL_AppIterate(void *appstate) | ||
| { | ||
| SDL_AsyncIOOutcome outcome; | ||
| int i; | ||
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| if (SDL_GetAsyncIOResult(queue, &outcome)) { /* a .bmp file load has finished? */ | ||
| if (outcome.result == SDL_ASYNCIO_COMPLETE) { | ||
| /* this might be _any_ of the bmps; they might finish loading in any order. */ | ||
| for (i = 0; i < SDL_arraysize(bmps); i++) { | ||
| /* this doesn't need a strcmp because we gave the pointer from this array to SDL_LoadFileAsync */ | ||
| if (outcome.userdata == bmps[i]) { | ||
| break; | ||
| } | ||
| } | ||
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| if (i < SDL_arraysize(bmps)) { /* (just in case.) */ | ||
| SDL_Surface *surface = SDL_LoadBMP_IO(SDL_IOFromConstMem(outcome.buffer, (size_t) outcome.bytes_transferred), true); | ||
| if (surface) { /* the renderer is not multithreaded, so create the texture here once the data loads. */ | ||
| textures[i] = SDL_CreateTextureFromSurface(renderer, surface); | ||
| if (!textures[i]) { | ||
| SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, "Couldn't create texture!", SDL_GetError(), NULL); | ||
| return SDL_APP_FAILURE; | ||
| } | ||
| SDL_DestroySurface(surface); | ||
| } | ||
| } | ||
| } | ||
| SDL_free(outcome.buffer); | ||
| } | ||
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| SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255); | ||
| SDL_RenderClear(renderer); | ||
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| for (i = 0; i < SDL_arraysize(textures); i++) { | ||
| SDL_RenderTexture(renderer, textures[i], NULL, &texture_rects[i]); | ||
| } | ||
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| SDL_RenderPresent(renderer); | ||
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| return SDL_APP_CONTINUE; /* carry on with the program! */ | ||
| } | ||
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| /* This function runs once at shutdown. */ | ||
| void SDL_AppQuit(void *appstate, SDL_AppResult result) | ||
| { | ||
| int i; | ||
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| SDL_DestroyAsyncIOQueue(queue); | ||
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| for (i = 0; i < SDL_arraysize(textures); i++) { | ||
| SDL_DestroyTexture(textures[i]); | ||
| } | ||
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| /* SDL will clean up the window/renderer for us. */ | ||
| } | ||
|
|
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