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Add preliminary joystick support for snake example

This commit is contained in:
DamianS-eng 2025-03-14 17:06:47 -04:00 committed by Sam Lantinga
parent aad1e35162
commit 60857935ca
1 changed files with 43 additions and 2 deletions
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45
examples/demo/01-snake/snake.c
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@ -21,6 +21,9 @@
#define THREE_BITS 0x7U /* ~CHAR_MAX >> (CHAR_BIT - SNAKE_CELL_MAX_BITS) */ #define THREE_BITS 0x7U /* ~CHAR_MAX >> (CHAR_BIT - SNAKE_CELL_MAX_BITS) */
#define SHIFT(x, y) (((x) + ((y) * SNAKE_GAME_WIDTH)) * SNAKE_CELL_MAX_BITS) #define SHIFT(x, y) (((x) + ((y) * SNAKE_GAME_WIDTH)) * SNAKE_CELL_MAX_BITS)
static SDL_Joystick *joystick = NULL;
typedef enum typedef enum
{ {
SNAKE_CELL_NOTHING = 0U, SNAKE_CELL_NOTHING = 0U,
@ -238,6 +241,26 @@ static SDL_AppResult handle_key_event_(SnakeContext *ctx, SDL_Scancode key_code)
return SDL_APP_CONTINUE; return SDL_APP_CONTINUE;
} }
static SDL_AppResult handle_hat_event_(SnakeContext *ctx, Uint8 hat) {
switch (hat) {
case SDL_HAT_RIGHT:
snake_redir(ctx, SNAKE_DIR_RIGHT);
break;
case SDL_HAT_UP:
snake_redir(ctx, SNAKE_DIR_UP);
break;
case SDL_HAT_LEFT:
snake_redir(ctx, SNAKE_DIR_LEFT);
break;
case SDL_HAT_DOWN:
snake_redir(ctx, SNAKE_DIR_DOWN);
break;
default:
break;
}
return SDL_APP_CONTINUE;
}
SDL_AppResult SDL_AppIterate(void *appstate) SDL_AppResult SDL_AppIterate(void *appstate)
{ {
AppState *as = (AppState *)appstate; AppState *as = (AppState *)appstate;
@ -305,7 +328,8 @@ SDL_AppResult SDL_AppInit(void **appstate, int argc, char *argv[])
} }
} }
if (!SDL_Init(SDL_INIT_VIDEO)) { if (!SDL_Init(SDL_INIT_VIDEO | SDL_INIT_JOYSTICK)) {
SDL_Log("Couldn't initialize SDL: %s", SDL_GetError());
return SDL_APP_FAILURE; return SDL_APP_FAILURE;
} }
@ -316,7 +340,7 @@ SDL_AppResult SDL_AppInit(void **appstate, int argc, char *argv[])
*appstate = as; *appstate = as;
if (!SDL_CreateWindowAndRenderer("examples/demo/snake", SDL_WINDOW_WIDTH, SDL_WINDOW_HEIGHT, 0, &as->window, &as->renderer)) { if (!SDL_CreateWindowAndRenderer("examples/snake", SDL_WINDOW_WIDTH, SDL_WINDOW_HEIGHT, 0, &as->window, &as->renderer)) {
return SDL_APP_FAILURE; return SDL_APP_FAILURE;
} }
@ -333,6 +357,20 @@ SDL_AppResult SDL_AppEvent(void *appstate, SDL_Event *event)
switch (event->type) { switch (event->type) {
case SDL_EVENT_QUIT: case SDL_EVENT_QUIT:
return SDL_APP_SUCCESS; return SDL_APP_SUCCESS;
case SDL_EVENT_JOYSTICK_ADDED:
if (joystick == NULL) {
joystick = SDL_OpenJoystick(event->jdevice.which);
if (!joystick) {
SDL_Log("Failed to open joystick ID %u: %s", (unsigned int) event->jdevice.which, SDL_GetError());
}
}
case SDL_EVENT_JOYSTICK_REMOVED:
if (joystick && (SDL_GetJoystickID(joystick) == event->jdevice.which)) {
SDL_CloseJoystick(joystick);
joystick = NULL;
}
case SDL_EVENT_JOYSTICK_HAT_MOTION:
return handle_hat_event_(ctx, event->jhat.value);
case SDL_EVENT_KEY_DOWN: case SDL_EVENT_KEY_DOWN:
return handle_key_event_(ctx, event->key.scancode); return handle_key_event_(ctx, event->key.scancode);
} }
@ -341,6 +379,9 @@ SDL_AppResult SDL_AppEvent(void *appstate, SDL_Event *event)
void SDL_AppQuit(void *appstate, SDL_AppResult result) void SDL_AppQuit(void *appstate, SDL_AppResult result)
{ {
if (joystick) {
SDL_CloseJoystick(joystick);
}
if (appstate != NULL) { if (appstate != NULL) {
AppState *as = (AppState *)appstate; AppState *as = (AppState *)appstate;
SDL_DestroyRenderer(as->renderer); SDL_DestroyRenderer(as->renderer);