From 60857935ca32246b15a8c5ebb9c3f26c837bc369 Mon Sep 17 00:00:00 2001
From: DamianS-eng <[EMAIL REDACTED]>
Date: Fri, 14 Mar 2025 17:06:47 -0400
Subject: [PATCH] Add preliminary joystick support for snake example
---
examples/demo/01-snake/snake.c | 45 ++++++++++++++++++++++++++++++++--
1 file changed, 43 insertions(+), 2 deletions(-)
diff --git a/examples/demo/01-snake/snake.c b/examples/demo/01-snake/snake.c
index 0aca862d7505e..8c3f4889394bb 100644
--- a/examples/demo/01-snake/snake.c
+++ b/examples/demo/01-snake/snake.c
@@ -21,6 +21,9 @@
#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)
+static SDL_Joystick *joystick = NULL;
+
+
typedef enum
{
SNAKE_CELL_NOTHING = 0U,
@@ -238,6 +241,26 @@ static SDL_AppResult handle_key_event_(SnakeContext *ctx, SDL_Scancode key_code)
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)
{
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;
}
@@ -316,7 +340,7 @@ SDL_AppResult SDL_AppInit(void **appstate, int argc, char *argv[])
*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;
}
@@ -333,6 +357,20 @@ SDL_AppResult SDL_AppEvent(void *appstate, SDL_Event *event)
switch (event->type) {
case SDL_EVENT_QUIT:
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:
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)
{
+ if (joystick) {
+ SDL_CloseJoystick(joystick);
+ }
if (appstate != NULL) {
AppState *as = (AppState *)appstate;
SDL_DestroyRenderer(as->renderer);