| /* |
| Simple DirectMedia Layer |
| Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org> |
| |
| This software is provided 'as-is', without any express or implied |
| warranty. In no event will the authors be held liable for any damages |
| arising from the use of this software. |
| |
| Permission is granted to anyone to use this software for any purpose, |
| including commercial applications, and to alter it and redistribute it |
| freely, subject to the following restrictions: |
| |
| 1. The origin of this software must not be misrepresented; you must not |
| claim that you wrote the original software. If you use this software |
| in a product, an acknowledgment in the product documentation would be |
| appreciated but is not required. |
| 2. Altered source versions must be plainly marked as such, and must not be |
| misrepresented as being the original software. |
| 3. This notice may not be removed or altered from any source distribution. |
| */ |
| #include "../../SDL_internal.h" |
| |
| #ifdef SDL_JOYSTICK_HIDAPI |
| |
| /* Handle rumble on a separate thread so it doesn't block the application */ |
| |
| #include "SDL_assert.h" |
| #include "SDL_thread.h" |
| #include "SDL_hidapijoystick_c.h" |
| #include "SDL_hidapi_rumble.h" |
| |
| |
| typedef struct SDL_HIDAPI_RumbleRequest |
| { |
| SDL_HIDAPI_Device *device; |
| Uint8 data[USB_PACKET_LENGTH]; |
| int size; |
| struct SDL_HIDAPI_RumbleRequest *prev; |
| |
| } SDL_HIDAPI_RumbleRequest; |
| |
| typedef struct SDL_HIDAPI_RumbleContext |
| { |
| volatile SDL_bool running; |
| SDL_Thread *thread; |
| SDL_mutex *lock; |
| SDL_sem *request_sem; |
| SDL_HIDAPI_RumbleRequest *requests_head; |
| SDL_HIDAPI_RumbleRequest *requests_tail; |
| } SDL_HIDAPI_RumbleContext; |
| |
| static SDL_HIDAPI_RumbleContext rumble_context; |
| |
| static int SDL_HIDAPI_RumbleThread(void *data) |
| { |
| SDL_HIDAPI_RumbleContext *ctx = (SDL_HIDAPI_RumbleContext *)data; |
| |
| SDL_SetThreadPriority(SDL_THREAD_PRIORITY_HIGH); |
| |
| while (ctx->running) { |
| SDL_HIDAPI_RumbleRequest *request = NULL; |
| |
| SDL_SemWait(ctx->request_sem); |
| |
| SDL_LockMutex(ctx->lock); |
| request = ctx->requests_tail; |
| if (request) { |
| if (request == ctx->requests_head) { |
| ctx->requests_head = NULL; |
| } |
| ctx->requests_tail = request->prev; |
| } |
| SDL_UnlockMutex(ctx->lock); |
| |
| if (request) { |
| SDL_LockMutex(request->device->dev_lock); |
| hid_write(request->device->dev, request->data, request->size); |
| SDL_UnlockMutex(request->device->dev_lock); |
| (void)SDL_AtomicDecRef(&request->device->rumble_pending); |
| SDL_free(request); |
| } |
| } |
| return 0; |
| } |
| |
| static void |
| SDL_HIDAPI_StopRumbleThread(SDL_HIDAPI_RumbleContext *ctx) |
| { |
| ctx->running = SDL_FALSE; |
| |
| if (ctx->thread) { |
| int result; |
| |
| SDL_SemPost(ctx->request_sem); |
| SDL_WaitThread(ctx->thread, &result); |
| ctx->thread = NULL; |
| } |
| |
| /* This should always be called with an empty queue */ |
| SDL_assert(!ctx->requests_head); |
| SDL_assert(!ctx->requests_tail); |
| |
| if (ctx->request_sem) { |
| SDL_DestroySemaphore(ctx->request_sem); |
| ctx->request_sem = NULL; |
| } |
| |
| if (ctx->lock) { |
| SDL_DestroyMutex(ctx->lock); |
| ctx->lock = NULL; |
| } |
| } |
| |
| static int |
| SDL_HIDAPI_StartRumbleThread(SDL_HIDAPI_RumbleContext *ctx) |
| { |
| ctx->lock = SDL_CreateMutex(); |
| if (!ctx->lock) { |
| SDL_HIDAPI_StopRumbleThread(ctx); |
| return -1; |
| } |
| |
| ctx->request_sem = SDL_CreateSemaphore(0); |
| if (!ctx->request_sem) { |
| SDL_HIDAPI_StopRumbleThread(ctx); |
| return -1; |
| } |
| |
| ctx->running = SDL_TRUE; |
| ctx->thread = SDL_CreateThread(SDL_HIDAPI_RumbleThread, "HIDAPI Rumble", ctx); |
| if (!ctx->thread) { |
| SDL_HIDAPI_StopRumbleThread(ctx); |
| return -1; |
| } |
| return 0; |
| } |
| |
| int SDL_HIDAPI_SendRumble(SDL_HIDAPI_Device *device, const Uint8 *data, int size) |
| { |
| SDL_HIDAPI_RumbleContext *ctx = &rumble_context; |
| SDL_HIDAPI_RumbleRequest *request; |
| |
| if (size > sizeof(request->data)) { |
| return SDL_SetError("Couldn't send rumble, size %d is greater than %d", size, sizeof(request->data)); |
| } |
| |
| if (!ctx->running) { |
| if (SDL_HIDAPI_StartRumbleThread(ctx) < 0) { |
| return -1; |
| } |
| } |
| |
| request = (SDL_HIDAPI_RumbleRequest *)SDL_calloc(1, sizeof(*request)); |
| if (!request) { |
| return SDL_OutOfMemory(); |
| } |
| request->device = device; |
| SDL_memcpy(request->data, data, size); |
| request->size = size; |
| |
| SDL_AtomicIncRef(&device->rumble_pending); |
| |
| SDL_LockMutex(ctx->lock); |
| if (ctx->requests_head) { |
| ctx->requests_head->prev = request; |
| } else { |
| ctx->requests_tail = request; |
| } |
| ctx->requests_head = request; |
| SDL_UnlockMutex(ctx->lock); |
| |
| SDL_SemPost(ctx->request_sem); |
| |
| return size; |
| } |
| |
| void SDL_HIDAPI_QuitRumble() |
| { |
| SDL_HIDAPI_RumbleContext *ctx = &rumble_context; |
| |
| if (ctx->running) { |
| SDL_HIDAPI_StopRumbleThread(ctx); |
| } |
| } |
| |
| #endif /* SDL_JOYSTICK_HIDAPI */ |
| |
| /* vi: set ts=4 sw=4 expandtab: */ |