Atlas - SDL_hidapi_rumble.c
Home / ext / SDL / src / joystick / hidapi Lines: 1 | Size: 8370 bytes [Download] [Show on GitHub] [Search similar files] [Raw] [Raw (proxy)][FILE BEGIN]1/* 2 Simple DirectMedia Layer 3 Copyright (C) 1997-2025 Sam Lantinga <[email protected]> 4 5 This software is provided 'as-is', without any express or implied 6 warranty. In no event will the authors be held liable for any damages 7 arising from the use of this software. 8 9 Permission is granted to anyone to use this software for any purpose, 10 including commercial applications, and to alter it and redistribute it 11 freely, subject to the following restrictions: 12 13 1. The origin of this software must not be misrepresented; you must not 14 claim that you wrote the original software. If you use this software 15 in a product, an acknowledgment in the product documentation would be 16 appreciated but is not required. 17 2. Altered source versions must be plainly marked as such, and must not be 18 misrepresented as being the original software. 19 3. This notice may not be removed or altered from any source distribution. 20*/ 21#include "SDL_internal.h" 22 23#ifdef SDL_JOYSTICK_HIDAPI 24 25// Handle rumble on a separate thread so it doesn't block the application 26 27#include "SDL_hidapijoystick_c.h" 28#include "SDL_hidapi_rumble.h" 29#include "../../thread/SDL_systhread.h" 30 31typedef struct SDL_HIDAPI_RumbleRequest 32{ 33 SDL_HIDAPI_Device *device; 34 Uint8 data[2 * USB_PACKET_LENGTH]; // need enough space for the biggest report: dualshock4 is 78 bytes 35 int size; 36 SDL_HIDAPI_RumbleSentCallback callback; 37 void *userdata; 38 struct SDL_HIDAPI_RumbleRequest *prev; 39 40} SDL_HIDAPI_RumbleRequest; 41 42typedef struct SDL_HIDAPI_RumbleContext 43{ 44 SDL_AtomicInt initialized; 45 SDL_AtomicInt running; 46 SDL_Thread *thread; 47 SDL_Semaphore *request_sem; 48 SDL_HIDAPI_RumbleRequest *requests_head; 49 SDL_HIDAPI_RumbleRequest *requests_tail; 50} SDL_HIDAPI_RumbleContext; 51 52#ifndef SDL_THREAD_SAFETY_ANALYSIS 53static 54#endif 55SDL_Mutex *SDL_HIDAPI_rumble_lock; 56static SDL_HIDAPI_RumbleContext rumble_context SDL_GUARDED_BY(SDL_HIDAPI_rumble_lock); 57 58static int SDLCALL SDL_HIDAPI_RumbleThread(void *data) 59{ 60 SDL_HIDAPI_RumbleContext *ctx = (SDL_HIDAPI_RumbleContext *)data; 61 62 SDL_SetCurrentThreadPriority(SDL_THREAD_PRIORITY_HIGH); 63 64 while (SDL_GetAtomicInt(&ctx->running)) { 65 SDL_HIDAPI_RumbleRequest *request = NULL; 66 67 SDL_WaitSemaphore(ctx->request_sem); 68 69 SDL_LockMutex(SDL_HIDAPI_rumble_lock); 70 request = ctx->requests_tail; 71 if (request) { 72 if (request == ctx->requests_head) { 73 ctx->requests_head = NULL; 74 } 75 ctx->requests_tail = request->prev; 76 } 77 SDL_UnlockMutex(SDL_HIDAPI_rumble_lock); 78 79 if (request) { 80 SDL_LockMutex(request->device->dev_lock); 81 if (request->device->dev) { 82#ifdef DEBUG_RUMBLE 83 HIDAPI_DumpPacket("Rumble packet: size = %d", request->data, request->size); 84#endif 85 SDL_hid_write(request->device->dev, request->data, request->size); 86 } 87 SDL_UnlockMutex(request->device->dev_lock); 88 if (request->callback) { 89 request->callback(request->userdata); 90 } 91 (void)SDL_AtomicDecRef(&request->device->rumble_pending); 92 SDL_free(request); 93 94 // Make sure we're not starving report reads when there's lots of rumble 95 SDL_Delay(10); 96 } 97 } 98 return 0; 99} 100 101static void SDL_HIDAPI_StopRumbleThread(SDL_HIDAPI_RumbleContext *ctx) 102{ 103 SDL_HIDAPI_RumbleRequest *request; 104 105 SDL_SetAtomicInt(&ctx->running, false); 106 107 if (ctx->thread) { 108 int result; 109 110 SDL_SignalSemaphore(ctx->request_sem); 111 SDL_WaitThread(ctx->thread, &result); 112 ctx->thread = NULL; 113 } 114 115 SDL_LockMutex(SDL_HIDAPI_rumble_lock); 116 while (ctx->requests_tail) { 117 request = ctx->requests_tail; 118 if (request == ctx->requests_head) { 119 ctx->requests_head = NULL; 120 } 121 ctx->requests_tail = request->prev; 122 123 if (request->callback) { 124 request->callback(request->userdata); 125 } 126 (void)SDL_AtomicDecRef(&request->device->rumble_pending); 127 SDL_free(request); 128 } 129 SDL_UnlockMutex(SDL_HIDAPI_rumble_lock); 130 131 if (ctx->request_sem) { 132 SDL_DestroySemaphore(ctx->request_sem); 133 ctx->request_sem = NULL; 134 } 135 136 if (SDL_HIDAPI_rumble_lock) { 137 SDL_DestroyMutex(SDL_HIDAPI_rumble_lock); 138 SDL_HIDAPI_rumble_lock = NULL; 139 } 140 141 SDL_SetAtomicInt(&ctx->initialized, false); 142} 143 144static bool SDL_HIDAPI_StartRumbleThread(SDL_HIDAPI_RumbleContext *ctx) 145{ 146 SDL_HIDAPI_rumble_lock = SDL_CreateMutex(); 147 if (!SDL_HIDAPI_rumble_lock) { 148 SDL_HIDAPI_StopRumbleThread(ctx); 149 return false; 150 } 151 152 ctx->request_sem = SDL_CreateSemaphore(0); 153 if (!ctx->request_sem) { 154 SDL_HIDAPI_StopRumbleThread(ctx); 155 return false; 156 } 157 158 SDL_SetAtomicInt(&ctx->running, true); 159 ctx->thread = SDL_CreateThread(SDL_HIDAPI_RumbleThread, "HIDAPI Rumble", ctx); 160 if (!ctx->thread) { 161 SDL_HIDAPI_StopRumbleThread(ctx); 162 return false; 163 } 164 return true; 165} 166 167bool SDL_HIDAPI_LockRumble(void) 168{ 169 SDL_HIDAPI_RumbleContext *ctx = &rumble_context; 170 171 if (SDL_CompareAndSwapAtomicInt(&ctx->initialized, false, true)) { 172 if (!SDL_HIDAPI_StartRumbleThread(ctx)) { 173 return false; 174 } 175 } 176 177 SDL_LockMutex(SDL_HIDAPI_rumble_lock); 178 return true; 179} 180 181bool SDL_HIDAPI_GetPendingRumbleLocked(SDL_HIDAPI_Device *device, Uint8 **data, int **size, int *maximum_size) 182{ 183 SDL_HIDAPI_RumbleContext *ctx = &rumble_context; 184 SDL_HIDAPI_RumbleRequest *request, *found; 185 186 found = NULL; 187 for (request = ctx->requests_tail; request; request = request->prev) { 188 if (request->device == device) { 189 found = request; 190 } 191 } 192 if (found) { 193 *data = found->data; 194 *size = &found->size; 195 *maximum_size = sizeof(found->data); 196 return true; 197 } 198 return false; 199} 200 201int SDL_HIDAPI_SendRumbleAndUnlock(SDL_HIDAPI_Device *device, const Uint8 *data, int size) 202{ 203 return SDL_HIDAPI_SendRumbleWithCallbackAndUnlock(device, data, size, NULL, NULL); 204} 205 206int SDL_HIDAPI_SendRumbleWithCallbackAndUnlock(SDL_HIDAPI_Device *device, const Uint8 *data, int size, SDL_HIDAPI_RumbleSentCallback callback, void *userdata) 207{ 208 SDL_HIDAPI_RumbleContext *ctx = &rumble_context; 209 SDL_HIDAPI_RumbleRequest *request; 210 211 if (size > sizeof(request->data)) { 212 SDL_HIDAPI_UnlockRumble(); 213 SDL_SetError("Couldn't send rumble, size %d is greater than %d", size, (int)sizeof(request->data)); 214 return -1; 215 } 216 217 request = (SDL_HIDAPI_RumbleRequest *)SDL_calloc(1, sizeof(*request)); 218 if (!request) { 219 SDL_HIDAPI_UnlockRumble(); 220 return -1; 221 } 222 request->device = device; 223 SDL_memcpy(request->data, data, size); 224 request->size = size; 225 request->callback = callback; 226 request->userdata = userdata; 227 228 SDL_AtomicIncRef(&device->rumble_pending); 229 230 if (ctx->requests_head) { 231 ctx->requests_head->prev = request; 232 } else { 233 ctx->requests_tail = request; 234 } 235 ctx->requests_head = request; 236 237 // Make sure we unlock before posting the semaphore so the rumble thread can run immediately 238 SDL_HIDAPI_UnlockRumble(); 239 240 SDL_SignalSemaphore(ctx->request_sem); 241 242 return size; 243} 244 245void SDL_HIDAPI_UnlockRumble(void) 246{ 247 SDL_UnlockMutex(SDL_HIDAPI_rumble_lock); 248} 249 250int SDL_HIDAPI_SendRumble(SDL_HIDAPI_Device *device, const Uint8 *data, int size) 251{ 252 Uint8 *pending_data; 253 int *pending_size; 254 int maximum_size; 255 256 if (size <= 0) { 257 SDL_SetError("Tried to send rumble with invalid size"); 258 return -1; 259 } 260 261 if (!SDL_HIDAPI_LockRumble()) { 262 return -1; 263 } 264 265 // check if there is a pending request for the device and update it 266 if (SDL_HIDAPI_GetPendingRumbleLocked(device, &pending_data, &pending_size, &maximum_size) && 267 size == *pending_size && data[0] == pending_data[0]) { 268 SDL_memcpy(pending_data, data, size); 269 SDL_HIDAPI_UnlockRumble(); 270 return size; 271 } 272 273 return SDL_HIDAPI_SendRumbleAndUnlock(device, data, size); 274} 275 276void SDL_HIDAPI_QuitRumble(void) 277{ 278 SDL_HIDAPI_RumbleContext *ctx = &rumble_context; 279 280 if (SDL_GetAtomicInt(&ctx->running)) { 281 SDL_HIDAPI_StopRumbleThread(ctx); 282 } 283} 284 285#endif // SDL_JOYSTICK_HIDAPI 286[FILE END](C) 2025 0x4248 (C) 2025 4248 Media and 4248 Systems, All part of 0x4248 See LICENCE files for more information. 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