1 files changed, 285 insertions, 0 deletions

diff --git a/contrib/SDL-3.2.8/src/joystick/hidapi/SDL_hidapi_rumble.c b/contrib/SDL-3.2.8/src/joystick/hidapi/SDL_hidapi_rumble.c
new file mode 100644
index 0000000..5fd93dc
--- /dev/null
+++ b/contrib/SDL-3.2.8/src/joystick/hidapi/SDL_hidapi_rumble.c
@@ -0,0 +1,285 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2025 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_hidapijoystick_c.h"
+#include "SDL_hidapi_rumble.h"
+#include "../../thread/SDL_systhread.h"
+
+typedef struct SDL_HIDAPI_RumbleRequest
+{
+    SDL_HIDAPI_Device *device;
+    Uint8 data[2 * USB_PACKET_LENGTH]; // need enough space for the biggest report: dualshock4 is 78 bytes
+    int size;
+    SDL_HIDAPI_RumbleSentCallback callback;
+    void *userdata;
+    struct SDL_HIDAPI_RumbleRequest *prev;
+
+} SDL_HIDAPI_RumbleRequest;
+
+typedef struct SDL_HIDAPI_RumbleContext
+{
+    SDL_AtomicInt initialized;
+    SDL_AtomicInt running;
+    SDL_Thread *thread;
+    SDL_Semaphore *request_sem;
+    SDL_HIDAPI_RumbleRequest *requests_head;
+    SDL_HIDAPI_RumbleRequest *requests_tail;
+} SDL_HIDAPI_RumbleContext;
+
+#ifndef SDL_THREAD_SAFETY_ANALYSIS
+static
+#endif
+SDL_Mutex *SDL_HIDAPI_rumble_lock;
+static SDL_HIDAPI_RumbleContext rumble_context SDL_GUARDED_BY(SDL_HIDAPI_rumble_lock);
+
+static int SDLCALL SDL_HIDAPI_RumbleThread(void *data)
+{
+    SDL_HIDAPI_RumbleContext *ctx = (SDL_HIDAPI_RumbleContext *)data;
+
+    SDL_SetCurrentThreadPriority(SDL_THREAD_PRIORITY_HIGH);
+
+    while (SDL_GetAtomicInt(&ctx->running)) {
+        SDL_HIDAPI_RumbleRequest *request = NULL;
+
+        SDL_WaitSemaphore(ctx->request_sem);
+
+        SDL_LockMutex(SDL_HIDAPI_rumble_lock);
+        request = ctx->requests_tail;
+        if (request) {
+            if (request == ctx->requests_head) {
+                ctx->requests_head = NULL;
+            }
+            ctx->requests_tail = request->prev;
+        }
+        SDL_UnlockMutex(SDL_HIDAPI_rumble_lock);
+
+        if (request) {
+            SDL_LockMutex(request->device->dev_lock);
+            if (request->device->dev) {
+#ifdef DEBUG_RUMBLE
+                HIDAPI_DumpPacket("Rumble packet: size = %d", request->data, request->size);
+#endif
+                SDL_hid_write(request->device->dev, request->data, request->size);
+            }
+            SDL_UnlockMutex(request->device->dev_lock);
+            if (request->callback) {
+                request->callback(request->userdata);
+            }
+            (void)SDL_AtomicDecRef(&request->device->rumble_pending);
+            SDL_free(request);
+
+            // Make sure we're not starving report reads when there's lots of rumble
+            SDL_Delay(10);
+        }
+    }
+    return 0;
+}
+
+static void SDL_HIDAPI_StopRumbleThread(SDL_HIDAPI_RumbleContext *ctx)
+{
+    SDL_HIDAPI_RumbleRequest *request;
+
+    SDL_SetAtomicInt(&ctx->running, false);
+
+    if (ctx->thread) {
+        int result;
+
+        SDL_SignalSemaphore(ctx->request_sem);
+        SDL_WaitThread(ctx->thread, &result);
+        ctx->thread = NULL;
+    }
+
+    SDL_LockMutex(SDL_HIDAPI_rumble_lock);
+    while (ctx->requests_tail) {
+        request = ctx->requests_tail;
+        if (request == ctx->requests_head) {
+            ctx->requests_head = NULL;
+        }
+        ctx->requests_tail = request->prev;
+
+        if (request->callback) {
+            request->callback(request->userdata);
+        }
+        (void)SDL_AtomicDecRef(&request->device->rumble_pending);
+        SDL_free(request);
+    }
+    SDL_UnlockMutex(SDL_HIDAPI_rumble_lock);
+
+    if (ctx->request_sem) {
+        SDL_DestroySemaphore(ctx->request_sem);
+        ctx->request_sem = NULL;
+    }
+
+    if (SDL_HIDAPI_rumble_lock) {
+        SDL_DestroyMutex(SDL_HIDAPI_rumble_lock);
+        SDL_HIDAPI_rumble_lock = NULL;
+    }
+
+    SDL_SetAtomicInt(&ctx->initialized, false);
+}
+
+static bool SDL_HIDAPI_StartRumbleThread(SDL_HIDAPI_RumbleContext *ctx)
+{
+    SDL_HIDAPI_rumble_lock = SDL_CreateMutex();
+    if (!SDL_HIDAPI_rumble_lock) {
+        SDL_HIDAPI_StopRumbleThread(ctx);
+        return false;
+    }
+
+    ctx->request_sem = SDL_CreateSemaphore(0);
+    if (!ctx->request_sem) {
+        SDL_HIDAPI_StopRumbleThread(ctx);
+        return false;
+    }
+
+    SDL_SetAtomicInt(&ctx->running, true);
+    ctx->thread = SDL_CreateThread(SDL_HIDAPI_RumbleThread, "HIDAPI Rumble", ctx);
+    if (!ctx->thread) {
+        SDL_HIDAPI_StopRumbleThread(ctx);
+        return false;
+    }
+    return true;
+}
+
+bool SDL_HIDAPI_LockRumble(void)
+{
+    SDL_HIDAPI_RumbleContext *ctx = &rumble_context;
+
+    if (SDL_CompareAndSwapAtomicInt(&ctx->initialized, false, true)) {
+        if (!SDL_HIDAPI_StartRumbleThread(ctx)) {
+            return false;
+        }
+    }
+
+    SDL_LockMutex(SDL_HIDAPI_rumble_lock);
+    return true;
+}
+
+bool SDL_HIDAPI_GetPendingRumbleLocked(SDL_HIDAPI_Device *device, Uint8 **data, int **size, int *maximum_size)
+{
+    SDL_HIDAPI_RumbleContext *ctx = &rumble_context;
+    SDL_HIDAPI_RumbleRequest *request, *found;
+
+    found = NULL;
+    for (request = ctx->requests_tail; request; request = request->prev) {
+        if (request->device == device) {
+            found = request;
+        }
+    }
+    if (found) {
+        *data = found->data;
+        *size = &found->size;
+        *maximum_size = sizeof(found->data);
+        return true;
+    }
+    return false;
+}
+
+int SDL_HIDAPI_SendRumbleAndUnlock(SDL_HIDAPI_Device *device, const Uint8 *data, int size)
+{
+    return SDL_HIDAPI_SendRumbleWithCallbackAndUnlock(device, data, size, NULL, NULL);
+}
+
+int SDL_HIDAPI_SendRumbleWithCallbackAndUnlock(SDL_HIDAPI_Device *device, const Uint8 *data, int size, SDL_HIDAPI_RumbleSentCallback callback, void *userdata)
+{
+    SDL_HIDAPI_RumbleContext *ctx = &rumble_context;
+    SDL_HIDAPI_RumbleRequest *request;
+
+    if (size > sizeof(request->data)) {
+        SDL_HIDAPI_UnlockRumble();
+        SDL_SetError("Couldn't send rumble, size %d is greater than %d", size, (int)sizeof(request->data));
+        return -1;
+    }
+
+    request = (SDL_HIDAPI_RumbleRequest *)SDL_calloc(1, sizeof(*request));
+    if (!request) {
+        SDL_HIDAPI_UnlockRumble();
+        return -1;
+    }
+    request->device = device;
+    SDL_memcpy(request->data, data, size);
+    request->size = size;
+    request->callback = callback;
+    request->userdata = userdata;
+
+    SDL_AtomicIncRef(&device->rumble_pending);
+
+    if (ctx->requests_head) {
+        ctx->requests_head->prev = request;
+    } else {
+        ctx->requests_tail = request;
+    }
+    ctx->requests_head = request;
+
+    // Make sure we unlock before posting the semaphore so the rumble thread can run immediately
+    SDL_HIDAPI_UnlockRumble();
+
+    SDL_SignalSemaphore(ctx->request_sem);
+
+    return size;
+}
+
+void SDL_HIDAPI_UnlockRumble(void)
+{
+    SDL_UnlockMutex(SDL_HIDAPI_rumble_lock);
+}
+
+int SDL_HIDAPI_SendRumble(SDL_HIDAPI_Device *device, const Uint8 *data, int size)
+{
+    Uint8 *pending_data;
+    int *pending_size;
+    int maximum_size;
+
+    if (size <= 0) {
+        SDL_SetError("Tried to send rumble with invalid size");
+        return -1;
+    }
+
+    if (!SDL_HIDAPI_LockRumble()) {
+        return -1;
+    }
+
+    // check if there is a pending request for the device and update it
+    if (SDL_HIDAPI_GetPendingRumbleLocked(device, &pending_data, &pending_size, &maximum_size) &&
+        size == *pending_size && data[0] == pending_data[0]) {
+        SDL_memcpy(pending_data, data, size);
+        SDL_HIDAPI_UnlockRumble();
+        return size;
+    }
+
+    return SDL_HIDAPI_SendRumbleAndUnlock(device, data, size);
+}
+
+void SDL_HIDAPI_QuitRumble(void)
+{
+    SDL_HIDAPI_RumbleContext *ctx = &rumble_context;
+
+    if (SDL_GetAtomicInt(&ctx->running)) {
+        SDL_HIDAPI_StopRumbleThread(ctx);
+    }
+}
+
+#endif // SDL_JOYSTICK_HIDAPI