From abec04e8e7a124caf17e0d9c1959e4fbb78e948c Mon Sep 17 00:00:00 2001
From: Romain Vimont <rom@rom1v.com>
Date: Fri, 6 Sep 2024 23:08:08 +0200
Subject: [PATCH] Add connected gamepads on start

Trigger SDL_CONTROLLERDEVICEADDED for all gamepads already connected
when scrcpy starts. We want to handle both the gamepads initially
connected and the gamepads connected while scrcpy is running.

This is not racy, because this event may not trigged automatically until
SDL events are "pumped" (SDL_PumpEvents/SDL_WaitEvent).
---
 app/src/scrcpy.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/app/src/scrcpy.c b/app/src/scrcpy.c
index 175100be..97100dae 100644
--- a/app/src/scrcpy.c
+++ b/app/src/scrcpy.c
@@ -337,6 +337,21 @@ scrcpy_generate_scid(void) {
     return sc_rand_u32(&rand) & 0x7FFFFFFF;
 }
 
+static void
+init_sdl_gamepads(void) {
+    // Trigger a SDL_CONTROLLERDEVICEADDED event for all gamepads already
+    // connected
+    int num_joysticks = SDL_NumJoysticks();
+    for (int i = 0; i < num_joysticks; ++i) {
+        if (SDL_IsGameController(i)) {
+            SDL_Event event;
+            event.cdevice.type = SDL_CONTROLLERDEVICEADDED;
+            event.cdevice.which = i;
+            SDL_PushEvent(&event);
+        }
+    }
+}
+
 enum scrcpy_exit_code
 scrcpy(struct scrcpy_options *options) {
     static struct scrcpy scrcpy;
@@ -851,6 +866,11 @@ aoa_complete:
         timeout_started = true;
     }
 
+    bool use_gamepads = true;
+    if (use_gamepads) {
+        init_sdl_gamepads();
+    }
+
     ret = event_loop(s);
     terminate_event_loop();
     LOGD("quit...");