From 3e68244dd3f410da5ff5cce3e6bb1c40743a7c51 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 be trigged automatically
until SDL events are "pumped" (SDL_PumpEvents/SDL_WaitEvent).

PR #5270 <https://github.com/Genymobile/scrcpy/pull/5270>
---
 app/src/scrcpy.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/app/src/scrcpy.c b/app/src/scrcpy.c
index bd706cc1..fbd00db7 100644
--- a/app/src/scrcpy.c
+++ b/app/src/scrcpy.c
@@ -342,6 +342,21 @@ 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;
@@ -868,6 +883,11 @@ aoa_complete:
         timeout_started = true;
     }
 
+    if (options->control
+            && options->gamepad_input_mode != SC_GAMEPAD_INPUT_MODE_DISABLED) {
+        init_sdl_gamepads();
+    }
+
     ret = event_loop(s);
     terminate_event_loop();
     LOGD("quit...");