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feat: Add mouse wheel support for game input passthrough

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- Implement mouse wheel event handling in SDL2 backend (emu_window_sdl2)
- Add wheel event routing from GRenderWindow to input subsystem
- Add debugging logs to trace mouse wheel events through input chain
- Support mouse wheel input for mods like Ultracam when games are running (WIP)

Signed-off-by: Zephyron <zephyron@citron-emu.org>
This commit is contained in:
Zephyron
2025-09-14 15:18:38 +10:00
parent 206d778782
commit 56d8bd7dd3
8 changed files with 34 additions and 0 deletions
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9
src/citron_cmd/emu_window/emu_window_sdl2.cpp
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@@ -1,4 +1,5 @@
// SPDX-FileCopyrightText: 2016 Citra Emulator Project
// SPDX-FileCopyrightText: 2025 citron Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#include <SDL.h>
@@ -77,6 +78,11 @@ void EmuWindow_SDL2::OnMouseMotion(s32 x, s32 y) {
input_subsystem->GetMouse()->TouchMove(touch_x, touch_y);
}
void EmuWindow_SDL2::OnMouseWheel(s32 x, s32 y) {
input_subsystem->GetMouse()->MouseWheelChange(x, y);
LOG_DEBUG(Frontend, "SDL2 Mouse wheel event: x={}, y={}", x, y);
}
void EmuWindow_SDL2::OnFingerDown(float x, float y, std::size_t id) {
input_subsystem->GetTouchScreen()->TouchPressed(x, y, id);
}
@@ -202,6 +208,9 @@ void EmuWindow_SDL2::WaitEvent() {
OnMouseButton(event.button.button, event.button.state, event.button.x, event.button.y);
}
break;
case SDL_MOUSEWHEEL:
OnMouseWheel(event.wheel.x, event.wheel.y);
break;
case SDL_FINGERDOWN:
OnFingerDown(event.tfinger.x, event.tfinger.y,
static_cast<std::size_t>(event.tfinger.touchId));

4
src/citron_cmd/emu_window/emu_window_sdl2.h
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@@ -1,4 +1,5 @@
// SPDX-FileCopyrightText: 2016 Citra Emulator Project
// SPDX-FileCopyrightText: 2025 citron Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#pragma once
@@ -52,6 +53,9 @@ protected:
/// Called by WaitEvent when the mouse moves.
void OnMouseMotion(s32 x, s32 y);
/// Called by WaitEvent when the mouse wheel is scrolled
void OnMouseWheel(s32 x, s32 y);
/// Called by WaitEvent when a finger starts touching the touchscreen
void OnFingerDown(float x, float y, std::size_t id);