[Bug] Can't receive `SDL_MOUSE_BUTTON_DOWN` and `SDL_EVENT_MOUSE_BUTTON_UP` event

[CoraBlack]

System info:

archLinux gnome wayland and windows 11 latest.

Issue

By my debug, I found the code can't always reach the case SDL_EVENT_MOUSE_BUTTON_DOWN and SDL_EVENT_MOUSE_BUTTON_UP

test code

#include <SDL3/SDL.h>

#include <cstdio>
#include <iostream>

// A window for event system to work 
struct Window {
    Window() {
        SDL_Init(SDL_INIT_VIDEO);

        win_ptr = SDL_CreateWindow("Window for input test", 640, 480, SDL_WINDOW_RESIZABLE);
        if (!win_ptr) {
            std::cerr << "Failed to create SDL window: " << SDL_GetError() << std::endl;
            std::exit(1);
        }

        renderer = SDL_CreateRenderer(win_ptr, nullptr);
        if (!renderer) {
            std::cerr << "Failed to create SDL renderer: " << SDL_GetError() << std::endl;
            std::exit(1);
        }

        // Provide first frame for window to be ready and input system to initialize properly
        // This is necessary for the test to work correctly in Linux wayland environment
        SDL_RenderClear(renderer);
        SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
        SDL_RenderPresent(renderer);

        SDL_ShowWindow(win_ptr);
    }

    ~Window() {
        SDL_DestroyRenderer(renderer);
        SDL_DestroyWindow(win_ptr);
    }

    SDL_Window* win_ptr = nullptr;
    SDL_Renderer* renderer = nullptr;
};

static const char* MouseButtonToString(Uint8 button) {
    switch (button) {
        case SDL_BUTTON_LEFT:
            return "Left";
        case SDL_BUTTON_MIDDLE:
            return "Middle";
        case SDL_BUTTON_RIGHT:
            return "Right";
        case SDL_BUTTON_X1:
            return "X1";
        case SDL_BUTTON_X2:
            return "X2";
        default:
            return "Unknown";
    }
}

int main(int, char**) {
    auto window = Window{};

    std::puts("Click mouse buttons inside the window. Press ESC or close window to quit.");
    std::puts("Valid button constants: LEFT=1, MIDDLE=2, RIGHT=3, X1=4, X2=5");

    bool running = true;
    while (running) {
        SDL_Event event;
        while (SDL_PollEvent(&event)) {
            switch (event.type) {
                case SDL_EVENT_QUIT:
                    running = false;
                    break;

                case SDL_EVENT_KEY_DOWN:
                    if (event.key.key == SDLK_ESCAPE) {
                        running = false;
                    }
                    break;

                case SDL_EVENT_MOUSE_BUTTON_DOWN:
                case SDL_EVENT_MOUSE_BUTTON_UP: {
                    const SDL_MouseButtonEvent& b = event.button;
                    const char* action = b.down ? "DOWN" : "UP";
                    std::printf(
                        "Mouse %s | button=%u (%s) | clicks=%u | x=%.1f y=%.1f\n",
                        action,
                        static_cast<unsigned>(b.button),
                        MouseButtonToString(b.button),
                        static_cast<unsigned>(b.clicks),
                        b.x,
                        b.y
                    );
                    break;
                }

                default:
                    break;
            }
        }

        SDL_Delay(16);
    }

    SDL_Quit();
    return 0;
}

[Kontrabant]

I built your code and it seems to work correctly on my machine. Given that you are seeing this issue on both Linux and Windows, are you sure that it's not some kind of hardware issue on your end?

[CoraBlack]

I built your code and it seems to work correctly on my machine. Given that you are seeing this issue on both Linux and Windows, are you sure that it's not some kind of hardware issue on your end?

I am not sure. I have tried to click the window by my mouse and touchpad in my two OS.

[CoraBlack]

I retest the code in my friend's computer. It worked. Thanks for your response.