Function loop

deps/SDL2/test/testgamecontroller.c:97–172

}

void
loop(void *arg)
{
    SDL_Event event;
    int i;
    SDL_GameController *gamecontroller = (SDL_GameController *)arg;

    /* blank screen, set up for drawing this frame. */
    SDL_SetRenderDrawColor(screen, 0xFF, 0xFF, 0xFF, SDL_ALPHA_OPAQUE);
    SDL_RenderClear(screen);
    SDL_RenderCopy(screen, background, NULL, NULL);

    while (SDL_PollEvent(&event)) {
        switch (event.type) {
        case SDL_CONTROLLERAXISMOTION:
            SDL_Log("Controller axis %s changed to %d\n", SDL_GameControllerGetStringForAxis((SDL_GameControllerAxis)event.caxis.axis), event.caxis.value);
            break;
        case SDL_CONTROLLERBUTTONDOWN:
        case SDL_CONTROLLERBUTTONUP:
            SDL_Log("Controller button %s %s\n", SDL_GameControllerGetStringForButton((SDL_GameControllerButton)event.cbutton.button), event.cbutton.state ? "pressed" : "released");
            break;
        case SDL_KEYDOWN:
            if (event.key.keysym.sym != SDLK_ESCAPE) {
                break;
            }
            /* Fall through to signal quit */
        case SDL_QUIT:
            done = SDL_TRUE;
            break;
        default:
            break;
        }
    }

    /* Update visual controller state */
    for (i = 0; i < SDL_CONTROLLER_BUTTON_MAX; ++i) {
        if (SDL_GameControllerGetButton(gamecontroller, (SDL_GameControllerButton)i) == SDL_PRESSED) {
            const SDL_Rect dst = { button_positions[i].x, button_positions[i].y, 50, 50 };
            SDL_RenderCopyEx(screen, button, NULL, &dst, 0, NULL, SDL_FLIP_NONE);
        }
    }

    for (i = 0; i < SDL_CONTROLLER_AXIS_MAX; ++i) {
        const Sint16 deadzone = 8000;  /* !!! FIXME: real deadzone */
        const Sint16 value = SDL_GameControllerGetAxis(gamecontroller, (SDL_GameControllerAxis)(i));
        if (value < -deadzone) {
            const SDL_Rect dst = { axis_positions[i].x, axis_positions[i].y, 50, 50 };
            const double angle = axis_positions[i].angle;
            SDL_RenderCopyEx(screen, axis, NULL, &dst, angle, NULL, SDL_FLIP_NONE);
        } else if (value > deadzone) {
            const SDL_Rect dst = { axis_positions[i].x, axis_positions[i].y, 50, 50 };
            const double angle = axis_positions[i].angle + 180.0;
            SDL_RenderCopyEx(screen, axis, NULL, &dst, angle, NULL, SDL_FLIP_NONE);
        }
    }

    /* Update rumble based on trigger state */
    {