JoystickManager.cc

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#include "JoystickManager.hh"
 
#include "IntegerSetting.hh"
 
#include "narrow.hh"
#include "ranges.hh"
#include "strCat.hh"
 
namespace openmsx {
 
JoystickManager::JoystickManager(CommandController& commandController_)
        : commandController(commandController_)
{
        // Note: we don't explicitly enumerate all joysticks which are already
        // present at startup. Instead we rely on SDL_JOYDEVICEADDED events:
        // these also get send for the initial joysticks.
 
        // joysticks generate events
        SDL_JoystickEventState(SDL_ENABLE); // is this needed?
}
 
JoystickManager::~JoystickManager()
{
        for (auto& info : infos) {
                if (info.joystick) SDL_JoystickClose(info.joystick);
        }
}
 
size_t JoystickManager::getFreeSlot()
{
        if (auto it = ranges::find(infos, nullptr, &Info::joystick); it != infos.end()) {
                return std::distance(infos.begin(), it);
        }
        auto idx = infos.size();
        infos.emplace_back();
        infos[idx].deadZoneSetting = std::make_unique<IntegerSetting>(
                commandController,
                tmpStrCat("joystick", idx + 1, "_deadzone"),
                "size (as a percentage) of the dead center zone",
                25, 0, 100);
        return idx;
}
 
void JoystickManager::add(int deviceIndex)
{
        auto idx = getFreeSlot();
        auto& info = infos[idx];
        info.joystick = SDL_JoystickOpen(deviceIndex);
        info.instanceId = info.joystick ? SDL_JoystickInstanceID(info.joystick) : -1;
}
 
void JoystickManager::remove(int instanceId)
{
        auto it = ranges::find(infos, instanceId, &Info::instanceId);
        if (it == infos.end()) return; // this shouldn't happen
 
        SDL_JoystickClose(it->joystick);
        it->joystick = nullptr;
        it->instanceId = -1;
}
 
std::vector<JoystickId> JoystickManager::getConnectedJoysticks() const
{
        // TODO c++20 view::filter | view::transform
        std::vector<JoystickId> result;
        for (auto i : xrange(infos.size())) {
                if (!infos[i].joystick) continue;
                result.push_back(JoystickId(unsigned(i)));
        }
        return result;
}
 
IntegerSetting* JoystickManager::getJoyDeadZoneSetting(JoystickId joyId) const
{
        unsigned id = joyId.raw();
        return (id < infos.size()) ? infos[id].deadZoneSetting.get() : nullptr;
}
 
std::string JoystickManager::getDisplayName(JoystickId joyId) const
{
        unsigned id = joyId.raw();
        auto* joystick = (id < infos.size()) ? infos[id].joystick : nullptr;
        return joystick ? SDL_JoystickName(joystick) : "[Not plugged in]";
}
 
std::optional<unsigned> JoystickManager::getNumButtons(JoystickId joyId) const
{
        unsigned id = joyId.raw();
        auto* joystick = (id < infos.size()) ? infos[id].joystick : nullptr;
        if (!joystick) return {};
        return SDL_JoystickNumButtons(joystick);
}
 
std::optional<JoystickId> JoystickManager::translateSdlInstanceId(SDL_Event& evt) const
{
        int instanceId = evt.jbutton.which; // any SDL joystick event
        auto it = ranges::find(infos, instanceId, &Info::instanceId);
        if (it == infos.end()) return {}; // should not happen
        evt.jbutton.which = narrow<int>(std::distance(infos.begin(), it));
        return JoystickId(evt.jbutton.which);
}
 
} // namespace openmsx