citra/src/input_common/sdl_input/sdl_input.cpp

// Copyright 2015 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.

#include "input_common/sdl_input/sdl_input.h"

#include "common/key_map.h"

namespace InputCommon {

SDLController::SDLController() {
    device_name = "SDL2::NONE";
    jpad = nullptr;
    index = 0;

    controller.circle_pad_x = 0;
    controller.circle_pad_y = 0;
    controller.touch_screen_x = 0;
    controller.touch_screen_y = 0;

    activated = Init();
}

SDLController::~SDLController() {
    Shutdown();
}

bool SDLController::Init() {

    //Attempt to initialize SDL with joystick only
    if (SDL_Init(SDL_INIT_JOYSTICK) != 0) {
        return false;
    }

    //Attempt to open joystick with SDL
    //TODO - Use DiscoverDevice to generate a list of available joysticks, then open the correct index
    jpad = SDL_JoystickOpen(index);

    if (jpad == nullptr) {
        return false;
    }

    device_name = SDL_JoystickNameForIndex(index);

    //If joystick successfully opened, load up keymap from input configuration
    //TODO - Make it NOT hardcoded
    joypad_id = KeyMap::NewDeviceId();
    SetupKeyMaps();

    //TODO - Make it NOT hardcoded
    SetDeadZone(8000);

    return true;
}

void SDLController::DiscoverDevices() {}

void SDLController::Shutdown() {
    //Attempt to close joystick with SDL
    if (jpad != nullptr) {
        SDL_JoystickClose(jpad);
    }
}

void SDLController::Poll() {
    if (SDL_PollEvent(&input_event)) {
        if (input_event.type == SDL_JOYBUTTONDOWN || input_event.type == SDL_JOYBUTTONUP
        || input_event.type == SDL_JOYAXISMOTION || input_event.type == SDL_JOYHATMOTION) {
            ProcessInput();
        }
    }
}

void SDLController::ProcessInput() {
    //Use a unique id for joystick input
    int pad_id = 0;
    int val = 0;

    //Generate the id based on input from an event
    switch (input_event.type) {
        //Joystick button press events
        case SDL_JOYBUTTONDOWN:
            pad_id = 100;
            pad_id += input_event.jbutton.button;

            controller.pad_state.hex |= KeyMap::GetPadKey({pad_id, joypad_id}).hex;
            break;

        //Joystick button release events
        case SDL_JOYBUTTONUP:
            pad_id = 100;
            pad_id += input_event.jbutton.button;

            controller.pad_state.hex &= ~KeyMap::GetPadKey({pad_id, joypad_id}).hex;
            break;

        //Joystick axis motion events
        case SDL_JOYAXISMOTION:
            pad_id = 200;
            pad_id += (input_event.jaxis.axis * 2);
            val = input_event.jaxis.value;

            if (val > 0) {
                pad_id += 1;
            }

            //If analog input is beyond dead zone, set it
            if (CheckDeadZone(val)) {
                controller.pad_state.hex |= KeyMap::GetPadKey({pad_id, joypad_id}).hex;
            } else {
                controller.pad_state.hex &= ~KeyMap::GetPadKey({pad_id, joypad_id}).hex;
            }

            //Release opposite axis
            if (pad_id % 2 == 0) {
                controller.pad_state.hex &= ~KeyMap::GetPadKey({pad_id+1, joypad_id}).hex;
            } else {
                controller.pad_state.hex &= ~KeyMap::GetPadKey({pad_id-1, joypad_id}).hex;
            }

            break;

        //Joystick hat motion events
        case SDL_JOYHATMOTION:
            pad_id = 300;
            pad_id += input_event.jhat.hat * 4;

            switch (input_event.jhat.value) {
                case SDL_HAT_CENTERED:
                    controller.pad_state.hex &= ~KeyMap::GetPadKey({pad_id, joypad_id}).hex;
                    controller.pad_state.hex &= ~KeyMap::GetPadKey({pad_id+1, joypad_id}).hex;
                    controller.pad_state.hex &= ~KeyMap::GetPadKey({pad_id+2, joypad_id}).hex;
                    controller.pad_state.hex &= ~KeyMap::GetPadKey({pad_id+3, joypad_id}).hex;
                    break;

                case SDL_HAT_LEFT:
                    controller.pad_state.hex |= KeyMap::GetPadKey({pad_id, joypad_id}).hex;
                    controller.pad_state.hex &= ~KeyMap::GetPadKey({pad_id+1, joypad_id}).hex;
                    controller.pad_state.hex &= ~KeyMap::GetPadKey({pad_id+2, joypad_id}).hex;
                    controller.pad_state.hex &= ~KeyMap::GetPadKey({pad_id+3, joypad_id}).hex;
                    break;

                case SDL_HAT_LEFTUP:
                    controller.pad_state.hex |= KeyMap::GetPadKey({pad_id, joypad_id}).hex;
                    controller.pad_state.hex &= ~KeyMap::GetPadKey({pad_id+1, joypad_id}).hex;
                    controller.pad_state.hex |= KeyMap::GetPadKey({pad_id+2, joypad_id}).hex;
                    controller.pad_state.hex &= ~KeyMap::GetPadKey({pad_id+3, joypad_id}).hex;
                    break;

                case SDL_HAT_LEFTDOWN:
                    controller.pad_state.hex |= KeyMap::GetPadKey({pad_id, joypad_id}).hex;
                    controller.pad_state.hex &= ~KeyMap::GetPadKey({pad_id+1, joypad_id}).hex;
                    controller.pad_state.hex &= ~KeyMap::GetPadKey({pad_id+2, joypad_id}).hex;
                    controller.pad_state.hex |= KeyMap::GetPadKey({pad_id+3, joypad_id}).hex;
                    break;

                case SDL_HAT_RIGHT:
                    controller.pad_state.hex &= ~KeyMap::GetPadKey({pad_id, joypad_id}).hex;
                    controller.pad_state.hex |= KeyMap::GetPadKey({pad_id+1, joypad_id}).hex;
                    controller.pad_state.hex &= ~KeyMap::GetPadKey({pad_id+2, joypad_id}).hex;
                    controller.pad_state.hex &= ~KeyMap::GetPadKey({pad_id+3, joypad_id}).hex;
                    break;

                case SDL_HAT_RIGHTUP:
                    controller.pad_state.hex &= ~KeyMap::GetPadKey({pad_id, joypad_id}).hex;
                    controller.pad_state.hex |= KeyMap::GetPadKey({pad_id+1, joypad_id}).hex;
                    controller.pad_state.hex |= KeyMap::GetPadKey({pad_id+2, joypad_id}).hex;
                    controller.pad_state.hex &= ~KeyMap::GetPadKey({pad_id+3, joypad_id}).hex;
                    break;

                case SDL_HAT_RIGHTDOWN:
                    controller.pad_state.hex &= ~KeyMap::GetPadKey({pad_id, joypad_id}).hex;
                    controller.pad_state.hex |= KeyMap::GetPadKey({pad_id+1, joypad_id}).hex;
                    controller.pad_state.hex &= ~KeyMap::GetPadKey({pad_id+2, joypad_id}).hex;
                    controller.pad_state.hex |= KeyMap::GetPadKey({pad_id+3, joypad_id}).hex;
                    break;

                case SDL_HAT_UP:
                    controller.pad_state.hex &= ~KeyMap::GetPadKey({pad_id, joypad_id}).hex;
                    controller.pad_state.hex &= ~KeyMap::GetPadKey({pad_id+1, joypad_id}).hex;
                    controller.pad_state.hex |= KeyMap::GetPadKey({pad_id+2, joypad_id}).hex;
                    controller.pad_state.hex &= ~KeyMap::GetPadKey({pad_id+3, joypad_id}).hex;
                    break;

                case SDL_HAT_DOWN:
                    controller.pad_state.hex &= ~KeyMap::GetPadKey({pad_id, joypad_id}).hex;
                    controller.pad_state.hex &= ~KeyMap::GetPadKey({pad_id+1, joypad_id}).hex;
                    controller.pad_state.hex &= ~KeyMap::GetPadKey({pad_id+2, joypad_id}).hex;
                    controller.pad_state.hex |= KeyMap::GetPadKey({pad_id+3, joypad_id}).hex;
                    break;
            }

            break;
    }
}

void SDLController::SetupKeyMaps() {
    KeyMap::SetKeyMapping({100, joypad_id}, Service::HID::PAD_A);
    KeyMap::SetKeyMapping({101, joypad_id}, Service::HID::PAD_B);
    KeyMap::SetKeyMapping({102, joypad_id}, Service::HID::PAD_X);
    KeyMap::SetKeyMapping({103, joypad_id}, Service::HID::PAD_Y);
    KeyMap::SetKeyMapping({104, joypad_id}, Service::HID::PAD_R);
    KeyMap::SetKeyMapping({105, joypad_id}, Service::HID::PAD_L);
    KeyMap::SetKeyMapping({0, joypad_id}, Service::HID::PAD_ZL);
    KeyMap::SetKeyMapping({0, joypad_id}, Service::HID::PAD_ZR);

    KeyMap::SetKeyMapping({107, joypad_id}, Service::HID::PAD_START);
    KeyMap::SetKeyMapping({106, joypad_id}, Service::HID::PAD_SELECT);

    KeyMap::SetKeyMapping({300, joypad_id}, Service::HID::PAD_LEFT);
    KeyMap::SetKeyMapping({301, joypad_id}, Service::HID::PAD_RIGHT);
    KeyMap::SetKeyMapping({302, joypad_id}, Service::HID::PAD_UP);
    KeyMap::SetKeyMapping({303, joypad_id}, Service::HID::PAD_DOWN);

    KeyMap::SetKeyMapping({0, joypad_id}, Service::HID::PAD_C_LEFT);
    KeyMap::SetKeyMapping({0, joypad_id}, Service::HID::PAD_C_RIGHT);
    KeyMap::SetKeyMapping({0, joypad_id}, Service::HID::PAD_C_UP);
    KeyMap::SetKeyMapping({0, joypad_id}, Service::HID::PAD_C_DOWN);

    KeyMap::SetKeyMapping({200, joypad_id}, Service::HID::PAD_CIRCLE_LEFT);
    KeyMap::SetKeyMapping({201, joypad_id}, Service::HID::PAD_CIRCLE_RIGHT);
    KeyMap::SetKeyMapping({202, joypad_id}, Service::HID::PAD_CIRCLE_UP);
    KeyMap::SetKeyMapping({203, joypad_id}, Service::HID::PAD_CIRCLE_DOWN);
}

void SDLController::SetDeadZone(int range) {
    dead_zone = range;
}

bool SDLController::CheckDeadZone(int range) {
    if ((range < -dead_zone) || (range > dead_zone)) {
        return true;
    } else if ((range > -dead_zone) && (range < dead_zone)) {
        return false;
    }
}

}//namespace