boo/lib/inputdev/DolphinSmashAdapter.cpp

#include "boo/inputdev/DolphinSmashAdapter.hpp"
#include <stdio.h>
#include <string.h>

namespace boo
{

/*
 * Reference: https://github.com/ToadKing/wii-u-gc-adapter/blob/master/wii-u-gc-adapter.c
 */

DolphinSmashAdapter::DolphinSmashAdapter(DeviceToken* token) : DeviceBase(token) {}

DolphinSmashAdapter::~DolphinSmashAdapter() {}

static inline EDolphinControllerType parseType(unsigned char status)
{
    EDolphinControllerType type =
        EDolphinControllerType(status) & (EDolphinControllerType::Normal | EDolphinControllerType::Wavebird);
    switch (type)
    {
    case EDolphinControllerType::Normal:
    case EDolphinControllerType::Wavebird:
        return type;
    default:
        return EDolphinControllerType::None;
    }
}

static inline EDolphinControllerType parseState(DolphinControllerState* stateOut, uint8_t* payload, bool& rumble)
{
    memset(stateOut, 0, sizeof(DolphinControllerState));
    unsigned char status = payload[0];
    EDolphinControllerType type = parseType(status);

    rumble = ((status & 0x04) != 0) ? true : false;

    stateOut->m_btns = (uint16_t)payload[1] << 8 | (uint16_t)payload[2];

    stateOut->m_leftStick[0] = payload[4];
    stateOut->m_leftStick[1] = payload[3];
    stateOut->m_rightStick[0] = payload[6];
    stateOut->m_rightStick[1] = payload[5];
    stateOut->m_analogTriggers[0] = payload[7];
    stateOut->m_analogTriggers[1] = payload[8];

    return type;
}

void DolphinSmashAdapter::initialCycle()
{
    uint8_t handshakePayload[] = {0x13};
    sendUSBInterruptTransfer(handshakePayload, sizeof(handshakePayload));
}

void DolphinSmashAdapter::transferCycle()
{
    uint8_t payload[37];
    size_t recvSz = receiveUSBInterruptTransfer(payload, sizeof(payload));
    if (recvSz != 37 || payload[0] != 0x21)
        return;
    // printf("RECEIVED DATA %zu %02X\n", recvSz, payload[0]);

    if (!m_callback)
        return;

    /* Parse controller states */
    uint8_t* controller = &payload[1];
    uint8_t rumbleMask = 0;
    for (int i = 0; i < 4; i++, controller += 9)
    {
        DolphinControllerState state;
        bool rumble = false;
        EDolphinControllerType type = parseState(&state, controller, rumble);
        if (type != EDolphinControllerType::None && !(m_knownControllers & 1 << i))
        {
            m_knownControllers |= 1 << i;
            m_callback->controllerConnected(i, type);
        }
        else if (type == EDolphinControllerType::None && (m_knownControllers & 1 << i))
        {
            m_knownControllers &= ~(1 << i);
            m_callback->controllerDisconnected(i);
        }
        if (m_knownControllers & 1 << i)
            m_callback->controllerUpdate(i, type, state);
        rumbleMask |= rumble ? 1 << i : 0;
    }

    /* Send rumble message (if needed) */
    uint8_t rumbleReq = m_rumbleRequest & rumbleMask;
    if (rumbleReq != m_rumbleState)
    {
        uint8_t rumbleMessage[5] = {0x11};
        for (int i = 0; i < 4; ++i)
        {
            if (rumbleReq & 1 << i)
                rumbleMessage[i + 1] = 1;
            else if (m_hardStop[i])
                rumbleMessage[i + 1] = 2;
            else
                rumbleMessage[i + 1] = 0;
        }

        sendUSBInterruptTransfer(rumbleMessage, sizeof(rumbleMessage));
        m_rumbleState = rumbleReq;
    }
}

void DolphinSmashAdapter::finalCycle()
{
    uint8_t rumbleMessage[5] = {0x11, 0, 0, 0, 0};
    sendUSBInterruptTransfer(rumbleMessage, sizeof(rumbleMessage));
}

void DolphinSmashAdapter::deviceDisconnected()
{
    if (!m_callback)
        return;
    for (int i = 0; i < 4; i++)
    {
        if (m_knownControllers & 1 << i)
        {
            m_knownControllers &= ~(1 << i);
            m_callback->controllerDisconnected(i);
        }
    }
}

/* The following code is derived from pad.c in libogc
 *
 *  Copyright (C) 2004 - 2009
 *  Michael Wiedenbauer (shagkur)
 *  Dave Murphy (WinterMute)
 *
 * This software is provided 'as-is', without any express or implied
 * warranty.  In no event will the authors be held liable for any
 * damages arising from the use of this software.
 *
 * Permission is granted to anyone to use this software for any
 * purpose, including commercial applications, and to alter it and
 * redistribute it freely, subject to the following restrictions:
 *
 * 1. The origin of this software must not be misrepresented; you
 *    must not claim that you wrote the original software. If you use
 *    this software in a product, an acknowledgment in the product
 *    documentation would be appreciated but is not required.
 * 2. Altered source versions must be plainly marked as such, and
 *    must not be misrepresented as being the original software.
 * 3. This notice may not be removed or altered from any source
 *    distribution.
 */

static uint8_t pad_clampregion[8] = {30, 180, 15, 72, 40, 15, 59, 31};

static void pad_clampstick(int8_t& px, int8_t& py, int8_t max, int8_t xy, int8_t min)
{
    int x = px;
    int y = py;
    int signX;
    int signY;
    int d;

    if (x > 0)
    {
        signX = 1;
    }
    else
    {
        signX = -1;
        x = -x;
    }

    if (y > 0)
    {
        signY = 1;
    }
    else
    {
        signY = -1;
        y = -y;
    }

    if (x <= min)
        x = 0;
    else
        x -= min;

    if (y <= min)
    {
        y = 0;
    }
    else
    {
        y -= min;
    }

    if (x == 0 && y == 0)
    {
        px = py = 0;
        return;
    }

    if (xy * y <= xy * x)
    {
        d = xy * x + (max - xy) * y;
        if (xy * max < d)
        {
            x = int8_t(xy * max * x / d);
            y = int8_t(xy * max * y / d);
        }
    }
    else
    {
        d = xy * y + (max - xy) * x;
        if (xy * max < d)
        {
            x = int8_t(xy * max * x / d);
            y = int8_t(xy * max * y / d);
        }
    }

    px = int8_t(signX * x);
    py = int8_t(signY * y);
}

static void pad_clamptrigger(uint8_t& trigger)
{
    uint8_t min, max;

    min = pad_clampregion[0];
    max = pad_clampregion[1];
    if (min > trigger)
        trigger = 0;
    else
    {
        if (max < trigger)
            trigger = max - min;
        trigger -= min;
    }
}

void DolphinControllerState::clamp()
{
    pad_clampstick(m_leftStick[0], m_leftStick[1], pad_clampregion[3], pad_clampregion[4], pad_clampregion[2]);
    pad_clampstick(m_rightStick[0], m_rightStick[1], pad_clampregion[6], pad_clampregion[7], pad_clampregion[5]);
    pad_clamptrigger(m_analogTriggers[0]);
    pad_clamptrigger(m_analogTriggers[1]);
}
}