axmol/core/platform/GLView.cpp

/****************************************************************************
Copyright (c) 2010-2012 cocos2d-x.org
Copyright (c) 2013-2016 Chukong Technologies Inc.
Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.

https://axmolengine.github.io/

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The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
****************************************************************************/

#include "platform/GLView.h"

#include "base/Touch.h"
#include "base/Director.h"
#include "base/EventDispatcher.h"
#include "2d/Camera.h"
#include "2d/Scene.h"
#include "renderer/Renderer.h"

NS_AX_BEGIN

namespace
{

static Touch* g_touches[EventTouch::MAX_TOUCHES] = {nullptr};
static unsigned int g_indexBitsUsed              = 0;
// System touch pointer ID (It may not be ascending order number) <-> Ascending order number from 0
static std::map<intptr_t, int> g_touchIdReorderMap;

static int getUnUsedIndex()
{
    int i;
    int temp = g_indexBitsUsed;

    for (i = 0; i < EventTouch::MAX_TOUCHES; i++)
    {
        if (!(temp & 0x00000001))
        {
            g_indexBitsUsed |= (1 << i);
            return i;
        }

        temp >>= 1;
    }

    // all bits are used
    return -1;
}

static std::vector<Touch*> getAllTouchesVector()
{
    std::vector<Touch*> ret;
    int i;
    int temp = g_indexBitsUsed;

    ret.reserve(EventTouch::MAX_TOUCHES);
    for (i = 0; i < EventTouch::MAX_TOUCHES; i++)
    {
        if (temp & 0x00000001)
        {
            ret.emplace_back(g_touches[i]);
        }
        temp >>= 1;
    }
    return ret;
}

static void removeUsedIndexBit(int index)
{
    if (index < 0 || index >= EventTouch::MAX_TOUCHES)
    {
        return;
    }

    unsigned int temp = 1 << index;
    temp              = ~temp;
    g_indexBitsUsed &= temp;
}

}  // namespace

// default context attributions are set as follows
GLContextAttrs GLView::_glContextAttrs = {8, 8, 8, 8, 24, 8, 0};

void GLView::setGLContextAttrs(GLContextAttrs& glContextAttrs)
{
    _glContextAttrs = glContextAttrs;
}

GLContextAttrs GLView::getGLContextAttrs()
{
    return _glContextAttrs;
}

GLView::GLView()
    : _screenSize(0, 0)
    , _designResolutionSize(0, 0)
    , _scaleX(1.0f)
    , _scaleY(1.0f)
    , _resolutionPolicy(ResolutionPolicy::UNKNOWN)
{}

GLView::~GLView() {}

void GLView::pollEvents() {}

void GLView::updateDesignResolutionSize()
{
    if (_screenSize.width > 0 && _screenSize.height > 0 && _designResolutionSize.width > 0 &&
        _designResolutionSize.height > 0)
    {
        _scaleX = (float)_screenSize.width / _designResolutionSize.width;
        _scaleY = (float)_screenSize.height / _designResolutionSize.height;

        if (_resolutionPolicy == ResolutionPolicy::NO_BORDER)
        {
            _scaleX = _scaleY = MAX(_scaleX, _scaleY);
        }

        else if (_resolutionPolicy == ResolutionPolicy::SHOW_ALL)
        {
            _scaleX = _scaleY = MIN(_scaleX, _scaleY);
        }

        else if (_resolutionPolicy == ResolutionPolicy::FIXED_HEIGHT)
        {
            _scaleX                     = _scaleY;
            _designResolutionSize.width = ceilf(_screenSize.width / _scaleX);
        }

        else if (_resolutionPolicy == ResolutionPolicy::FIXED_WIDTH)
        {
            _scaleY                      = _scaleX;
            _designResolutionSize.height = ceilf(_screenSize.height / _scaleY);
        }

        // calculate the rect of viewport
        float viewPortW = _designResolutionSize.width * _scaleX;
        float viewPortH = _designResolutionSize.height * _scaleY;

        _viewPortRect.setRect((_screenSize.width - viewPortW) / 2, (_screenSize.height - viewPortH) / 2, viewPortW,
                              viewPortH);

        // reset director's member variables to fit visible rect
        auto director                   = Director::getInstance();
        director->_winSizeInPoints      = getDesignResolutionSize();
        director->_isStatusLabelUpdated = true;
        director->setProjection(director->getProjection());

        // Github issue #16139
        // A default viewport is needed in order to display the FPS,
        // since the FPS are rendered in the Director, and there is no viewport there.
        // Everything, including the FPS should renderer in the Scene.
        // TODO: minggo
        //        glViewport(0, 0, _screenSize.width, _screenSize.height);
    }
}

void GLView::setDesignResolutionSize(float width, float height, ResolutionPolicy resolutionPolicy)
{
    AXASSERT(resolutionPolicy != ResolutionPolicy::UNKNOWN, "should set resolutionPolicy");

    if (width == 0.0f || height == 0.0f)
    {
        return;
    }

    _designResolutionSize.set(width, height);
    _resolutionPolicy = resolutionPolicy;

    updateDesignResolutionSize();
}

const Vec2& GLView::getDesignResolutionSize() const
{
    return _designResolutionSize;
}

Vec2 GLView::getFrameSize() const
{
    return _screenSize;
}

void GLView::setFrameSize(float width, float height)
{
    _screenSize = Vec2(width, height);

    // Github issue #16003 and #16485
    // only update the designResolution if it wasn't previously set
    if (_designResolutionSize.equals(Vec2::ZERO))
        _designResolutionSize = _screenSize;
}

Rect GLView::getVisibleRect() const
{
    Rect ret;
    ret.size   = getVisibleSize();
    ret.origin = getVisibleOrigin();
    return ret;
}

Rect GLView::getSafeAreaRect() const
{
    return getVisibleRect();
}

Vec2 GLView::getVisibleSize() const
{
    if (_resolutionPolicy == ResolutionPolicy::NO_BORDER)
    {
        return Vec2(_screenSize.width / _scaleX, _screenSize.height / _scaleY);
    }
    else
    {
        return _designResolutionSize;
    }
}

Vec2 GLView::getVisibleOrigin() const
{
    if (_resolutionPolicy == ResolutionPolicy::NO_BORDER)
    {
        return Vec2((_designResolutionSize.width - _screenSize.width / _scaleX) / 2,
                    (_designResolutionSize.height - _screenSize.height / _scaleY) / 2);
    }
    else
    {
        return Vec2::ZERO;
    }
}

void GLView::setViewPortInPoints(float x, float y, float w, float h)
{
    Viewport vp;
    vp.x = (int)(x * _scaleX + _viewPortRect.origin.x);
    vp.y = (int)(y * _scaleY + _viewPortRect.origin.y);
    vp.w = (unsigned int)(w * _scaleX);
    vp.h = (unsigned int)(h * _scaleY);
    Camera::setDefaultViewport(vp);
}

void GLView::setScissorInPoints(float x, float y, float w, float h)
{
    auto renderer = Director::getInstance()->getRenderer();
    renderer->setScissorRect((int)(x * _scaleX + _viewPortRect.origin.x), (int)(y * _scaleY + _viewPortRect.origin.y),
                             (unsigned int)(w * _scaleX), (unsigned int)(h * _scaleY));
}

bool GLView::isScissorEnabled()
{
    auto renderer = Director::getInstance()->getRenderer();
    return renderer->getScissorTest();
}

Rect GLView::getScissorRect() const
{
    auto renderer = Director::getInstance()->getRenderer();
    auto& rect    = renderer->getScissorRect();

    float x = (rect.x - _viewPortRect.origin.x) / _scaleX;
    float y = (rect.y - _viewPortRect.origin.y) / _scaleY;
    float w = rect.width / _scaleX;
    float h = rect.height / _scaleY;
    return Rect(x, y, w, h);
}

void GLView::setViewName(std::string_view viewname)
{
    _viewName = viewname;
}

std::string_view GLView::getViewName() const
{
    return _viewName;
}

void GLView::handleTouchesBegin(int num, intptr_t ids[], float xs[], float ys[])
{
    intptr_t id     = 0;
    float x         = 0.0f;
    float y         = 0.0f;
    int unusedIndex = 0;
    EventTouch touchEvent;

    for (int i = 0; i < num; ++i)
    {
        id = ids[i];
        x  = xs[i];
        y  = ys[i];

        auto iter = g_touchIdReorderMap.find(id);

        // it is a new touch
        if (iter == g_touchIdReorderMap.end())
        {
            unusedIndex = getUnUsedIndex();

            // The touches is more than MAX_TOUCHES ?
            if (unusedIndex == -1)
            {
                AXLOG("The touches is more than MAX_TOUCHES, unusedIndex = %d", unusedIndex);
                continue;
            }

            Touch* touch = g_touches[unusedIndex] = new Touch();
            touch->setTouchInfo(unusedIndex, (x - _viewPortRect.origin.x) / _scaleX,
                                (y - _viewPortRect.origin.y) / _scaleY);

            AXLOGINFO("x = %f y = %f", touch->getLocationInView().x, touch->getLocationInView().y);

            g_touchIdReorderMap.emplace(id, unusedIndex);
            touchEvent._touches.emplace_back(touch);
        }
    }

    if (touchEvent._touches.empty())
    {
        AXLOG("touchesBegan: size = 0");
        return;
    }

    touchEvent._eventCode = EventTouch::EventCode::BEGAN;
    auto dispatcher       = Director::getInstance()->getEventDispatcher();
    dispatcher->dispatchEvent(&touchEvent);
}

void GLView::handleTouchesMove(int num, intptr_t ids[], float xs[], float ys[])
{
    handleTouchesMove(num, ids, xs, ys, nullptr, nullptr);
}

void GLView::handleTouchesMove(int num, intptr_t ids[], float xs[], float ys[], float fs[], float ms[])
{
    intptr_t id    = 0;
    float x        = 0.0f;
    float y        = 0.0f;
    float force    = 0.0f;
    float maxForce = 0.0f;
    EventTouch touchEvent;

    for (int i = 0; i < num; ++i)
    {
        id       = ids[i];
        x        = xs[i];
        y        = ys[i];
        force    = fs ? fs[i] : 0.0f;
        maxForce = ms ? ms[i] : 0.0f;

        auto iter = g_touchIdReorderMap.find(id);
        if (iter == g_touchIdReorderMap.end())
        {
            AXLOG("if the index doesn't exist, it is an error");
            continue;
        }

        AXLOGINFO("Moving touches with id: %d, x=%f, y=%f, force=%f, maxFource=%f", (int)id, x, y, force, maxForce);
        Touch* touch = g_touches[iter->second];
        if (touch)
        {
            touch->setTouchInfo(iter->second, (x - _viewPortRect.origin.x) / _scaleX,
                                (y - _viewPortRect.origin.y) / _scaleY, force, maxForce);

            touchEvent._touches.emplace_back(touch);
        }
        else
        {
            // It is error, should return.
            AXLOG("Moving touches with id: %d error", static_cast<int32_t>(id));
            return;
        }
    }

    if (touchEvent._touches.empty())
    {
        AXLOG("touchesMoved: size = 0");
        return;
    }

    touchEvent._eventCode = EventTouch::EventCode::MOVED;
    auto dispatcher       = Director::getInstance()->getEventDispatcher();
    dispatcher->dispatchEvent(&touchEvent);
}

void GLView::handleTouchesOfEndOrCancel(EventTouch::EventCode eventCode,
                                        int num,
                                        intptr_t ids[],
                                        float xs[],
                                        float ys[])
{
    intptr_t id = 0;
    float x     = 0.0f;
    float y     = 0.0f;
    EventTouch touchEvent;

    for (int i = 0; i < num; ++i)
    {
        id = ids[i];
        x  = xs[i];
        y  = ys[i];

        auto iter = g_touchIdReorderMap.find(id);
        if (iter == g_touchIdReorderMap.end())
        {
            AXLOG("if the index doesn't exist, it is an error");
            continue;
        }

        /* Add to the set to send to the director */
        Touch* touch = g_touches[iter->second];
        if (touch)
        {
            AXLOGINFO("Ending touches with id: %d, x=%f, y=%f", (int)id, x, y);
            touch->setTouchInfo(iter->second, (x - _viewPortRect.origin.x) / _scaleX,
                                (y - _viewPortRect.origin.y) / _scaleY);

            touchEvent._touches.emplace_back(touch);

            g_touches[iter->second] = nullptr;
            removeUsedIndexBit(iter->second);

            g_touchIdReorderMap.erase(id);
        }
        else
        {
            AXLOG("Ending touches with id: %d error", static_cast<int32_t>(id));
            return;
        }
    }

    if (touchEvent._touches.empty())
    {
        AXLOG("touchesEnded or touchesCancel: size = 0");
        return;
    }

    touchEvent._eventCode = eventCode;
    auto dispatcher       = Director::getInstance()->getEventDispatcher();
    dispatcher->dispatchEvent(&touchEvent);

    for (auto&& touch : touchEvent._touches)
    {
        // release the touch object.
        touch->release();
    }
}

void GLView::handleTouchesEnd(int num, intptr_t ids[], float xs[], float ys[])
{
    handleTouchesOfEndOrCancel(EventTouch::EventCode::ENDED, num, ids, xs, ys);
}

void GLView::handleTouchesCancel(int num, intptr_t ids[], float xs[], float ys[])
{
    handleTouchesOfEndOrCancel(EventTouch::EventCode::CANCELLED, num, ids, xs, ys);
}

const Rect& GLView::getViewPortRect() const
{
    return _viewPortRect;
}

std::vector<Touch*> GLView::getAllTouches() const
{
    return getAllTouchesVector();
}

float GLView::getScaleX() const
{
    return _scaleX;
}

float GLView::getScaleY() const
{
    return _scaleY;
}

void GLView::renderScene(Scene* scene, Renderer* renderer)
{
    AXASSERT(scene, "Invalid Scene");
    AXASSERT(renderer, "Invalid Renderer");

    scene->render(renderer, Mat4::IDENTITY, nullptr);
}

void GLView::queueOperation(AsyncOperation /*op*/, void* /*param*/)
{
}

NS_AX_END