qgl.cpp

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/****************************************************************************
**
** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtOpenGL module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia.  For licensing terms and
** conditions see http://qt.digia.com/licensing.  For further information
** use the contact form at http://qt.digia.com/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights.  These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
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** $QT_END_LICENSE$
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****************************************************************************/

#include "qapplication.h"
#include "qplatformdefs.h"
#include "qgl.h"
#include <qdebug.h>

#if defined(Q_WS_X11)
#include "private/qt_x11_p.h"
#include "private/qpixmap_x11_p.h"
#define INT32 dummy_INT32
#define INT8 dummy_INT8
#ifdef QT_NO_EGL
# include <GL/glx.h>
#endif
#undef INT32
#undef INT8
#include "qx11info_x11.h"
#elif defined(Q_WS_MAC)
# include <private/qt_mac_p.h>
#endif

#include <qdatetime.h>

#include <stdlib.h> // malloc

#include "qpixmap.h"
#include "qimage.h"
#include "qgl_p.h"

#if !defined(QT_OPENGL_ES_1)
#include "gl2paintengineex/qpaintengineex_opengl2_p.h"
#include <private/qwindowsurface_gl_p.h>
#endif

#ifndef QT_OPENGL_ES_2
#include <private/qpaintengine_opengl_p.h>
#endif

#ifdef Q_WS_QWS
#include <private/qglwindowsurface_qws_p.h>
#endif

#ifdef Q_WS_QPA
#include <QtGui/QPlatformGLContext>
#endif

#include <qglpixelbuffer.h>
#include <qglframebufferobject.h>

#include <private/qimage_p.h>
#include <private/qpixmapdata_p.h>
#include <private/qpixmapdata_gl_p.h>
#include <private/qglpixelbuffer_p.h>
#include <private/qimagepixmapcleanuphooks_p.h>
#include "qcolormap.h"
#include "qfile.h"
#include "qlibrary.h"
#include <qmutex.h>

#if defined(QT_OPENGL_ES) && !defined(QT_NO_EGL)
#include <EGL/egl.h>
#endif

#ifdef Q_OS_SYMBIAN
#include <private/qgltexturepool_p.h>
#include <private/qeglcontext_p.h>
#endif

// #define QT_GL_CONTEXT_RESOURCE_DEBUG

QT_BEGIN_NAMESPACE

#if defined(Q_WS_X11) || defined(Q_WS_MAC) || defined(Q_WS_QWS) || defined(Q_WS_QPA) || defined(Q_OS_SYMBIAN)
QGLExtensionFuncs QGLContextPrivate::qt_extensionFuncs;
#endif

#ifdef Q_WS_X11
extern const QX11Info *qt_x11Info(const QPaintDevice *pd);
#endif

struct QGLThreadContext {
    ~QGLThreadContext() {
        if (context)
            context->doneCurrent();
    }
    QGLContext *context;
};

#ifndef Q_WS_QPA
static QThreadStorage<QGLThreadContext *> qgl_context_storage;
#endif

Q_GLOBAL_STATIC(QGLFormat, qgl_default_format)

class QGLDefaultOverlayFormat: public QGLFormat
{
public:
    inline QGLDefaultOverlayFormat()
    {
        setOption(QGL::FormatOption(0xffff << 16)); // turn off all options
        setOption(QGL::DirectRendering);
        setPlane(1);
    }
};
Q_GLOBAL_STATIC(QGLDefaultOverlayFormat, defaultOverlayFormatInstance)

Q_GLOBAL_STATIC(QGLSignalProxy, theSignalProxy)
QGLSignalProxy *QGLSignalProxy::instance()
{
    QGLSignalProxy *proxy = theSignalProxy();
    if (proxy && proxy->thread() != qApp->thread()) {
        if (proxy->thread() == QThread::currentThread())
            proxy->moveToThread(qApp->thread());
    }
    return proxy;
}


class QGLEngineSelector
{
public:
    QGLEngineSelector() : engineType(QPaintEngine::MaxUser)
    {
    }

    void setPreferredPaintEngine(QPaintEngine::Type type) {
        if (type == QPaintEngine::OpenGL || type == QPaintEngine::OpenGL2)
            engineType = type;
    }

    QPaintEngine::Type preferredPaintEngine() {
#ifdef Q_WS_MAC
        // The ATI X1600 driver for Mac OS X does not support return
        // values from functions in GLSL. Since working around this in
        // the GL2 engine would require a big, ugly rewrite, we're
        // falling back to the GL 1 engine..
        static bool mac_x1600_check_done = false;
        if (!mac_x1600_check_done) {
            QGLTemporaryContext *tmp = 0;
            if (!QGLContext::currentContext())
                tmp = new QGLTemporaryContext();
            if (strstr((char *) glGetString(GL_RENDERER), "X1600"))
                engineType = QPaintEngine::OpenGL;
            if (tmp)
                delete tmp;
            mac_x1600_check_done = true;
        }
#endif
        if (engineType == QPaintEngine::MaxUser) {
            // No user-set engine - use the defaults
#if defined(QT_OPENGL_ES_2)
            engineType = QPaintEngine::OpenGL2;
#else
            // We can't do this in the constructor for this object because it
            // needs to be called *before* the QApplication constructor.
            // Also check for the FragmentShader extension in conjunction with
            // the 2.0 version flag, to cover the case where we export the display
            // from an old GL 1.1 server to a GL 2.x client. In that case we can't
            // use GL 2.0.
            if ((QGLFormat::openGLVersionFlags() & QGLFormat::OpenGL_Version_2_0)
                && (QGLExtensions::glExtensions() & QGLExtensions::FragmentShader)
                && qgetenv("QT_GL_USE_OPENGL1ENGINE").isEmpty())
                engineType = QPaintEngine::OpenGL2;
            else
                engineType = QPaintEngine::OpenGL;
#endif
        }
        return engineType;
    }

private:
    QPaintEngine::Type engineType;
};

Q_GLOBAL_STATIC(QGLEngineSelector, qgl_engine_selector)


bool qt_gl_preferGL2Engine()
{
    return qgl_engine_selector()->preferredPaintEngine() == QPaintEngine::OpenGL2;
}


void QGL::setPreferredPaintEngine(QPaintEngine::Type engineType)
{
    qgl_engine_selector()->setPreferredPaintEngine(engineType);
}


/*****************************************************************************
  QGLFormat implementation
 *****************************************************************************/


#ifndef QT_OPENGL_ES

static inline void transform_point(GLdouble out[4], const GLdouble m[16], const GLdouble in[4])
{
#if defined(Q_CC_GNU) && (__GNUC__ * 100 + __GNUC_MINOR__ >= 406)
# pragma GCC diagnostic push
# pragma GCC diagnostic ignored "-Warray-bounds"
#endif
#define M(row,col)  m[col*4+row]
    out[0] =
        M(0, 0) * in[0] + M(0, 1) * in[1] + M(0, 2) * in[2] + M(0, 3) * in[3];
    out[1] =
        M(1, 0) * in[0] + M(1, 1) * in[1] + M(1, 2) * in[2] + M(1, 3) * in[3];
    out[2] =
        M(2, 0) * in[0] + M(2, 1) * in[1] + M(2, 2) * in[2] + M(2, 3) * in[3];
    out[3] =
        M(3, 0) * in[0] + M(3, 1) * in[1] + M(3, 2) * in[2] + M(3, 3) * in[3];
#undef M
#if defined(Q_CC_GNU) && (__GNUC__ * 100 + __GNUC_MINOR__ >= 406)
# pragma GCC diagnostic pop
#endif
}

static inline GLint qgluProject(GLdouble objx, GLdouble objy, GLdouble objz,
           const GLdouble model[16], const GLdouble proj[16],
           const GLint viewport[4],
           GLdouble * winx, GLdouble * winy, GLdouble * winz)
{
   GLdouble in[4], out[4];

   in[0] = objx;
   in[1] = objy;
   in[2] = objz;
   in[3] = 1.0;
   transform_point(out, model, in);
   transform_point(in, proj, out);

   if (in[3] == 0.0)
      return GL_FALSE;

   in[0] /= in[3];
   in[1] /= in[3];
   in[2] /= in[3];

   *winx = viewport[0] + (1 + in[0]) * viewport[2] / 2;
   *winy = viewport[1] + (1 + in[1]) * viewport[3] / 2;

   *winz = (1 + in[2]) / 2;
   return GL_TRUE;
}

#endif // !QT_OPENGL_ES

QGLFormat::QGLFormat()
{
    d = new QGLFormatPrivate;
}


QGLFormat::QGLFormat(QGL::FormatOptions options, int plane)
{
    d = new QGLFormatPrivate;
    QGL::FormatOptions newOpts = options;
    d->opts = defaultFormat().d->opts;
    d->opts |= (newOpts & 0xffff);
    d->opts &= ~(newOpts >> 16);
    d->pln = plane;
}

void QGLFormat::detach()
{
    if (d->ref != 1) {
        QGLFormatPrivate *newd = new QGLFormatPrivate(d);
        if (!d->ref.deref())
            delete d;
        d = newd;
    }
}

QGLFormat::QGLFormat(const QGLFormat &other)
{
    d = other.d;
    d->ref.ref();
}

QGLFormat &QGLFormat::operator=(const QGLFormat &other)
{
    if (d != other.d) {
        other.d->ref.ref();
        if (!d->ref.deref())
            delete d;
        d = other.d;
    }
    return *this;
}

QGLFormat::~QGLFormat()
{
    if (!d->ref.deref())
        delete d;
}

void QGLFormat::setDoubleBuffer(bool enable)
{
    setOption(enable ? QGL::DoubleBuffer : QGL::SingleBuffer);
}


void QGLFormat::setDepth(bool enable)
{
    setOption(enable ? QGL::DepthBuffer : QGL::NoDepthBuffer);
}


void QGLFormat::setRgba(bool enable)
{
    setOption(enable ? QGL::Rgba : QGL::ColorIndex);
}


void QGLFormat::setAlpha(bool enable)
{
    setOption(enable ? QGL::AlphaChannel : QGL::NoAlphaChannel);
}


void QGLFormat::setAccum(bool enable)
{
    setOption(enable ? QGL::AccumBuffer : QGL::NoAccumBuffer);
}


void QGLFormat::setStencil(bool enable)
{
    setOption(enable ? QGL::StencilBuffer: QGL::NoStencilBuffer);
}


void QGLFormat::setStereo(bool enable)
{
    setOption(enable ? QGL::StereoBuffers : QGL::NoStereoBuffers);
}


void QGLFormat::setDirectRendering(bool enable)
{
    setOption(enable ? QGL::DirectRendering : QGL::IndirectRendering);
}

void QGLFormat::setSampleBuffers(bool enable)
{
    setOption(enable ? QGL::SampleBuffers : QGL::NoSampleBuffers);
}

int QGLFormat::samples() const
{
   return d->numSamples;
}

void QGLFormat::setSamples(int numSamples)
{
    detach();
    if (numSamples < 0) {
        qWarning("QGLFormat::setSamples: Cannot have negative number of samples per pixel %d", numSamples);
        return;
    }
    d->numSamples = numSamples;
    setSampleBuffers(numSamples > 0);
}

void QGLFormat::setSwapInterval(int interval)
{
    detach();
    d->swapInterval = interval;
}

int QGLFormat::swapInterval() const
{
    return d->swapInterval;
}

void QGLFormat::setOverlay(bool enable)
{
    setOption(enable ? QGL::HasOverlay : QGL::NoOverlay);
}

int QGLFormat::plane() const
{
    return d->pln;
}

void QGLFormat::setPlane(int plane)
{
    detach();
    d->pln = plane;
}

void QGLFormat::setOption(QGL::FormatOptions opt)
{
    detach();
    if (opt & 0xffff)
        d->opts |= opt;
    else
       d->opts &= ~(opt >> 16);
}



bool QGLFormat::testOption(QGL::FormatOptions opt) const
{
    if (opt & 0xffff)
       return (d->opts & opt) != 0;
    else
       return (d->opts & (opt >> 16)) == 0;
}

void QGLFormat::setDepthBufferSize(int size)
{
    detach();
    if (size < 0) {
        qWarning("QGLFormat::setDepthBufferSize: Cannot set negative depth buffer size %d", size);
        return;
    }
    d->depthSize = size;
    setDepth(size > 0);
}

int QGLFormat::depthBufferSize() const
{
   return d->depthSize;
}

void QGLFormat::setRedBufferSize(int size)
{
    detach();
    if (size < 0) {
        qWarning("QGLFormat::setRedBufferSize: Cannot set negative red buffer size %d", size);
        return;
    }
    d->redSize = size;
}

int QGLFormat::redBufferSize() const
{
   return d->redSize;
}

void QGLFormat::setGreenBufferSize(int size)
{
    detach();
    if (size < 0) {
        qWarning("QGLFormat::setGreenBufferSize: Cannot set negative green buffer size %d", size);
        return;
    }
    d->greenSize = size;
}

int QGLFormat::greenBufferSize() const
{
   return d->greenSize;
}

void QGLFormat::setBlueBufferSize(int size)
{
    detach();
    if (size < 0) {
        qWarning("QGLFormat::setBlueBufferSize: Cannot set negative blue buffer size %d", size);
        return;
    }
    d->blueSize = size;
}

int QGLFormat::blueBufferSize() const
{
   return d->blueSize;
}

void QGLFormat::setAlphaBufferSize(int size)
{
    detach();
    if (size < 0) {
        qWarning("QGLFormat::setAlphaBufferSize: Cannot set negative alpha buffer size %d", size);
        return;
    }
    d->alphaSize = size;
    setAlpha(size > 0);
}

int QGLFormat::alphaBufferSize() const
{
   return d->alphaSize;
}

void QGLFormat::setAccumBufferSize(int size)
{
    detach();
    if (size < 0) {
        qWarning("QGLFormat::setAccumBufferSize: Cannot set negative accumulate buffer size %d", size);
        return;
    }
    d->accumSize = size;
    setAccum(size > 0);
}

int QGLFormat::accumBufferSize() const
{
   return d->accumSize;
}

void QGLFormat::setStencilBufferSize(int size)
{
    detach();
    if (size < 0) {
        qWarning("QGLFormat::setStencilBufferSize: Cannot set negative stencil buffer size %d", size);
        return;
    }
    d->stencilSize = size;
    setStencil(size > 0);
}

int QGLFormat::stencilBufferSize() const
{
   return d->stencilSize;
}

void QGLFormat::setVersion(int major, int minor)
{
    if (major < 1 || minor < 0) {
        qWarning("QGLFormat::setVersion: Cannot set zero or negative version number %d.%d", major, minor);
        return;
    }
    detach();
    d->majorVersion = major;
    d->minorVersion = minor;
}

int QGLFormat::majorVersion() const
{
    return d->majorVersion;
}

int QGLFormat::minorVersion() const
{
    return d->minorVersion;
}

void QGLFormat::setProfile(OpenGLContextProfile profile)
{
    detach();
    d->profile = profile;
}

QGLFormat::OpenGLContextProfile QGLFormat::profile() const
{
    return d->profile;
}


QGLFormat::OpenGLVersionFlags Q_AUTOTEST_EXPORT qOpenGLVersionFlagsFromString(const QString &versionString)
{
    QGLFormat::OpenGLVersionFlags versionFlags = QGLFormat::OpenGL_Version_None;

    if (versionString.startsWith(QLatin1String("OpenGL ES"))) {
        QStringList parts = versionString.split(QLatin1Char(' '));
        if (parts.size() >= 3) {
            if (parts[2].startsWith(QLatin1String("1."))) {
                if (parts[1].endsWith(QLatin1String("-CM"))) {
                    versionFlags |= QGLFormat::OpenGL_ES_Common_Version_1_0 |
                                    QGLFormat::OpenGL_ES_CommonLite_Version_1_0;
                    if (parts[2].startsWith(QLatin1String("1.1")))
                        versionFlags |= QGLFormat::OpenGL_ES_Common_Version_1_1 |
                                        QGLFormat::OpenGL_ES_CommonLite_Version_1_1;
                } else {
                    // Not -CM, must be CL, CommonLite
                    versionFlags |= QGLFormat::OpenGL_ES_CommonLite_Version_1_0;
                    if (parts[2].startsWith(QLatin1String("1.1")))
                        versionFlags |= QGLFormat::OpenGL_ES_CommonLite_Version_1_1;
                }
            } else {
                // OpenGL ES version 2.0 or higher
                versionFlags |= QGLFormat::OpenGL_ES_Version_2_0;
            }
        } else {
            // if < 3 parts to the name, it is an unrecognised OpenGL ES
            qWarning("Unrecognised OpenGL ES version");
        }
    } else {
        // not ES, regular OpenGL, the version numbers are first in the string
        if (versionString.startsWith(QLatin1String("1."))) {
            switch (versionString[2].toAscii()) {
            case '5':
                versionFlags |= QGLFormat::OpenGL_Version_1_5;
            case '4':
                versionFlags |= QGLFormat::OpenGL_Version_1_4;
            case '3':
                versionFlags |= QGLFormat::OpenGL_Version_1_3;
            case '2':
                versionFlags |= QGLFormat::OpenGL_Version_1_2;
            case '1':
                versionFlags |= QGLFormat::OpenGL_Version_1_1;
            default:
                break;
            }
        } else if (versionString.startsWith(QLatin1String("2."))) {
            versionFlags |= QGLFormat::OpenGL_Version_1_1 |
                            QGLFormat::OpenGL_Version_1_2 |
                            QGLFormat::OpenGL_Version_1_3 |
                            QGLFormat::OpenGL_Version_1_4 |
                            QGLFormat::OpenGL_Version_1_5 |
                            QGLFormat::OpenGL_Version_2_0;
            if (versionString[2].toAscii() == '1')
                versionFlags |= QGLFormat::OpenGL_Version_2_1;
        } else if (versionString.startsWith(QLatin1String("3."))) {
            versionFlags |= QGLFormat::OpenGL_Version_1_1 |
                            QGLFormat::OpenGL_Version_1_2 |
                            QGLFormat::OpenGL_Version_1_3 |
                            QGLFormat::OpenGL_Version_1_4 |
                            QGLFormat::OpenGL_Version_1_5 |
                            QGLFormat::OpenGL_Version_2_0 |
                            QGLFormat::OpenGL_Version_2_1 |
                            QGLFormat::OpenGL_Version_3_0;
            switch (versionString[2].toAscii()) {
            case '3':
                versionFlags |= QGLFormat::OpenGL_Version_3_3;
            case '2':
                versionFlags |= QGLFormat::OpenGL_Version_3_2;
            case '1':
                versionFlags |= QGLFormat::OpenGL_Version_3_1;
            case '0':
                break;
            default:
                versionFlags |= QGLFormat::OpenGL_Version_3_1 |
                                QGLFormat::OpenGL_Version_3_2 |
                                QGLFormat::OpenGL_Version_3_3;
                break;
            }
        } else if (versionString.startsWith(QLatin1String("4."))) {
            versionFlags |= QGLFormat::OpenGL_Version_1_1 |
                            QGLFormat::OpenGL_Version_1_2 |
                            QGLFormat::OpenGL_Version_1_3 |
                            QGLFormat::OpenGL_Version_1_4 |
                            QGLFormat::OpenGL_Version_1_5 |
                            QGLFormat::OpenGL_Version_2_0 |
                            QGLFormat::OpenGL_Version_2_1 |
                            QGLFormat::OpenGL_Version_3_0 |
                            QGLFormat::OpenGL_Version_3_1 |
                            QGLFormat::OpenGL_Version_3_2 |
                            QGLFormat::OpenGL_Version_3_3 |
                            QGLFormat::OpenGL_Version_4_0;
        } else {
            versionFlags |= QGLFormat::OpenGL_Version_1_1 |
                            QGLFormat::OpenGL_Version_1_2 |
                            QGLFormat::OpenGL_Version_1_3 |
                            QGLFormat::OpenGL_Version_1_4 |
                            QGLFormat::OpenGL_Version_1_5 |
                            QGLFormat::OpenGL_Version_2_0 |
                            QGLFormat::OpenGL_Version_2_1 |
                            QGLFormat::OpenGL_Version_3_0 |
                            QGLFormat::OpenGL_Version_3_1 |
                            QGLFormat::OpenGL_Version_3_2 |
                            QGLFormat::OpenGL_Version_3_3 |
                            QGLFormat::OpenGL_Version_4_0;
        }
    }
    return versionFlags;
}

---

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