source: trunk/src/opengl/qpixmapdata_x11gl_egl.cpp@ 1040

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#include <QDebug>

#include <QtGui/private/qt_x11_p.h>
#include <QtGui/private/qegl_p.h>
#include <QtGui/private/qeglproperties_p.h>
#include <QtGui/private/qeglcontext_p.h>

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

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

#include <QtOpenGL/private/qgl_p.h>
#include <QtOpenGL/private/qgl_egl_p.h>

#include "qpixmapdata_x11gl_p.h"

QT_BEGIN_NAMESPACE


class QX11GLSharedContexts
{
public:
    QX11GLSharedContexts()
        : rgbContext(0)
        , argbContext(0)
        , sharedQGLContext(0)
        , sharePixmap(0)
    {
        EGLint rgbConfigId;
        EGLint argbConfigId;

        do {
            EGLConfig rgbConfig = QEgl::defaultConfig(QInternal::Pixmap, QEgl::OpenGL, QEgl::Renderable);
            EGLConfig argbConfig = QEgl::defaultConfig(QInternal::Pixmap, QEgl::OpenGL,
                                                       QEgl::Renderable | QEgl::Translucent);

            eglGetConfigAttrib(QEgl::display(), rgbConfig, EGL_CONFIG_ID, &rgbConfigId);
            eglGetConfigAttrib(QEgl::display(), argbConfig, EGL_CONFIG_ID, &argbConfigId);

            rgbContext = new QEglContext;
            rgbContext->setConfig(rgbConfig);
            rgbContext->createContext();

            if (!rgbContext->isValid())
                break;

            // If the RGB & ARGB configs are the same, use the same egl context for both:
            if (rgbConfig == argbConfig)
                argbContext = rgbContext;

            // Otherwise, create a separate context to be used for ARGB pixmaps:
            if (!argbContext) {
                argbContext = new QEglContext;
                argbContext->setConfig(argbConfig);
                bool success = argbContext->createContext(rgbContext);
                if (!success) {
                    qWarning("QX11GLPixmapData - RGB & ARGB contexts aren't shared");
                    success = argbContext->createContext();
                    if (!success)
                        argbContext = rgbContext; // Might work, worth a shot at least.
                }
            }

            if (!argbContext->isValid())
                break;

            // Create the pixmap which will be used to create the egl surface for the share QGLContext
            QX11PixmapData *rgbPixmapData = new QX11PixmapData(QPixmapData::PixmapType);
            rgbPixmapData->resize(8, 8);
            rgbPixmapData->fill(Qt::red);
            sharePixmap = new QPixmap(rgbPixmapData);
            EGLSurface sharePixmapSurface = QEgl::createSurface(sharePixmap, rgbConfig);
            rgbPixmapData->gl_surface = (void*)sharePixmapSurface;

            // Create the actual QGLContext which will be used for sharing
            sharedQGLContext = new QGLContext(QX11GLPixmapData::glFormat());
            sharedQGLContext->d_func()->eglContext = rgbContext;
            sharedQGLContext->d_func()->eglSurface = sharePixmapSurface;
            sharedQGLContext->d_func()->valid = true;
            qt_glformat_from_eglconfig(sharedQGLContext->d_func()->glFormat, rgbConfig);


            valid = rgbContext->makeCurrent(sharePixmapSurface);

            // If the ARGB & RGB configs are different, check ARGB works too:
            if (argbConfig != rgbConfig) {
                QX11PixmapData *argbPixmapData = new QX11PixmapData(QPixmapData::PixmapType);
                argbPixmapData->resize(8, 8);
                argbPixmapData->fill(Qt::transparent); // Force ARGB
                QPixmap argbPixmap(argbPixmapData); // destroys pixmap data when goes out of scope
                EGLSurface argbPixmapSurface = QEgl::createSurface(&argbPixmap, argbConfig);
                valid = argbContext->makeCurrent(argbPixmapSurface);
                argbContext->doneCurrent();
                eglDestroySurface(QEgl::display(), argbPixmapSurface);
                argbPixmapData->gl_surface = 0;
            }

            if (!valid) {
                qWarning() << "Unable to make pixmap surface current:" << QEgl::errorString();
                break;
            }

            // The pixmap surface destruction hooks are installed by QGLTextureCache, so we
            // must make sure this is instanciated:
            QGLTextureCache::instance();
        } while(0);

        if (!valid)
            cleanup();
        else
            qDebug("Using QX11GLPixmapData with EGL config %d for ARGB and config %d for RGB", argbConfigId, rgbConfigId);

    }

    ~QX11GLSharedContexts() {
        cleanup();
    }

    void cleanup() {
        if (sharedQGLContext) {
            delete sharedQGLContext;
            sharedQGLContext = 0;
        }
        if (argbContext && argbContext != rgbContext)
            delete argbContext;
        argbContext = 0;

        if (rgbContext) {
            delete rgbContext;
            rgbContext = 0;
        }

        // Deleting the QPixmap will fire the pixmap destruction cleanup hooks which in turn
        // will destroy the egl surface:
        if (sharePixmap) {
            delete sharePixmap;
            sharePixmap = 0;
        }
    }

    bool isValid() { return valid;}

    // On 16bpp systems, RGB & ARGB pixmaps are different bit-depths and therefore need
    // different contexts:
    QEglContext *rgbContext;
    QEglContext *argbContext;

    // The share context wraps the rgbContext and is used as the master of the context share
    // group. As all other contexts will have the same egl context (or a shared one if rgb != argb)
    // all QGLContexts will actually be sharing and can be in the same context group.
    QGLContext  *sharedQGLContext;
private:
    QPixmap     *sharePixmap;
    bool         valid;
};

static void qt_cleanup_x11gl_share_contexts();

Q_GLOBAL_STATIC_WITH_INITIALIZER(QX11GLSharedContexts, qt_x11gl_share_contexts,
                                 {
                                     qAddPostRoutine(qt_cleanup_x11gl_share_contexts);
                                 })

static void qt_cleanup_x11gl_share_contexts()
{
    qt_x11gl_share_contexts()->cleanup();
}


QX11GLSharedContexts* QX11GLPixmapData::sharedContexts()
{
    return qt_x11gl_share_contexts();
}

bool QX11GLPixmapData::hasX11GLPixmaps()
{
    static bool checkedForX11GLPixmaps = false;
    static bool haveX11GLPixmaps = false;

    if (checkedForX11GLPixmaps)
        return haveX11GLPixmaps;

    haveX11GLPixmaps = qt_x11gl_share_contexts()->isValid();
    checkedForX11GLPixmaps = true;

    return haveX11GLPixmaps;
}

QX11GLPixmapData::QX11GLPixmapData()
    : QX11PixmapData(QPixmapData::PixmapType),
      ctx(0)
{
}

QX11GLPixmapData::~QX11GLPixmapData()
{
    if (ctx)
        delete ctx;
}


void QX11GLPixmapData::fill(const QColor &color)
{
    if (ctx) {
        ctx->makeCurrent();
        glFinish();
        eglWaitClient();
    }