qdirectfb_egl.cpp

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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
#include "qdirectfb_egl.h"
#include "qdirectfbwindow.h"
#include "qdirectfbscreen.h"
#include "qdirectfbeglhooks.h"
 
#include <QtGui/QOpenGLContext>
#include <qpa/qplatformopenglcontext.h>
#include <qpa/qwindowsysteminterface.h>
#include <QtGui/QScreen>
 
#include <QtGui/private/qeglplatformcontext_p.h>
#include <QtGui/private/qeglconvenience_p.h>
 
#include <QtGui/private/qt_egl_p.h>
 
QT_BEGIN_NAMESPACE
 
#ifdef DIRECTFB_PLATFORM_HOOKS
extern QDirectFBEGLHooks platform_hook;
static QDirectFBEGLHooks *hooks = &platform_hook;
#else
static QDirectFBEGLHooks *hooks = nullptr;
#endif
 
class QDirectFbScreenEGL : public QDirectFbScreen {
public:
    QDirectFbScreenEGL(int display);
    ~QDirectFbScreenEGL();
 
    // EGL helper
    EGLDisplay eglDisplay();
 
private:
    void initializeEGL();
    void platformInit();
    void platformDestroy();
 
private:
    EGLDisplay m_eglDisplay;
};
 
class QDirectFbWindowEGL : public QDirectFbWindow {
public:
    QDirectFbWindowEGL(QWindow *tlw, QDirectFbInput *inputhandler);
    ~QDirectFbWindowEGL();
 
    void createDirectFBWindow();
 
    // EGL. Subclass it instead to have different GL integrations?
    EGLSurface eglSurface();
 
    QSurfaceFormat format() const;
 
private:
    EGLSurface m_eglSurface;
};
 
class QDirectFbEGLContext : public QEGLPlatformContext {
public:
    QDirectFbEGLContext(QDirectFbScreenEGL *screen, QOpenGLContext *context);
 
protected:
    EGLSurface eglSurfaceForPlatformSurface(QPlatformSurface *surface);
 
private:
    QDirectFbScreen *m_screen;
};
 
QDirectFbScreenEGL::QDirectFbScreenEGL(int display)
    : QDirectFbScreen(display)
    , m_eglDisplay(EGL_NO_DISPLAY)
{}
 
QDirectFbScreenEGL::~QDirectFbScreenEGL()
{
    platformDestroy();
}
 
EGLDisplay QDirectFbScreenEGL::eglDisplay()
{
    if (m_eglDisplay == EGL_NO_DISPLAY)
        initializeEGL();
    return m_eglDisplay;
}
 
void QDirectFbScreenEGL::initializeEGL()
{
    m_eglDisplay = eglGetDisplay(EGL_DEFAULT_DISPLAY);
    if (m_eglDisplay == EGL_NO_DISPLAY)
        return;
 
    platformInit();
 
    EGLint major, minor;
    eglBindAPI(EGL_OPENGL_ES_API);
    eglInitialize(m_eglDisplay, &major, &minor);
    return;
}
 
void QDirectFbScreenEGL::platformInit()
{
    if (hooks)
        hooks->platformInit();
}
 
void QDirectFbScreenEGL::platformDestroy()
{
    if (hooks)
        hooks->platformDestroy();
}
 
QDirectFbWindowEGL::QDirectFbWindowEGL(QWindow *tlw, QDirectFbInput *input)
    : QDirectFbWindow(tlw, input)
    , m_eglSurface(EGL_NO_SURFACE)
{}
 
QDirectFbWindowEGL::~QDirectFbWindowEGL()
{
    if (m_eglSurface != EGL_NO_SURFACE) {
        QDirectFbScreenEGL *dfbScreen;
        dfbScreen = static_cast<QDirectFbScreenEGL*>(screen());
        eglDestroySurface(dfbScreen->eglDisplay(), m_eglSurface);
    }
}
 
void QDirectFbWindowEGL::createDirectFBWindow()
{
    // Use the default for the raster surface.
    if (window()->surfaceType() == QSurface::RasterSurface)
        return QDirectFbWindow::createDirectFBWindow();
 
    Q_ASSERT(!m_dfbWindow.data());
 
    DFBWindowDescription description;
    memset(&description, 0, sizeof(DFBWindowDescription));
    description.flags = DFBWindowDescriptionFlags(DWDESC_WIDTH | DWDESC_HEIGHT|
                                                  DWDESC_POSX | DWDESC_POSY|
                                                  DWDESC_PIXELFORMAT | DWDESC_SURFACE_CAPS);
    description.width = qMax(1, window()->width());
    description.height = qMax(1, window()->height());
    description.posx = window()->x();
    description.posy = window()->y();
 
    description.surface_caps = DSCAPS_GL;
    description.pixelformat = DSPF_RGB16;
 
    IDirectFBDisplayLayer *layer;
    layer = toDfbScreen(window())->dfbLayer();
    DFBResult result = layer->CreateWindow(layer, &description, m_dfbWindow.outPtr());
    if (result != DFB_OK)
        DirectFBError("QDirectFbWindow: failed to create window", result);
 
    m_dfbWindow->SetOpacity(m_dfbWindow.data(), 0xff);
    m_inputHandler->addWindow(m_dfbWindow.data(), window());
}
 
EGLSurface QDirectFbWindowEGL::eglSurface()
{
    if (m_eglSurface == EGL_NO_SURFACE) {
        QDirectFbScreenEGL *dfbScreen = static_cast<QDirectFbScreenEGL *>(screen());
        EGLConfig config = q_configFromGLFormat(dfbScreen->eglDisplay(), format(), true);
        m_eglSurface = eglCreateWindowSurface(dfbScreen->eglDisplay(), config, dfbSurface(), NULL);
 
        if (m_eglSurface == EGL_NO_SURFACE)
            eglGetError();
    }
 
    return m_eglSurface;
}
 
QSurfaceFormat QDirectFbWindowEGL::format() const
{
    return window()->requestedFormat();
}
 
 
QDirectFbEGLContext::QDirectFbEGLContext(QDirectFbScreenEGL *screen, QOpenGLContext *context)
    : QEGLPlatformContext(context->format(), context->shareHandle(), screen->eglDisplay())
    , m_screen(screen)
{}
 
EGLSurface QDirectFbEGLContext::eglSurfaceForPlatformSurface(QPlatformSurface *surface)
{
    QDirectFbWindowEGL *window = static_cast<QDirectFbWindowEGL*>(surface);
    return window->eglSurface();
}
 
QPlatformWindow *QDirectFbIntegrationEGL::createPlatformWindow(QWindow *window) const
{
    QDirectFbWindow *dfbWindow = new QDirectFbWindowEGL(window, m_input.data());
    dfbWindow->createDirectFBWindow();
    return dfbWindow;
}
 
QPlatformOpenGLContext *QDirectFbIntegrationEGL::createPlatformOpenGLContext(QOpenGLContext *context) const
{
    QDirectFbScreenEGL *screen;
    screen = static_cast<QDirectFbScreenEGL*>(context->screen()->handle());
    return new QDirectFbEGLContext(screen, context);
}
 
void QDirectFbIntegrationEGL::initializeScreen()
{
    m_primaryScreen.reset(new QDirectFbScreenEGL(0));
    QWindowSystemInterface::handleScreenAdded(m_primaryScreen.data());
}
 
bool QDirectFbIntegrationEGL::hasCapability(QPlatformIntegration::Capability cap) const
{
    // We assume that devices will have more and not less capabilities
    if (hooks && hooks->hasCapability(cap))
        return true;
    return QDirectFbIntegration::hasCapability(cap);
}
 
QT_END_NAMESPACE