/****************************************************************************

**

** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).

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** Contact: Nokia Corporation (qt-info@nokia.com)

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** This file is part of the QtOpenGL module of the Qt Toolkit.

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** this package.

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****************************************************************************/

#include "qgl.h"

#include <private/qt_x11_p.h>

#include <private/qpixmap_x11_p.h>

#include <private/qgl_p.h>

#include <private/qpaintengine_opengl_p.h>

#include "qgl_egl_p.h"

#include "qcolormap.h"

#include <QDebug>

QT_BEGIN_NAMESPACE

bool QGLFormat::hasOpenGLOverlays()

{

    return false;

}

void qt_egl_add_platform_config(QEglProperties& props, QPaintDevice *device)

{

    if (device->devType() == QInternal::Image)

        props.setPixelFormat(static_cast<QImage *>(device)->format());

}

bool QGLContext::chooseContext(const QGLContext* shareContext)

{

    Q_D(QGLContext);

    if (!device())

        return false;

    int devType = device()->devType();

    // Get the display and initialize it.

    d->eglContext = new QEglContext();

    d->eglContext->setApi(QEgl::OpenGL);

    if (!d->eglContext->openDisplay(device())) {

        delete d->eglContext;

        d->eglContext = 0;

        return false;

    }

    // Construct the configuration we need for this surface.

    QEglProperties configProps;

    qt_egl_set_format(configProps, devType, d->glFormat);

    qt_egl_add_platform_config(configProps, device());

    configProps.setRenderableType(QEgl::OpenGL);

    QEgl::PixelFormatMatch matchType = QEgl::BestPixelFormat;

    if (device()->depth() == 16) {

        configProps.setValue(EGL_RED_SIZE, 5);

        configProps.setValue(EGL_GREEN_SIZE, 6);

        configProps.setValue(EGL_BLUE_SIZE, 5);

        configProps.setValue(EGL_ALPHA_SIZE, 0);

        matchType = QEgl::ExactPixelFormat;

    }

    configProps.setRenderableType(QEgl::OpenGL);

    // Search for a matching configuration, reducing the complexity

    // each time until we get something that matches.

    if (!d->eglContext->chooseConfig(configProps, matchType)) {

        delete d->eglContext;

        d->eglContext = 0;

        return false;

    }

    // Inform the higher layers about the actual format properties.

    qt_egl_update_format(*(d->eglContext), d->glFormat);

    // Create a new context for the configuration.

    if (!d->eglContext->createContext

            (shareContext ? shareContext->d_func()->eglContext : 0)) {

        delete d->eglContext;

        d->eglContext = 0;

        return false;

    }

#if defined(EGL_VERSION_1_1)

    if (d->glFormat.swapInterval() != -1 && devType == QInternal::Widget)

        eglSwapInterval(d->eglContext->display(), d->glFormat.swapInterval());

#endif

    return true;

}

void QGLWidget::resizeEvent(QResizeEvent *)

{

    Q_D(QGLWidget);

    if (!isValid())

        return;

    makeCurrent();

    if (!d->glcx->initialized())

        glInit();

    resizeGL(width(), height());

    //handle overlay

}

const QGLContext* QGLWidget::overlayContext() const

{

    return 0;

}

void QGLWidget::makeOverlayCurrent()

{

    //handle overlay

}

void QGLWidget::updateOverlayGL()

{

    //handle overlay

}

bool qt_egl_setup_x11_visual(XVisualInfo &vi, EGLDisplay display, EGLConfig config, const QX11Info &x11Info, bool useArgbVisual)

{

    bool foundVisualIsArgb = useArgbVisual;

    memset(&vi, 0, sizeof(XVisualInfo));

    // Check to see if EGL is suggesting an appropriate visual id:

    EGLint nativeVisualId;

    eglGetConfigAttrib(display, config, EGL_NATIVE_VISUAL_ID, &nativeVisualId);

    vi.visualid = nativeVisualId;

    if (vi.visualid) {

        // EGL has suggested a visual id, so get the rest of the visual info for that id:

        XVisualInfo *chosenVisualInfo;

        int matchingCount = 0;

        chosenVisualInfo = XGetVisualInfo(x11Info.display(), VisualIDMask, &vi, &matchingCount);

        if (chosenVisualInfo) {

#if !defined(QT_NO_XRENDER)

            if (useArgbVisual) {

                // Check to make sure the visual provided by EGL is ARGB

                XRenderPictFormat *format;

                format = XRenderFindVisualFormat(x11Info.display(), chosenVisualInfo->visual);

                if (format->type == PictTypeDirect && format->direct.alphaMask) {

//                    qDebug("Using ARGB X Visual ID (%d) provided by EGL", (int)vi.visualid);

                    foundVisualIsArgb = true;

                    vi = *chosenVisualInfo;

                }

                else {

                    qWarning("Warning: EGL suggested using X visual ID %d for config %d, but this is not ARGB",

                             nativeVisualId, (int)config);

                    vi.visualid = 0;

                }

            } else

#endif

            {

//                qDebug("Using opaque X Visual ID (%d) provided by EGL", (int)vi.visualid);

                vi = *chosenVisualInfo;

            }

            XFree(chosenVisualInfo);

        }

        else {

            qWarning("Warning: EGL suggested using X visual ID %d for config %d, but this seems to be invalid!",

                     nativeVisualId, (int)config);

            vi.visualid = 0;

        }

    }

    // If EGL does not know the visual ID, so try to select an appropriate one ourselves, first

    // using XRender if we're supposed to have an alpha, then falling back to XGetVisualInfo

#if !defined(QT_NO_XRENDER)

    if (vi.visualid == 0 && useArgbVisual) {

        // Try to use XRender to find an ARGB visual we can use

        vi.screen  = x11Info.screen();

        vi.depth   = 32; //### We might at some point (soon) get ARGB4444

        vi.c_class = TrueColor;

        XVisualInfo *matchingVisuals;

        int matchingCount = 0;

        matchingVisuals = XGetVisualInfo(x11Info.display(),

                                         VisualScreenMask|VisualDepthMask|VisualClassMask,

                                         &vi, &matchingCount);

        for (int i = 0; i < matchingCount; ++i) {

            XRenderPictFormat *format;

            format = XRenderFindVisualFormat(x11Info.display(), matchingVisuals[i].visual);

            if (format->type == PictTypeDirect && format->direct.alphaMask) {

                vi = matchingVisuals[i];

                foundVisualIsArgb = true;

//                qDebug("Using X Visual ID (%d) for ARGB visual as provided by XRender", (int)vi.visualid);

                break;

            }

        }

        XFree(matchingVisuals);

    }

#endif

    if (vi.visualid == 0) {

        EGLint depth;

        eglGetConfigAttrib(display, config, EGL_BUFFER_SIZE, &depth);

        int err;

        err = XMatchVisualInfo(x11Info.display(), x11Info.screen(), depth, TrueColor, &vi);

        if (err == 0) {

            qWarning("Warning: Can't find an X visual which matches the EGL config(%d)'s depth (%d)!",

                     (int)config, depth);

            depth = x11Info.depth();

            err = XMatchVisualInfo(x11Info.display(), x11Info.screen(), depth, TrueColor, &vi);

            if (err == 0) {

                qWarning("Error: Couldn't get any matching X visual!");

                return false;

            } else

                qWarning("         - Falling back to X11 suggested depth (%d)", depth);

        }

//        else

//            qDebug("Using X Visual ID (%d) for EGL provided depth (%d)", (int)vi.visualid, depth);

        // Don't try to use ARGB now unless the visual is 32-bit - even then it might stil fail :-(

        if (useArgbVisual)

            foundVisualIsArgb = vi.depth == 32; //### We might at some point (soon) get ARGB4444

    }

//    qDebug("Visual Info:");

//    qDebug("   bits_per_rgb=%d", vi.bits_per_rgb);

//    qDebug("   red_mask=0x%x", vi.red_mask);

//    qDebug("   green_mask=0x%x", vi.green_mask);

//    qDebug("   blue_mask=0x%x", vi.blue_mask);

//    qDebug("   colormap_size=%d", vi.colormap_size);

//    qDebug("   c_class=%d", vi.c_class);

//    qDebug("   depth=%d", vi.depth);

//    qDebug("   screen=%d", vi.screen);

//    qDebug("   visualid=%d", vi.visualid);

    return foundVisualIsArgb;

}

void QGLWidget::setContext(QGLContext *context, const QGLContext* shareContext, bool deleteOldContext)

{

    Q_D(QGLWidget);

    if (context == 0) {

        qWarning("QGLWidget::setContext: Cannot set null context");

        return;

    }

    if (!context->deviceIsPixmap() && context->device() != this) {

        qWarning("QGLWidget::setContext: Context must refer to this widget");

        return;

    }

    if (d->glcx)

        d->glcx->doneCurrent();

    QGLContext* oldcx = d->glcx;

    d->glcx = context;

    if (parentWidget()) {

        // force creation of delay-created widgets

        parentWidget()->winId();

        if (parentWidget()->x11Info().screen() != x11Info().screen())

            d_func()->xinfo = parentWidget()->d_func()->xinfo;

    }

    // If the application has set WA_TranslucentBackground and not explicitly set

    // the alpha buffer size to zero, modify the format so it have an alpha channel

    QGLFormat& fmt = d->glcx->d_func()->glFormat;

    const bool tryArgbVisual = testAttribute(Qt::WA_TranslucentBackground);

    if (tryArgbVisual && fmt.alphaBufferSize() == -1)

        fmt.setAlphaBufferSize(1);

    bool createFailed = false;

    if (!d->glcx->isValid()) {

        if (!d->glcx->create(shareContext ? shareContext : oldcx))

            createFailed = true;

    }

    if (createFailed) {

        if (deleteOldContext)

            delete oldcx;

        return;

    }

    if (d->glcx->windowCreated() || d->glcx->deviceIsPixmap()) {

        if (deleteOldContext)

            delete oldcx;

        return;

    }

    bool visible = isVisible();

    if (visible)

        hide();

    XVisualInfo vi;

    QEglContext *eglContext = d->glcx->d_func()->eglContext;

    bool usingArgbVisual = qt_egl_setup_x11_visual(vi, eglContext->display(), eglContext->config(),

                                                   x11Info(), tryArgbVisual);

    XSetWindowAttributes a;

    Window p = RootWindow(x11Info().display(), x11Info().screen());

    if (parentWidget())

        p = parentWidget()->winId();

    QColormap colmap = QColormap::instance(vi.screen);

    a.background_pixel = colmap.pixel(palette().color(backgroundRole()));

    a.border_pixel = colmap.pixel(Qt::black);

    unsigned int valueMask = CWBackPixel|CWBorderPixel;

    if (usingArgbVisual) {

        a.colormap = XCreateColormap(x11Info().display(), p, vi.visual, AllocNone);

        valueMask |= CWColormap;

    }

    Window w = XCreateWindow(x11Info().display(), p, x(), y(), width(), height(),

                             0, vi.depth, InputOutput, vi.visual, valueMask, &a);

    if (deleteOldContext)

        delete oldcx;

    oldcx = 0;

    create(w); // Create with the ID of the window we've just created

    // Create the EGL surface to draw into.

    QGLContextPrivate *ctxpriv = d->glcx->d_func();

    ctxpriv->eglSurface = ctxpriv->eglContext->createSurface(this);

    if (ctxpriv->eglSurface == EGL_NO_SURFACE) {

        delete ctxpriv->eglContext;

        ctxpriv->eglContext = 0;

        return;

    }

    d->eglSurfaceWindowId = w; // Remember the window id we created the surface for

    if (visible)

        show();

    XFlush(X11->display);

    d->glcx->setWindowCreated(true);

}

void QGLWidgetPrivate::init(QGLContext *context, const QGLWidget* shareWidget)

{

    Q_Q(QGLWidget);

    initContext(context, shareWidget);

    if(q->isValid() && glcx->format().hasOverlay()) {

        //no overlay

        qWarning("QtOpenGL ES doesn't currently support overlays");

    }

}

void QGLWidgetPrivate::cleanupColormaps()

{

}

const QGLColormap & QGLWidget::colormap() const

{

    return d_func()->cmap;

}

void QGLWidget::setColormap(const QGLColormap &)

{

}

void QGLExtensions::init()

{

    static bool init_done = false;

    if (init_done)

        return;

    init_done = true;

    // We need a context current to initialize the extensions.

    QGLWidget tmpWidget;

    tmpWidget.makeCurrent();

    init_extensions();

    tmpWidget.doneCurrent();

}

// Re-creates the EGL surface if the window ID has changed or if force is true

void QGLWidgetPrivate::recreateEglSurface(bool force)

{

    Q_Q(QGLWidget);

    Window currentId = q->winId();

    if ( force || (currentId != eglSurfaceWindowId) ) {

        // The window id has changed so we need to re-create the EGL surface

        QEglContext *ctx = glcx->d_func()->eglContext;

        EGLSurface surface = glcx->d_func()->eglSurface;

        if (surface != EGL_NO_SURFACE)

            ctx->destroySurface(surface); // Will force doneCurrent() if nec.

        surface = ctx->createSurface(q);

        if (surface == EGL_NO_SURFACE)

            qWarning("Error creating EGL window surface: 0x%x", eglGetError());

        glcx->d_func()->eglSurface = surface;

        eglSurfaceWindowId = currentId;

    }

}

// Selects which configs should be used

EGLConfig Q_OPENGL_EXPORT qt_chooseEGLConfigForPixmap(bool hasAlpha, bool readOnly)

{

    // Cache the configs we select as they wont change:

    static EGLConfig roPixmapRGBConfig = 0;

    static EGLConfig roPixmapRGBAConfig = 0;

    static EGLConfig rwPixmapRGBConfig = 0;

    static EGLConfig rwPixmapRGBAConfig = 0;

    EGLConfig* targetConfig;

    if (hasAlpha) {

        if (readOnly)

            targetConfig = &roPixmapRGBAConfig;

        else

            targetConfig = &rwPixmapRGBAConfig;

    }

    else {

        if (readOnly)

            targetConfig = &roPixmapRGBConfig;

        else

            targetConfig = &rwPixmapRGBConfig;

    }

    if (*targetConfig == 0) {

        QEglProperties configAttribs;

        configAttribs.setValue(EGL_SURFACE_TYPE, EGL_PIXMAP_BIT);

        configAttribs.setRenderableType(QEgl::OpenGL);

        if (hasAlpha)

            configAttribs.setValue(EGL_BIND_TO_TEXTURE_RGBA, EGL_TRUE);

        else

            configAttribs.setValue(EGL_BIND_TO_TEXTURE_RGB, EGL_TRUE);

        // If this is going to be a render target, it needs to have a depth, stencil & sample buffer

        if (!readOnly) {

            configAttribs.setValue(EGL_DEPTH_SIZE, 1);

            configAttribs.setValue(EGL_STENCIL_SIZE, 1);

            configAttribs.setValue(EGL_SAMPLE_BUFFERS, 1);

        }

        EGLint configCount = 0;

        do {

            eglChooseConfig(QEglContext::defaultDisplay(0), configAttribs.properties(), targetConfig, 1, &configCount);

            if (configCount > 0) {

                // Got one

                qDebug() << "Found an" << (hasAlpha ? "ARGB" : "RGB") << (readOnly ? "readonly" : "target" )

                         << "config (" << int(*targetConfig) << ") to create a pixmap surface:";

//                QEglProperties configProps(*targetConfig);

//                qDebug() << configProps.toString();

                break;

            }

            qWarning("choosePixmapConfig() - No suitible config found, reducing requirements");

        } while (configAttribs.reduceConfiguration());

    }

    if (*targetConfig == 0)

        qWarning("choosePixmapConfig() - Couldn't find a suitable config");

    return *targetConfig;

}

bool Q_OPENGL_EXPORT qt_createEGLSurfaceForPixmap(QPixmapData* pmd, bool readOnly)

{

    Q_ASSERT(pmd->classId() == QPixmapData::X11Class);

    QX11PixmapData* pixmapData = static_cast<QX11PixmapData*>(pmd);

    bool hasAlpha = pixmapData->hasAlphaChannel();

    EGLConfig pixmapConfig = qt_chooseEGLConfigForPixmap(hasAlpha, readOnly);

    QEglProperties pixmapAttribs;

    // If the pixmap can't be bound to a texture, it's pretty useless

    pixmapAttribs.setValue(EGL_TEXTURE_TARGET, EGL_TEXTURE_2D);

    if (hasAlpha)

        pixmapAttribs.setValue(EGL_TEXTURE_FORMAT, EGL_TEXTURE_RGBA);

    else

        pixmapAttribs.setValue(EGL_TEXTURE_FORMAT, EGL_TEXTURE_RGB);

    EGLSurface pixmapSurface;

    pixmapSurface = eglCreatePixmapSurface(QEglContext::defaultDisplay(0),

                                           pixmapConfig,

                                           (EGLNativePixmapType) pixmapData->handle(),

                                           pixmapAttribs.properties());

//    qDebug("qt_createEGLSurfaceForPixmap() created surface 0x%x for pixmap 0x%x",

//           pixmapSurface, pixmapData->handle());

    if (pixmapSurface == EGL_NO_SURFACE) {

        qWarning() << "Failed to create a pixmap surface using config" << (int)pixmapConfig

                   << ":" << QEglContext::errorString(eglGetError());

        return false;

    }

    static bool doneOnce = false;

    if (!doneOnce) {

        // Make sure QGLTextureCache is instanciated so it can install cleanup hooks

        // which cleanup the EGL surface.

        QGLTextureCache::instance();