/****************************************************************************+
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**+
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** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).+
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** All rights reserved.+
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** Contact: Nokia Corporation (qt-info@nokia.com)+
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**+
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** This file is part of the QtOpenGL module of the Qt Toolkit.+
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**+
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** $QT_BEGIN_LICENSE:LGPL$+
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** No Commercial Usage+
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** This file contains pre-release code and may not be distributed.+
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** You may use this file in accordance with the terms and conditions+
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** contained in the Technology Preview License Agreement accompanying+
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** this package.+
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**+
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** GNU Lesser General Public License Usage+
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** Alternatively, this file may be used under the terms of the GNU Lesser+
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** General Public License version 2.1 as published by the Free Software+
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** Foundation and appearing in the file LICENSE.LGPL included in the+
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** packaging of this file.  Please review the following information to+
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** ensure the GNU Lesser General Public License version 2.1 requirements+
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.+
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**+
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** In addition, as a special exception, Nokia gives you certain additional+
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** rights.  These rights are described in the Nokia Qt LGPL Exception+
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.+
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**+
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** If you have questions regarding the use of this file, please contact+
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** Nokia at qt-info@nokia.com.+
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**+
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**+
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**+
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**+
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**+
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**+
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**+
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**+
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** $QT_END_LICENSE$+
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**+
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****************************************************************************/+
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+
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#include <qdebug.h>+
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#include "qglpixelbuffer.h"+
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#include "qglpixelbuffer_p.h"+
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#include "qgl_egl_p.h"+
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+
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#include <qimage.h>+
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#include <private/qgl_p.h>+
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+
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#ifdef QT_OPENGL_ES_1_CL+
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#include "qgl_cl_p.h"+
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#endif+
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+
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QT_BEGIN_NAMESPACE+
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+
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#ifdef EGL_BIND_TO_TEXTURE_RGBA+
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#define QGL_RENDER_TEXTURE 1+
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#else+
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#define QGL_RENDER_TEXTURE 0+
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#endif+
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+
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bool QGLPixelBufferPrivate::init(const QSize &size, const QGLFormat &f, QGLWidget *shareWidget)+
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{+
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    // Create the EGL context.+
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    ctx = new QEglContext();+
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    ctx->setApi(QEgl::OpenGL);+
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+
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    // Find the shared context.+
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    QEglContext *shareContext = 0;+
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    if (shareWidget && shareWidget->d_func()->glcx)+
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        shareContext = shareWidget->d_func()->glcx->d_func()->eglContext;+
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+
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    // Choose an appropriate configuration.  We use the best format+
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    // we can find, even if it is greater than the requested format.+
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    // We try for a pbuffer that is capable of texture rendering if possible.+
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    textureFormat = EGL_NONE;+
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    if (shareContext) {+
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        // Use the same configuration as the widget we are sharing with.+
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        ctx->setConfig(shareContext->config());+
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#if QGL_RENDER_TEXTURE+
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        EGLint value = EGL_FALSE;+
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        if (ctx->configAttrib(EGL_BIND_TO_TEXTURE_RGBA, &value) && value)+
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            textureFormat = EGL_TEXTURE_RGBA;+
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        else if (ctx->configAttrib(EGL_BIND_TO_TEXTURE_RGB, &value) && value)+
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            textureFormat = EGL_TEXTURE_RGB;+
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#endif+
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    } else {+
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        QEglProperties configProps;+
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        qt_egl_set_format(configProps, QInternal::Pbuffer, f);+
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        configProps.setRenderableType(ctx->api());+
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        bool ok = false;+
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#if QGL_RENDER_TEXTURE+
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        textureFormat = EGL_TEXTURE_RGBA;+
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        configProps.setValue(EGL_BIND_TO_TEXTURE_RGBA, EGL_TRUE);+
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        ok = ctx->chooseConfig(configProps, QEgl::BestPixelFormat);+
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        if (!ok) {+
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            // Try again with RGB texture rendering.+
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            textureFormat = EGL_TEXTURE_RGB;+
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            configProps.removeValue(EGL_BIND_TO_TEXTURE_RGBA);+
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            configProps.setValue(EGL_BIND_TO_TEXTURE_RGB, EGL_TRUE);+
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            ok = ctx->chooseConfig(configProps, QEgl::BestPixelFormat);+
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            if (!ok) {+
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                // One last try for a pbuffer with no texture rendering.+
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                configProps.removeValue(EGL_BIND_TO_TEXTURE_RGB);+
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                textureFormat = EGL_NONE;+
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            }+
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        }+
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#endif+
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        if (!ok) {+
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            if (!ctx->chooseConfig(configProps, QEgl::BestPixelFormat)) {+
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                delete ctx;+
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                ctx = 0;+
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                return false;+
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            }+
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        }+
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    }+
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+
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    // Retrieve the actual format properties.+
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    qt_egl_update_format(*ctx, format);+
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+
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    // Create the attributes needed for the pbuffer.+
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    QEglProperties attribs;+
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    attribs.setValue(EGL_WIDTH, size.width());+
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    attribs.setValue(EGL_HEIGHT, size.height());+
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#if QGL_RENDER_TEXTURE+
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    if (textureFormat != EGL_NONE) {+
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        attribs.setValue(EGL_TEXTURE_FORMAT, textureFormat);+
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        attribs.setValue(EGL_TEXTURE_TARGET, EGL_TEXTURE_2D);+
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    }+
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#endif+
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+
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    // Create the pbuffer surface.+
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    pbuf = eglCreatePbufferSurface(ctx->display(), ctx->config(), attribs.properties());+
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#if QGL_RENDER_TEXTURE+
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    if (pbuf == EGL_NO_SURFACE && textureFormat != EGL_NONE) {+
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        // Try again with texture rendering disabled.+
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        textureFormat = EGL_NONE;+
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        attribs.removeValue(EGL_TEXTURE_FORMAT);+
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        attribs.removeValue(EGL_TEXTURE_TARGET);+
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        pbuf = eglCreatePbufferSurface(ctx->display(), ctx->config(), attribs.properties());+
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    }+
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#endif+
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    if (pbuf == EGL_NO_SURFACE) {+
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        qWarning() << "QGLPixelBufferPrivate::init(): Unable to create EGL pbuffer surface:" << QEglContext::errorString(eglGetError());+
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        return false;+
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    }+
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+
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    // Create a new context for the configuration.+
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    if (!ctx->createContext(shareContext)) {+
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        delete ctx;+
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        ctx = 0;+
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        return false;+
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    }+
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+
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    return true;+
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}+
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+
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bool QGLPixelBufferPrivate::cleanup()+
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{+
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    // No need to destroy "pbuf" here - it is done in QGLContext::reset().+
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    return true;+
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}+
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+
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bool QGLPixelBuffer::bindToDynamicTexture(GLuint texture_id)+
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{+
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#if QGL_RENDER_TEXTURE+
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    Q_D(QGLPixelBuffer);+
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    if (d->invalid || d->textureFormat == EGL_NONE || !d->ctx)+
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        return false;+
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    glBindTexture(GL_TEXTURE_2D, texture_id);+
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    return eglBindTexImage(d->ctx->display(), d->pbuf, EGL_BACK_BUFFER);+
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#else+
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    Q_UNUSED(texture_id);+
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    return false;+
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#endif+
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}+
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+
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void QGLPixelBuffer::releaseFromDynamicTexture()+
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{+
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#if QGL_RENDER_TEXTURE+
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    Q_D(QGLPixelBuffer);+
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    if (d->invalid || d->textureFormat == EGL_NONE || !d->ctx)+
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        return;+
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    eglReleaseTexImage(d->ctx->display(), d->pbuf, EGL_BACK_BUFFER);+
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#endif+
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}+
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+
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+
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GLuint QGLPixelBuffer::generateDynamicTexture() const+
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{+
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#if QGL_RENDER_TEXTURE+
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    Q_D(const QGLPixelBuffer);+
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    GLuint texture;+
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    glGenTextures(1, &texture);+
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    glBindTexture(GL_TEXTURE_2D, texture);+
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    if (d->textureFormat == EGL_TEXTURE_RGB)+
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        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, d->req_size.width(), d->req_size.height(), 0, GL_RGB, GL_UNSIGNED_BYTE, 0);+
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    else+
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        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, d->req_size.width(), d->req_size.height(), 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);+
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    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);+
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    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);+
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    return texture;+
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#else+
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    return 0;+
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#endif+
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}+
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+
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bool QGLPixelBuffer::hasOpenGLPbuffers()+
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{+
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    // See if we have at least 1 configuration that matches the default format.+
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    EGLDisplay dpy = QEglContext::display();+
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    if (dpy == EGL_NO_DISPLAY)+
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        return false;+
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    QEglProperties configProps;+
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    qt_egl_set_format(configProps, QInternal::Pbuffer, QGLFormat::defaultFormat());+
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    configProps.setRenderableType(QEgl::OpenGL);+
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    do {+
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        EGLConfig cfg = 0;+
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        EGLint matching = 0;+
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        if (eglChooseConfig(dpy, configProps.properties(),+
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                            &cfg, 1, &matching) && matching > 0)+
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            return true;+
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    } while (configProps.reduceConfiguration());+
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    return false;+
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}+
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+
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QT_END_NAMESPACE+
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