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Branched from the monolithic repo, Qt master branch, at commit
896db169ea224deb96c59ce8af800d019de63f12

1 files changed, 224 insertions, 0 deletions

diff --git a/src/opengl/qglpixelbuffer_egl.cpp b/src/opengl/qglpixelbuffer_egl.cpp
new file mode 100644
index 0000000000..c0e6f4eae6
--- /dev/null
+++ b/src/opengl/qglpixelbuffer_egl.cpp
@@ -0,0 +1,224 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtOpenGL module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** 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, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <qdebug.h>
+#include "qglpixelbuffer.h"
+#include "qglpixelbuffer_p.h"
+#include "qgl_egl_p.h"
+
+#include <qimage.h>
+#include <private/qgl_p.h>
+
+QT_BEGIN_NAMESPACE
+
+#ifdef EGL_BIND_TO_TEXTURE_RGBA
+#define QGL_RENDER_TEXTURE 1
+#else
+#define QGL_RENDER_TEXTURE 0
+#endif
+
+bool QGLPixelBufferPrivate::init(const QSize &size, const QGLFormat &f, QGLWidget *shareWidget)
+{
+    // Create the EGL context.
+    ctx = new QEglContext();
+    ctx->setApi(QEgl::OpenGL);
+
+    // Find the shared context.
+    QEglContext *shareContext = 0;
+    if (shareWidget && shareWidget->d_func()->glcx)
+        shareContext = shareWidget->d_func()->glcx->d_func()->eglContext;
+
+    // Choose an appropriate configuration.  We use the best format
+    // we can find, even if it is greater than the requested format.
+    // We try for a pbuffer that is capable of texture rendering if possible.
+    textureFormat = EGL_NONE;
+    if (shareContext) {
+        // Use the same configuration as the widget we are sharing with.
+        ctx->setConfig(shareContext->config());
+#if QGL_RENDER_TEXTURE
+        if (ctx->configAttrib(EGL_BIND_TO_TEXTURE_RGBA) == EGL_TRUE)
+            textureFormat = EGL_TEXTURE_RGBA;
+        else if (ctx->configAttrib(EGL_BIND_TO_TEXTURE_RGB) == EGL_TRUE)
+            textureFormat = EGL_TEXTURE_RGB;
+#endif
+    } else {
+        QEglProperties configProps;
+        qt_eglproperties_set_glformat(configProps, f);
+        configProps.setDeviceType(QInternal::Pbuffer);
+        configProps.setRenderableType(ctx->api());
+        bool ok = false;
+#if QGL_RENDER_TEXTURE
+        textureFormat = EGL_TEXTURE_RGBA;
+        configProps.setValue(EGL_BIND_TO_TEXTURE_RGBA, EGL_TRUE);
+        ok = ctx->chooseConfig(configProps, QEgl::BestPixelFormat);
+        if (!ok) {
+            // Try again with RGB texture rendering.
+            textureFormat = EGL_TEXTURE_RGB;
+            configProps.removeValue(EGL_BIND_TO_TEXTURE_RGBA);
+            configProps.setValue(EGL_BIND_TO_TEXTURE_RGB, EGL_TRUE);
+            ok = ctx->chooseConfig(configProps, QEgl::BestPixelFormat);
+            if (!ok) {
+                // One last try for a pbuffer with no texture rendering.
+                configProps.removeValue(EGL_BIND_TO_TEXTURE_RGB);
+                textureFormat = EGL_NONE;
+            }
+        }
+#endif
+        if (!ok) {
+            if (!ctx->chooseConfig(configProps, QEgl::BestPixelFormat)) {
+                delete ctx;
+                ctx = 0;
+                return false;
+            }
+        }
+    }
+
+    // Retrieve the actual format properties.
+    qt_glformat_from_eglconfig(format, ctx->config());
+
+    // Create the attributes needed for the pbuffer.
+    QEglProperties attribs;
+    attribs.setValue(EGL_WIDTH, size.width());
+    attribs.setValue(EGL_HEIGHT, size.height());
+#if QGL_RENDER_TEXTURE
+    if (textureFormat != EGL_NONE) {
+        attribs.setValue(EGL_TEXTURE_FORMAT, textureFormat);
+        attribs.setValue(EGL_TEXTURE_TARGET, EGL_TEXTURE_2D);
+    }
+#endif
+
+    // Create the pbuffer surface.
+    pbuf = eglCreatePbufferSurface(ctx->display(), ctx->config(), attribs.properties());
+#if QGL_RENDER_TEXTURE
+    if (pbuf == EGL_NO_SURFACE && textureFormat != EGL_NONE) {
+        // Try again with texture rendering disabled.
+        textureFormat = EGL_NONE;
+        attribs.removeValue(EGL_TEXTURE_FORMAT);
+        attribs.removeValue(EGL_TEXTURE_TARGET);
+        pbuf = eglCreatePbufferSurface(ctx->display(), ctx->config(), attribs.properties());
+    }
+#endif
+    if (pbuf == EGL_NO_SURFACE) {
+        qWarning() << "QGLPixelBufferPrivate::init(): Unable to create EGL pbuffer surface:" << QEgl::errorString();
+        return false;
+    }
+
+    // Create a new context for the configuration.
+    if (!ctx->createContext(shareContext)) {
+        delete ctx;
+        ctx = 0;
+        return false;
+    }
+
+    return true;
+}
+
+bool QGLPixelBufferPrivate::cleanup()
+{
+    // No need to destroy "pbuf" here - it is done in QGLContext::reset().
+    return true;
+}
+
+bool QGLPixelBuffer::bindToDynamicTexture(GLuint texture_id)
+{
+#if QGL_RENDER_TEXTURE
+    Q_D(QGLPixelBuffer);
+    if (d->invalid || d->textureFormat == EGL_NONE || !d->ctx)
+        return false;
+    glBindTexture(GL_TEXTURE_2D, texture_id);
+    return eglBindTexImage(d->ctx->display(), d->pbuf, EGL_BACK_BUFFER);
+#else
+    Q_UNUSED(texture_id);
+    return false;
+#endif
+}
+
+void QGLPixelBuffer::releaseFromDynamicTexture()
+{
+#if QGL_RENDER_TEXTURE
+    Q_D(QGLPixelBuffer);
+    if (d->invalid || d->textureFormat == EGL_NONE || !d->ctx)
+        return;
+    eglReleaseTexImage(d->ctx->display(), d->pbuf, EGL_BACK_BUFFER);
+#endif
+}
+
+
+GLuint QGLPixelBuffer::generateDynamicTexture() const
+{
+#if QGL_RENDER_TEXTURE
+    Q_D(const QGLPixelBuffer);
+    GLuint texture;
+    glGenTextures(1, &texture);
+    glBindTexture(GL_TEXTURE_2D, texture);
+    if (d->textureFormat == EGL_TEXTURE_RGB)
+        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, d->req_size.width(), d->req_size.height(), 0, GL_RGB, GL_UNSIGNED_BYTE, 0);
+    else
+        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, d->req_size.width(), d->req_size.height(), 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
+    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+    return texture;
+#else
+    return 0;
+#endif
+}
+
+bool QGLPixelBuffer::hasOpenGLPbuffers()
+{
+    // See if we have at least 1 configuration that matches the default format.
+    EGLDisplay dpy = QEgl::display();
+    if (dpy == EGL_NO_DISPLAY)
+        return false;
+    QEglProperties configProps;
+    qt_eglproperties_set_glformat(configProps, QGLFormat::defaultFormat());
+    configProps.setDeviceType(QInternal::Pbuffer);
+    configProps.setRenderableType(QEgl::OpenGL);
+    do {
+        EGLConfig cfg = 0;
+        EGLint matching = 0;
+        if (eglChooseConfig(dpy, configProps.properties(),
+                            &cfg, 1, &matching) && matching > 0)
+            return true;
+    } while (configProps.reduceConfiguration());
+    return false;
+}
+
+QT_END_NAMESPACE