Add a new QX11GLPixmapData which renders to X pixmaps using GL

Enable it by setting QT_USE_X11GL_PIXMAPS environment variable while
using the -graphicssystem opengl

7 files changed, 302 insertions, 5 deletions

diff --git a/src/opengl/opengl.pro b/src/opengl/opengl.pro
index 058016e..961c781 100644
--- a/src/opengl/opengl.pro
+++ b/src/opengl/opengl.pro
@@ -82,9 +82,12 @@ x11 {
     contains(QT_CONFIG, opengles1)|contains(QT_CONFIG, opengles1cl)|contains(QT_CONFIG, opengles2) {
         SOURCES +=  qgl_x11egl.cpp \
                     qglpixelbuffer_egl.cpp \
-                    qgl_egl.cpp
+                    qgl_egl.cpp \
+                    qpixmapdata_x11gl_egl.cpp
+
+        HEADERS +=  qgl_egl_p.h \
+                    qpixmapdata_x11gl_p.h
 
-        HEADERS +=  qgl_egl_p.h
 
     } else {
         SOURCES +=  qgl_x11.cpp \
diff --git a/src/opengl/qgl.h b/src/opengl/qgl.h
index b1c1317..e14e7fb 100644
--- a/src/opengl/qgl.h
+++ b/src/opengl/qgl.h
@@ -411,6 +411,7 @@ private:
     friend class QGLFramebufferObjectPrivate;
     friend class QGLFBOGLPaintDevice;
     friend class QGLPaintDevice;
+    friend class QX11GLPixmapData;
 private:
     Q_DISABLE_COPY(QGLContext)
 };
diff --git a/src/opengl/qgl_x11egl.cpp b/src/opengl/qgl_x11egl.cpp
index 971a660..fb08741 100644
--- a/src/opengl/qgl_x11egl.cpp
+++ b/src/opengl/qgl_x11egl.cpp
@@ -513,8 +513,11 @@ bool Q_OPENGL_EXPORT qt_createEGLSurfaceForPixmap(QPixmapData* pmd, bool readOnl
                                            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 %d", (int)pixmapConfig);
+        qWarning() << "Failed to create a pixmap surface using config" << (int)pixmapConfig
+                   << ":" << QEglContext::errorString(eglGetError());
         return false;
     }
 
diff --git a/src/opengl/qglpaintdevice.cpp b/src/opengl/qglpaintdevice.cpp
index e68a4b9..2867de5 100644
--- a/src/opengl/qglpaintdevice.cpp
+++ b/src/opengl/qglpaintdevice.cpp
@@ -44,6 +44,9 @@
 #include <private/qglpixelbuffer_p.h>
 #include <private/qglframebufferobject_p.h>
 #include <private/qwindowsurface_gl_p.h>
+#ifdef Q_WS_X11
+#include <private/qpixmapdata_x11gl_p.h>
+#endif
 
 #if !defined(QT_OPENGL_ES_1) && !defined(QT_OPENGL_ES_1_CL)
 #include <private/qpixmapdata_gl_p.h>
@@ -81,6 +84,7 @@ void QGLPaintDevice::beginPaint()
     // explicitly unbind.  Otherwise the painting will go into
     // the previous FBO instead of to the window.
     m_previousFBO = ctx->d_func()->current_fbo;
+
     if (m_previousFBO != m_thisFBO) {
         ctx->d_ptr->current_fbo = m_thisFBO;
         glBindFramebuffer(GL_FRAMEBUFFER_EXT, m_thisFBO);
@@ -186,8 +190,14 @@ QGLPaintDevice* QGLPaintDevice::getDevice(QPaintDevice* pd)
         case QInternal::Pixmap: {
 #if !defined(QT_OPENGL_ES_1) && !defined(QT_OPENGL_ES_1_CL)
             QPixmapData* pmd = static_cast<QPixmap*>(pd)->pixmapData();
-            Q_ASSERT(pmd->classId() == QPixmapData::OpenGLClass);
-            glpd = static_cast<QGLPixmapData*>(pmd)->glDevice();
+            if (pmd->classId() == QPixmapData::OpenGLClass)
+                glpd = static_cast<QGLPixmapData*>(pmd)->glDevice();
+#ifdef Q_WS_X11
+            else if (pmd->classId() == QPixmapData::X11Class)
+                glpd = static_cast<QX11GLPixmapData*>(pmd);
+#endif
+            else
+                qWarning("Pixmap type not supported for GL rendering");
 #else
             qWarning("Pixmap render targets not supported on OpenGL ES 1.x");
 #endif
diff --git a/src/opengl/qgraphicssystem_gl.cpp b/src/opengl/qgraphicssystem_gl.cpp
index 3e7fece..60d58a7 100644
--- a/src/opengl/qgraphicssystem_gl.cpp
+++ b/src/opengl/qgraphicssystem_gl.cpp
@@ -47,12 +47,21 @@
 #include "private/qgl_p.h"
 #include <private/qwindowsurface_raster_p.h>
 
+#ifdef Q_WS_X11
+#include "private/qpixmapdata_x11gl_p.h"
+#endif
+
 QT_BEGIN_NAMESPACE
 
 extern QGLWidget *qt_gl_getShareWidget();
 
 QPixmapData *QGLGraphicsSystem::createPixmapData(QPixmapData::PixelType type) const
 {
+#ifdef Q_WS_X11
+    if (type == QPixmapData::PixmapType && QX11GLPixmapData::hasX11GLPixmaps())
+        return new QX11GLPixmapData();
+#endif
+
     return new QGLPixmapData(type);
 }
 
diff --git a/src/opengl/qpixmapdata_x11gl_egl.cpp b/src/opengl/qpixmapdata_x11gl_egl.cpp
new file mode 100644
index 0000000..1590ba5
--- /dev/null
+++ b/src/opengl/qpixmapdata_x11gl_egl.cpp
@@ -0,0 +1,183 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 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 <private/qgl_p.h>
+#include <private/qegl_p.h>
+#include <private/qeglproperties_p.h>
+#include <private/qpaintengineex_opengl2_p.h>
+
+#include "qpixmapdata_x11gl_p.h"
+
+QT_BEGIN_NAMESPACE
+
+extern EGLConfig qt_chooseEGLConfigForPixmap(bool hasAlpha, bool readOnly); // in qgl_x11egl.cpp
+extern bool qt_createEGLSurfaceForPixmap(QPixmapData* pmd, bool readOnly); // in qgl_x11egl.cpp
+
+static EGLContext qPixmapSharedEglContext = EGL_NO_CONTEXT;
+
+void QX11GLPixmapData::createPixmapSharedContext(EGLConfig config)
+{
+    eglBindAPI(EGL_OPENGL_ES_API);
+    EGLint contextAttribs[] = {
+#if defined(QT_OPENGL_ES_2)
+        EGL_CONTEXT_CLIENT_VERSION, 2,
+#endif
+        EGL_NONE
+    };
+    qPixmapSharedEglContext = eglCreateContext(QEglContext::defaultDisplay(0), config, 0, contextAttribs);
+//    qDebug("QX11GLPixmapData::createPixmapSharedContext() Created ctx 0x%x for config %d", qPixmapSharedEglContext, config);
+}
+
+bool QX11GLPixmapData::hasX11GLPixmaps()
+{
+    static bool checkedForX11Pixmaps = false;
+    static bool haveX11Pixmaps = false;
+
+    if (checkedForX11Pixmaps)
+        return haveX11Pixmaps;
+
+    checkedForX11Pixmaps = true;
+
+    do {
+        if (qgetenv("QT_USE_X11GL_PIXMAPS").isEmpty())
+            break;
+
+        // First, check we actually have an EGL config which supports pixmaps
+        EGLConfig config = qt_chooseEGLConfigForPixmap(true, false);
+        if (config == 0)
+            break;
+
+        // Now try to actually create an EGL pixmap surface
+        QX11PixmapData *pd = new QX11PixmapData(QPixmapData::PixmapType);
+        pd->resize(100, 100);
+        bool success = qt_createEGLSurfaceForPixmap(pd, false);
+        if (!success)
+            break;
+
+        createPixmapSharedContext(config);
+
+        haveX11Pixmaps = eglMakeCurrent(QEglContext::defaultDisplay(0),
+                                        (EGLSurface)pd->gl_surface, (EGLSurface)pd->gl_surface,
+                                         qPixmapSharedEglContext);
+
+        eglMakeCurrent(QEglContext::defaultDisplay(0),
+                       EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
+        QGLContextPrivate::destroyGlSurfaceForPixmap(pd);
+        delete pd;
+    } while (0);
+
+    if (haveX11Pixmaps)
+        qDebug("QX11GLPixmapData is supported");
+
+    return haveX11Pixmaps;
+}
+
+QX11GLPixmapData::QX11GLPixmapData()
+    : QX11PixmapData(QPixmapData::PixmapType),
+      ctx(0)
+{
+}
+
+QX11GLPixmapData::~QX11GLPixmapData()
+{
+}
+
+static QGL2PaintEngineEx* qt_gl2_engine_for_pixmaps = 0;
+
+QPaintEngine* QX11GLPixmapData::paintEngine() const
+{
+    // We need to create the context before beginPaint - do it here:
+    if (!ctx) {
+        ctx = new QGLContext(glFormat());
+        if (ctx->d_func()->eglContext == 0)
+            ctx->d_func()->eglContext = new QEglContext();
+        ctx->d_func()->eglContext->openDisplay(0); // ;-)
+        ctx->d_func()->eglContext->setApi(QEgl::OpenGL);
+        ctx->d_func()->eglContext->setContext(qPixmapSharedEglContext);
+    }
+
+    if (!qt_gl2_engine_for_pixmaps)
+        qt_gl2_engine_for_pixmaps = new QGL2PaintEngineEx();
+
+    // Support multiple painters on multiple pixmaps simultaniously
+    if (qt_gl2_engine_for_pixmaps->isActive()) {
+        QPaintEngine* engine = new QGL2PaintEngineEx();
+        engine->setAutoDestruct(true);
+        return engine;
+    }
+
+    return qt_gl2_engine_for_pixmaps;
+}
+
+void QX11GLPixmapData::beginPaint()
+{
+    if ((EGLSurface)gl_surface == EGL_NO_SURFACE) {
+        qt_createEGLSurfaceForPixmap(this, false);
+        ctx->d_func()->eglSurface = (EGLSurface)gl_surface;
+        ctx->d_func()->valid = true; // ;-)
+    }
+
+    QGLPaintDevice::beginPaint();
+}
+
+void QX11GLPixmapData::endPaint()
+{
+    glFinish();
+    QGLPaintDevice::endPaint();
+}
+
+QGLContext* QX11GLPixmapData::context() const
+{
+    return ctx;
+}
+
+QSize QX11GLPixmapData::size() const
+{
+    return QSize(w, h);
+}
+
+
+QGLFormat QX11GLPixmapData::glFormat()
+{
+    return QGLFormat::defaultFormat(); //###
+}
+
+QT_END_NAMESPACE
diff --git a/src/opengl/qpixmapdata_x11gl_p.h b/src/opengl/qpixmapdata_x11gl_p.h
new file mode 100644
index 0000000..3e09ba9
--- /dev/null
+++ b/src/opengl/qpixmapdata_x11gl_p.h
@@ -0,0 +1,88 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 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.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QPIXMAPDATA_X11GL_P_H
+#define QPIXMAPDATA_X11GL_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include <private/qpixmapdata_p.h>
+#include <private/qpixmap_x11_p.h>
+#include <private/qglpaintdevice_p.h>
+
+#include <qgl.h>
+
+QT_BEGIN_NAMESPACE
+
+class QX11GLPixmapData : public QX11PixmapData, public QGLPaintDevice
+{
+public:
+    QX11GLPixmapData();
+    virtual ~QX11GLPixmapData();
+
+    // Re-implemented from QGLPaintDevice
+    QPaintEngine* paintEngine() const; // Also re-implements QX11PixmapData::paintEngine
+    void beginPaint();
+    void endPaint();
+    QGLContext* context() const;
+    QSize size() const;
+
+
+    static bool hasX11GLPixmaps();
+    static QGLFormat glFormat();
+private:
+    static void createPixmapSharedContext(EGLConfig config);
+    mutable QGLContext* ctx;
+};
+
+
+QT_END_NAMESPACE
+
+#endif // QPIXMAPDATA_X11GL_P_H