Lighthouse: Adding EGL support to the xcb plugin

2 files changed, 239 insertions, 0 deletions

diff --git a/src/plugins/platforms/eglconvenience/qxlibeglintegration.cpp b/src/plugins/platforms/eglconvenience/qxlibeglintegration.cpp
new file mode 100644
index 0000000..1135d2f
--- /dev/null
+++ b/src/plugins/platforms/eglconvenience/qxlibeglintegration.cpp
@@ -0,0 +1,186 @@
+/****************************************************************************
+**
+** 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 QtOpenVG 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 "qxlibeglintegration.h"
+
+static int countBits(unsigned long mask)
+{
+    int count = 0;
+    while (mask != 0) {
+        if (mask & 1)
+            ++count;
+        mask >>= 1;
+    }
+    return count;
+}
+
+VisualID QXlibEglIntegration::getCompatibleVisualId(Display *display, EGLConfig config)
+{
+    VisualID    visualId = 0;
+    EGLint      eglValue = 0;
+
+    EGLDisplay eglDisplay = eglGetDisplay(display);
+
+    EGLint configRedSize = 0;
+    eglGetConfigAttrib(eglDisplay, config, EGL_RED_SIZE, &configRedSize);
+
+    EGLint configGreenSize = 0;
+    eglGetConfigAttrib(eglDisplay, config, EGL_GREEN_SIZE, &configGreenSize);
+
+    EGLint configBlueSize = 0;
+    eglGetConfigAttrib(eglDisplay, config, EGL_BLUE_SIZE, &configBlueSize);
+
+    EGLint configAlphaSize = 0;
+    eglGetConfigAttrib(eglDisplay, config, EGL_ALPHA_SIZE, &configAlphaSize);
+
+    eglGetConfigAttrib(eglDisplay, config, EGL_CONFIG_ID, &eglValue);
+    int configId = eglValue;
+
+    // See if EGL provided a valid VisualID:
+    eglGetConfigAttrib(eglDisplay, config, EGL_NATIVE_VISUAL_ID, &eglValue);
+    visualId = (VisualID)eglValue;
+    if (visualId) {
+        // EGL has suggested a visual id, so get the rest of the visual info for that id:
+        XVisualInfo visualInfoTemplate;
+        memset(&visualInfoTemplate, 0, sizeof(XVisualInfo));
+        visualInfoTemplate.visualid = visualId;
+
+        XVisualInfo *chosenVisualInfo;
+        int matchingCount = 0;
+        chosenVisualInfo = XGetVisualInfo(display, VisualIDMask, &visualInfoTemplate, &matchingCount);
+        if (chosenVisualInfo) {
+            // Skip size checks if implementation supports non-matching visual
+            // and config (http://bugreports.qt.nokia.com/browse/QTBUG-9444).
+            if (q_hasEglExtension(eglDisplay,"EGL_NV_post_convert_rounding")) {
+                XFree(chosenVisualInfo);
+                return visualId;
+            }
+
+            int visualRedSize = countBits(chosenVisualInfo->red_mask);
+            int visualGreenSize = countBits(chosenVisualInfo->green_mask);
+            int visualBlueSize = countBits(chosenVisualInfo->blue_mask);
+            int visualAlphaSize = -1; // Need XRender to tell us the alpha channel size
+
+            bool visualMatchesConfig = false;
+            if ( visualRedSize == configRedSize &&
+                 visualGreenSize == configGreenSize &&
+                 visualBlueSize == configBlueSize )
+            {
+                // We need XRender to check the alpha channel size of the visual. If we don't have
+                // the alpha size, we don't check it against the EGL config's alpha size.
+                if (visualAlphaSize >= 0)
+                    visualMatchesConfig = visualAlphaSize == configAlphaSize;
+                else
+                    visualMatchesConfig = true;
+            }
+
+            if (!visualMatchesConfig) {
+                if (visualAlphaSize >= 0) {
+                    qWarning("Warning: EGL suggested using X Visual ID %d (ARGB%d%d%d%d) for EGL config %d (ARGB%d%d%d%d), but this is incompatable",
+                             (int)visualId, visualAlphaSize, visualRedSize, visualGreenSize, visualBlueSize,
+                             configId, configAlphaSize, configRedSize, configGreenSize, configBlueSize);
+                } else {
+                    qWarning("Warning: EGL suggested using X Visual ID %d (RGB%d%d%d) for EGL config %d (RGB%d%d%d), but this is incompatable",
+                             (int)visualId, visualRedSize, visualGreenSize, visualBlueSize,
+                             configId, configRedSize, configGreenSize, configBlueSize);
+                }
+                visualId = 0;
+            }
+        } else {
+            qWarning("Warning: EGL suggested using X Visual ID %d for EGL config %d, but that isn't a valid ID",
+                     (int)visualId, configId);
+            visualId = 0;
+        }
+        XFree(chosenVisualInfo);
+    }
+#ifdef QT_DEBUG_X11_VISUAL_SELECTION
+    else
+        qDebug("EGL did not suggest a VisualID (EGL_NATIVE_VISUAL_ID was zero) for EGLConfig %d", configId);
+#endif
+
+    if (visualId) {
+#ifdef QT_DEBUG_X11_VISUAL_SELECTION
+        if (configAlphaSize > 0)
+            qDebug("Using ARGB Visual ID %d provided by EGL for config %d", (int)visualId, configId);
+        else
+            qDebug("Using Opaque Visual ID %d provided by EGL for config %d", (int)visualId, configId);
+#endif
+        return visualId;
+    }
+
+    // Finally, try to
+    // use XGetVisualInfo and only use the bit depths to match on:
+    if (!visualId) {
+        XVisualInfo visualInfoTemplate;
+        memset(&visualInfoTemplate, 0, sizeof(XVisualInfo));
+        XVisualInfo *matchingVisuals;
+        int matchingCount = 0;
+
+        visualInfoTemplate.depth = configRedSize + configGreenSize + configBlueSize + configAlphaSize;
+        matchingVisuals = XGetVisualInfo(display,
+                                         VisualDepthMask,
+                                         &visualInfoTemplate,
+                                         &matchingCount);
+        if (!matchingVisuals) {
+            // Try again without taking the alpha channel into account:
+            visualInfoTemplate.depth = configRedSize + configGreenSize + configBlueSize;
+            matchingVisuals = XGetVisualInfo(display,
+                                             VisualDepthMask,
+                                             &visualInfoTemplate,
+                                             &matchingCount);
+        }
+
+        if (matchingVisuals) {
+            visualId = matchingVisuals[0].visualid;
+            XFree(matchingVisuals);
+        }
+    }
+
+    if (visualId) {
+#ifdef QT_DEBUG_X11_VISUAL_SELECTION
+        qDebug("Using Visual ID %d provided by XGetVisualInfo for EGL config %d", (int)visualId, configId);
+#endif
+        return visualId;
+    }
+
+    qWarning("Unable to find an X11 visual which matches EGL config %d", configId);
+    return (VisualID)0;
+}
diff --git a/src/plugins/platforms/eglconvenience/qxlibeglintegration.h b/src/plugins/platforms/eglconvenience/qxlibeglintegration.h
new file mode 100644
index 0000000..f62dce4
--- /dev/null
+++ b/src/plugins/platforms/eglconvenience/qxlibeglintegration.h
@@ -0,0 +1,53 @@
+/****************************************************************************
+**
+** 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 QtOpenVG 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 QTESTLITEEGLINTEGRATION_H
+#define QTESTLITEEGLINTEGRATION_H
+
+#include "qeglconvenience.h"
+
+class QXlibEglIntegration
+{
+public:
+    static VisualID getCompatibleVisualId(Display *display, EGLConfig config);
+};
+
+#endif // QTESTLITEEGLINTEGRATION_H