Add X11 support for the DRIVE CX

The spec, added in 5.7.0, simply defined WIN_INTERFACE_CUSTOM, leading
to the generic, non-X11 typedefs for the EGL native types. This is
fine for the typical embedded use, but is not what is wanted when
targeting xcb, and leads to disabling EGL-on-X support.

Therefore, move the define into a comon header and let the individual
libs decide by defining or not defining QT_EGL_NO_X11. This sets both
MESA_EGL_NO_X11_HEADERS and WIN_INTERFACE_CUSTOM in qt_egl_p.h.

This way Qt builds supporting all three of eglfs (DRM+EGLDevice),
wayland, and xcb (EGL) can be generated out of the box.

[ChangeLog][Platform Specific Changes][Linux] xcb with EGL and OpenGL
ES, as well as eglfs with the eglfs_x11 backend, are now supported on
DRIVE CX boards when using the linux-drive-cx-g++ device spec.

Done-with: Louai Al-Khanji <louai.al-khanji@qt.io>
Task-number: QTBUG-55140
Change-Id: I6f186d16612e170995e3bca1214bcabad59af08e
Reviewed-by: Andy Nichols <andy.nichols@qt.io>

6 files changed, 124 insertions, 8 deletions

diff --git a/src/platformsupport/eglconvenience/eglconvenience.pri b/src/platformsupport/eglconvenience/eglconvenience.pri
index fe6d0eb748..1cacaf4a4c 100644
--- a/src/platformsupport/eglconvenience/eglconvenience.pri
+++ b/src/platformsupport/eglconvenience/eglconvenience.pri
@@ -1,7 +1,8 @@
 contains(QT_CONFIG,egl) {
     HEADERS += \
         $$PWD/qeglconvenience_p.h \
-        $$PWD/qeglstreamconvenience_p.h
+        $$PWD/qeglstreamconvenience_p.h \
+        $$PWD/qt_egl_p.h
 
     SOURCES += \
         $$PWD/qeglconvenience.cpp \
@@ -15,8 +16,8 @@ contains(QT_CONFIG,egl) {
                    $$PWD/qeglpbuffer.cpp
     }
 
-    # Avoid X11 header collision
-    DEFINES += MESA_EGL_NO_X11_HEADERS
+    # Avoid X11 header collision, use generic EGL native types
+    DEFINES += QT_EGL_NO_X11
 
     contains(QT_CONFIG,xlib) {
         HEADERS += \
diff --git a/src/platformsupport/eglconvenience/qeglconvenience_p.h b/src/platformsupport/eglconvenience/qeglconvenience_p.h
index ec5c1e403a..fdd21b8f19 100644
--- a/src/platformsupport/eglconvenience/qeglconvenience_p.h
+++ b/src/platformsupport/eglconvenience/qeglconvenience_p.h
@@ -54,7 +54,7 @@
 #include <QtGui/QSurfaceFormat>
 #include <QtCore/QVector>
 #include <QtCore/QSizeF>
-#include <EGL/egl.h>
+#include <QtPlatformSupport/private/qt_egl_p.h>
 
 QT_BEGIN_NAMESPACE
 
diff --git a/src/platformsupport/eglconvenience/qeglpbuffer_p.h b/src/platformsupport/eglconvenience/qeglpbuffer_p.h
index 19a29d5dd8..4f9ea9d5f3 100644
--- a/src/platformsupport/eglconvenience/qeglpbuffer_p.h
+++ b/src/platformsupport/eglconvenience/qeglpbuffer_p.h
@@ -53,7 +53,6 @@
 
 #include <qpa/qplatformoffscreensurface.h>
 #include <QtPlatformSupport/private/qeglplatformcontext_p.h>
-#include <EGL/egl.h>
 
 QT_BEGIN_NAMESPACE
 
diff --git a/src/platformsupport/eglconvenience/qeglplatformcontext_p.h b/src/platformsupport/eglconvenience/qeglplatformcontext_p.h
index e772f5df89..f6b2b876f7 100644
--- a/src/platformsupport/eglconvenience/qeglplatformcontext_p.h
+++ b/src/platformsupport/eglconvenience/qeglplatformcontext_p.h
@@ -55,7 +55,7 @@
 #include <qpa/qplatformwindow.h>
 #include <qpa/qplatformopenglcontext.h>
 #include <QtCore/QVariant>
-#include <EGL/egl.h>
+#include <QtPlatformSupport/private/qt_egl_p.h>
 
 QT_BEGIN_NAMESPACE
 
diff --git a/src/platformsupport/eglconvenience/qeglstreamconvenience_p.h b/src/platformsupport/eglconvenience/qeglstreamconvenience_p.h
index c8a8096816..f535afbc55 100644
--- a/src/platformsupport/eglconvenience/qeglstreamconvenience_p.h
+++ b/src/platformsupport/eglconvenience/qeglstreamconvenience_p.h
@@ -52,8 +52,7 @@
 //
 
 #include <qglobal.h>
-#include <EGL/egl.h>
-#include <EGL/eglext.h>
+#include <QtPlatformSupport/private/qt_egl_p.h>
 
 // This provides runtime EGLDevice/Output/Stream support even when eglext.h in
 // the sysroot is not up-to-date.
diff --git a/src/platformsupport/eglconvenience/qt_egl_p.h b/src/platformsupport/eglconvenience/qt_egl_p.h
new file mode 100644
index 0000000000..615ee4b80a
--- /dev/null
+++ b/src/platformsupport/eglconvenience/qt_egl_p.h
@@ -0,0 +1,117 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QT_EGL_P_H
+#define QT_EGL_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.
+//
+
+#ifdef QT_EGL_NO_X11
+# define MESA_EGL_NO_X11_HEADERS // MESA
+# define WIN_INTERFACE_CUSTOM    // NV
+#endif // QT_EGL_NO_X11
+
+#ifdef QT_EGL_WAYLAND
+# define WAYLAND // NV
+#endif // QT_EGL_WAYLAND
+
+#include <EGL/egl.h>
+#include <EGL/eglext.h>
+
+#include <stdint.h>
+
+QT_BEGIN_NAMESPACE
+
+namespace QtInternal {
+
+template <class FromType, class ToType>
+struct QtEglConverter
+{
+    static inline ToType convert(FromType v)
+    { return v; }
+};
+
+template <>
+struct QtEglConverter<uint32_t, uintptr_t>
+{
+    static inline uintptr_t convert(uint32_t v)
+    { return v; }
+};
+
+#if Q_PROCESSOR_WORDSIZE > 4
+template <>
+struct QtEglConverter<uintptr_t, uint32_t>
+{
+    static inline uint32_t convert(uintptr_t v)
+    { return uint32_t(v); }
+};
+#endif
+
+template <>
+struct QtEglConverter<uint32_t, void *>
+{
+    static inline void *convert(uint32_t v)
+    { return reinterpret_cast<void *>(uintptr_t(v)); }
+};
+
+template <>
+struct QtEglConverter<void *, uint32_t>
+{
+    static inline uint32_t convert(void *v)
+    { return uintptr_t(v); }
+};
+
+} // QtInternal
+
+template <class ToType, class FromType>
+static inline ToType qt_egl_cast(FromType from)
+{ return QtInternal::QtEglConverter<FromType, ToType>::convert(from); }
+
+QT_END_NAMESPACE
+
+#endif // QT_EGL_P_H