qt: add support for building on osx/ios

Including:
- Necessary configure checks
- Necessary compile time platform checks
- Necessary runtime qt iOS/OSX platform detection

https://bugzilla.gnome.org/show_bug.cgi?id=755100

configure.ac

@@ -2753,7 +2753,7 @@ AM_CONDITIONAL(USE_GTK3_GL, test "x$HAVE_GTK3_GL" = "xyes")
 dnl *** Qt ***
 translit(dnm, m, l) AM_CONDITIONAL(USE_QT, true)
 AG_GST_CHECK_FEATURE(QT, [Qt elements], qt, [
-  PKG_CHECK_MODULES(QT, Qt5Core Qt5Gui Qt5Quick >= 5.4.0, [
+  PKG_CHECK_MODULES(QT, Qt5Core Qt5Gui Qt5Qml Qt5Quick >= 5.4.0, [
       QT_PATH=`$PKG_CONFIG --variable=exec_prefix Qt5Core`
       QT_HOST_PATH=`$PKG_CONFIG --variable=host_bins Qt5Core`
       AC_PATH_PROGS(MOC, [moc-qt5 moc], moc, ["${QT_HOST_PATH}" "${QT_PATH}/bin"])
@@ -2801,6 +2801,25 @@ AG_GST_CHECK_FEATURE(QT, [Qt elements], qt, [
             HAVE_QT_WINDOWING="yes"
           ], [AC_MSG_NOTICE([Could not find Qt Android integration])])
         fi
+        if test "x$GST_GL_HAVE_WINDOW_COCOA" = "x1" -a "x$GST_GL_HAVE_PLATFORM_CGL" = "x1"; then
+          PKG_CHECK_MODULES(QT_MAC, Qt5MacExtras, [
+            AC_DEFINE([HAVE_QT_MAC], [],
+                [Define if Qt Mac integration is installed])
+            QT_LIBDIR=`$PKG_CONFIG --variable=libdir Qt5Core`
+            QT_CFLAGS="$QT_CFLAGS $QT_MAC_CFLAGS -F$QT_LIBDIR -framework QtCore -framework QtGui -framework QtQuick -framework QtQml -framework QtMacExtras"
+            QT_LIBS="$QT_LIBS $QT_MAC_LIBS"
+            HAVE_QT_WINDOWING="yes"
+          ], [AC_MSG_NOTICE([Could not find Qt Mac integration])])
+        fi
+        if test "x$GST_GL_HAVE_WINDOW_EAGL" = "x1" -a "x$GST_GL_HAVE_PLATFORM_EAGL" = "x1"; then
+          if test "x$HAVE_IOS" = "xyes"; then
+            # iOS doesn't have its own extras package so if we have the core
+            # modules we are good to go
+            AC_DEFINE([HAVE_QT_IOS], [],
+                [Define if Qt iOS integration is installed])
+            HAVE_QT_WINDOWING="yes"
+          fi
+        fi
         if test "x$HAVE_QT_WINDOWING" = "xno"; then
           AC_MSG_WARN([Could not find any Qt Windowing integration])
           HAVE_QT="no"

ext/qt/gstplugin.cc

@@ -23,7 +23,7 @@
 #endif
 
 #include "gstqtsink.h"
-#include <QQmlApplicationEngine>
+#include <QtQml/QQmlApplicationEngine>
 
 static gboolean
 plugin_init (GstPlugin * plugin)

ext/qt/gstqsgtexture.h

@@ -26,8 +26,8 @@
 #include <gst/gl/gl.h>
 
 #include "gstqtgl.h"
-#include <QSGTexture>
-#include <QOpenGLFunctions>
+#include <QtQuick/QSGTexture>
+#include <QtGui/QOpenGLFunctions>
 
 class GstQSGTexture : public QSGTexture, protected QOpenGLFunctions
 {

ext/qt/gstqtsink.cc

@@ -28,7 +28,7 @@
 #endif
 
 #include "gstqtsink.h"
-#include <QGuiApplication>
+#include <QtGui/QGuiApplication>
 
 #define GST_CAT_DEFAULT gst_debug_qt_gl_sink
 GST_DEBUG_CATEGORY (GST_CAT_DEFAULT);

ext/qt/qtitem.cc

@@ -28,9 +28,9 @@
 #include "qtitem.h"
 #include "gstqsgtexture.h"
 
-#include <QGuiApplication>
-#include <QQuickWindow>
-#include <QSGSimpleTextureNode>
+#include <QtGui/QGuiApplication>
+#include <QtQuick/QQuickWindow>
+#include <QtQuick/QSGSimpleTextureNode>
 
 #if GST_GL_HAVE_WINDOW_X11 && GST_GL_HAVE_PLATFORM_GLX && defined (HAVE_QT_X11)
 #include <QX11Info>
@@ -47,6 +47,10 @@
 #include <gst/gl/egl/gstglcontext_egl.h>
 #endif
 
+#if GST_GL_HAVE_WINDOW_COCOA && GST_GL_HAVE_PLATFORM_COCOA && defined (HAVE_QT_MAC)
+#include <gst/gl/coaoa/gstgldisplay_cocoa.h>
+#endif
+
 /**
  * SECTION:gtkgstglwidget
  * @short_description: a #GtkGLArea that renders GStreamer video #GstBuffers
@@ -126,6 +130,14 @@ QtGLVideoItem::QtGLVideoItem()
   if (QString::fromUtf8 ("android") == app->platformName())
     this->priv->display = (GstGLDisplay *) gst_gl_display_egl_new ();
 #endif
+#if GST_GL_HAVE_WINDOW_COCOA && GST_GL_HAVE_PLATFORM_COCOA && defined (HAVE_QT_MAC)
+  if (QString::fromUtf8 ("cocoa") == app->platformName())
+    this->priv->display = (GstGLDisplay *) gst_gl_display_cocoa_new ();
+#endif
+#if GST_GL_HAVE_WINDOW_EAGL && GST_GL_HAVE_PLATFORM_EAGL && defined (HAVE_QT_IOS)
+  if (QString::fromUtf8 ("ios") == app->platformName())
+    this->priv->display = gst_gl_display_new ();
+#endif
 
   if (!this->priv->display)
     this->priv->display = gst_gl_display_new ();
@@ -303,6 +315,28 @@ QtGLVideoItem::onSceneGraphInitialized ()
           platform, gl_api);
   }
 #endif
+#if GST_GL_HAVE_WINDOW_COCOA && GST_GL_HAVE_PLATFORM_COCOA && defined (HAVE_QT_MAC)
+  if (this->priv->display) {
+    platform = GST_GL_PLATFORM_CGL;
+    gl_api = gst_gl_context_get_current_gl_api (platform, NULL, NULL);
+    gl_handle = gst_gl_context_get_current_gl_context (platform);
+    if (gl_handle)
+      this->priv->other_context =
+          gst_gl_context_new_wrapped (this->priv->display, gl_handle,
+          platform, gl_api);
+  }
+#endif
+#if GST_GL_HAVE_WINDOW_EAGL && GST_GL_HAVE_PLATFORM_EAGL && defined (HAVE_QT_IOS)
+  if (this->priv->display) {
+    platform = GST_GL_PLATFORM_EAGL;
+    gl_api = gst_gl_context_get_current_gl_api (platform, NULL, NULL);
+    gl_handle = gst_gl_context_get_current_gl_context (platform);
+    if (gl_handle)
+      this->priv->other_context =
+          gst_gl_context_new_wrapped (this->priv->display, gl_handle,
+          platform, gl_api);
+  }
+#endif
 
   (void) platform;
   (void) gl_api;

ext/qt/qtitem.h

@@ -25,9 +25,9 @@
 #include <gst/gl/gl.h>
 
 #include "gstqtgl.h"
-#include <QQuickItem>
-#include <QOpenGLContext>
-#include <QOpenGLFunctions>
+#include <QtQuick/QQuickItem>
+#include <QtGui/QOpenGLContext>
+#include <QtGui/QOpenGLFunctions>
 
 typedef struct _QtGLVideoItemPrivate QtGLVideoItemPrivate;