gl: provide a pkg-config/gir file for the viv-fb backend

Required to be able to generate coherent bindings for window system
specific APIs due to limitations in gobject-introspection.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/4959>

subprojects/gst-plugins-bad/meson.build

@@ -380,6 +380,10 @@ if gstgl_dep.found()
     gstglegl_dep = dependency('gstreamer-gl-egl-1.0', version : gst_req,
         fallback : ['gst-plugins-base', 'gstglegl_dep'], required: true)
   endif
+  if gst_gl_have_window_viv_fb
+    gstglviv_fb_dep = dependency('gstreamer-gl-viv-fb-1.0', version : gst_req,
+        fallback : ['gst-plugins-base', 'gstglviv_fb_dep'], required: true)
+  endif
 endif
 
 libm = cc.find_library('m', required : false)

subprojects/gst-plugins-base/gst-libs/gst/gl/meson.build

@@ -3,6 +3,7 @@ gstglproto_dep = dependency('', required : false)
 gstglx11_dep = dependency('', required : false)
 gstglwayland_dep = dependency('', required : false)
 gstglegl_dep = dependency('', required : false)
+gstglviv_fb_dep = dependency('', required : false)
 
 if get_option('gl').disabled()
   message('GStreamer OpenGL integration disabled via options.')
@@ -111,6 +112,8 @@ gl_wayland_sources = []
 gl_wayland_headers = []
 gl_egl_sources = []
 gl_egl_headers = []
+gl_viv_fb_sources = []
+gl_viv_fb_headers = []
 
 glconf = configuration_data()
 glconf_options = [
@@ -926,15 +929,19 @@ if need_platform_egl != 'no' and need_win_viv_fb != 'no'
   if egl_dep.found() and cc.has_function ('fbGetDisplay', dependencies : egl_dep)
     enabled_gl_winsys += 'viv-fb'
     glconf.set('GST_GL_HAVE_WINDOW_VIV_FB', 1)
-    gl_priv_sources += [
+    gl_priv_sources += files([
       'viv-fb/gstgldisplay_viv_fb.c',
       'viv-fb/gstglwindow_viv_fb_egl.c',
-    ]
+    ])
+    gl_viv_fb_sources += files([
+      'viv-fb/gstgldisplay_viv_fb.c',
+    ])
+
     gl_cpp_args += ['-DEGL_API_FB']
-    gl_viv_fb_headers = [
+    gl_viv_fb_headers = files([
+      'viv-fb/gstglviv-fb.h',
       'viv-fb/gstgldisplay_viv_fb.h',
-    ]
-    install_headers(gl_viv_fb_headers, subdir : 'gstreamer-1.0/gst/gl/viv-fb')
+    ])
   endif
 endif
 
@@ -1056,7 +1063,7 @@ if build_gstgl
   common_args += '-I@0@'.format(meson.current_build_dir())
 
   gstgl = library('gstgl-' + api_version,
-    gl_sources, gl_egl_sources, gl_x11_sources, gl_wayland_sources, gl_priv_sources, gl_enumtypes_c, gl_enumtypes_h,
+    gl_sources, gl_egl_sources, gl_x11_sources, gl_wayland_sources, gl_viv_fb_sources, gl_priv_sources, gl_enumtypes_c, gl_enumtypes_h,
     c_args : common_args,
     cpp_args : common_args,
     objc_args : common_args + gl_objc_args,
@@ -1240,6 +1247,42 @@ if build_gstgl
     meson.override_dependency(pkg_name, gstglegl_dep)
   endif
 
+  if gl_viv_fb_headers.length() > 0
+    install_headers(gl_viv_fb_headers, subdir : 'gstreamer-1.0/gst/gl/viv-fb')
+    pkg_name = 'gstreamer-gl-viv-fb-1.0'
+    pkgconfig.generate(
+      libraries : [gstgl],
+      subdirs : pkgconfig_subdirs,
+      name : pkg_name,
+      description : 'Streaming media framework, OpenGL plugins libraries (Vivante Framebuffer specifics)',
+    )
+    gl_viv_fb_gir = []
+    if build_gir
+      gir = {
+        'sources' : gl_viv_fb_sources + gl_viv_fb_headers,
+        'namespace' : 'GstGLVivFB',
+        'nsversion' : api_version,
+        'identifier_prefix' : 'Gst',
+        'symbol_prefix' : 'gst',
+        'export_packages' : pkg_name,
+        'includes' : ['Gst-1.0', 'GstBase-1.0', 'GstVideo-1.0'],
+        'install' : true,
+        'extra_args' : gir_init_section + ['--c-include=gst/gl/viv-fb/gstglviv-fb.h'],
+        'dependencies' : [video_dep, gst_dep, gst_base_dep]
+      }
+      gir_dict = gir + {'includes': gir['includes'] + ['GstGL-1.0']}
+      gst_libraries += [[pkg_name, {'gir': gir_dict}]]
+      if not static_build
+        gir += {'includes': gir['includes'] + [gl_gir[0]]}
+        gl_viv_fb_gir = gnome.generate_gir(gstgl, kwargs: gir)
+        library_def += {'gir_targets':  library_def.get('gir_targets', []) + [gl_viv_fb_gir]}
+      endif
+    endif
+    gstglviv_fb_dep = declare_dependency(dependencies : [gstgl_dep],
+      sources : gl_viv_fb_gir)
+    meson.override_dependency(pkg_name, gstglviv_fb_dep)
+  endif
+
 elif get_option('gl').enabled()
   error('GStreamer OpenGL integration required via options, but needed dependencies not found.')
 endif

subprojects/gst-plugins-base/gst-libs/gst/gl/viv-fb/gstglviv-fb.h

@@ -0,0 +1,27 @@
+/*
+ * GStreamer
+ * Copyright (C) 2023 Matthew Waters <matthew@centricular.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef __GST_GL_VIV_FB_H__
+#define __GST_GL_VIV_FB_H__
+
+#include <gst/gl/gl.h>
+#include <gst/gl/viv-fb/gstgldisplay_viv_fb.h>
+
+#endif /* __GST_GL_VIV_FB_H__ */

subprojects/gst-plugins-good/ext/qt/gstqtglutility.cc

@@ -44,7 +44,7 @@
 #include <gst/gl/wayland/gstgldisplay_wayland.h>
 #endif
 
-#if GST_GL_HAVE_WINDOW_VIV_FB
+#if GST_GL_HAVE_WINDOW_VIV_FB && defined (HAVE_QT_VIV_FB)
 #include <gst/gl/viv-fb/gstgldisplay_viv_fb.h>
 #endif
 
@@ -117,7 +117,7 @@ gst_qt_get_gl_display (gboolean sink)
   }
 #elif GST_GL_HAVE_PLATFORM_EGL && defined (HAVE_QT_EGLFS)
   if (QString::fromUtf8("eglfs") == app->platformName()) {
-#if GST_GL_HAVE_WINDOW_VIV_FB
+#if GST_GL_HAVE_WINDOW_VIV_FB && defined (HAVE_QT_VIV_FB)
     /* FIXME: Could get the display directly from Qt like this
      * QPlatformNativeInterface *native =
      *     QGuiApplication::platformNativeInterface();
@@ -202,7 +202,7 @@ gst_qt_get_gl_wrapcontext (GstGLDisplay * display,
   }
 #endif
 #if GST_GL_HAVE_PLATFORM_EGL && defined (HAVE_QT_EGLFS)
-#if GST_GL_HAVE_WINDOW_VIV_FB
+#if GST_GL_HAVE_WINDOW_VIV_FB && defined (HAVE_QT_VIV_FB)
   if (GST_IS_GL_DISPLAY_VIV_FB (display)) {
 #else
   if (GST_IS_GL_DISPLAY_EGL (display)) {

subprojects/gst-plugins-good/ext/qt/meson.build

@@ -184,6 +184,17 @@ if host_system == 'ios'
   endif
 endif
 
+# EGL windowing for Vivante Framebuffer (e.g. i.MX6)
+qt5_viv_fb = qt5_egl \
+    .require(host_system == 'linux') \
+    .require(gstglviv_fb_dep.found(), error_message: 'gstreamer-gl-viv_fb-1.0 is required') \
+    .require(gst_gl_have_platform_egl, error_message: 'egl platform support in gstreamer-gl is required')
+if qt5_viv_fb.allowed()
+  qt_defines += ['-DHAVE_QT_VIV_FB']
+  optional_deps += gstglviv_fb_dep
+  have_qt_windowing = true
+endif
+
 if qt5_option.require(have_qt_windowing).allowed()
   # rpath is needed to be able to load the plugin on macOS inside the devenv
   qmlgl_kwargs = {}

subprojects/gst-plugins-good/meson.build

@@ -321,6 +321,7 @@ gstglproto_dep = dependency('', required : false)
 gstglx11_dep = dependency('', required : false)
 gstglwayland_dep = dependency('', required : false)
 gstglegl_dep = dependency('', required : false)
+gstglviv_fb_dep = dependency('', required : false)
 
 have_gstgl = gstgl_dep.found()
 
@@ -370,6 +371,10 @@ if have_gstgl
     gstglegl_dep = dependency('gstreamer-gl-egl-1.0', version : gst_req,
         fallback : ['gst-plugins-base', 'gstglegl_dep'], required: true)
   endif
+  if gst_gl_have_window_viv_fb
+    gstglviv_fb_dep = dependency('gstreamer-gl-viv-fb-1.0', version : gst_req,
+        fallback : ['gst-plugins-base', 'gstglviv_fb_dep'], required: true)
+  endif
 endif
 
 zlib_dep = dependency('zlib')