package/flutter-pi: new package

flutter-pi is one of many flutter-embedders. However, flutter-pi is unique
because it doesn't require X or Wayland to run. So long as there is support for
KMS and DRI flutter-pi should run on any platform that flutter-engine supports.

Signed-off-by: Adam Duskett <adam.duskett@amarulasolutions.com>
[yann.morin.1998@free.fr: drop unused BR2_PACKAGE_FLUTTER_PI_TEST_PLUGIN]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

DEVELOPERS

@@ -34,6 +34,7 @@ F:	package/vulkan-tools/
 N:	Adam Duskett <adam.duskett@amarulasolutions.com>
 F:	package/depot-tools/
 F:	package/flutter-engine/
+F:	package/flutter-pi/
 F:	package/flutter-sdk-bin/
 
 N:	Adam Heinrich <adam@adamh.cz>

package/Config.in

@@ -344,6 +344,7 @@ comment "Graphic libraries"
 	source "package/fbset/Config.in"
 	source "package/fbterm/Config.in"
 	source "package/fbv/Config.in"
+	source "package/flutter-pi/Config.in"
 	source "package/freerdp/Config.in"
 	source "package/graphicsmagick/Config.in"
 	source "package/imagemagick/Config.in"

package/flutter-pi/0001-src-egl_gbm_render_surface-properly-fallback-to-surf.patch

@@ -0,0 +1,59 @@
+From 856f9849763535d62ed01b538ba23905875c93f4 Mon Sep 17 00:00:00 2001
+From: "Yann E. MORIN" <yann.morin.1998@free.fr>
+Date: Tue, 26 Sep 2023 20:31:17 +0200
+Subject: [PATCH] src/egl_gbm_render_surface: properly fallback to surface with
+ no modifier
+
+In 869fa7fcfbeb, we added a fallback to be able to create an EGL sruface
+when the driver do not support modifiers, like the llvmpipe software
+renderer (or like some proprietary drivers, like the MALI ones), as
+reported in #269 [0].
+
+However, in c6537673c9b6, there was a big overhaul of renderer
+infrastructure. That commit lost the with-modifiers code path and only
+kept the without-modifiers fallback one (i.e. it only kept the call to
+gbm_surface_create(), not to gbm_surface_create_with_modifiers()).
+
+Then in b0d09f5032a4, the with-modifier code path was re-instated, but
+in a way that made it exclusive with the without-modifiers one. That is,
+the without-modifiers code path was not a fallback to when the other
+failed.
+
+Re-instate the fallback mechanism as intiially implemented.
+
+[0] https://github.com/ardera/flutter-pi/issues/269
+
+Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
+Upstream: https://github.com/ardera/flutter-pi/pull/367
+---
+ src/egl_gbm_render_surface.c | 6 ++++--
+ 1 file changed, 4 insertions(+), 2 deletions(-)
+
+diff --git a/src/egl_gbm_render_surface.c b/src/egl_gbm_render_surface.c
+index ce9e5e7..8a58667 100644
+--- a/src/egl_gbm_render_surface.c
++++ b/src/egl_gbm_render_surface.c
+@@ -146,6 +146,7 @@ static int egl_gbm_render_surface_init(
+     }
+ #endif
+ 
++    gbm_surface = NULL;
+     if (allowed_modifiers != NULL) {
+         gbm_surface = gbm_surface_create_with_modifiers(
+             gbm_device,
+@@ -158,9 +159,10 @@ static int egl_gbm_render_surface_init(
+         if (gbm_surface == NULL) {
+             ok = errno;
+             LOG_ERROR("Couldn't create GBM surface for rendering. gbm_surface_create_with_modifiers: %s\n", strerror(ok));
+-            return ok;
++            LOG_ERROR("Will retry without modifiers\n");
+         }
+-    } else {
++    }
++    if (gbm_surface == NULL) {
+         gbm_surface = gbm_surface_create(
+             gbm_device,
+             size.x,
+-- 
+2.25.1
+

package/flutter-pi/Config.in

@@ -0,0 +1,78 @@
+menuconfig BR2_PACKAGE_FLUTTER_PI
+	bool "flutter-pi"
+	depends on BR2_PACKAGE_FLUTTER_ENGINE
+	depends on BR2_PACKAGE_HAS_LIBGBM
+	depends on BR2_PACKAGE_SYSTEMD # Event loop and dbus support
+	depends on BR2_PACKAGE_HAS_UDEV # libinput
+	select BR2_PACKAGE_LIBDRM
+	select BR2_PACKAGE_LIBINPUT
+	select BR2_PACKAGE_LIBXKBCOMMON
+	help
+	  A light-weight Flutter Engine Embedder. Flutter-pi also
+	  runs without X11, so you don't need to boot into a
+	  Desktop & have X11 or Wayland load up; just boot into the
+	  command-line.
+
+	  Although flutter-pi is only tested on a Rasberry Pi 4
+	  2GB, it should work fine on other linux platforms supported
+	  by Flutter so long as there is support for KMS and DRI.
+
+	  https://github.com/ardera/flutter-pi
+
+if BR2_PACKAGE_FLUTTER_PI
+
+comment "plugins"
+
+config BR2_PACKAGE_FLUTTER_PI_GSTREAMER_AUDIO_PLAYER_PLUGIN
+	bool "gstreamer audio player"
+	depends on BR2_PACKAGE_HAS_LIBGLES
+	select BR2_PACKAGE_GSTREAMER1
+	select BR2_PACKAGE_GST1_PLUGINS_BASE
+	select BR2_PACKAGE_GST1_PLUGINS_BASE_PLUGIN_ALSA
+	select BR2_PACKAGE_GST1_PLUGINS_BASE_PLUGIN_AUDIOCONVERT
+	select BR2_PACKAGE_GST1_PLUGINS_BASE_PLUGIN_AUDIORESAMPLE
+	select BR2_PACKAGE_GST1_PLUGINS_BASE_PLUGIN_VOLUME
+	help
+	  Include the gstreamer based video plugins in the finished
+	  binary. Allows for more stable, hardware accelerated
+	  video playback in flutter using gstreamer.
+
+config BR2_PACKAGE_FLUTTER_PI_GSTREAMER_VIDEO_PLAYER_PLUGIN
+	bool "gstreamer video player"
+	depends on BR2_PACKAGE_HAS_LIBGLES
+	select BR2_PACKAGE_GSTREAMER1
+	select BR2_PACKAGE_GST1_PLUGINS_BASE
+	select BR2_PACKAGE_GST1_PLUGINS_BASE_LIB_OPENGL
+	select BR2_PACKAGE_GST1_PLUGINS_BASE_LIB_OPENGL_GLES2
+	select BR2_PACKAGE_GST1_PLUGINS_BASE_PLUGIN_VIDEOCONVERTSCALE
+	help
+	  Include the gstreamer based video plugins in the finished
+	  binary. Allows for more stable, hardware accelerated
+	  video playback in flutter using gstreamer.
+
+comment "gstreamer video player plugin needs an OpenGL ES backend"
+	depends on !BR2_PACKAGE_HAS_LIBGLES
+
+config BR2_PACKAGE_FLUTTER_PI_RAW_KEYBOARD_PLUGIN
+	bool "raw keyboard"
+	help
+	  Include the raw keyboard plugin in the finished binary.
+	  Enables raw keycode listening in flutter via the flutter
+	  RawKeyboard interface.
+
+config BR2_PACKAGE_FLUTTER_PI_TEXT_INPUT_PLUGIN
+	bool "text input"
+	help
+	  Include the text input plugin in the finished binary.
+	  Enables text input (to flutter text fields, for example)
+	  via attached keyboards.
+
+endif
+
+comment "flutter-pi needs flutter-engine"
+	depends on !BR2_PACKAGE_FLUTTER_ENGINE
+
+comment "flutter-pi needs GBM, systemd, and udev"
+	depends on !BR2_PACKAGE_HAS_LIBGBM || \
+		!BR2_PACKAGE_SYSTEMD || \
+		!BR2_PACKAGE_HAS_UDEV

package/flutter-pi/flutter-pi.hash

@@ -0,0 +1,3 @@
+# Locally calculated
+sha256  e4af79c8f53c15913f52a83a221f099a2a750d023a0bc4560d0db6f15def79a2  flutter-pi-d62e84350d2869b3ec1dfb1af21bfe234c4b817f-br1.tar.gz
+sha256  b34df9d3e1b4e5d1ba70b1740ec74b69f1189b44efd0c96b898b074ef8db1c70  LICENSE

package/flutter-pi/flutter-pi.mk

@@ -0,0 +1,85 @@
+################################################################################
+#
+# flutter-pi
+#
+################################################################################
+
+FLUTTER_PI_VERSION = d62e84350d2869b3ec1dfb1af21bfe234c4b817f
+FLUTTER_PI_SITE = https://github.com/ardera/flutter-pi.git
+FLUTTER_PI_SITE_METHOD = git
+FLUTTER_PI_LICENSE = MIT
+FLUTTER_PI_LICENSE_FILES = LICENSE
+FLUTTER_PI_DEPENDENCIES = \
+	flutter-engine \
+	libinput \
+	libxkbcommon \
+	systemd
+
+FLUTTER_PI_CONF_OPTS = \
+	-DDEBUG_DRM_PLANE_ALLOCATIONS=OFF \
+	-DDUMP_ENGINE_LAYERS=OFF \
+	-DENABLE_ASAN=OFF \
+	-DENABLE_MTRACE=OFF \
+	-DENABLE_SOFTWARE=OFF \
+	-DENABLE_TESTS=OFF \
+	-DENABLE_TSAN=OFF \
+	-DENABLE_UBSAN=OFF \
+	-DENABLE_VULKAN=OFF \
+	-DFILESYSTEM_LAYOUT=meta-flutter \
+	-DLINT_EGL_HEADERS=OFF \
+	-DTRY_BUILD_GSTREAMER_AUDIO_PLAYER_PLUGIN=OFF \
+	-DTRY_BUILD_GSTREAMER_VIDEO_PLAYER_PLUGIN=OFF \
+	-DTRY_ENABLE_OPENGL=OFF \
+	-DTRY_ENABLE_SESSION_SWITCHING=OFF \
+	-DTRY_ENABLE_VULKAN=OFF \
+	-DVULKAN_DEBUG="OFF" \
+	-DUSE_LEGACY_KMS=OFF \
+	-DWARN_MISSING_FIELD_INITIALIZERS=OFF
+
+ifeq ($(BR2_ENABLE_LTO),y)
+FLUTTER_PI_CONF_OPTS += -DLTO=ON
+else
+FLUTTER_PI_CONF_OPTS += -DLTO=OFF
+endif
+
+ifeq ($(BR2_PACKAGE_FLUTTER_PI_GSTREAMER_AUDIO_PLAYER_PLUGIN),y)
+FLUTTER_PI_DEPENDENCIES += gstreamer1 gst1-plugins-base
+FLUTTER_PI_CONF_OPTS += -DBUILD_GSTREAMER_AUDIO_PLAYER_PLUGIN=ON
+else
+FLUTTER_PI_CONF_OPTS += -DBUILD_GSTREAMER_AUDIO_PLAYER_PLUGIN=OFF
+endif
+
+ifeq ($(BR2_PACKAGE_FLUTTER_PI_GSTREAMER_VIDEO_PLAYER_PLUGIN),y)
+FLUTTER_PI_DEPENDENCIES += gstreamer1 gst1-plugins-base
+FLUTTER_PI_CONF_OPTS += -DBUILD_GSTREAMER_VIDEO_PLAYER_PLUGIN=ON
+else
+FLUTTER_PI_CONF_OPTS += -DBUILD_GSTREAMER_VIDEO_PLAYER_PLUGIN=OFF
+endif
+
+ifeq ($(BR2_PACKAGE_FLUTTER_PI_RAW_KEYBOARD_PLUGIN),y)
+FLUTTER_PI_CONF_OPTS += -DBUILD_RAW_KEYBOARD_PLUGIN=ON
+else
+FLUTTER_PI_CONF_OPTS += -DBUILD_RAW_KEYBOARD_PLUGIN=OFF
+endif
+
+ifeq ($(BR2_PACKAGE_FLUTTER_PI_TEXT_INPUT_PLUGIN),y)
+FLUTTER_PI_DEPENDENCIES += libinput libxkbcommon
+FLUTTER_PI_CONF_OPTS += -DBUILD_TEXT_INPUT_PLUGIN=ON
+else
+FLUTTER_PI_CONF_OPTS += -DBUILD_TEXT_INPUT_PLUGIN=OFF
+endif
+
+ifeq ($(BR2_PACKAGE_HAS_LIBGLES),y)
+FLUTTER_PI_CONF_OPTS += -DENABLE_OPENGL=ON
+else
+FLUTTER_PI_CONF_OPTS += -DENABLE_OPENGL=OFF
+endif
+
+ifeq ($(BR2_PACKAGE_SEATD),y)
+FLUTTER_PI_DEPENDENCIES += seatd
+FLUTTER_PI_CONF_OPTS += -DENABLE_SESSION_SWITCHING=ON
+else
+FLUTTER_PI_CONF_OPTS += -DENABLE_SESSION_SWITCHING=OFF
+endif
+
+$(eval $(cmake-package))