--- /dev/null
+include app_configuration.mk
+
+# Default build type.
+BUILD=debug
+
+FLUTTER_MANAGED_DIR=flutter
+FLUTTER_EPHEMERAL_DIR=$(FLUTTER_MANAGED_DIR)/ephemeral
+
+# Configuration provided via flutter tool.
+FLUTTER_CONFIG_FILE=$(FLUTTER_EPHEMERAL_DIR)/generated_config.mk
+include $(FLUTTER_CONFIG_FILE)
+
+# Dependency locations
+FLUTTER_APP_DIR=$(CURDIR)/..
+FLUTTER_APP_BUILD_DIR=$(FLUTTER_APP_DIR)/build
+
+OUT_DIR=$(FLUTTER_APP_BUILD_DIR)/linux
+OBJ_DIR=$(OUT_DIR)/obj/$(BUILD)
+
+# Libraries
+FLUTTER_LIB_NAME=flutter_linux_glfw
+FLUTTER_LIB=$(FLUTTER_EPHEMERAL_DIR)/lib$(FLUTTER_LIB_NAME).so
+
+# Tools
+FLUTTER_BIN=$(FLUTTER_ROOT)/bin/flutter
+LINUX_BUILD=$(FLUTTER_ROOT)/packages/flutter_tools/bin/tool_backend.sh
+
+# Resources
+ICU_DATA_NAME=icudtl.dat
+ICU_DATA_SOURCE=$(FLUTTER_EPHEMERAL_DIR)/$(ICU_DATA_NAME)
+FLUTTER_ASSETS_NAME=flutter_assets
+FLUTTER_ASSETS_SOURCE=$(FLUTTER_APP_BUILD_DIR)/$(FLUTTER_ASSETS_NAME)
+
+# Bundle structure
+BUNDLE_OUT_DIR=$(OUT_DIR)/$(BUILD)
+BUNDLE_DATA_DIR=$(BUNDLE_OUT_DIR)/data
+BUNDLE_LIB_DIR=$(BUNDLE_OUT_DIR)/lib
+
+BIN_OUT=$(BUNDLE_OUT_DIR)/$(BINARY_NAME)
+ICU_DATA_OUT=$(BUNDLE_DATA_DIR)/$(ICU_DATA_NAME)
+FLUTTER_LIB_OUT=$(BUNDLE_LIB_DIR)/$(notdir $(FLUTTER_LIB))
+ALL_LIBS_OUT=$(FLUTTER_LIB_OUT) \
+ $(foreach lib,$(EXTRA_BUNDLED_LIBRARIES),$(BUNDLE_LIB_DIR)/$(notdir $(lib)))
+
+# Add relevant code from the wrapper library, which is intended to be statically
+# built into the client.
+# Use abspath for the wrapper root, which can contain relative paths; the
+# intermediate build files will be based on the source path, which will cause
+# issues if they start with one or more '../'s.
+WRAPPER_ROOT=$(abspath $(FLUTTER_EPHEMERAL_DIR)/cpp_client_wrapper_glfw)
+WRAPPER_SOURCES= \
+ $(WRAPPER_ROOT)/flutter_window_controller.cc \
+ $(WRAPPER_ROOT)/plugin_registrar.cc \
+ $(WRAPPER_ROOT)/engine_method_result.cc
+
+# Use abspath for extra sources, which may also contain relative paths (see
+# note above about WRAPPER_ROOT).
+SOURCES=main.cc window_configuration.cc \
+ flutter/generated_plugin_registrant.cc \
+ $(WRAPPER_SOURCES) $(abspath $(EXTRA_SOURCES))
+
+# Headers
+WRAPPER_INCLUDE_DIR=$(WRAPPER_ROOT)/include
+INCLUDE_DIRS=$(FLUTTER_EPHEMERAL_DIR) $(WRAPPER_INCLUDE_DIR)
+
+# Build settings
+ifneq ($(strip $(SYSTEM_LIBRARIES)),)
+EXTRA_CPPFLAGS+=$(patsubst -I%,-isystem%,$(shell pkg-config --cflags $(SYSTEM_LIBRARIES)))
+EXTRA_LDFLAGS+=$(shell pkg-config --libs $(SYSTEM_LIBRARIES))
+endif
+CXX=clang++
+CPPFLAGS.release=-DNDEBUG
+CPPFLAGS.profile=$(CPPFLAGS.release)
+CXXFLAGS.release=-O2
+CXXFLAGS.profile=$(CXXFLAGS.release)
+CXXFLAGS=-std=c++14 -Wall -Werror $(CXXFLAGS.$(BUILD)) $(EXTRA_CXXFLAGS)
+CPPFLAGS=$(patsubst %,-I%,$(INCLUDE_DIRS)) \
+ $(CPPFLAGS.$(BUILD)) $(EXTRA_CPPFLAGS)
+LDFLAGS=-L$(BUNDLE_LIB_DIR) \
+ -l$(FLUTTER_LIB_NAME) \
+ $(EXTRA_LDFLAGS) \
+ -Wl,-rpath=\$$ORIGIN/lib
+
+# Intermediate files.
+OBJ_FILES=$(SOURCES:%.cc=$(OBJ_DIR)/%.o)
+DEPENDENCY_FILES=$(OBJ_FILES:%.o=%.d)
+
+# Targets
+
+.PHONY: all
+all: $(BIN_OUT) bundle
+
+# Add the plugin targets, and their associated settings.
+include $(FLUTTER_MANAGED_DIR)/generated_plugins.mk
+EXTRA_BUNDLED_LIBRARIES+=$(PLUGIN_LIBRARIES)
+EXTRA_LDFLAGS+=$(PLUGIN_LDFLAGS)
+EXTRA_CPPFLAGS+=$(PLUGIN_CPPFLAGS)
+
+# This is a phony target because the flutter tool cannot describe
+# its inputs and outputs yet.
+.PHONY: sync
+sync: $(FLUTTER_CONFIG_FILE)
+ $(LINUX_BUILD) linux-x64 $(BUILD)
+
+.PHONY: bundle
+bundle: $(ICU_DATA_OUT) $(ALL_LIBS_OUT) bundleflutterassets
+
+$(BIN_OUT): $(OBJ_FILES) $(ALL_LIBS_OUT)
+ mkdir -p $(@D)
+ $(CXX) $(CXXFLAGS) $(CPPFLAGS) $(OBJ_FILES) $(LDFLAGS) -o $@
+
+$(WRAPPER_SOURCES) $(FLUTTER_LIB) $(ICU_DATA_SOURCE) $(FLUTTER_ASSETS_SOURCE) \
+ $(PLUGIN_TARGETS): | sync
+
+# Plugin library bundling pattern.
+$(BUNDLE_LIB_DIR)/%: $(OUT_DIR)/%
+ mkdir -p $(BUNDLE_LIB_DIR)
+ cp $< $@
+
+$(FLUTTER_LIB_OUT): $(FLUTTER_LIB)
+ mkdir -p $(@D)
+ cp $< $@
+
+$(ICU_DATA_OUT): $(ICU_DATA_SOURCE)
+ mkdir -p $(@D)
+ cp $< $@
+
+-include $(DEPENDENCY_FILES)
+
+$(OBJ_DIR)/%.o : %.cc | sync
+ mkdir -p $(@D)
+ $(CXX) $(CXXFLAGS) $(CPPFLAGS) -MMD -c $< -o $@
+
+# Fully re-copy the assets directory on each build to avoid having to keep a
+# comprehensive list of all asset files here, which would be fragile to changes
+# in other files (e.g., adding a new font to pubspec.yaml).
+.PHONY: bundleflutterassets
+bundleflutterassets: $(FLUTTER_ASSETS_SOURCE)
+ mkdir -p $(BUNDLE_DATA_DIR)
+ rsync -rpu --delete $(FLUTTER_ASSETS_SOURCE) $(BUNDLE_DATA_DIR)
+
+.PHONY: clean
+clean:
+ rm -rf $(OUT_DIR); \
+ cd $(FLUTTER_APP_DIR); \
+ $(FLUTTER_BIN) clean
--- /dev/null
+# Plugins to include in the build.
+GENERATED_PLUGINS=\
+
+GENERATED_PLUGINS_DIR=flutter/ephemeral/.plugin_symlinks
+# A plugin library name plugin name with _plugin appended.
+GENERATED_PLUGIN_LIB_NAMES=$(foreach plugin,$(GENERATED_PLUGINS),$(plugin)_plugin)
+
+# Variables for use in the enclosing Makefile. Changes to these names are
+# breaking changes.
+PLUGIN_TARGETS=$(GENERATED_PLUGINS)
+PLUGIN_LIBRARIES=$(foreach plugin,$(GENERATED_PLUGIN_LIB_NAMES),\
+ $(OUT_DIR)/lib$(plugin).so)
+PLUGIN_LDFLAGS=$(patsubst %,-l%,$(GENERATED_PLUGIN_LIB_NAMES))
+PLUGIN_CPPFLAGS=$(foreach plugin,$(GENERATED_PLUGINS),\
+ -I$(GENERATED_PLUGINS_DIR)/$(plugin)/linux)
+
+# Targets
+
+# Implicit rules don't match phony targets, so list plugin builds explicitly.
+
+.PHONY: $(GENERATED_PLUGINS)
+$(GENERATED_PLUGINS):
+ make -C $(GENERATED_PLUGINS_DIR)/$@/linux \
+ OUT_DIR=$(OUT_DIR) \
+ FLUTTER_EPHEMERAL_DIR="$(abspath flutter/ephemeral)"
--- /dev/null
+#include <flutter/flutter_window_controller.h>
+#include <linux/limits.h>
+#include <unistd.h>
+
+#include <cstdlib>
+#include <iostream>
+#include <memory>
+#include <vector>
+
+#include "flutter/generated_plugin_registrant.h"
+#include "window_configuration.h"
+
+namespace {
+
+// Returns the path of the directory containing this executable, or an empty
+// string if the directory cannot be found.
+std::string GetExecutableDirectory() {
+ char buffer[PATH_MAX + 1];
+ ssize_t length = readlink("/proc/self/exe", buffer, sizeof(buffer));
+ if (length > PATH_MAX) {
+ std::cerr << "Couldn't locate executable" << std::endl;
+ return "";
+ }
+ std::string executable_path(buffer, length);
+ size_t last_separator_position = executable_path.find_last_of('/');
+ if (last_separator_position == std::string::npos) {
+ std::cerr << "Unabled to find parent directory of " << executable_path
+ << std::endl;
+ return "";
+ }
+ return executable_path.substr(0, last_separator_position);
+}
+
+} // namespace
+
+int main(int argc, char **argv) {
+ // Resources are located relative to the executable.
+ std::string base_directory = GetExecutableDirectory();
+ if (base_directory.empty()) {
+ base_directory = ".";
+ }
+ std::string data_directory = base_directory + "/data";
+ std::string assets_path = data_directory + "/flutter_assets";
+ std::string icu_data_path = data_directory + "/icudtl.dat";
+
+ // Arguments for the Flutter Engine.
+ std::vector<std::string> arguments;
+
+ flutter::FlutterWindowController flutter_controller(icu_data_path);
+ flutter::WindowProperties window_properties = {};
+ window_properties.title = kFlutterWindowTitle;
+ window_properties.width = kFlutterWindowWidth;
+ window_properties.height = kFlutterWindowHeight;
+
+ // Start the engine.
+ if (!flutter_controller.CreateWindow(window_properties, assets_path,
+ arguments)) {
+ return EXIT_FAILURE;
+ }
+ RegisterPlugins(&flutter_controller);
+
+ // Run until the window is closed.
+ while (flutter_controller.RunEventLoopWithTimeout(
+ std::chrono::milliseconds::max())) {
+ }
+ return EXIT_SUCCESS;
+}