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// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <cassert>
#include <chrono>
#include <iostream>
#include "GLFW/glfw3.h"
#include "embedder.h"
// This value is calculated after the window is created.
static double g_pixelRatio = 1.0;
static const size_t kInitialWindowWidth = 800;
static const size_t kInitialWindowHeight = 600;
static_assert(FLUTTER_ENGINE_VERSION == 1,
"This Flutter Embedder was authored against the stable Flutter "
"API at version 1. There has been a serious breakage in the "
"API. Please read the ChangeLog and take appropriate action "
"before updating this assertion");
void GLFWcursorPositionCallbackAtPhase(GLFWwindow* window,
FlutterPointerPhase phase,
double x,
double y) {
FlutterPointerEvent event = {};
event.struct_size = sizeof(event);
event.phase = phase;
event.x = x * g_pixelRatio;
event.y = y * g_pixelRatio;
event.timestamp =
std::chrono::duration_cast<std::chrono::microseconds>(
std::chrono::high_resolution_clock::now().time_since_epoch())
.count();
FlutterEngineSendPointerEvent(
reinterpret_cast<FlutterEngine>(glfwGetWindowUserPointer(window)), &event,
1);
}
void GLFWcursorPositionCallback(GLFWwindow* window, double x, double y) {
GLFWcursorPositionCallbackAtPhase(window, FlutterPointerPhase::kMove, x, y);
}
void GLFWmouseButtonCallback(GLFWwindow* window,
int key,
int action,
int mods) {
if (key == GLFW_MOUSE_BUTTON_1 && action == GLFW_PRESS) {
double x, y;
glfwGetCursorPos(window, &x, &y);
GLFWcursorPositionCallbackAtPhase(window, FlutterPointerPhase::kDown, x, y);
glfwSetCursorPosCallback(window, GLFWcursorPositionCallback);
}
if (key == GLFW_MOUSE_BUTTON_1 && action == GLFW_RELEASE) {
double x, y;
glfwGetCursorPos(window, &x, &y);
GLFWcursorPositionCallbackAtPhase(window, FlutterPointerPhase::kUp, x, y);
glfwSetCursorPosCallback(window, nullptr);
}
}
static void GLFWKeyCallback(GLFWwindow* window,
int key,
int scancode,
int action,
int mods) {
if (key == GLFW_KEY_ESCAPE && action == GLFW_PRESS) {
glfwSetWindowShouldClose(window, GLFW_TRUE);
}
}
void GLFWwindowSizeCallback(GLFWwindow* window, int width, int height) {
FlutterWindowMetricsEvent event = {};
event.struct_size = sizeof(event);
event.width = width * g_pixelRatio;
event.height = height * g_pixelRatio;
event.pixel_ratio = g_pixelRatio;
FlutterEngineSendWindowMetricsEvent(
reinterpret_cast<FlutterEngine>(glfwGetWindowUserPointer(window)),
&event);
}
bool RunFlutter(GLFWwindow* window,
const std::string& project_path,
const std::string& icudtl_path) {
FlutterRendererConfig config = {};
config.type = kOpenGL;
config.open_gl.struct_size = sizeof(config.open_gl);
config.open_gl.make_current = [](void* userdata) -> bool {
glfwMakeContextCurrent(static_cast<GLFWwindow*>(userdata));
return true;
};
config.open_gl.clear_current = [](void*) -> bool {
glfwMakeContextCurrent(nullptr); // is this even a thing?
return true;
};
config.open_gl.present = [](void* userdata) -> bool {
glfwSwapBuffers(static_cast<GLFWwindow*>(userdata));
return true;
};
config.open_gl.fbo_callback = [](void*) -> uint32_t {
return 0; // FBO0
};
config.open_gl.gl_proc_resolver = [](void*, const char* name) -> void* {
return reinterpret_cast<void*>(glfwGetProcAddress(name));
};
// This directory is generated by `flutter build bundle`.
std::string assets_path = project_path + "/build/flutter_assets";
FlutterProjectArgs args = {
.struct_size = sizeof(FlutterProjectArgs),
.assets_path = assets_path.c_str(),
.icu_data_path =
icudtl_path.c_str(), // Find this in your bin/cache directory.
};
FlutterEngine engine = nullptr;
FlutterEngineResult result =
FlutterEngineRun(FLUTTER_ENGINE_VERSION, &config, // renderer
&args, window, &engine);
if (result != kSuccess || engine == nullptr) {
std::cout << "Could not run the Flutter Engine." << std::endl;
return false;
}
glfwSetWindowUserPointer(window, engine);
GLFWwindowSizeCallback(window, kInitialWindowWidth, kInitialWindowHeight);
return true;
}
void printUsage() {
std::cout << "usage: embedder_example <path to project> <path to icudtl.dat>"
<< std::endl;
}
void GLFW_ErrorCallback(int error, const char* description) {
std::cout << "GLFW Error: (" << error << ") " << description << std::endl;
}
int main(int argc, const char* argv[]) {
if (argc != 3) {
printUsage();
return 1;
}
std::string project_path = argv[1];
std::string icudtl_path = argv[2];
glfwSetErrorCallback(GLFW_ErrorCallback);
int result = glfwInit();
if (result != GLFW_TRUE) {
std::cout << "Could not initialize GLFW." << std::endl;
return EXIT_FAILURE;
}
#if defined(__linux__)
glfwWindowHint(GLFW_CONTEXT_CREATION_API, GLFW_EGL_CONTEXT_API);
#endif
GLFWwindow* window = glfwCreateWindow(
kInitialWindowWidth, kInitialWindowHeight, "Flutter", NULL, NULL);
if (window == nullptr) {
std::cout << "Could not create GLFW window." << std::endl;
return EXIT_FAILURE;
}
int framebuffer_width, framebuffer_height;
glfwGetFramebufferSize(window, &framebuffer_width, &framebuffer_height);
g_pixelRatio = framebuffer_width / kInitialWindowWidth;
bool run_result = RunFlutter(window, project_path, icudtl_path);
if (!run_result) {
std::cout << "Could not run the Flutter engine." << std::endl;
return EXIT_FAILURE;
}
glfwSetKeyCallback(window, GLFWKeyCallback);
glfwSetWindowSizeCallback(window, GLFWwindowSizeCallback);
glfwSetMouseButtonCallback(window, GLFWmouseButtonCallback);
while (!glfwWindowShouldClose(window)) {
glfwWaitEvents();
}
glfwDestroyWindow(window);
glfwTerminate();
return EXIT_SUCCESS;
}