impeller::Playground::GLFWInitializer Struct Reference

Public Member Functions
	GLFWInitializer ()

Detailed Description

Definition at line 51 of file playground.cc.

Constructor & Destructor Documentation

GLFWInitializer()

impeller::Playground::GLFWInitializer::GLFWInitializer ( )

inline

Definition at line 52 of file playground.cc.

                    {
    // This guard is a hack to work around a problem where glfwCreateWindow
    // hangs when opening a second window after GLFW has been reinitialized (for
    // example, when flipping through multiple playground tests).
    //
    // Explanation:
    //  * glfwCreateWindow calls [NSApp run], which begins running the event
    //    loop on the current thread.
    //  * GLFW then immediately stops the loop when
    //    applicationDidFinishLaunching is fired.
    //  * applicationDidFinishLaunching is only ever fired once during the
    //    application's lifetime, so subsequent calls to [NSApp run] will always
    //    hang with this setup.
    //  * glfwInit resets the flag that guards against [NSApp run] being
    //    called a second time, which causes the subsequent `glfwCreateWindow`
    //    to hang indefinitely in the event loop, because
    //    applicationDidFinishLaunching is never fired.
    static std::once_flag sOnceInitializer;
    std::call_once(sOnceInitializer, []() {
      ::glfwSetErrorCallback([](int code, const char* description) {
        FML_LOG(ERROR) << "GLFW Error '" << description << "'  (" << code
                       << ").";
      });
      FML_CHECK(::glfwInit() == GLFW_TRUE);
    });
  }

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The documentation for this struct was generated from the following file:

• impeller/playground/playground.cc