feat: on frame listener

include/window.h

@@ -3,6 +3,7 @@
 #define H_WINDOW_
 
 #include <cstddef>
+#include <functional>
 
 #include <EGL/egl.h>
 #include <EGL/eglext.h>
@@ -10,6 +11,8 @@
 
 #define UNUSED(x) (void)(x)
 
+typedef std::function<void()> IFrameListener;
+
 class WindowImpl {
 public:
 	WindowImpl() = default;
@@ -19,6 +22,7 @@ public:
 	WindowImpl(WindowImpl&&) = delete;
 protected:
 	virtual bool Dispatch() = 0;
+	virtual void OnFrame(IFrameListener fn) = 0;
 
 	virtual size_t GetWidth() const = 0;
 	virtual size_t GetHeight() const = 0;
@@ -39,6 +43,10 @@ public:
 	size_t GetWidth() const;
 	size_t GetHeight() const;
 
+public:
+  void Run();
+	void OnFrame(IFrameListener fn);
+
 private:
 	WindowImpl* m_impl;
 

include/window/wayland.h

@@ -10,6 +10,7 @@ public:
 
 public:
 	bool Dispatch() override;
+	void OnFrame(IFrameListener fn) override;
 
 	size_t GetWidth() const override;
 	size_t GetHeight() const override;
@@ -45,5 +46,7 @@ private:
 
 	bool m_running = false;
 	size_t m_width, m_height;
+
+	IFrameListener m_on_frame;
 };
 

src/main.cpp

@@ -5,18 +5,22 @@
 
 #define UNUSED(x) (void)(x)
 
+static Window window(720, 480);
+
+void HandleFrame() {
+		printf("[APP]: width = %zu, height = %zu\n", window.GetWidth(), window.GetHeight());
+}
+
 int main(int argc, char **argv) {
   UNUSED(argc);
   UNUSED(argv);
 
 	Renderer::GetInstance();
 
-	Window window(720, 480);
+	window.OnFrame(HandleFrame);
 
-	printf("[APP]: starting window");
-	while (window.Running()) {
-		printf("[APP]: width = %zu, height = %zu\n", window.GetWidth(), window.GetHeight());
-	}
+	printf("[APP]: starting window\n");
+	window.Run();
 
   return 0;
 }

src/window.cpp

@@ -22,3 +22,7 @@ size_t Window::GetHeight() const { return m_impl->GetHeight(); }
 
 bool Window::Running() const { return m_running && m_impl->Dispatch(); }
 
+void Window::OnFrame(IFrameListener fn) { m_impl->OnFrame(fn); }
+
+void Window::Run() { printf("[DEBUG(Window)]: Run() starts\n"); m_running = true; while(Running()) {}; }
+

src/window/wayland.cpp

@@ -1,6 +1,8 @@
 #include <stdio.h>
+#include <wayland-client-core.h>
 
 #include "state/wayland.h"
+#include "window.h"
 #include "window/wayland.h"
 
 #include "renderer.h"
@@ -88,19 +90,24 @@ WaylandWindowImpl::WaylandWindowImpl(size_t width, size_t height)
   m_toplevel_listener.close = xtoplevel_handle_close;
   m_toplevel_listener.wm_capabilities = xtoplevel_handle_wm_capabilities;
   xdg_toplevel_add_listener(m_toplevel, &m_toplevel_listener, this);
-
-  wl_surface_commit(m_wsurface);
-
-  m_running = true;
 }
 
 WaylandWindowImpl::~WaylandWindowImpl() { m_running = false; }
 
-bool WaylandWindowImpl::Dispatch() {
-  return m_running &&
-         wl_display_dispatch(WaylandState::GetInstance()->m_display) != -1;
+void WaylandWindowImpl::OnFrame(IFrameListener fn) {
+	m_on_frame = fn;
 }
 
+bool WaylandWindowImpl::Dispatch() {
+  wl_surface_commit(m_wsurface);
+
+  m_running = true;
+
+	auto display = WaylandState::GetInstance()->m_display;
+
+	// wl_display_dispatch_pending(display);
+	return wl_display_dispatch(display) != -1; }
+
 size_t WaylandWindowImpl::GetWidth() const {
 	return m_width;
 }
@@ -125,6 +132,8 @@ void WaylandWindowImpl::handle_frame_callback(void *data,
 
   wl_callback_add_listener(frame_callback, &window->m_frame_listener, window);
 
+	if (window->m_on_frame) window->m_on_frame();
+
   GLint angle_loc = glGetUniformLocation(window->m_program, "angle");
 
   static float angle = 0.0f;