feat: event system

Makefile

@@ -1,8 +1,8 @@
 CFLAGS = -Wall -Wextra -I./include/ -g
-LIBS = $(shell pkg-config --libs wayland-client wayland-egl egl glesv2)
+LIBS = $(shell pkg-config --libs wayland-client wayland-egl egl glesv2 wayland-cursor)
 
-build/main: src/main.cpp build/shader.o build/state.o build/renderer.o build/window.o build/window_wayland.o build/xdg-shell-protocol.o
-	g++ -o build/main $(CFLAGS) src/main.cpp build/shader.o build/state.o build/renderer.o build/window.o build/window_wayland.o build/xdg-shell-protocol.o $(LIBS)
+build/main: src/main.cpp build/shader.o build/state.o build/renderer.o build/window.o build/window_wayland.o build/input.o build/input_wayland.o build/event.o build/event_input.o build/xdg-shell-protocol.o
+	g++ -o build/main $(CFLAGS) src/main.cpp build/shader.o build/state.o build/renderer.o build/window.o build/window_wayland.o build/input.o build/input_wayland.o build/event.o build/event_input.o build/xdg-shell-protocol.o $(LIBS)
 
 build/shader.o: src/shader.cpp include/shader.h
 	g++ -o build/shader.o $(CFLAGS) -c src/shader.cpp
@@ -21,6 +21,19 @@ build/window.o: src/window.cpp include/window.h
 build/window_wayland.o: include/window/wayland.h src/window/wayland.cpp
 	g++ -o build/window_wayland.o $(CFLAGS) -c src/window/wayland.cpp
 
+build/input.o: src/input.cpp include/input.h
+	g++ -o build/input.o $(CFLAGS) -c src/input.cpp
+
+# TODO: dynamic input impl selection depending on platform (wayland/x11)
+build/input_wayland.o: include/input/wayland.h src/input/wayland.cpp
+	g++ -o build/input_wayland.o $(CFLAGS) -c src/input/wayland.cpp
+
+build/event.o: src/event.cpp include/event.h
+	g++ -o build/event.o $(CFLAGS) -c src/event.cpp
+	
+build/event_input.o: src/event/input.cpp include/event/input.h
+	g++ -o build/event_input.o $(CFLAGS) -c src/event/input.cpp
+
 build/xdg-shell-protocol.o: src/xdg-shell-protocol.c
 	gcc -o build/xdg-shell-protocol.o -c $(CFLAGS) $(LIBS) src/xdg-shell-protocol.c
 

include/event.h

@@ -0,0 +1,59 @@
+#pragma once
+#ifndef EVENT_H_
+#define EVENT_H_
+
+#include <stdbool.h>
+#include <stddef.h>
+
+enum class EventType : unsigned int {
+	// ----- INPUT -----
+	INPUT						= 1 << 0,
+	// Mouse
+	MOUSE						= 1 << 1,
+	MOUSE_MOVED			= 1 << 2,
+};
+
+constexpr EventType operator|(EventType a, EventType b) {
+    return static_cast<EventType>(
+        static_cast<unsigned int>(a) |
+        static_cast<unsigned int>(b)
+    );
+}
+
+constexpr EventType operator&(EventType a, EventType b) {
+    return static_cast<EventType>(
+        static_cast<unsigned int>(a) &
+        static_cast<unsigned int>(b)
+    );
+}
+
+constexpr EventType operator~(EventType a) {
+    return static_cast<EventType>(
+        ~static_cast<unsigned int>(a)
+    );
+}
+
+struct Event {
+public:
+	Event();
+	virtual ~Event() = default;
+
+public:
+	virtual EventType GetType() const = 0;
+
+public:
+	void Handle();
+	size_t Id() const;
+
+public:
+	bool IsHandled() const;
+
+private:
+	bool m_handled;
+	size_t m_id;
+
+private:
+	static size_t s_id_counter;
+};
+
+#endif // EVENT_H_

include/event/input.h

@@ -0,0 +1,37 @@
+#pragma once
+#ifndef H_INPUT_EVENT_
+#define H_INPUT_EVENT_
+
+#include "event.h"
+
+struct InputEvent : public Event {
+public:
+	InputEvent() = default;
+	~InputEvent() = default;
+
+public:
+	EventType GetType() const override;
+};
+
+struct MouseEvent : public InputEvent {
+public:
+	MouseEvent(EventType type);
+	~MouseEvent() = default;
+
+public:
+	EventType GetType() const override;
+
+private:
+	EventType m_mouse_type;
+};
+
+struct MouseMoveEvent : public MouseEvent {
+public:
+	MouseMoveEvent(size_t x, size_t y);
+	~MouseMoveEvent() = default;
+public:
+	size_t x;
+	size_t y;
+};
+
+#endif // H_INPUT_EVENT_

include/input.h

@@ -0,0 +1,33 @@
+#pragma once
+#ifndef H_INPUT_
+#define H_INPUT_
+
+#include <cstddef>
+
+class InputHandlerImpl {
+public:
+	InputHandlerImpl() = default;
+	virtual ~InputHandlerImpl() = default;
+
+public:
+	virtual size_t GetMouseX() = 0;
+	virtual size_t GetMouseY() = 0;
+};
+
+class InputHandler {
+public:
+	static InputHandler* GetInstance() {
+		if (!s_instance) s_instance = new InputHandler;
+		return s_instance;
+	}
+private:
+	InputHandler();
+public:
+	size_t GetMouseX();
+	size_t GetMouseY();
+private:
+	static InputHandler* s_instance;
+	InputHandlerImpl* m_impl;
+};
+
+#endif // H_INPUT_

include/input/wayland.h

@@ -0,0 +1,78 @@
+#pragma once
+#ifndef H_WAYLAND_INPUT_
+#define H_WAYLAND_INPUT_
+
+#include "input.h"
+
+#include <vector>
+#include <wayland-client-protocol.h>
+
+#include "event.h"
+
+class WaylandInputHandler : public InputHandlerImpl {
+private:
+	static void handle_pointer_enter(void *data,
+		      struct wl_pointer *wl_pointer,
+		      uint32_t serial,
+		      struct wl_surface *surface,
+		      wl_fixed_t surface_x,
+		      wl_fixed_t surface_y);
+	static void handle_pointer_leave(void *data,
+		      struct wl_pointer *wl_pointer,
+		      uint32_t serial,
+		      struct wl_surface *surface);
+	static void handle_pointer_motion(void *data,
+		       struct wl_pointer *wl_pointer,
+		       uint32_t time,
+		       wl_fixed_t surface_x,
+		       wl_fixed_t surface_y);
+	static void handle_pointer_button(void *data,
+		       struct wl_pointer *wl_pointer,
+		       uint32_t serial,
+		       uint32_t time,
+		       uint32_t button,
+		       uint32_t state);
+	static void handle_pointer_axis(void *data,
+		     struct wl_pointer *wl_pointer,
+		     uint32_t time,
+		     uint32_t axis,
+		     wl_fixed_t value);
+	static void handle_pointer_frame(void *data,
+		      struct wl_pointer *wl_pointer);
+	static void handle_pointer_axis_source(void *data,
+			    struct wl_pointer *wl_pointer,
+			    uint32_t axis_source);
+	static void handle_pointer_axis_stop(void *data,
+			  struct wl_pointer *wl_pointer,
+			  uint32_t time,
+			  uint32_t axis);
+	static void handle_pointer_axis_discrete(void *data,
+			      struct wl_pointer *wl_pointer,
+			      uint32_t axis,
+			      int32_t discrete);
+	static void handle_pointer_axis_value120(void *data,
+			      struct wl_pointer *wl_pointer,
+			      uint32_t axis,
+			      int32_t value120);
+	static void handle_pointer_axis_relative_direction(void *data,
+					struct wl_pointer *wl_pointer,
+					uint32_t axis,
+					uint32_t direction);
+private:
+	WaylandInputHandler();
+	~WaylandInputHandler() = default;
+
+	friend class InputHandler;
+public:
+	size_t GetMouseX() override;
+	size_t GetMouseY() override;
+private:
+	struct wl_pointer_listener m_pointer_listener;
+	wl_fixed_t m_surface_x;
+	wl_fixed_t m_surface_y;
+private:
+	std::vector<Event*> m_event_queue;
+};
+
+#endif // H_WAYLAND_INPUT_
+

include/state/wayland.h

@@ -19,6 +19,12 @@ private:
   static void registry_handle_global_remove(void *data,
                                             struct wl_registry *registry,
                                             uint32_t name);
+	static void seat_handle_capabilities(void *data,
+			     struct wl_seat *seat,
+			     uint32_t capabilities);
+	static void seat_handle_name(void *data,
+		     struct wl_seat *seat,
+		     const char *name);
 private:
   WaylandState();
 	~WaylandState();
@@ -33,8 +39,15 @@ private:
   struct xdg_wm_base_listener m_wm_base_listener;
   struct wl_registry_listener m_reg_listener;
 
+	struct wl_shm *m_shm;
+
+	struct wl_seat *m_seat;
+	struct wl_seat_listener m_seat_listener;
+	struct wl_pointer* m_pointer;
+
   friend class WaylandWindowImpl;
   friend class Renderer;
+	friend class WaylandInputHandler;
 };
 
 #endif // H_WAYLAND_STATE_

include/window.h

@@ -35,6 +35,8 @@ public:
   Window(size_t width, size_t height);
   virtual ~Window();
 
+	static void Init();
+
   Window(const Window &) = delete;
   Window(Window &&) = delete;
 

include/window/wayland.h

@@ -8,6 +8,8 @@ public:
 	WaylandWindowImpl(size_t width, size_t height);
 	~WaylandWindowImpl() override;
 
+	static void Init();
+
 public:
 	bool Dispatch() override;
 	void OnFrame(IFrameListener fn) override;

src/event.cpp

@@ -0,0 +1,18 @@
+#include "event.h"
+
+size_t Event::s_id_counter = 0;
+
+Event::Event() : m_id(s_id_counter++) {}
+
+void Event::Handle() {
+	m_handled = true;
+}
+
+bool Event::IsHandled() const {
+	return m_handled;
+}
+
+size_t Event::Id() const {
+	return m_id;
+}
+

src/event/input.cpp

@@ -0,0 +1,15 @@
+#include "event/input.h"
+#include "event.h"
+
+EventType InputEvent::GetType() const {
+	return EventType::INPUT;
+}
+
+MouseEvent::MouseEvent(EventType type) : InputEvent(), m_mouse_type(type) {}
+
+EventType MouseEvent::GetType() const {
+	return InputEvent::GetType() | EventType::MOUSE | m_mouse_type;
+}
+
+MouseMoveEvent::MouseMoveEvent() : MouseEvent(EventType::MOUSE_MOVED) {}
+

src/input.cpp

@@ -0,0 +1,25 @@
+#include "input.h"
+
+#include <assert.h>
+#include "input/wayland.h"
+
+InputHandler* InputHandler::s_instance = nullptr;
+
+// TODO: dynamically load input handling implementation depending on platform
+#define WAYLAND 1
+
+InputHandler::InputHandler() {
+#ifdef WAYLAND
+	m_impl = new WaylandInputHandler();
+#endif
+	assert(m_impl && "no implementation found for this platform");
+}
+
+size_t InputHandler::GetMouseX() {
+	return m_impl->GetMouseX();
+}
+
+size_t InputHandler::GetMouseY() {
+	return m_impl->GetMouseY();
+}
+

src/input/wayland.cpp

@@ -0,0 +1,157 @@
+#include <cassert>
+#include <stdio.h>
+
+#include "input/wayland.h"
+#include "event/input.h"
+#include "state/wayland.h"
+#include <wayland-client-core.h>
+#include <wayland-client-protocol.h>
+#include <wayland-util.h>
+#include <wayland-cursor.h>
+
+#define UNUSED(x) (void)(x)
+
+WaylandInputHandler::WaylandInputHandler() {
+  auto pointer = WaylandState::GetInstance()->m_pointer;
+	assert(pointer && "wayland seat_pointer not initialized");
+	m_pointer_listener.enter = handle_pointer_enter;
+	m_pointer_listener.leave = handle_pointer_leave;
+	m_pointer_listener.motion = handle_pointer_motion;
+	m_pointer_listener.button = handle_pointer_button;
+	m_pointer_listener.axis = handle_pointer_axis;
+	m_pointer_listener.frame = handle_pointer_frame;
+	m_pointer_listener.axis_source = handle_pointer_axis_source;
+	m_pointer_listener.axis_stop = handle_pointer_axis_stop;
+	m_pointer_listener.axis_discrete = handle_pointer_axis_discrete;
+	m_pointer_listener.axis_value120 = handle_pointer_axis_value120;
+	m_pointer_listener.axis_relative_direction = handle_pointer_axis_relative_direction;
+  wl_pointer_add_listener(pointer, &m_pointer_listener, this);
+}
+
+size_t WaylandInputHandler::GetMouseX() {
+	return wl_fixed_to_double(m_surface_x);
+}
+
+size_t WaylandInputHandler::GetMouseY() {
+	return wl_fixed_to_double(m_surface_y);
+}
+
+void WaylandInputHandler::handle_pointer_enter(
+    void *data, struct wl_pointer *wl_pointer, uint32_t serial,
+    struct wl_surface *surface, wl_fixed_t surface_x, wl_fixed_t surface_y) {
+	UNUSED(wl_pointer);
+	UNUSED(surface);
+	auto handler = reinterpret_cast<WaylandInputHandler*>(data);
+	// auto state = WaylandState::GetInstance();
+	printf("[DEBUG] INPUT.POINTER: pointer enter event:\n\tserial = %d, surface_x = %f, surface_y = %f\n", serial, wl_fixed_to_double(surface_x), wl_fixed_to_double(surface_y));
+	handler->m_surface_x = surface_x;
+	handler->m_surface_y = surface_y;
+	// const char* cursor_theme = "XCursor-Pro-Dark";
+	// auto theme = wl_cursor_theme_load(cursor_theme, 22, state->m_shm);
+	// printf("[DEBUG] CURSOR: theme '%s' loaded: %p\n", cursor_theme, theme);
+	// auto cursor = wl_cursor_theme_get_cursor(theme, "hand2");
+	// printf("[DEBUG] CURSOR: cursor found (%p) with %u images\n", cursor, cursor->image_count);
+	// auto buffer = wl_cursor_image_get_buffer(*cursor->images);
+	// printf("[DEBUG] CURSOR: buffer for cursor '%s' loaded (%p)\n", cursor->name, buffer);
+	// auto pointer_surface = wl_compositor_create_surface(state->m_compositor);
+	// wl_pointer_set_cursor(state->m_pointer, serial, pointer_surface, cursor->images[0]->hotspot_x, cursor->images[0]->hotspot_y);
+	// wl_surface_attach(pointer_surface, buffer, 0, 0);
+	// wl_surface_commit(pointer_surface);
+}
+
+void WaylandInputHandler::handle_pointer_leave(void *data,
+                                               struct wl_pointer *wl_pointer,
+                                               uint32_t serial,
+                                               struct wl_surface *surface) {
+	UNUSED(data);
+	UNUSED(wl_pointer);
+	UNUSED(serial);
+	UNUSED(surface);
+}
+
+void WaylandInputHandler::handle_pointer_motion(void *data,
+                                                struct wl_pointer *pointer,
+                                                uint32_t time,
+                                                wl_fixed_t surface_x,
+                                                wl_fixed_t surface_y) {
+	UNUSED(pointer);
+	UNUSED(time);
+	auto handler = reinterpret_cast<WaylandInputHandler*>(data);
+	handler->m_surface_x = surface_x;
+	handler->m_surface_y = surface_y;
+	handler->m_event_queue.push_back(new MouseMoveEvent(surface_x, surface_y));
+}
+
+void WaylandInputHandler::handle_pointer_button(void *data,
+                                                struct wl_pointer *wl_pointer,
+                                                uint32_t serial, uint32_t time,
+                                                uint32_t button,
+                                                uint32_t state) {
+	UNUSED(data);
+	UNUSED(wl_pointer);
+	UNUSED(serial);
+	UNUSED(button);
+	UNUSED(state);
+	UNUSED(time);
+}
+
+void WaylandInputHandler::handle_pointer_axis(void *data,
+                                              struct wl_pointer *wl_pointer,
+                                              uint32_t time, uint32_t axis,
+                                              wl_fixed_t value) {
+	UNUSED(data);
+	UNUSED(wl_pointer);
+	UNUSED(axis);
+	UNUSED(value);
+	UNUSED(time);
+}
+
+void WaylandInputHandler::handle_pointer_frame(void *data,
+                                               struct wl_pointer *wl_pointer) {
+	printf("[DEBUG] INPUT.POINTER: received pointer frame event\n");
+	UNUSED(data);
+	UNUSED(wl_pointer);
+}
+
+void WaylandInputHandler::handle_pointer_axis_source(
+    void *data, struct wl_pointer *wl_pointer, uint32_t axis_source) {
+	UNUSED(data);
+	UNUSED(wl_pointer);
+	UNUSED(axis_source);
+}
+
+void WaylandInputHandler::handle_pointer_axis_stop(
+    void *data, struct wl_pointer *wl_pointer, uint32_t time, uint32_t axis) {
+	UNUSED(data);
+	UNUSED(wl_pointer);
+	UNUSED(time);
+	UNUSED(axis);
+}
+
+void WaylandInputHandler::handle_pointer_axis_discrete(
+    void *data, struct wl_pointer *wl_pointer, uint32_t axis,
+    int32_t discrete) {
+	UNUSED(data);
+	UNUSED(wl_pointer);
+	UNUSED(axis);
+	UNUSED(discrete);
+}
+
+void WaylandInputHandler::handle_pointer_axis_value120(
+    void *data, struct wl_pointer *wl_pointer, uint32_t axis,
+    int32_t value120) {
+	UNUSED(data);
+	UNUSED(value120);
+	UNUSED(axis);
+	UNUSED(wl_pointer);
+}
+
+void WaylandInputHandler::handle_pointer_axis_relative_direction(
+    void *data, struct wl_pointer *wl_pointer, uint32_t axis,
+    uint32_t direction) {
+	UNUSED(data);
+	UNUSED(direction);
+	UNUSED(axis);
+	UNUSED(wl_pointer);
+}
+

src/main.cpp

@@ -1,5 +1,6 @@
 #include <stdio.h>
 
+#include "input.h"
 #include "window.h"
 #include "renderer.h"
 
@@ -9,6 +10,13 @@ static Window window(720, 480);
 
 void HandleFrame() {
 		printf("[APP]: width = %zu, height = %zu\n", window.GetWidth(), window.GetHeight());
+		auto x = InputHandler::GetInstance()->GetMouseX();
+		auto y = InputHandler::GetInstance()->GetMouseY();
+		printf("[APP]: mouse position: x = %zu, y = %zu\n", x, y);
+}
+
+void HandleMouseMove() {
+		printf("[APP]: mouse moved");
 }
 
 int main(int argc, char **argv) {
@@ -16,6 +24,7 @@ int main(int argc, char **argv) {
   UNUSED(argv);
 
 	Renderer::GetInstance();
+	Window::Init();
 
 	window.OnFrame(HandleFrame);
 

src/state/wayland.cpp

@@ -48,6 +48,54 @@ void WaylandState::registry_handle_global(void *data, struct wl_registry *regist
 		xdg_wm_base_add_listener(state->m_wm_base, &state->m_wm_base_listener,
 				NULL);
 	}
+	if (interface_name == "wl_seat") {
+		state->m_seat = reinterpret_cast<struct wl_seat *>(
+				wl_registry_bind(registry, name, &wl_seat_interface, version));
+		printf("[DEBUG] global_binding(%s): wl_seat %p\n", interface,
+				state->m_seat);
+		if (state->m_seat == NULL) {
+			fprintf(stderr, "ERROR: could not bind to wl_seat\n");
+		}
+		state->m_seat_listener.capabilities = seat_handle_capabilities;
+		state->m_seat_listener.name = seat_handle_name;
+		wl_seat_add_listener(state->m_seat, &state->m_seat_listener, state);
+	}
+	if (interface_name == "wl_shm") {
+		state->m_shm = reinterpret_cast<struct wl_shm *>(
+				wl_registry_bind(registry, name, &wl_shm_interface, version));
+		printf("[DEBUG] global_binding(%s): wl_shm %p\n", interface,
+				state->m_shm);
+		if (state->m_shm == NULL) {
+			fprintf(stderr, "ERROR: could not bind to wl_shm\n");
+		}
+	}
+}
+
+void WaylandState::seat_handle_name(void *data,
+		struct wl_seat *seat,
+		const char *name) {
+	UNUSED(seat);
+	UNUSED(data);
+	printf("[DEBUG] SEAT: name of the seat = %s\n", name);
+}
+
+void WaylandState::seat_handle_capabilities(void *data,
+		struct wl_seat *seat,
+		uint32_t capabilities) {
+	auto state = reinterpret_cast<WaylandState *>(data);
+	UNUSED(state);
+	UNUSED(seat);
+	if ((capabilities & WL_SEAT_CAPABILITY_KEYBOARD) > 0) {
+		printf("[DEBUG] SEAT: keyboard is available\n");
+	}
+	if ((capabilities & WL_SEAT_CAPABILITY_POINTER) > 0) {
+		printf("[DEBUG] SEAT: pointer is available\n");
+		state->m_pointer = wl_seat_get_pointer(seat);
+		printf("[DEBUG] SEAT: pointer is bound under %p address\n", state->m_pointer);
+	}
+	if ((capabilities & WL_SEAT_CAPABILITY_TOUCH) > 0) {
+		printf("[DEBUG] SEAT: touch is available\n");
+	}
 }
 
 void WaylandState::registry_handle_global_remove(void *data,

src/window.cpp

@@ -1,6 +1,7 @@
 #include <stdio.h>
 
 #include "window.h"
+#include "state/wayland.h"
 
 #define WINDOW_WAYLAND 1
 
@@ -15,6 +16,14 @@ Window::Window(size_t width, size_t height)
 #endif
 }
 
+void Window::Init() {
+#ifdef WINDOW_WAYLAND
+	printf("[DEBUG] Window::Init() called\n");
+	WaylandState::GetInstance();
+	WaylandWindowImpl::Init();
+#endif
+}
+
 Window::~Window() {}
 
 size_t Window::GetWidth() const { return m_impl->GetWidth(); }

src/window/wayland.cpp

@@ -1,4 +1,5 @@
 #include <stdio.h>
+#include <assert.h>
 #include <wayland-client-core.h>
 #include <wayland-client-protocol.h>
 
@@ -100,6 +101,12 @@ WaylandWindowImpl::~WaylandWindowImpl() { m_running = false; }
 
 void WaylandWindowImpl::OnFrame(IFrameListener fn) { m_on_frame = fn; }
 
+void WaylandWindowImpl::Init() {
+	auto display = WaylandState::GetInstance()->m_display;
+	assert(display && "wayland display is not initialized");
+	wl_display_dispatch_pending(display);
+}
+
 bool WaylandWindowImpl::Dispatch() {
 	if (!m_running) return false;