8 files changed, 556 insertions, 0 deletions
diff --git a/modules/window/c++/SConscript b/modules/window/c++/SConscript
new file mode 100644
index 0000000..10d88c6
--- /dev/null
+++ b/modules/window/c++/SConscript
@@ -0,0 +1,38 @@
+#!/bin/false
+
+import os
+import os.path
+import glob
+
+
+Import('env')
+
+dir_path = Dir('.').abspath
+
+# Environment for base library
+window_env = env.Clone();
+
+window_env.sources = sorted(glob.glob(dir_path + "/*.cpp"))
+window_env.headers = sorted(glob.glob(dir_path + "/*.h"))
+
+env.sources += window_env.sources;
+env.headers += window_env.headers;
+
+## Shared lib
+objects_shared = []
+window_env.add_source_files(objects_shared, window_env.sources, shared=True);
+env.library_shared = window_env.SharedLibrary('#build/forstio-window', [objects_shared]);
+
+## Static lib
+objects_static = []
+window_env.add_source_files(objects_static, window_env.sources, shared=False);
+env.library_static = window_env.StaticLibrary('#build/forstio-window', [objects_static]);
+
+# Set Alias
+env.Alias('library_window', [env.library_shared, env.library_static]);
+
+env.targets += ['library_window'];
+
+# Install
+env.Install('$prefix/lib/', [env.library_shared, env.library_static]);
+env.Install('$prefix/include/forstio/window/', [window_env.headers]);
diff --git a/modules/window/c++/backends.h b/modules/window/c++/backends.h
new file mode 100644
index 0000000..e129037
--- /dev/null
+++ b/modules/window/c++/backends.h
@@ -0,0 +1,10 @@
+#pragma once
+
+namespace saw {
+namespace gfx {
+namespace backend {
+struct linux_xcb {};
+struct wasm {};
+}
+}
+}
diff --git a/modules/window/c++/device.h b/modules/window/c++/device.h
new file mode 100644
index 0000000..6a28cd5
--- /dev/null
+++ b/modules/window/c++/device.h
@@ -0,0 +1,18 @@
+#pragma once
+
+#include "window.h"
+
+#include <forstio/async/async.h>
+#include <forstio/common.h>
+#include <forstio/codec/data.h>
+#include <forstio/io/io.h>
+
+#include <string_view>
+#include <variant>
+
+namespace saw {
+namespace gfx {
+template<typename T>
+class device;
+}
+}
diff --git a/modules/window/c++/linux_xcb.h b/modules/window/c++/linux_xcb.h
new file mode 100644
index 0000000..65ff94d
--- /dev/null
+++ b/modules/window/c++/linux_xcb.h
@@ -0,0 +1,5 @@
+#pragma once
+
+#ifdef SAW_UNIX_XCB
+#include "xcb.h"
+#endif
diff --git a/modules/window/c++/video_mode.h b/modules/window/c++/video_mode.h
new file mode 100644
index 0000000..a8f1695
--- /dev/null
+++ b/modules/window/c++/video_mode.h
@@ -0,0 +1,11 @@
+#pragma once
+
+#include <cstddef>
+
+namespace saw {
+class video_mode {
+public:
+	size_t width = 64;
+	size_t height = 64;
+};
+} // namespace saw
diff --git a/modules/window/c++/window.h b/modules/window/c++/window.h
new file mode 100644
index 0000000..0e8d051
--- /dev/null
+++ b/modules/window/c++/window.h
@@ -0,0 +1,79 @@
+#pragma once
+
+#include "video_mode.h"
+
+#include <forstio/async/async.h>
+#include <forstio/common.h>
+#include <forstio/codec/schema.h>
+
+#include <string_view>
+#include <variant>
+
+namespace saw {
+namespace gfx {
+namespace schema {
+using namespace saw::schema;
+using WindowResize = Struct<
+	Member<UInt32, "width">,
+	Member<UInt32, "height">
+>;
+using WindowEvents = Union<
+	Member<WindowResize, "resize">
+>;
+}
+
+template<typename T>
+class window;
+}
+}
+
+#include "linux_xcb.h"
+
+/**
+namespace saw {
+class window {
+public:
+	class event {
+	public:
+		struct resize {
+			size_t width;
+			size_t height;
+		};
+
+		struct keyboard {
+			uint32_t key;
+			uint32_t scan;
+			bool pressed;
+			bool repeat;
+		};
+
+		struct mouse {
+			uint16_t button_mask;
+			bool pressed;
+			uint32_t x;
+			uint32_t y;
+		};
+
+		struct mouse_move {
+			uint32_t x;
+			uint32_t y;
+		};
+	};
+
+	using variant_event = std::variant<event::resize, event::keyboard,
+									   event::mouse, event::mouse_move>;
+
+	virtual ~window() = default;
+
+	virtual void show() = 0;
+	virtual void hide() = 0;
+
+	virtual const video_mode &get_video_mode() const = 0;
+	virtual const std::string_view title() const = 0;
+
+	virtual void resize(size_t width, size_t height) = 0;
+
+	virtual conveyor<variant_event> on_event() = 0;
+};
+} // namespace saw
+*/
diff --git a/modules/window/c++/xcb.cpp b/modules/window/c++/xcb.cpp
new file mode 100644
index 0000000..1b804ba
--- /dev/null
+++ b/modules/window/c++/xcb.cpp
@@ -0,0 +1,290 @@
+#ifndef SAW_UNIX_XCB
+#error "XCB is not supported"
+#endif
+
+#include "xcb.h"
+
+namespace saw {
+namespace gfx {
+device<backend::linux_xcb>::device(::Display* disp,  int screen, xcb_connection_t *xcb_connection, xcb_screen_t *xcb_screen, own<input_stream>&& an):
+	display_{disp}, screen_{screen}, xcb_connection_{xcb_connection}, xcb_screen_{xcb_screen}, async_notifier_{std::move(an)},
+	async_conveyor_{async_notifier_->read_ready()
+						 .then([this]() { handle_events(); })
+						 .sink()} {}
+
+device<backend::linux_xcb>::~device(){
+	if (display_) {
+		xcb_flush(xcb_connection_);
+		::XCloseDisplay(display_);
+	}
+}
+
+void device<backend::linux_xcb>::xcb_window_was_destroyed(xcb_window_t window_id){
+	windows_.erase(window_id);
+}
+
+void device<backend::linux_xcb>::handle_events(){
+	while (xcb_generic_event_t *event = xcb_poll_for_event(xcb_connection_)) {
+		pending_events_.push_back(event);
+	}
+	for (size_t i = 0; i < pending_events_.size(); ++i) {
+		xcb_generic_event_t *event = pending_events_.at(i);
+		switch (event->response_type & ~0x80) {
+		case XCB_MOTION_NOTIFY: {
+			xcb_motion_notify_event_t *motion =
+				reinterpret_cast<xcb_motion_notify_event_t *>(event);
+			auto find = windows_.find(motion->event);
+			if (find != windows_.end()) {
+				assert(find->second);
+				find->second->mouse_move_event(motion->event_x,
+											   motion->event_y);
+			}
+		} break;
+		case XCB_EXPOSE: {
+			xcb_expose_event_t *expose =
+				reinterpret_cast<xcb_expose_event_t *>(event);
+			auto find = windows_.find(expose->window);
+			if (find != windows_.end()) {
+				assert(find->second);
+				find->second->resize_event(static_cast<size_t>(expose->x),
+										  static_cast<size_t>(expose->y),
+										  static_cast<size_t>(expose->width),
+										  static_cast<size_t>(expose->height));
+			}
+		} break;
+		case XCB_BUTTON_RELEASE: {
+			xcb_button_release_event_t *button =
+				reinterpret_cast<xcb_button_release_event_t *>(event);
+			auto find = windows_.find(button->event);
+			if (find != windows_.end()) {
+				assert(find->second);
+				find->second->mouse_event(button->event_x, button->event_y,
+										 button->detail, false);
+			}
+		} break;
+		case XCB_BUTTON_PRESS: {
+			xcb_button_press_event_t *button =
+				reinterpret_cast<xcb_button_press_event_t *>(event);
+			auto find = windows_.find(button->event);
+			if (find != windows_.end()) {
+				assert(find->second);
+				find->second->mouse_event(button->event_x, button->event_y,
+										 button->detail, true);
+			}
+		} break;
+		case XCB_KEY_RELEASE: {
+			xcb_key_release_event_t *key =
+				reinterpret_cast<xcb_key_release_event_t *>(event);
+
+			bool repeat = false;
+			/*
+			 * Peek into future events
+			 */
+			for (size_t j = i + 1; j < pending_events_.size(); ++j) {
+				xcb_generic_event_t *f_ev = pending_events_.at(j);
+
+				if ((f_ev->response_type & ~0x80) == XCB_KEY_PRESS) {
+					xcb_key_press_event_t *f_key =
+						reinterpret_cast<xcb_key_press_event_t *>(f_ev);
+
+					if (key->detail == f_key->detail &&
+						key->event == f_key->event) {
+						auto iterator = pending_events_.begin() + j;
+						assert(iterator != pending_events_.end());
+						free(*iterator);
+						pending_events_.erase(iterator);
+						repeat = true;
+						break;
+					}
+				}
+			}
+
+			auto find = windows_.find(key->event);
+			if (find != windows_.end()) {
+				assert(find->second);
+				find->second->keyboard_event(key->event_x, key->event_y,
+											key->detail, repeat, repeat);
+			}
+		} break;
+		case XCB_KEY_PRESS: {
+			xcb_key_press_event_t *key =
+				reinterpret_cast<xcb_key_press_event_t *>(event);
+			auto find = windows_.find(key->event);
+			if (find != windows_.end()) {
+				assert(find->second);
+				find->second->keyboard_event(key->event_x, key->event_y,
+											key->detail, true, false);
+			}
+		} break;
+		default:
+			break;
+		}
+	}
+
+	for (xcb_generic_event_t *event : pending_events_) {
+		free(event);
+	}
+	pending_events_.clear();
+}
+
+own<window<backend::linux_xcb>> device<backend::linux_xcb>::create_xcb_window(const video_mode &vid_mode,
+											  std::string_view title_view,
+											  int visual_id) {
+	assert(xcb_screen_);
+	assert(xcb_connection_);
+
+	xcb_colormap_t xcb_colormap = xcb_generate_id(xcb_connection_);
+	xcb_window_t xcb_window = xcb_generate_id(xcb_connection_);
+
+	xcb_create_colormap(xcb_connection_, XCB_COLORMAP_ALLOC_NONE, xcb_colormap,
+						xcb_screen_->root, visual_id);
+
+	uint32_t eventmask =
+		XCB_EVENT_MASK_EXPOSURE | XCB_EVENT_MASK_KEY_PRESS |
+		XCB_EVENT_MASK_KEY_RELEASE | XCB_EVENT_MASK_BUTTON_PRESS |
+		XCB_EVENT_MASK_BUTTON_RELEASE | XCB_EVENT_MASK_POINTER_MOTION |
+		XCB_EVENT_MASK_BUTTON_MOTION;
+	uint32_t valuelist[] = {eventmask, xcb_colormap, 0};
+	uint32_t valuemask = XCB_CW_EVENT_MASK | XCB_CW_COLORMAP;
+
+	xcb_create_window(xcb_connection_, XCB_COPY_FROM_PARENT, xcb_window,
+					  xcb_screen_->root, 0, 0, vid_mode.width,
+					  vid_mode.height, 0, XCB_WINDOW_CLASS_INPUT_OUTPUT,
+					  visual_id, valuemask, valuelist);
+
+	xcb_change_property(xcb_connection_, XCB_PROP_MODE_REPLACE, xcb_window,
+						XCB_ATOM_WM_NAME, XCB_ATOM_STRING, 8, title_view.size(),
+						title_view.data());
+
+	xcb_flush(xcb_connection_);
+	auto win = heap<window<backend::linux_xcb>>(*this, xcb_window, xcb_colormap,
+										 vid_mode, title_view);
+	// Insert into map
+	windows_[xcb_window] = win.get();
+
+	return win;
+}
+
+own<window<backend::linux_xcb>> device<backend::linux_xcb>::create_window(const video_mode& vid_mode, std::string_view title_view){
+	assert(xcb_screen_);
+	return create_xcb_window(vid_mode, title_view, xcb_screen_->root_visual);
+}
+
+void device<backend::linux_xcb>::flush(){
+	assert(xcb_connection_);
+	xcb_flush(xcb_connection_);
+}
+
+error_or<own<device<backend::linux_xcb>>> create_xcb_device(io_provider& provider){
+	::Display *display = ::XOpenDisplay(nullptr);
+	if (!display) {
+		/// @todo log errors
+		return make_error<err::critical>();
+	}
+
+	int screen = ::XDefaultScreen(display);
+
+	xcb_connection_t *xcb_connection = ::XGetXCBConnection(display);
+	if (!xcb_connection) {
+		/// @todo log errors
+		::XCloseDisplay(display);
+		return make_error<err::critical>();
+	}
+
+	int fd = xcb_get_file_descriptor(xcb_connection);
+
+	own<input_stream> fd_wrapped = provider.wrap_input_fd(fd);
+	if (!fd_wrapped) {
+		::XCloseDisplay(display);
+		return make_error<err::critical>();
+	}
+
+	::XSetEventQueueOwner(display, XCBOwnsEventQueue);
+
+	xcb_screen_iterator_t screen_iter =
+		xcb_setup_roots_iterator(xcb_get_setup(xcb_connection));
+	for (int screen_i = screen; screen_iter.rem && screen_i > 0;
+		 --screen_i, xcb_screen_next(&screen_iter))
+		;
+
+	xcb_screen_t *xcb_screen = screen_iter.data;
+
+	return heap<device<backend::linux_xcb>>(display, screen, xcb_connection, xcb_screen, std::move(fd_wrapped));
+}
+
+window<backend::linux_xcb>::window(device<backend::linux_xcb>& dev_, xcb_window_t xcb_win, xcb_colormap_t xcb_colormap_, const video_mode& vid_mode_, const std::string_view& title_view_):
+	device_{&dev_},
+	xcb_window_{xcb_win},
+	xcb_colormap_{xcb_colormap_},
+	video_mode_{vid_mode_},
+	window_title_{title_view_}
+{}
+
+window<backend::linux_xcb>::~window(){
+	assert(device_);
+	device_->xcb_window_was_destroyed(xcb_window_);
+	xcb_destroy_window(device_->xcb_connection_, xcb_window_);
+	device_->flush();
+}
+
+void window<backend::linux_xcb>::show(){
+	assert(device_->xcb_connection_);
+	xcb_map_window(device_->xcb_connection_, xcb_window_);
+}
+
+void window<backend::linux_xcb>::hide(){
+	assert(device_->xcb_connection_);
+	xcb_unmap_window(device_->xcb_connection_, xcb_window_);
+}
+
+const video_mode& window<backend::linux_xcb>::get_video_mode() const {
+	return video_mode_;
+}
+
+const std::string_view window<backend::linux_xcb>::get_title() const {
+		return window_title_;
+}
+
+void window<backend::linux_xcb>::resize(uint64_t w, uint64_t h){
+		const uint32_t values[2] = {
+				static_cast<uint32_t>(w),
+				static_cast<uint32_t>(h)
+		};
+
+		xcb_configure_window(device_->xcb_connection_, xcb_window_,
+						XCB_CONFIG_WINDOW_WIDTH | XCB_CONFIG_WINDOW_HEIGHT,
+						values);
+
+		video_mode_.width = w;
+		video_mode_.height = h;
+}
+
+conveyor<data<schema::WindowEvents>> window<backend::linux_xcb>::on_event() {
+	auto caf = new_conveyor_and_feeder<data<schema::WindowEvents>>();
+	event_feeder = std::move(caf.feeder);
+	return std::move(caf.conveyor);
+}
+
+void window<backend::linux_xcb>::resize_event(uint64_t x, uint64_t y, uint64_t width, uint64_t height){
+		/// @todo implement
+		assert(false);
+}
+void window<backend::linux_xcb>::mouse_event(int16_t x, int16_t y, uint16_t state, bool pressed){
+		/// @todo implement
+		assert(false);
+}
+void window<backend::linux_xcb>::mouse_move_event(int16_t x, int16_t y){
+		/// @todo implement
+		assert(false);
+}
+void window<backend::linux_xcb>::keyboard_event(int16_t x, int16_t y, uint32_t keycode, bool pressed, bool repeat){
+		/// @todo implement
+		assert(false);
+}
+
+xcb_window_t window<backend::linux_xcb>::get_xcb_window_handle() const{
+		return xcb_window_;
+}
+
+}
+}
diff --git a/modules/window/c++/xcb.h b/modules/window/c++/xcb.h
new file mode 100644
index 0000000..a2a9b0b
--- /dev/null
+++ b/modules/window/c++/xcb.h
@@ -0,0 +1,105 @@
+#pragma once
+
+#ifndef SAW_UNIX_XCB
+#error "XCB is not supported"
+#endif
+
+#include "backends.h"
+#include "device.h"
+#include "window.h"
+
+#include <map>
+
+#include <X11/Xlib-xcb.h>
+#include <X11/Xlib.h>
+
+namespace saw {
+namespace gfx {
+template<typename T>
+class window;
+
+template<typename T>
+class device;
+
+template<>
+class device<backend::linux_xcb> final {
+private:
+	::Display *display_;
+	int screen_;
+
+	xcb_connection_t *xcb_connection_;
+	xcb_screen_t *xcb_screen_;
+
+	own<input_stream> async_notifier_;
+	conveyor_sink async_conveyor_;
+
+	std::map<xcb_window_t, window<backend::linux_xcb> *> windows_;
+
+	std::vector<xcb_generic_event_t *> pending_events_;
+
+	friend class window<backend::linux_xcb>;
+public:
+	own<window<backend::linux_xcb>> create_xcb_window(const video_mode& vid_mod, std::string_view title_view, int visual_id);
+	void xcb_window_was_destroyed(xcb_window_t window_id);
+public:
+	device(::Display *display, int screen, xcb_connection_t *xcb_connection,
+			xcb_screen_t *xcb_screen, own<input_stream> && an);
+
+	~device();
+
+	void handle_events();
+
+	own<window<backend::linux_xcb>> create_window(const video_mode& vid_mod, std::string_view title_view);
+
+	void flush();
+
+	// XCB specific info for other classes
+	::Display* get_xcb_display() {
+		return display_;
+	}
+
+	int get_xcb_screen() const {
+		return screen_;
+	}
+};
+
+error_or<own<device<backend::linux_xcb>>> create_xcb_device(io_provider& provider);
+
+template<>
+class window<backend::linux_xcb> final {
+private:
+	device<backend::linux_xcb> *device_;
+
+	xcb_window_t xcb_window_;
+	xcb_colormap_t xcb_colormap_;
+
+	video_mode video_mode_;
+	std::string window_title_;
+
+	own<conveyor_feeder<data<schema::WindowEvents>>> event_feeder = nullptr;
+public:
+	window(device<backend::linux_xcb>& dev_, xcb_window_t xcb_win, xcb_colormap_t xcb_colormap_, const video_mode& vid_mode_, const std::string_view& title_view_);
+
+	~window();
+
+	void show();
+	void hide();
+
+	const video_mode& get_video_mode() const;
+
+	const std::string_view get_title() const;
+
+	void resize(uint64_t width, uint64_t height);
+
+	conveyor<data<schema::WindowEvents>> on_event();
+
+	void resize_event(uint64_t x, uint64_t y, uint64_t width, uint64_t height);
+	void mouse_event(int16_t x, int16_t y, uint16_t state, bool pressed);
+	void mouse_move_event(int16_t x, int16_t y);
+	void keyboard_event(int16_t x, int16_t y, uint32_t keycode, bool pressed, bool repeat);
+
+	// XCB specific things
+	xcb_window_t get_xcb_window_handle() const;
+};
+}
+}