Rework rendering

This fixes broken aspect ratio in Celeste when running fullscreen

xbanan/Base.cpp

@@ -12,6 +12,7 @@
 #include <X11/Xatom.h>
 
 #include <time.h>
+#include <sys/epoll.h>
 
 struct Selection
 {
@@ -158,6 +159,16 @@ static const char* s_opcode_to_name[] {
 	[X_NoOperation] = "X_NoOperation",
 };
 
+void register_display(int32_t x, int32_t y, uint32_t width, uint32_t height)
+{
+	MUST(g_displays.push_back({
+		.x = x,
+		.y = y,
+		.w = width,
+		.h = height,
+	}));
+}
+
 uint32_t Object::Window::full_event_mask() const
 {
 	uint32_t full_event_mask = 0;
@@ -199,9 +210,9 @@ BAN::ErrorOr<void> setup_client_conneciton(Client& client_info, const xConnClien
 	xConnSetupPrefix setup_prefix {
 		.success = 1,
 		.lengthReason = 0, // wtf is this
-		.majorVersion = client_prefix.majorVersion,
+		.majorVersion = 11,
-		.minorVersion = client_prefix.minorVersion,
+		.minorVersion = 0,
-		.length = 8 + 2*format_count + (8 + 0 + sz_xWindowRoot + sz_xDepth + sz_xVisualType) / 4,
+		.length = 8 + 2 * format_count + (8 + 0 + sz_xWindowRoot + sz_xDepth + sz_xVisualType) / 4,
 	};
 	TRY(encode(client_info.output_buffer, setup_prefix));
 
@@ -285,85 +296,61 @@ static BAN::ErrorOr<void> send_visibility_events_recursively(Client& client_info
 	return {};
 }
 
-static void invalidate_window_recursive(WINDOW wid, int32_t x, int32_t y, int32_t w, int32_t h)
+static void invalidate_window_recursive(Object::Window& dst_window, int32_t dst_x, int32_t dst_y, const Object::Window& src_window, int32_t src_x, int32_t src_y, int32_t w, int32_t h)
 {
-	ASSERT(wid != g_root.windowId);
+	ASSERT(src_window.mapped);
 
-	if (x + w <= 0 || y + h <= 0)
+	if (src_window.c_class == InputOutput)
-		return;
-	if (w <= 0 || h <= 0)
-		return;
-
-	auto& object = *g_objects[wid];
-	ASSERT(object.type == Object::Type::Window);
-
-	auto& window = object.object.get<Object::Window>();
-	if (!window.mapped)
-		return;
-
-	for (auto child_wid : window.children)
 	{
-		const auto& child_object = *g_objects[child_wid];
+		ASSERT(src_x >= 0);
-		ASSERT(child_object.type == Object::Type::Window);
+		ASSERT(src_y >= 0);
+		ASSERT(src_x + w <= src_window.width);
+		ASSERT(src_y + h <= src_window.height);
+		ASSERT(dst_x + w <= dst_window.width);
+		ASSERT(dst_y + h <= dst_window.height);
 
-		const auto& child_window = child_object.object.get<Object::Window>();
+		for (int32_t y = 0; y < h; y++)
-		if (!child_window.mapped)
+		{
-			continue;
+			      uint32_t* dst_u32 = &dst_window.double_buffer[(dst_y + y) * dst_window.width + dst_x];
-
+			const uint32_t* src_u32 = &src_window.       pixels[(src_y + y) * src_window.width + src_x];
-		const auto child_x = x - child_window.x;
+			for (int32_t x = 0; x < w; x++)
-		const auto child_y = y - child_window.y;
+			{
-
+				if (src_u32[x] != COLOR_INVISIBLE)
-		const auto child_w = BAN::Math::min<int32_t>(w - child_window.x, child_window.width  - child_x);
+					dst_u32[x] = 0xFF000000 | src_u32[x];
-		const auto child_h = BAN::Math::min<int32_t>(h - child_window.y, child_window.height - child_y);
+				else if (&dst_window == &src_window)
-
+					dst_u32[x] = 0x00000000;
-		invalidate_window_recursive(
+			}
-			child_wid,
+		}
-			child_x, child_y,
-			child_w, child_h
-		);
 	}
 
-	if (window.platform_window || window.c_class == InputOnly)
+	for (auto child_wid : src_window.children)
-		return;
-
-	auto& parent_object = *g_objects[window.parent];
-	ASSERT(parent_object.type == Object::Type::Window);
-
-	auto& parent_window = parent_object.object.get<Object::Window>();
-
-	const uint32_t* child_pix = window.pixels.data();
-	const int32_t child_w = window.width;
-	const int32_t child_h = window.height;
-
-	uint32_t* parent_pix = parent_window.pixels.data();
-	const int32_t parent_w = parent_window.width;
-	const int32_t parent_h = parent_window.height;
-
-	// FIXME: optimize this
-	for (int32_t y_off = 0; y_off < h; y_off++)
 	{
-		const int32_t child_y = y + y_off;
+		const auto& child = g_objects[child_wid]->object.get<Object::Window>();
-		if (child_y < 0 || child_y >= child_h)
+		if (!child.mapped)
 			continue;
 
-		const int32_t parent_y = window.y + y + y_off;
+		const auto diff_x = src_x - child.x;
-		if (parent_y < 0 || parent_y >= parent_h)
+		const auto diff_y = src_y - child.y;
+
+		const auto min_x = BAN::Math::max<int32_t>(diff_x, 0);
+		const auto min_y = BAN::Math::max<int32_t>(diff_y, 0);
+
+		const auto max_x = BAN::Math::min<int32_t>(diff_x + w, child.width);
+		const auto max_y = BAN::Math::min<int32_t>(diff_y + h, child.height);
+
+		if (max_x <= min_x || max_y <= min_y)
 			continue;
 
-		for (int32_t x_off = 0; x_off < w; x_off++)
+		invalidate_window_recursive(
-		{
+			dst_window,
-			const int32_t child_x = x + x_off;
+			dst_x - (diff_x - min_x),
-			if (child_x < 0 || child_x >= child_w)
+			dst_y - (diff_y - min_y),
-				continue;
+			child,
-
+			min_x,
-			const int32_t parent_x = window.x + x + x_off;
+			min_y,
-			if (parent_x < 0 || parent_x >= parent_w)
+			max_x - min_x,
-				continue;
+			max_y - min_y
-
+		);
-			const uint32_t color = child_pix[child_y * child_w + child_x];
-			if (color != COLOR_INVISIBLE)
-				parent_pix[parent_y * parent_w + parent_x] = color;
-		}
 	}
 }
 
@@ -371,68 +358,120 @@ void invalidate_window(WINDOW wid, int32_t x, int32_t y, int32_t w, int32_t h)
 {
 	ASSERT(wid != g_root.windowId);
 
+	int32_t min_x { x }, max_x { x + w };
+	int32_t min_y { y }, max_y { y + h };
+
 	for (;;)
 	{
 		if (wid == g_root.windowId)
 			return;
 
-		auto& object = *g_objects[wid];
+		const auto& window = g_objects[wid]->object.get<Object::Window>();
-		ASSERT(object.type == Object::Type::Window);
-
-		auto& window = object.object.get<Object::Window>();
 		if (!window.mapped)
 			return;
+
+		if (min_x < 0)
+			min_x = 0;
+		if (min_y < 0)
+			min_y = 0;
+
+		if (max_x > window.width)
+			max_x = window.width;
+		if (max_y > window.height)
+			max_y = window.height;
+
+		if (max_x <= min_x || max_y <= min_y)
+			return;
+
 		if (window.platform_window)
 			break;
 
-		x += window.x;
+		min_x += window.x;
-		y += window.y;
+		min_y += window.y;
 		wid = window.parent;
 	}
 
-	auto& object = *g_objects[wid];
+	auto& window = g_objects[wid]->object.get<Object::Window>();
-	ASSERT(object.type == Object::Type::Window);
 
-	auto& window = object.object.get<Object::Window>();
+	invalidate_window_recursive(
-	ASSERT(window.platform_window);
+		window, min_x, min_y,
+		window, min_x, min_y,
+		max_x - min_x,
+		max_y - min_y
+	);
 
-	invalidate_window_recursive(wid, x, y, w, h);
+	if (!window.platform_window_invalidated && g_platform_ops.begin_frame)
+		g_platform_ops.begin_frame(window.platform_window.ptr());
+	window.platform_window_invalidated = true;
 
-	const auto min_x = BAN::Math::max<int32_t>(x, 0);
+	g_platform_ops.invalidate(
-	const auto min_y = BAN::Math::max<int32_t>(y, 0);
+		window.platform_window.ptr(),
-	const auto max_x = BAN::Math::min<int32_t>(x + w, window.width);
+		&window.double_buffer[min_y * window.width + min_x],
-	const auto max_y = BAN::Math::min<int32_t>(y + h, window.height);
+		window.width * sizeof(uint32_t),
-
+		min_x, min_y,
-	if (min_x >= max_x || min_y >= max_y)
+		max_x - min_x,
-		return;
+		max_y - min_y
-
+	);
-	uint32_t* pixels = window.pixels.data();
-	for (auto y = min_y; y < max_y; y++)
-	{
-		for (auto x = min_x; x < max_x; x++)
-		{
-			auto& pixel = pixels[y * window.width + x];
-			if (pixel == COLOR_INVISIBLE)
-				pixel = 0x00000000;
-			else
-				pixel |= 0xFF000000;
-		}
-	}
-
-	g_platform_ops.invalidate(window.platform_window.ptr(), window.pixels.data(), min_x, min_y, max_x - min_x, max_y - min_y);
 }
 
-void send_exposure_recursive(WINDOW wid)
+BAN::ErrorOr<void> send_configure_notify(WINDOW wid)
 {
-	auto& object = *g_objects[wid];
+	auto& window = g_objects[wid]->object.get<Object::Window>();
-	ASSERT(object.type == Object::Type::Window);
 
-	auto& window = object.object.get<Object::Window>();
+	{
+		xEvent event = { .u = {
+			.configureNotify = {
+				.event = wid,
+				.window = wid,
+				.aboveSibling = xFalse,
+				.x = static_cast<INT16>(window.x),
+				.y = static_cast<INT16>(window.y),
+				.width = static_cast<CARD16>(window.width),
+				.height = static_cast<CARD16>(window.height),
+				.borderWidth = 0,
+				.override = xFalse,
+			}
+		}};
+		event.u.u.type = ConfigureNotify;
+		TRY(window.send_event(event, StructureNotifyMask));
+	}
+
+	auto& parent_object = *g_objects[window.parent];
+	ASSERT(parent_object.type == Object::Type::Window);
+	auto& parent_window = parent_object.object.get<Object::Window>();
+
+	{
+		xEvent event = { .u = {
+			.configureNotify = {
+				.event = window.parent,
+				.window = wid,
+				.aboveSibling = xFalse,
+				.x = static_cast<INT16>(window.x),
+				.y = static_cast<INT16>(window.y),
+				.width = static_cast<CARD16>(window.width),
+				.height = static_cast<CARD16>(window.height),
+				.borderWidth = 0,
+				.override = xFalse,
+			}
+		}};
+		event.u.u.type = ConfigureNotify;
+		TRY(parent_window.send_event(event, SubstructureNotifyMask));
+	}
+
+	return {};
+}
+
+BAN::ErrorOr<void> send_exposure_events_recursive(WINDOW wid)
+{
+	auto& window = g_objects[wid]->object.get<Object::Window>();
 	if (!window.mapped)
-		return;
+		return {};
 
 	for (auto child_wid : window.children)
-		send_exposure_recursive(child_wid);
+		TRY(send_exposure_events_recursive(child_wid));
+
+	if (window.c_class == InputOnly)
+		return {};
 
 	xEvent event = { .u = {
 		.expose = {
@@ -444,66 +483,32 @@ void send_exposure_recursive(WINDOW wid)
 		}
 	}};
 	event.u.u.type = Expose;
-	MUST(window.send_event(event, ExposureMask));
+	TRY(window.send_event(event, ExposureMask));
+
+	return {};
 }
 
-struct PlatformWindowInfo
+static WindowType get_plaform_window_info(const Object::Window& window)
-{
-	PlatformWindow* parent;
-	WindowType type;
-};
-
-static PlatformWindowInfo get_plaform_window_info(const Object::Window& window)
 {
 	static const CARD32 ATOM                              = g_atoms_name_to_id["ATOM"_sv];
-	static const CARD32 WINDOW                            = g_atoms_name_to_id["WINDOW"_sv];
-	static const CARD32 WM_TRANSIENT_FOR                  = g_atoms_name_to_id["WM_TRANSIENT_FOR"_sv];
 	static const CARD32 _NET_WM_WINDOW_TYPE               = g_atoms_name_to_id["_NET_WM_WINDOW_TYPE"_sv];
 	static const CARD32 _NET_WM_WINDOW_TYPE_DIALOG        = g_atoms_name_to_id["_NET_WM_WINDOW_TYPE_DIALOG"_sv];
 	static const CARD32 _NET_WM_WINDOW_TYPE_NORMAL        = g_atoms_name_to_id["_NET_WM_WINDOW_TYPE_NORMAL"_sv];
 	static const CARD32 _NET_WM_WINDOW_TYPE_SPLASH        = g_atoms_name_to_id["_NET_WM_WINDOW_TYPE_SPLASH"_sv];
-	static const CARD32 _NET_WM_WINDOW_TYPE_UTILITY       = g_atoms_name_to_id["_NET_WM_WINDOW_TYPE_UTILITY"_sv];
 
-	PlatformWindowInfo info {
+	auto it = window.properties.find(_NET_WM_WINDOW_TYPE);
-		.parent = nullptr,
+	if (it == window.properties.end())
-		.type = WindowType::Normal,
+		return WindowType::Normal;
-	};
 
-	if (auto it = window.properties.find(_NET_WM_WINDOW_TYPE); it != window.properties.end())
+	if (it->value.type != ATOM || it->value.data.size() != sizeof(CARD32))
-	{
+		return WindowType::Normal;
-		if (it->value.type != ATOM || it->value.data.size() != sizeof(CARD32))
-			goto wm_window_type_done;
 
-		const CARD32 type = *reinterpret_cast<const CARD32*>(it->value.data.data());
+	const CARD32 type = *reinterpret_cast<const CARD32*>(it->value.data.data());
-		if (type == _NET_WM_WINDOW_TYPE_NORMAL)
+	if (type == _NET_WM_WINDOW_TYPE_NORMAL)
-			info.type = WindowType::Normal;
+		return WindowType::Normal;
-		else if (type == _NET_WM_WINDOW_TYPE_SPLASH || type == _NET_WM_WINDOW_TYPE_DIALOG)
+	if (type == _NET_WM_WINDOW_TYPE_SPLASH || type == _NET_WM_WINDOW_TYPE_DIALOG)
-			info.type = WindowType::Utility;
+		return WindowType::Utility;
-		else
+	return WindowType::Popup;
-			info.type = WindowType::Popup;
-	}
-wm_window_type_done:
-
-	if (auto it = window.properties.find(WM_TRANSIENT_FOR); it != window.properties.end())
-	{
-		if (it->value.type != WINDOW || it->value.data.size() != sizeof(CARD32))
-			goto transitient_for_done;
-
-		const CARD32 wid = *reinterpret_cast<const CARD32*>(it->value.data.data());
-
-		auto it2 = g_objects.find(wid);
-		if (it2 == g_objects.end())
-			goto transitient_for_done;
-		if (it2->value->type != Object::Type::Window)
-			goto transitient_for_done;
-
-		// FIXME: support child windows
-		auto& window = it2->value->object.get<Object::Window>();
-		info.parent = window.platform_window.ptr();
-	}
-transitient_for_done:
-
-	return info;
 }
 
 static BAN::ErrorOr<void> map_window(Client& client_info, WINDOW wid)
@@ -526,10 +531,13 @@ static BAN::ErrorOr<void> map_window(Client& client_info, WINDOW wid)
 		if (window.width <= 10 || window.height <= 10)
 			return {};
 
-		auto info = get_plaform_window_info(window);
+		TRY(window.double_buffer.resize(window.width * window.height));
+		for (auto& pixel : window.double_buffer)
+			pixel = window.background;
+
+		const auto type = get_plaform_window_info(window);
 		window.platform_window = TRY(g_platform_ops.create_window(
-			info.parent,
+			type,
-			info.type,
 			wid,
 			window.x,
 			window.y,
@@ -573,19 +581,7 @@ static BAN::ErrorOr<void> map_window(Client& client_info, WINDOW wid)
 	if (is_visible(window.parent))
 		TRY(send_visibility_events_recursively(client_info, wid, true));
 
-	{
+	TRY(send_exposure_events_recursive(wid));
-		xEvent event = { .u = {
-			.expose = {
-				.window = wid,
-				.x = 0,
-				.y = 0,
-				.width = static_cast<CARD16>(window.width),
-				.height = static_cast<CARD16>(window.height),
-			}
-		}};
-		event.u.u.type = Expose;
-		TRY(window.send_event(event, ExposureMask));
-	}
 
 	return {};
 }
@@ -601,8 +597,8 @@ static BAN::ErrorOr<void> unmap_window(Client& client_info, WINDOW wid)
 
 	window.mapped = false;
 
-	if (window.platform_window)
+	window.double_buffer.clear();
-		window.platform_window.clear();
+	window.platform_window.clear();
 
 	if (is_visible(window.parent))
 		TRY(send_visibility_events_recursively(client_info, wid, false));
@@ -1217,6 +1213,7 @@ BAN::ErrorOr<void> handle_packet(Client& client_info, BAN::ConstByteSpan packet)
 
 			dprintln("ConfigureWindow");
 			dprintln("  window: {}", request.window);
+			dprintln("  mask:   {4h}", request.mask);
 
 			auto& window = TRY_REF(get_window(client_info, request.window, opcode));
 
@@ -1225,7 +1222,6 @@ BAN::ErrorOr<void> handle_packet(Client& client_info, BAN::ConstByteSpan packet)
 			uint32_t new_width = window.width;
 			uint32_t new_height = window.height;
 
-			dprintln("  mask:");
 			for (size_t i = 0; i < 7; i++)
 			{
 				if (!(request.mask & (1 << i)))
@@ -1237,15 +1233,19 @@ BAN::ErrorOr<void> handle_packet(Client& client_info, BAN::ConstByteSpan packet)
 				{
 					case 0:
 						new_x = value;
+						dprintln("    x: {}", value);
 						break;
 					case 1:
 						new_y = value;
+						dprintln("    y: {}", value);
 						break;
 					case 2:
 						new_width = value;
+						dprintln("    w: {}", value);
 						break;
 					case 3:
 						new_height = value;
+						dprintln("    h: {}", value);
 						break;
 					default:
 						dprintln("    {4h}: {4h}", 1 << i, value);
@@ -1253,7 +1253,7 @@ BAN::ErrorOr<void> handle_packet(Client& client_info, BAN::ConstByteSpan packet)
 				}
 			}
 
-			bool send_configure = false;
+			bool should_send_configure_notify = false;
 
 			if (new_x != window.x || new_y != window.y)
 			{
@@ -1266,7 +1266,7 @@ BAN::ErrorOr<void> handle_packet(Client& client_info, BAN::ConstByteSpan packet)
 				{
 					window.x = new_x;
 					window.y = new_y;
-					send_configure = true;
+					should_send_configure_notify = true;
 				}
 			}
 
@@ -1285,52 +1285,17 @@ BAN::ErrorOr<void> handle_packet(Client& client_info, BAN::ConstByteSpan packet)
 
 					window.width  = new_width;
 					window.height = new_height;
-					send_configure = true;
+					should_send_configure_notify = true;
 				}
 			}
 
-			if (!send_configure)
+			if (!should_send_configure_notify)
 				break;
 
-			{
+			TRY(send_configure_notify(request.window));
-				xEvent event = { .u = {
-					.configureNotify = {
-						.event = request.window,
-						.window = request.window,
-						.aboveSibling = xFalse,
-						.x = static_cast<INT16>(window.x),
-						.y = static_cast<INT16>(window.y),
-						.width = static_cast<CARD16>(window.width),
-						.height = static_cast<CARD16>(window.height),
-						.borderWidth = 0,
-						.override = xFalse,
-					}
-				}};
-				event.u.u.type = ConfigureNotify;
-				TRY(window.send_event(event, StructureNotifyMask));
-			}
 
-			auto& parent_object = *g_objects[window.parent];
+			if (is_visible(request.window))
-			ASSERT(parent_object.type == Object::Type::Window);
+				TRY(send_exposure_events_recursive(request.window));
-			auto& parent_window = parent_object.object.get<Object::Window>();
-
-			{
-				xEvent event = { .u = {
-					.configureNotify = {
-						.event = window.parent,
-						.window = request.window,
-						.aboveSibling = xFalse,
-						.x = static_cast<INT16>(window.x),
-						.y = static_cast<INT16>(window.y),
-						.width = static_cast<CARD16>(window.width),
-						.height = static_cast<CARD16>(window.height),
-						.borderWidth = 0,
-						.override = xFalse,
-					}
-				}};
-				event.u.u.type = ConfigureNotify;
-				TRY(parent_window.send_event(event, SubstructureNotifyMask));
-			}
 
 			break;
 		}
@@ -1362,15 +1327,7 @@ BAN::ErrorOr<void> handle_packet(Client& client_info, BAN::ConstByteSpan packet)
 			CARD16 width, height;
 			CARD8 depth;
 
-			if (drawable_id == g_root.windowId)
+			if (drawable.type == Object::Type::Window)
-			{
-				width = g_root.pixWidth;
-				height = g_root.pixHeight;
-				depth = g_root.rootDepth;
-				x = 0;
-				y = 0;
-			}
-			else if (drawable.type == Object::Type::Window)
 			{
 				const auto& window = drawable.object.get<Object::Window>();
 				width = window.width;
@@ -1813,9 +1770,9 @@ BAN::ErrorOr<void> handle_packet(Client& client_info, BAN::ConstByteSpan packet)
 			(void)TRY_REF(get_window(client_info, wid, X_SendEvent));
 
 			Client* target_client = nullptr;
-			for (auto& [_, thingy] : g_pollables)
+			for (auto& [_, thingy] : g_epoll_thingies)
 			{
-				if (thingy.type != Pollable::Type::Client)
+				if (thingy.type != EpollThingy::Type::Client)
 					continue;
 				auto& other_client = thingy.value.get<Client>();
 				if (!other_client.objects.contains(wid))
@@ -1937,11 +1894,47 @@ BAN::ErrorOr<void> handle_packet(Client& client_info, BAN::ConstByteSpan packet)
 		case X_GrabServer:
 		{
 			g_server_grabber_fd = client_info.fd;
+
+			for (const auto& [_, thingy] : g_epoll_thingies)
+			{
+				if (thingy.type != EpollThingy::Type::Client)
+					continue;
+
+				auto& other_client = thingy.value.get<Client>();
+				if (client_info.fd == other_client.fd)
+					continue;
+
+				uint32_t events = 0;
+				if (other_client.has_epollout)
+					events |= EPOLLOUT;
+
+				epoll_event event { .events = events, .data = { .fd = other_client.fd } };
+				epoll_ctl(g_epoll_fd, EPOLL_CTL_MOD, other_client.fd, &event);
+			}
+
 			break;
 		}
 		case X_UngrabServer:
 		{
 			g_server_grabber_fd = -1;
+
+			for (const auto& [_, thingy] : g_epoll_thingies)
+			{
+				if (thingy.type != EpollThingy::Type::Client)
+					continue;
+
+				auto& other_client = thingy.value.get<Client>();
+				if (client_info.fd == other_client.fd)
+					continue;
+
+				uint32_t events = EPOLLIN;
+				if (other_client.has_epollout)
+					events |= EPOLLOUT;
+
+				epoll_event event { .events = events, .data = { .fd = other_client.fd } };
+				epoll_ctl(g_epoll_fd, EPOLL_CTL_MOD, other_client.fd, &event);
+			}
+
 			break;
 		}
 		case X_QueryPointer:
@@ -2155,7 +2148,7 @@ BAN::ErrorOr<void> handle_packet(Client& client_info, BAN::ConstByteSpan packet)
 			// TODO: support invisible background
 
 			uint32_t foreground = 0x000000;
-			uint32_t background = 0x000000;
+			uint32_t background = 0xFFFFFF;
 			uint16_t line_width = 0;
 			uint32_t font = None;
 			bool graphics_exposures = true;

xbanan/Base.h

@@ -6,7 +6,9 @@ BAN::ErrorOr<void> setup_client_conneciton(Client& client_info, const xConnClien
 BAN::ErrorOr<void> handle_packet(Client& client_info, BAN::ConstByteSpan packet);
 
 void invalidate_window(WINDOW wid, int32_t x, int32_t y, int32_t w, int32_t h);
-void send_exposure_recursive(WINDOW wid);
+
+BAN::ErrorOr<void> send_configure_notify(WINDOW wid);
+BAN::ErrorOr<void> send_exposure_events_recursive(WINDOW wid);
 
 void update_cursor(WINDOW wid, int32_t x, int32_t y);
 
@@ -16,7 +18,8 @@ WINDOW find_child_window(WINDOW wid, int32_t& x, int32_t& y);
 
 xPoint get_window_position(WINDOW wid);
 
-static constexpr uint32_t COLOR_INVISIBLE = 0x69000000;
+// random number with alpha 0 :D
+static constexpr uint32_t COLOR_INVISIBLE = 0x00b205AF;
 
 extern CARD16 g_keymask;
 extern CARD16 g_butmask;

xbanan/Definitions.h

@@ -66,8 +66,11 @@ struct Object
 
 		uint32_t background { 0 };
 
+		bool platform_window_invalidated { false };
 		BAN::UniqPtr<PlatformWindow> platform_window;
 
+		BAN::Vector<uint32_t> double_buffer;
+
 		BAN::HashMap<Client*, uint32_t> event_masks;
 
 		BAN::HashMap<ATOM, Property> properties;
@@ -140,6 +143,7 @@ struct Client
 	};
 	int fd;
 	State state;
+	bool has_epollout { false };
 	bool has_bigrequests { false };
 	CARD16 sequence { 0 };
 	BAN::Optional<uint32_t> pid;
@@ -148,7 +152,7 @@ struct Client
 	BAN::HashSet<CARD32> objects;
 };
 
-struct Pollable
+struct EpollThingy
 {
 	enum class Type
 	{
@@ -160,6 +164,12 @@ struct Pollable
 	BAN::Variant<Client, void*> value;
 };
 
+struct DisplayInfo
+{
+	int32_t x, y;
+	uint32_t w, h;
+};
+
 extern const xPixmapFormat g_formats[6];
 extern const xDepth g_depth;
 extern const xVisualType g_visual;
@@ -171,6 +181,11 @@ extern BAN::HashMap<BAN::String, ATOM> g_atoms_name_to_id;
 extern BAN::HashMap<ATOM, BAN::String> g_atoms_id_to_name;
 extern ATOM g_atom_value;
 
-extern BAN::HashMap<int, Pollable> g_pollables;
+extern int g_epoll_fd;
+extern BAN::HashMap<int, EpollThingy> g_epoll_thingies;
 
 extern int g_server_grabber_fd;
+
+extern BAN::Vector<DisplayInfo> g_displays;
+
+extern CARD32 g_next_global_id;

xbanan/Drawing.cpp

@@ -107,7 +107,7 @@ BAN::ErrorOr<void> poly_line(Client& client_info, BAN::ConstByteSpan packet)
 	auto request = decode<xPolyLineReq>(packet).value();
 
 	dprintln("PolyLine");
-	dprintln("  drawable:  {}", request.drawable);
+	dprintln("  drawable:  {h}", request.drawable);
 	dprintln("  gc:        {}", request.gc);
 	dprintln("  coordMode: {}", request.coordMode);
 
@@ -161,7 +161,7 @@ BAN::ErrorOr<void> poly_segment(Client& client_info, BAN::ConstByteSpan packet)
 	auto request = decode<xPolySegmentReq>(packet).value();
 
 	dprintln("PolySegment");
-	dprintln("  drawable: {}", request.drawable);
+	dprintln("  drawable: {h}", request.drawable);
 	dprintln("  gc:       {}", request.gc);
 
 	auto [out_data_u32, out_w, out_h, _] = TRY(get_drawable_info(client_info, request.drawable, X_PolySegment));
@@ -203,7 +203,7 @@ BAN::ErrorOr<void> fill_poly(Client& client_info, BAN::ConstByteSpan packet)
 	auto request = decode<xFillPolyReq>(packet).value();
 
 	dprintln("FillPoly");
-	dprintln("  drawable:  {}", request.drawable);
+	dprintln("  drawable:  {h}", request.drawable);
 	dprintln("  gc:        {}", request.gc);
 	dprintln("  shape:     {}", request.shape);
 	dprintln("  coordMode: {}", request.coordMode);
@@ -278,7 +278,7 @@ BAN::ErrorOr<void> poly_fill_rectangle(Client& client_info, BAN::ConstByteSpan p
 	auto request = decode<xPolyFillRectangleReq>(packet).value();
 
 	dprintln("PolyFillRectangle");
-	dprintln("  drawable: {}", request.drawable);
+	dprintln("  drawable: {h}", request.drawable);
 	dprintln("  gc:       {}", request.gc);
 
 	auto [out_data_u32, out_w, out_h, _] = TRY(get_drawable_info(client_info, request.drawable, X_PolyFillRectangle));
@@ -320,7 +320,7 @@ BAN::ErrorOr<void> poly_fill_arc(Client& client_info, BAN::ConstByteSpan packet)
 	auto request = decode<xPolyFillArcReq>(packet).value();
 
 	dprintln("PolyFillArc");
-	dprintln("  drawable: {}", request.drawable);
+	dprintln("  drawable: {h}", request.drawable);
 	dprintln("  gc:       {}", request.gc);
 
 	auto [out_data_32, out_w, out_h, _] = TRY(get_drawable_info(client_info, request.drawable, X_PolyFillArc));

xbanan/Events.cpp

@@ -7,18 +7,23 @@
 #include <X11/Xatom.h>
 
 #include <time.h>
+#include <sys/epoll.h>
 
 void register_event_fd(int fd, void* data)
 {
-	MUST(g_pollables.insert(fd, {
+	epoll_event event { .events = EPOLLIN, .data = { .fd = fd } };
-		.type = Pollable::Type::Event,
+	epoll_ctl(g_epoll_fd, EPOLL_CTL_ADD, fd, &event);
+
+	MUST(g_epoll_thingies.insert(fd, {
+		.type = EpollThingy::Type::Event,
 		.value = data,
 	}));
 }
 
 void unregister_event_fd(int fd)
 {
-	g_pollables.remove(fd);
+	epoll_ctl(g_epoll_fd, EPOLL_CTL_DEL, fd, nullptr);
+	g_epoll_thingies.remove(fd);
 }
 
 void on_window_close_event(WINDOW wid)
@@ -70,69 +75,26 @@ void on_window_close_event(WINDOW wid)
 	}
 }
 
-static void send_window_configure(WINDOW wid, Object::Window& window)
-{
-	{
-		xEvent event = { .u = {
-			.configureNotify = {
-				.event = wid,
-				.window = wid,
-				.aboveSibling = xFalse,
-				.x = static_cast<INT16>(window.x),
-				.y = static_cast<INT16>(window.y),
-				.width = static_cast<CARD16>(window.width),
-				.height = static_cast<CARD16>(window.height),
-				.borderWidth = 0,
-				.override = xFalse,
-			}
-		}};
-		event.u.u.type = ConfigureNotify;
-		MUST(window.send_event(event, StructureNotifyMask));
-	}
-
-	auto& parent_object = *g_objects[window.parent];
-	ASSERT(parent_object.type == Object::Type::Window);
-	auto& parent_window = parent_object.object.get<Object::Window>();
-
-	{
-		xEvent event = { .u = {
-			.configureNotify = {
-				.event = window.parent,
-				.window = wid,
-				.aboveSibling = xFalse,
-				.x = static_cast<INT16>(window.x),
-				.y = static_cast<INT16>(window.y),
-				.width = static_cast<CARD16>(window.width),
-				.height = static_cast<CARD16>(window.height),
-				.borderWidth = 0,
-				.override = xFalse,
-			}
-		}};
-		event.u.u.type = ConfigureNotify;
-		MUST(parent_window.send_event(event, SubstructureNotifyMask));
-	}
-}
-
 void on_window_resize_event(WINDOW wid, uint32_t new_width, uint32_t new_height)
 {
 	auto& object = *g_objects[wid];
 	ASSERT(object.type == Object::Type::Window);
 	auto& window = object.object.get<Object::Window>();
 
-	{
+	window.width  = new_width;
-		window.width  = new_width;
+	window.height = new_height;
-		window.height = new_height;
 
-		MUST(window.pixels.resize(new_width * new_height));
+	MUST(window.pixels.resize(new_width * new_height));
-		for (auto& pixel : window.pixels)
+	for (auto& pixel : window.pixels)
-			pixel = window.background;
+		pixel = window.background;
-	}
 
-	send_window_configure(wid, window);
+	MUST(window.double_buffer.resize(new_width * new_height));
+	for (auto& pixel : window.double_buffer)
+		pixel = window.background;
 
-	send_exposure_recursive(wid);
+	MUST(send_configure_notify(wid));
 
-	invalidate_window(wid, 0, 0, window.width, window.height);
+	MUST(send_exposure_events_recursive(wid));
 }
 
 void on_window_move_event(WINDOW wid, int32_t x, int32_t y)
@@ -144,7 +106,7 @@ void on_window_move_event(WINDOW wid, int32_t x, int32_t y)
 	window.x = x;
 	window.y = y;
 
-	send_window_configure(wid, window);
+	MUST(send_configure_notify(wid));
 }
 
 void on_window_focus_event(WINDOW wid, bool focused)

xbanan/ExtRANDR.cpp

@@ -6,12 +6,64 @@
 
 #include <time.h>
 
+struct RANDRDisplay
+{
+	CARD32 crtc_id;
+	CARD32 output_id;
+	CARD32 mode_id;
+	ATOM name_atom;
+	BAN::String output_str;
+	BAN::String mode_str;
+	const DisplayInfo& info;
+};
+
+static BAN::Vector<RANDRDisplay> s_randr_displays;
+static CARD32 s_timestamp { 0 };
+
+static void initialize_displays()
+{
+	for (size_t i = 0; i < g_displays.size(); i++)
+	{
+		auto name = MUST(BAN::String::formatted("B-OUT-{}", i));
+
+		const auto name_atom = g_atom_value++;
+		MUST(g_atoms_name_to_id.insert(name, name_atom));
+		MUST(g_atoms_id_to_name.insert(name_atom, name));
+
+		MUST(s_randr_displays.push_back({
+			.crtc_id    = g_next_global_id++,
+			.output_id  = g_next_global_id++,
+			.mode_id    = g_next_global_id++,
+			.name_atom  = name_atom,
+			.output_str = BAN::move(name),
+			.mode_str   = MUST(BAN::String::formatted("{}x{}", g_displays[i].w, g_displays[i].h)),
+			.info       = g_displays[i],
+		}));
+	}
+
+	s_timestamp = time(nullptr);
+}
+
+static const RANDRDisplay& find_display_by_output(CARD32 output)
+{
+	for (const auto& display : s_randr_displays)
+		if (display.output_id == output)
+			return display;
+	ASSERT_NOT_REACHED();
+}
+
+static const RANDRDisplay& find_display_by_crtc(CARD32 crtc)
+{
+	for (const auto& display : s_randr_displays)
+		if (display.crtc_id == crtc)
+			return display;
+	ASSERT_NOT_REACHED();
+}
+
 static BAN::ErrorOr<void> extension_randr(Client& client_info, BAN::ConstByteSpan packet)
 {
-	static CARD32 crtc_id   = 5;
+	if (s_randr_displays.empty())
-	static CARD32 output_id = 6;
+		initialize_displays();
-	static CARD32 mode_id   = 7;
-	static CARD32 timestamp = time(nullptr);
 
 	static xRenderTransform transform {
 		1 << 16, 0,       0,
@@ -61,14 +113,14 @@ static BAN::ErrorOr<void> extension_randr(Client& client_info, BAN::ConstByteSpa
 				.setOfRotations = RR_Rotate_0,
 				.sequenceNumber = client_info.sequence,
 				.length = 3,
-    			.root = g_root.windowId,
+				.root = g_root.windowId,
-    			.timestamp = timestamp,
+				.timestamp = s_timestamp,
-    			.configTimestamp = timestamp,
+				.configTimestamp = s_timestamp,
-    			.nSizes = 1,
+				.nSizes = 1,
-    			.sizeID = 0,
+				.sizeID = 0,
-    			.rotation = RR_Rotate_0,
+				.rotation = RR_Rotate_0,
-    			.rate = 60,
+				.rate = 60,
-    			.nrateEnts = 1,
+				.nrateEnts = 1,
 			};
 			TRY(encode(client_info.output_buffer, reply));
 
@@ -115,55 +167,63 @@ static BAN::ErrorOr<void> extension_randr(Client& client_info, BAN::ConstByteSpa
 			dprintln("RRGetScreenResources{}", current ? "Current" : "");
 			dprintln("  window: {}", request.window);
 
-			const auto mode_name = TRY(BAN::String::formatted("{}x{}", g_root.pixWidth, g_root.pixHeight));
+			size_t mode_name_bytes = 0;
+			for (const auto& display : s_randr_displays)
+				mode_name_bytes += display.mode_str.size();
 
 			xRRGetScreenResourcesReply reply {
 				.type = X_Reply,
 				.sequenceNumber = client_info.sequence,
-				.length = static_cast<CARD32>(1 + 1 + 8 + (mode_name.size() + 3) / 4),
+				.length = static_cast<CARD32>(s_randr_displays.size() * (1 + 1 + 8) + (mode_name_bytes + 3) / 4),
-				.timestamp = timestamp,
+				.timestamp = s_timestamp,
-				.configTimestamp = timestamp,
+				.configTimestamp = s_timestamp,
-				.nCrtcs = 1,
+				.nCrtcs = static_cast<CARD16>(s_randr_displays.size()),
-				.nOutputs = 1,
+				.nOutputs = static_cast<CARD16>(s_randr_displays.size()),
-				.nModes = 1,
+				.nModes = static_cast<CARD16>(s_randr_displays.size()),
-				.nbytesNames = static_cast<CARD16>(mode_name.size()),
+				.nbytesNames = static_cast<CARD16>(mode_name_bytes),
 			};
 			TRY(encode(client_info.output_buffer, reply));
 
-			TRY(encode(client_info.output_buffer, crtc_id));
+			for (const auto& display : s_randr_displays)
+				TRY(encode(client_info.output_buffer, display.crtc_id));
 
-			TRY(encode(client_info.output_buffer, output_id));
+			for (const auto& display : s_randr_displays)
+				TRY(encode(client_info.output_buffer, display.output_id));
 
-			const CARD16 hsync_start = g_root.pixWidth;
+			for (const auto& display : s_randr_displays)
-			const CARD16 hsync_end   = g_root.pixWidth + 1;
+			{
-			const CARD16 htotal = g_root.pixWidth + 1;
+				const CARD16 hsync_start = display.info.w;
+				const CARD16 hsync_end   = display.info.w + 1;
+				const CARD16 htotal = display.info.w + 1;
 
-			const CARD16 vsync_start = g_root.pixHeight;
+				const CARD16 vsync_start = display.info.h;
-			const CARD16 vsync_end   = g_root.pixHeight + 1;
+				const CARD16 vsync_end   = display.info.h + 1;
-			const CARD16 vtotal = g_root.pixHeight + 1;
+				const CARD16 vtotal = display.info.h + 1;
 
-			const CARD32 clock = htotal * vtotal * 60;
+				const CARD32 clock = htotal * vtotal * 60;
 
-			xRRModeInfo mode_info {
+				xRRModeInfo mode_info {
-    			.id = mode_id,
+					.id = display.mode_id,
-    			.width = g_root.pixWidth,
+					.width = static_cast<CARD16>(display.info.w),
-    			.height = g_root.pixHeight,
+					.height = static_cast<CARD16>(display.info.h),
-    			.dotClock = clock,
+					.dotClock = clock,
-    			.hSyncStart = hsync_start,
+					.hSyncStart = hsync_start,
-    			.hSyncEnd = hsync_end,
+					.hSyncEnd = hsync_end,
-    			.hTotal = htotal,
+					.hTotal = htotal,
-    			.hSkew = 0,
+					.hSkew = 0,
-    			.vSyncStart = vsync_start,
+					.vSyncStart = vsync_start,
-    			.vSyncEnd = vsync_end,
+					.vSyncEnd = vsync_end,
-    			.vTotal = vtotal,
+					.vTotal = vtotal,
-    			.nameLength = static_cast<CARD16>(mode_name.size()),
+					.nameLength = static_cast<CARD16>(display.mode_str.size()),
-    			.modeFlags = RR_HSyncPositive | RR_VSyncPositive,
+					.modeFlags = RR_HSyncPositive | RR_VSyncPositive,
-			};
+				};
-			TRY(encode(client_info.output_buffer, mode_info));
+				TRY(encode(client_info.output_buffer, mode_info));
+			}
 
-			TRY(encode(client_info.output_buffer, mode_name));
+			for (const auto& display : s_randr_displays)
-			for (size_t i = 0; (mode_name.size() + i) % 4; i++)
+				TRY(encode(client_info.output_buffer, display.mode_str));
-				TRY(encode(client_info.output_buffer, '\0'));
+			while (client_info.output_buffer.size() % 4)
+				TRY(encode<BYTE>(client_info.output_buffer, 0));
 
 			break;
 		}
@@ -175,27 +235,31 @@ static BAN::ErrorOr<void> extension_randr(Client& client_info, BAN::ConstByteSpa
 			dprintln("  output:          {}", request.output);
 			dprintln("  configTimestamp: {}", request.configTimestamp);
 
+			const auto& display = find_display_by_output(request.output);
+
 			xRRGetOutputInfoReply reply {
-    			.type = X_Reply,
+				.type = X_Reply,
-    			.status = Success,
+				.status = Success,
-    			.sequenceNumber = client_info.sequence,
+				.sequenceNumber = client_info.sequence,
-    			.length = 1 + 1 + 1 + 2,
+				.length = static_cast<CARD32>(1 + 1 + 1 + (display.output_str.size() + 3) / 4),
-    			.timestamp = timestamp,
+				.timestamp = s_timestamp,
-    			.crtc = crtc_id,
+				.crtc = display.crtc_id,
-    			.mmWidth = g_root.mmWidth,
+				.mmWidth  = display.info.w * 254 / 960, // 96 DPI
-    			.mmHeight = g_root.mmHeight,
+				.mmHeight = display.info.h * 254 / 960, // 96 DPI
-    			.connection = RR_Connected,
+				.connection = RR_Connected,
-    			.subpixelOrder = SubPixelUnknown,
+				.subpixelOrder = SubPixelUnknown,
-    			.nCrtcs = 1,
+				.nCrtcs = 1,
-    			.nModes = 1,
+				.nModes = 1,
-    			.nPreferred = 1,
+				.nPreferred = 1,
-    			.nClones = 0,
+				.nClones = 0,
-    			.nameLength = 5,
+				.nameLength = static_cast<CARD16>(display.output_str.size()),
 			};
 			TRY(encode(client_info.output_buffer, reply));
-			TRY(encode(client_info.output_buffer, crtc_id));
+			TRY(encode(client_info.output_buffer, display.crtc_id));
-			TRY(encode(client_info.output_buffer, mode_id));
+			TRY(encode(client_info.output_buffer, display.mode_id));
-			TRY(encode(client_info.output_buffer, "B-OUT\0\0\0"_sv));
+			TRY(encode(client_info.output_buffer, display.output_str));
+			while (client_info.output_buffer.size() % 4)
+				TRY(encode<BYTE>(client_info.output_buffer, 0));
 
 			break;
 		}
@@ -250,25 +314,27 @@ static BAN::ErrorOr<void> extension_randr(Client& client_info, BAN::ConstByteSpa
 			dprintln("  crtc:            {}", request.crtc);
 			dprintln("  configTimestamp: {}", request.configTimestamp);
 
+			const auto& display = find_display_by_crtc(request.crtc);
+
 			xRRGetCrtcInfoReply reply {
 				.type = X_Reply,
 				.status = Success,
 				.sequenceNumber = client_info.sequence,
 				.length = 2,
-				.timestamp = timestamp,
+				.timestamp = s_timestamp,
-				.x = 0,
+				.x = static_cast<INT16>(display.info.x),
-				.y = 0,
+				.y = static_cast<INT16>(display.info.y),
-				.width = g_root.pixWidth,
+				.width  = static_cast<CARD16>(display.info.w),
-				.height = g_root.pixHeight,
+				.height = static_cast<CARD16>(display.info.h),
-				.mode = mode_id,
+				.mode = display.mode_id,
 				.rotation = RR_Rotate_0,
 				.rotations = RR_Rotate_0,
 				.nOutput = 1,
 				.nPossibleOutput = 1,
 			};
 			TRY(encode(client_info.output_buffer, reply));
-			TRY(encode(client_info.output_buffer, output_id));
+			TRY(encode(client_info.output_buffer, display.output_id));
-			TRY(encode(client_info.output_buffer, output_id));
+			TRY(encode(client_info.output_buffer, display.output_id));
 
 			break;
 		}
@@ -285,13 +351,13 @@ static BAN::ErrorOr<void> extension_randr(Client& client_info, BAN::ConstByteSpa
 			dprintln("  mode:            {}", request.mode);
 			dprintln("  rotation:        {}", request.rotation);
 
-			timestamp = time(nullptr);
+			s_timestamp = time(nullptr);
 			xRRSetCrtcConfigReply reply {
 				.type = X_Reply,
 				.status = Success,
 				.sequenceNumber = client_info.sequence,
 				.length = 0,
-				.newTimestamp = timestamp,
+				.newTimestamp = s_timestamp,
 			};
 			TRY(encode(client_info.output_buffer, reply));
 
@@ -301,15 +367,15 @@ static BAN::ErrorOr<void> extension_randr(Client& client_info, BAN::ConstByteSpa
 		{
 			auto request = decode<xRRGetCrtcGammaSizeReq>(packet).value();
 
-			dprintln("RRGetCrtcGammaSize");
+			dwarnln("RRGetCrtcGammaSize");
-			dprintln("  crtc:            {}", request.crtc);
+			dwarnln("  crtc:            {}", request.crtc);
 
 			xRRGetCrtcGammaSizeReply reply {
-    			.type = X_Reply,
+				.type = X_Reply,
-    			.status = Success,
+				.status = Success,
-    			.sequenceNumber = client_info.sequence,
+				.sequenceNumber = client_info.sequence,
-    			.length = 0,
+				.length = 0,
-				.size = 1,
+				.size = 256,
 			};
 			TRY(encode(client_info.output_buffer, reply));
 
@@ -323,17 +389,16 @@ static BAN::ErrorOr<void> extension_randr(Client& client_info, BAN::ConstByteSpa
 			dprintln("  crtc:            {}", request.crtc);
 
 			xRRGetCrtcGammaReply reply {
-    			.type = X_Reply,
+				.type = X_Reply,
-    			.status = Success,
+				.status = Success,
-    			.sequenceNumber = client_info.sequence,
+				.sequenceNumber = client_info.sequence,
-    			.length = 2,
+				.length = (6 * 256) / 4,
-				.size = 1,
+				.size = 256,
 			};
 			TRY(encode(client_info.output_buffer, reply));
-			TRY(encode<CARD16>(client_info.output_buffer, 1));
+			for (size_t i = 0; i < 3; i++)
-			TRY(encode<CARD16>(client_info.output_buffer, 1));
+				for (size_t j = 0; j < 256; j++)
-			TRY(encode<CARD16>(client_info.output_buffer, 1));
+					TRY(encode<CARD16>(client_info.output_buffer, j * 65535 / 255));
-			TRY(encode<CARD16>(client_info.output_buffer, 0));
 
 			break;
 		}
@@ -345,17 +410,17 @@ static BAN::ErrorOr<void> extension_randr(Client& client_info, BAN::ConstByteSpa
 			dprintln("  crtc:            {}", request.crtc);
 
 			xRRGetCrtcTransformReply reply {
-    			.type = X_Reply,
+				.type = X_Reply,
-    			.status = Success,
+				.status = Success,
-    			.sequenceNumber = client_info.sequence,
+				.sequenceNumber = client_info.sequence,
-    			.length = 16,
+				.length = 16,
-    			.pendingTransform = transform,
+				.pendingTransform = transform,
-    			.hasTransforms = xFalse,
+				.hasTransforms = xFalse,
-    			.currentTransform = transform,
+				.currentTransform = transform,
-    			.pendingNbytesFilter = 0,
+				.pendingNbytesFilter = 0,
-    			.pendingNparamsFilter = 0,
+				.pendingNparamsFilter = 0,
-    			.currentNbytesFilter = 0,
+				.currentNbytesFilter = 0,
-    			.currentNparamsFilter = 0,
+				.currentNparamsFilter = 0,
 			};
 			TRY(encode(client_info.output_buffer, reply));
 
@@ -369,23 +434,23 @@ static BAN::ErrorOr<void> extension_randr(Client& client_info, BAN::ConstByteSpa
 			dprintln("  crtc: {}", request.crtc);
 
 			xRRGetPanningReply reply {
-    			.type = X_Reply,
+				.type = X_Reply,
-    			.status = Success,
+				.status = Success,
-    			.sequenceNumber = client_info.sequence,
+				.sequenceNumber = client_info.sequence,
-    			.length = 1,
+				.length = 1,
-    			.timestamp = timestamp,
+				.timestamp = s_timestamp,
-    			.left = 0,
+				.left = 0,
-    			.top = 0,
+				.top = 0,
-    			.width = 0,
+				.width = 0,
-    			.height = 0,
+				.height = 0,
-    			.track_left = 0,
+				.track_left = 0,
-    			.track_top = 0,
+				.track_top = 0,
-    			.track_width = 0,
+				.track_width = 0,
-    			.track_height = 0,
+				.track_height = 0,
-    			.border_left = 0,
+				.border_left = 0,
-    			.border_top = 0,
+				.border_top = 0,
-    			.border_right = 0,
+				.border_right = 0,
-    			.border_bottom = 0,
+				.border_bottom = 0,
 			};
 			TRY(encode(client_info.output_buffer, reply));
 
@@ -399,10 +464,10 @@ static BAN::ErrorOr<void> extension_randr(Client& client_info, BAN::ConstByteSpa
 			dprintln("  window: {}", request.window);
 
 			xRRGetOutputPrimaryReply reply {
-    			.type = X_Reply,
+				.type = X_Reply,
-    			.sequenceNumber = client_info.sequence,
+				.sequenceNumber = client_info.sequence,
-    			.length = 0,
+				.length = 0,
-				.output = output_id,
+				.output = s_randr_displays.front().output_id,
 			};
 			TRY(encode(client_info.output_buffer, reply));
 
@@ -416,10 +481,10 @@ static BAN::ErrorOr<void> extension_randr(Client& client_info, BAN::ConstByteSpa
 			dprintln("  window: {}", request.window);
 
 			xRRGetProvidersReply reply {
-    			.type = X_Reply,
+				.type = X_Reply,
-    			.sequenceNumber = client_info.sequence,
+				.sequenceNumber = client_info.sequence,
-    			.length = 0,
+				.length = 0,
-				.timestamp = timestamp,
+				.timestamp = s_timestamp,
 				.nProviders = 0,
 			};
 			TRY(encode(client_info.output_buffer, reply));
@@ -435,31 +500,33 @@ static BAN::ErrorOr<void> extension_randr(Client& client_info, BAN::ConstByteSpa
 			dprintln("  get_active: {}", request.get_active);
 
 			xRRGetMonitorsReply reply {
-    			.type = X_Reply,
+				.type = X_Reply,
 				.status = Success,
-    			.sequenceNumber = client_info.sequence,
+				.sequenceNumber = client_info.sequence,
-    			.length = 6 + 1,
+				.length = static_cast<CARD32>(6 * s_randr_displays.size() + s_randr_displays.size()),
-				.timestamp = timestamp,
+				.timestamp = s_timestamp,
-				.nmonitors = 1,
+				.nmonitors = static_cast<CARD32>(s_randr_displays.size()),
-				.noutputs = 1,
+				.noutputs = static_cast<CARD32>(s_randr_displays.size()),
 			};
 			TRY(encode(client_info.output_buffer, reply));
 
-			xRRMonitorInfo monitor {
+			for (const auto& display : s_randr_displays)
-				.name = None,
+			{
-				.primary = xTrue,
+				xRRMonitorInfo monitor {
-				.automatic = xTrue,
+					.name = display.name_atom,
-				.noutput = 1,
+					.primary = (&display == &s_randr_displays.front()),
-				.x = 0,
+					.automatic = xTrue,
-				.y = 0,
+					.noutput = 1,
-				.width = g_root.pixWidth,
+					.x = static_cast<INT16>(display.info.x),
-				.height = g_root.pixHeight,
+					.y = static_cast<INT16>(display.info.y),
-				.widthInMillimeters = g_root.mmWidth,
+					.width  = static_cast<CARD16>(display.info.w),
-				.heightInMillimeters = g_root.mmHeight,
+					.height = static_cast<CARD16>(display.info.h),
-			};
+					.widthInMillimeters  = display.info.w * 254 / 96, // 96 DPI
-			TRY(encode(client_info.output_buffer, monitor));
+					.heightInMillimeters = display.info.h * 254 / 96, // 96 DPI
-
+				};
-			TRY(encode(client_info.output_buffer, output_id));
+				TRY(encode(client_info.output_buffer, monitor));
+				TRY(encode(client_info.output_buffer, display.output_id));
+			}
 
 			break;
 		}

xbanan/ExtXRes.cpp

@@ -7,12 +7,12 @@
 template<typename F>
 static BAN::ErrorOr<void> for_each_client(uint32_t target_spec, const F& callback)
 {
-	for (auto [fd, thingy] : g_pollables)
+	for (const auto& [fd, thingy] : g_epoll_thingies)
 	{
-		if (thingy.type != Pollable::Type::Client)
+		if (thingy.type != EpollThingy::Type::Client)
 			continue;
 
-		Client& client_info = thingy.value.get<Client>();
+		const auto& client_info = thingy.value.get<Client>();
 		if (target_spec && (target_spec >> 20) != client_info.fd)
 			continue;
 
@@ -61,7 +61,7 @@ BAN::ErrorOr<void> extension_xres(Client& client_info, BAN::ConstByteSpan packet
 			{
 				auto spec = decode<xXResClientIdSpec>(packet).value();
 
-				TRY(for_each_client(spec.client, [&](Client& client_info, uint32_t client_spec) -> BAN::ErrorOr<void> {
+				TRY(for_each_client(spec.client, [&](const Client& client_info, uint32_t client_spec) -> BAN::ErrorOr<void> {
 					if (spec.mask == None || (spec.mask & X_XResClientXIDMask))
 					{
 						xXResClientIdValue value {

xbanan/Platform.h

@@ -47,13 +47,18 @@ enum class SystemCursorType
 struct PlatformOps
 {
 	/* Do platform initialization */
-	bool (*initialize)(uint32_t* width, uint32_t* height);
+	bool (*initialize)();
 	/* Handle pending events */
 	void (*poll_events)(void*);
 	/* Create a window with given size */
-	BAN::ErrorOr<BAN::UniqPtr<PlatformWindow>> (*create_window)(PlatformWindow* parent, WindowType, WINDOW wid, int32_t x, int32_t y, uint32_t width, uint32_t height);
+	BAN::ErrorOr<BAN::UniqPtr<PlatformWindow>> (*create_window)(WindowType, WINDOW wid, int32_t x, int32_t y, uint32_t width, uint32_t height);
-	/* Invaldate part of a window */
+	/* All invalidate calls during one frame happen between calls to begin_frame and end_frame. pixels is in ARGB8888
-	void (*invalidate)(PlatformWindow*, const uint32_t* pixels, uint32_t x, uint32_t y, uint32_t width, uint32_t height);
+	 *   invalidate    should update the underlying textures
+	 *   begin_frame   should do any necessary preparations to update a frame
+	 *   end_frame     should flush the updated texturee to the window */
+	void (*invalidate)(PlatformWindow*, const void* pixels, uint32_t pitch, uint32_t x, uint32_t y, uint32_t width, uint32_t height);
+	void (*begin_frame)(PlatformWindow*);
+	void (*end_frame)(PlatformWindow*);
 	/* Request resize of a window, can be async */
 	void (*request_resize)(PlatformWindow*, uint32_t width, uint32_t height);
 	/* Request window repositioning */
@@ -74,3 +79,5 @@ struct PlatformOps
 	void (*set_cursor)(PlatformWindow*, PlatformCursor*);
 };
 extern PlatformOps g_platform_ops;
+
+void register_display(int32_t x, int32_t y, uint32_t width, uint32_t height);

xbanan/SDL3/sdl3.cpp

@@ -69,7 +69,7 @@ static void* sdl3_thread(void*)
 
 static void sdl3_initialize_keymap();
 
-static bool sdl3_initialize(uint32_t* display_w, uint32_t* display_h)
+static bool sdl3_initialize()
 {
 	if (!SDL_Init(SDL_INIT_VIDEO | SDL_INIT_EVENTS))
 	{
@@ -77,15 +77,16 @@ static bool sdl3_initialize(uint32_t* display_w, uint32_t* display_h)
 		return false;
 	}
 
-	*display_w = *display_h = 0;
-
 	const SDL_DisplayID* display_ids = SDL_GetDisplays(nullptr);
 	for (int i = 0; display_ids[i]; i++)
 	{
 		SDL_Rect rect;
-		SDL_GetDisplayBounds(display_ids[i], &rect);
+		if (!SDL_GetDisplayBounds(display_ids[i], &rect))
-		*display_w = BAN::Math::max<uint32_t>(*display_w, rect.x + rect.w);
+		{
-		*display_h = BAN::Math::max<uint32_t>(*display_h, rect.y + rect.h);
+			dwarnln("Could not display {} bounds: {}", SDL_GetError());
+			continue;
+		}
+		register_display(rect.x, rect.y, rect.w, rect.h);
 	}
 
 	sdl3_initialize_keymap();
@@ -107,7 +108,7 @@ static bool sdl3_initialize(uint32_t* display_w, uint32_t* display_h)
 	return true;
 }
 
-static BAN::ErrorOr<BAN::UniqPtr<PlatformWindow>> sdl3_create_window(PlatformWindow* parent, WindowType type, WINDOW wid, int32_t x, int32_t y, uint32_t width, uint32_t height)
+static BAN::ErrorOr<BAN::UniqPtr<PlatformWindow>> sdl3_create_window(WindowType type, WINDOW wid, int32_t x, int32_t y, uint32_t width, uint32_t height)
 {
 	auto window = TRY(BAN::UniqPtr<SDLWindow>::create());
 
@@ -119,29 +120,19 @@ static BAN::ErrorOr<BAN::UniqPtr<PlatformWindow>> sdl3_create_window(PlatformWin
 	switch (type)
 	{
 		case WindowType::Normal:
-		case WindowType::Utility:
 			flags = SDL_WINDOW_RESIZABLE;
 			break;
+		case WindowType::Utility:
+			flags = SDL_WINDOW_RESIZABLE | SDL_WINDOW_UTILITY;
+			break;
 		case WindowType::Popup:
-			flags = SDL_WINDOW_BORDERLESS;
+			flags = SDL_WINDOW_BORDERLESS | SDL_WINDOW_UTILITY;
 			break;
 	}
 
-	if (parent == nullptr || type != WindowType::Popup)
+	flags |= SDL_WINDOW_TRANSPARENT;
-	{
-		if (type != WindowType::Normal)
-			flags |= SDL_WINDOW_UTILITY;
-		window->window = SDL_CreateWindow("", width, height, flags);
-	}
-	else
-	{
-		auto& sdl_parent = *static_cast<SDLWindow*>(parent);
 
-		int parent_x, parent_y;
+	window->window = SDL_CreateWindow("", width, height, flags);
-		SDL_GetWindowPosition(sdl_parent.window, &parent_x, &parent_y);
-
-		window->window = SDL_CreatePopupWindow(sdl_parent.window, x - parent_x, y - parent_y, width, height, flags | SDL_WINDOW_POPUP_MENU);
-	}
 
 	if (window->window == nullptr)
 	{
@@ -149,6 +140,9 @@ static BAN::ErrorOr<BAN::UniqPtr<PlatformWindow>> sdl3_create_window(PlatformWin
 		return BAN::Error::from_errno(EFAULT);
 	}
 
+	if (x != 0 || y != 0)
+		SDL_SetWindowPosition(window->window, x, y);
+
 	window->renderer = SDL_CreateRenderer(window->window, nullptr);
 	if (window->renderer == nullptr)
 	{
@@ -156,6 +150,8 @@ static BAN::ErrorOr<BAN::UniqPtr<PlatformWindow>> sdl3_create_window(PlatformWin
 		return BAN::Error::from_errno(EFAULT);
 	}
 
+	SDL_SetRenderDrawColor(window->renderer, 0, 0, 0, 0);
+
 	window->texture = SDL_CreateTexture(window->renderer, SDL_PIXELFORMAT_ARGB8888, SDL_TEXTUREACCESS_STREAMING, width, height);
 	if (window->texture == nullptr)
 	{
@@ -291,7 +287,7 @@ static void sdl3_poll_events(void*)
 	}
 }
 
-static void sdl3_invalidate(PlatformWindow* window, const uint32_t* src_pixels, uint32_t x, uint32_t y, uint32_t width, uint32_t height)
+static void sdl3_invalidate(PlatformWindow* window, const void* src_pixels, uint32_t src_pitch, uint32_t x, uint32_t y, uint32_t width, uint32_t height)
 {
 	auto& sdl_window = *static_cast<SDLWindow*>(window);
 
@@ -316,16 +312,20 @@ static void sdl3_invalidate(PlatformWindow* window, const uint32_t* src_pixels,
 	for (int32_t y_off = 0; y_off < rect.h; y_off++)
 	{
 		memcpy(
-			static_cast<uint8_t*>(dst_pixels) + y_off * dst_pitch,
+			static_cast<      uint8_t*>(dst_pixels) + y_off * dst_pitch,
-			&src_pixels[(rect.y + y_off) * sdl_window.width + rect.x],
+			static_cast<const uint8_t*>(src_pixels) + y_off * src_pitch,
 			rect.w * sizeof(uint32_t)
 		);
 	}
 
 	SDL_UnlockTexture(sdl_window.texture);
+}
 
+static void sdl3_end_frame(PlatformWindow* window)
+{
+	auto& sdl_window = *static_cast<SDLWindow*>(window);
 	SDL_RenderClear(sdl_window.renderer);
-	SDL_RenderTexture(sdl_window.renderer, sdl_window.texture, NULL, NULL);
+	SDL_RenderTexture(sdl_window.renderer, sdl_window.texture, nullptr, nullptr);
 	SDL_RenderPresent(sdl_window.renderer);
 }
 
@@ -438,6 +438,8 @@ PlatformOps g_platform_ops = {
 	.poll_events          = sdl3_poll_events,
 	.create_window        = sdl3_create_window,
 	.invalidate           = sdl3_invalidate,
+	.begin_frame          = nullptr,
+	.end_frame            = sdl3_end_frame,
 	.request_resize       = sdl3_request_resize,
 	.request_reposition   = sdl3_request_reposition,
 	.request_fullscreen   = sdl3_request_fullscreen,
@@ -505,9 +507,9 @@ static uint32_t sdl3_keycode_to_x_keysym(SDL_Keycode keycode)
 {
 	if (iswprint(keycode))
 	{
-		if ((keycode >= 0x20 && keycode <= 0x7E) || (keycode >= 0xA0 && keycode <= 0xFF))
+		if (keycode >= 0x100)
-			return keycode;
+			keycode |= 0x01000000;
-		return 0x01000000 | keycode;
+		return keycode;
 	}
 
 	switch (keycode)

xbanan/banan-os/banan-os.cpp

@@ -28,7 +28,7 @@ struct BananCursor final : public PlatformCursor
 
 static BAN::ErrorOr<void> bananos_initialize_keymap();
 
-static bool bananos_initialize(uint32_t* display_w, uint32_t* display_h)
+static bool bananos_initialize()
 {
 	auto attributes = LibGUI::Window::default_attributes;
 	attributes.shown = false;
@@ -40,8 +40,7 @@ static bool bananos_initialize(uint32_t* display_w, uint32_t* display_h)
 		return false;
 	}
 
-	*display_w = dummy_or_error.value()->width();
+	register_display(0, 0, dummy_or_error.value()->width(), dummy_or_error.value()->height());
-	*display_h = dummy_or_error.value()->height();
 
 	if (auto ret = bananos_initialize_keymap(); ret.is_error())
 	{
@@ -58,12 +57,9 @@ static void bananos_poll_events(void* window)
 	banan_window.window->poll_events();
 }
 
-static BAN::ErrorOr<BAN::UniqPtr<PlatformWindow>> bananos_create_window(PlatformWindow* parent, WindowType type, WINDOW wid, int32_t x, int32_t y, uint32_t width, uint32_t height)
+static BAN::ErrorOr<BAN::UniqPtr<PlatformWindow>> bananos_create_window(WindowType type, WINDOW wid, int32_t x, int32_t y, uint32_t width, uint32_t height)
 {
-	(void)parent;
 	(void)type;
-	(void)x;
-	(void)y;
 
 	auto window = TRY(BAN::UniqPtr<BananWindow>::create());
 
@@ -71,6 +67,7 @@ static BAN::ErrorOr<BAN::UniqPtr<PlatformWindow>> bananos_create_window(Platform
 	attributes.shown = true;
 	attributes.title_bar = false;
 	attributes.resizable = true;
+	attributes.alpha_channel = true;
 
 	auto gui_window = TRY(LibGUI::Window::create(width, height, ""_sv, attributes));
 	auto* winp = gui_window.ptr();
@@ -133,18 +130,28 @@ static void bananos_request_resize(PlatformWindow* window, uint32_t width, uint3
 	banan_window.window->request_resize(width, height);
 }
 
-static void bananos_invalidate(PlatformWindow* window, const uint32_t* pixels, uint32_t x, uint32_t y, uint32_t width, uint32_t height)
+static void bananos_invalidate(PlatformWindow* window, const void* src_pixels, uint32_t src_pitch, uint32_t x, uint32_t y, uint32_t width, uint32_t height)
 {
 	auto& banan_window = *static_cast<BananWindow*>(window);
 
-	const uint32_t win_width = banan_window.window->width();
+	auto& texture = banan_window.window->texture();
+	void* dst_pixels = &texture.pixels()[y * texture.width() + x];
+	const uint32_t dst_pitch = texture.width() * sizeof(uint32_t);
 
-	auto* out_pixels = banan_window.window->texture().pixels().data();
 	for (uint32_t y_off = 0; y_off < height; y_off++)
-		for (uint32_t x_off = 0; x_off < width; x_off++)
+	{
-			out_pixels[(y + y_off) * win_width + (x + x_off)] = pixels[(y + y_off) * win_width + (x + x_off)];
+		memcpy(
+			static_cast<      uint8_t*>(dst_pixels) + y_off * dst_pitch,
+			static_cast<const uint8_t*>(src_pixels) + y_off * src_pitch,
+			width * sizeof(uint32_t)
+		);
+	}
+}
 
-	banan_window.window->invalidate(x, y, width, height);
+static void bananos_end_frame(PlatformWindow* window)
+{
+	auto& banan_window = *static_cast<BananWindow*>(window);
+	banan_window.window->invalidate();
 }
 
 static void bananos_request_fullscreen(PlatformWindow* window, bool fullscreen)
@@ -187,6 +194,8 @@ PlatformOps g_platform_ops = {
 	.poll_events          = bananos_poll_events,
 	.create_window        = bananos_create_window,
 	.invalidate           = bananos_invalidate,
+	.begin_frame          = nullptr,
+	.end_frame            = bananos_end_frame,
 	.request_resize       = bananos_request_resize,
 	.request_reposition   = nullptr,
 	.request_fullscreen   = bananos_request_fullscreen,
@@ -201,29 +210,27 @@ PlatformOps g_platform_ops = {
 #include <LibInput/KeyboardLayout.h>
 #include <LibInput/KeyEvent.h>
 
-static uint32_t bananos_key_to_x_keysym(LibInput::Key, bool upper);
+static uint32_t bananos_keyevent_to_x_keysym(LibInput::KeyEvent event);
 
 static BAN::ErrorOr<void> bananos_initialize_keymap()
 {
+	static constexpr uint16_t modifier_map[] {
+		0,
+		LibInput::KeyEvent::LShift,
+		LibInput::KeyEvent::RAlt,
+		LibInput::KeyEvent::RAlt | LibInput::KeyEvent::LShift,
+	};
+
 	// FIXME: get this from somewhere (gui command? enviroment? tmp file?)
 	const auto keymap_path = "./us.keymap"_sv;
-
 	TRY(LibInput::KeyboardLayout::initialize());
-
 	auto& keyboard_layout = LibInput::KeyboardLayout::get();
 	TRY(keyboard_layout.load_from_file(keymap_path));
 
-	const BAN::Span<const LibInput::Key> banan_keymaps[] {
+	for (uint8_t scancode = 0; scancode < g_keymap_size; scancode++)
-		keyboard_layout.keymap_normal(),
-		keyboard_layout.keymap_shift(),
-		keyboard_layout.keymap_altgr(),
-		keyboard_layout.keymap_altgr(), // add shift+altgr map?
-	};
-
-	for (size_t scancode = 0; scancode < g_keymap_size; scancode++)
 		for (size_t layer = 0; layer < g_keymap_layers; layer++)
-			if (const auto banan_key = banan_keymaps[layer][scancode]; banan_key != LibInput::Key::None)
+			if (const auto event = keyboard_layout.key_event_from_raw({ .modifier = modifier_map[layer], .keycode = scancode }); event.key != LibInput::Key::None)
-				g_keymap[scancode][layer] = bananos_key_to_x_keysym(banan_key, layer % 2);
+				g_keymap[scancode][layer] = bananos_keyevent_to_x_keysym(event);
 
 	using LibInput::keycode_normal;
 	using LibInput::keycode_numpad;
@@ -258,22 +265,22 @@ static BAN::ErrorOr<void> bananos_initialize_keymap()
 
 #include <wctype.h>
 
-static uint32_t bananos_key_to_x_keysym(LibInput::Key key, bool upper)
+static uint32_t bananos_keyevent_to_x_keysym(LibInput::KeyEvent event)
 {
 	using namespace LibInput;
 
-	if (const char* utf8 = key_to_utf8(key, upper ? KeyEvent::LShift : 0))
+	if (const char* utf8 = key_to_utf8(event.key, event.modifier))
 	{
-		const uint32_t codepoint = BAN::UTF8::to_codepoint(utf8);
+		uint32_t codepoint = BAN::UTF8::to_codepoint(utf8);
 		if (codepoint != BAN::UTF8::invalid && iswprint(codepoint))
 		{
-			if ((codepoint >= 0x20 && codepoint <= 0x7E) || (codepoint >= 0xA0 && codepoint <= 0xFF))
+			if (codepoint >= 0x100)
-				return codepoint;
+				codepoint |= 0x01000000;
-			return 0x01000000 | codepoint;
+			return codepoint;
 		}
 	}
 
-	switch (key)
+	switch (event.key)
 	{
 		case Key::F1:             return XK_F1;
 		case Key::F2:             return XK_F2;

xbanan/main.cpp

@@ -5,8 +5,8 @@
 #include <X11/Xatom.h>
 
 #include <locale.h>
-#include <poll.h>
 #include <signal.h>
+#include <sys/epoll.h>
 #include <sys/socket.h>
 #include <sys/stat.h>
 #include <unistd.h>
@@ -19,6 +19,8 @@
 #include <netinet/in.h>
 #endif
 
+CARD32 g_next_global_id { 1 };
+
 const xPixmapFormat g_formats[6] {
 	{
 		.depth = 1,
@@ -58,7 +60,7 @@ const xDepth g_depth {
 };
 
 const xVisualType g_visual {
-	.visualID = 1,
+	.visualID = g_next_global_id++,
 	.c_class = TrueColor,
 	.bitsPerRGB = 8,
 	.colormapEntries = 256,
@@ -68,31 +70,34 @@ const xVisualType g_visual {
 };
 
 xWindowRoot g_root {
-	.windowId = 2,
+	.windowId = g_next_global_id++,
 	.defaultColormap = 0,
 	.whitePixel = 0xFFFFFF,
 	.blackPixel = 0x000000,
 	.currentInputMask = 0,
 	.pixWidth = 0,
 	.pixHeight = 0,
-	.mmWidth  = 0,
+	.mmWidth = 0,
 	.mmHeight = 0,
 	.minInstalledMaps = 1,
 	.maxInstalledMaps = 1,
 	.rootVisualID = g_visual.visualID,
 	.backingStore = 0,
 	.saveUnders = 0,
-	.rootDepth = 24,
+	.rootDepth = g_depth.depth,
 	.nDepths = 1,
 };
 
+BAN::Vector<DisplayInfo> g_displays;
+
 BAN::HashMap<CARD32, BAN::UniqPtr<Object>> g_objects;
 
 BAN::HashMap<BAN::String, ATOM> g_atoms_name_to_id;
 BAN::HashMap<ATOM, BAN::String> g_atoms_id_to_name;
 ATOM g_atom_value = XA_LAST_PREDEFINED + 1;
 
-BAN::HashMap<int, Pollable> g_pollables;
+int g_epoll_fd;
+BAN::HashMap<int, EpollThingy> g_epoll_thingies;
 
 int g_server_grabber_fd = -1;
 
@@ -154,6 +159,22 @@ int main()
 		return 1;
 	}
 
+	g_epoll_fd = epoll_create1(0);
+	if (g_epoll_fd == -1)
+	{
+		perror("xbanan: epoll_create1");
+		return 1;
+	}
+
+	{
+		epoll_event event { .events = EPOLLIN, .data = { .ptr = nullptr } };
+		if (epoll_ctl(g_epoll_fd, EPOLL_CTL_ADD, server_sock, &event) == -1)
+		{
+			perror("xbanan: epoll_ctl");
+			return 1;
+		}
+	}
+
 #define APPEND_ATOM(name) do { \
 			MUST(g_atoms_id_to_name.insert(name, #name##_sv.substring(3))); \
 			MUST(g_atoms_name_to_id.insert(#name##_sv.substring(3), name)); \
@@ -244,22 +265,62 @@ int main()
 	APPEND_ATOM_CUSTOM(_NET_WM_WINDOW_TYPE_UTILITY);
 #undef APPEND_ATOM_CUSTOM
 
-	uint32_t display_w, display_h;
+	if (!g_platform_ops.initialize())
-	if (!g_platform_ops.initialize(&display_w, &display_h))
 		return 1;
-	g_root.pixWidth  = display_w;
+
-	g_root.pixHeight = display_h;
+	if (g_displays.empty())
-	g_root.mmWidth   = static_cast<CARD16>(display_w * 254 / 960); // 96 DPI
+	{
-	g_root.mmHeight  = static_cast<CARD16>(display_h * 254 / 960); // 96 DPI
+		dwarnln("No displays windows initilized");
+		return 1;
+	}
+
+	int32_t display_min_x { INT32_MAX }, display_min_y { INT32_MAX };
+	int32_t display_max_x { INT32_MIN }, display_max_y { INT32_MIN };
+	for (const auto& display : g_displays)
+	{
+		display_min_x = BAN::Math::min<int32_t>(display_min_x, display.x);
+		display_min_y = BAN::Math::min<int32_t>(display_min_y, display.y);
+		display_max_x = BAN::Math::max<int32_t>(display_max_x, display.x + display.w);
+		display_max_y = BAN::Math::max<int32_t>(display_max_y, display.y + display.h);
+	}
+
+	g_root.pixWidth  = display_max_x - display_min_x;
+	g_root.pixHeight = display_max_y - display_min_y;
+
+	g_root.mmWidth  = g_root.pixWidth  * 254 / 960; // 96 DPI
+	g_root.mmHeight = g_root.pixHeight * 254 / 960; // 96 DPI
+
+	Client dummy_owner;
+	MUST(g_objects.insert(g_root.windowId, MUST(BAN::UniqPtr<Object>::create(Object {
+		.type = Object::Type::Window,
+		.object = Object::Window {
+			.owner = dummy_owner,
+			.depth = g_root.rootDepth,
+			.x = display_min_x,
+			.y = display_min_y,
+			.parent = None,
+			.cursor = None,
+			.c_class = InputOutput,
+			.width = g_root.pixWidth,
+			.height = g_root.pixHeight,
+			.background = None,
+		}
+	}))));
+
+	MUST(g_objects.insert(g_visual.visualID,
+		MUST(BAN::UniqPtr<Object>::create(Object {
+			.type = Object::Type::Visual,
+		}))
+	));
 
 	printf("xbanan started\n");
 
 	const auto close_client =
 		[](int client_fd)
 		{
-			auto& pollable = g_pollables[client_fd];
+			auto& epoll_thingy = g_epoll_thingies[client_fd];
-			ASSERT(pollable.type == Pollable::Type::Client);
+			ASSERT(epoll_thingy.type == EpollThingy::Type::Client);
-			auto& client_info = pollable.value.get<Client>();
+			auto& client_info = epoll_thingy.value.get<Client>();
 
 			dprintln("client {} disconnected", client_fd);
 
@@ -311,68 +372,39 @@ int main()
 				g_objects.remove(it);
 			}
 
-			g_pollables.remove(client_fd);
+			epoll_ctl(g_epoll_fd, EPOLL_CTL_DEL, client_fd, nullptr);
+			g_epoll_thingies.remove(client_fd);
 			close(client_fd);
 
-			if (g_server_grabber_fd == client_fd)
+			if (client_fd == g_server_grabber_fd)
+			{
 				g_server_grabber_fd = -1;
-		};
 
-	Client dummy_client {};
+				for (const auto& [_, thingy] : g_epoll_thingies)
-	MUST(g_objects.insert(g_root.windowId,
+				{
-		MUST(BAN::UniqPtr<Object>::create(Object {
+					if (thingy.type != EpollThingy::Type::Client)
-			.type = Object::Type::Window,
+						continue;
-			.object = Object::Window {
+
-				.owner = dummy_client,
+					auto& other_client = thingy.value.get<Client>();
-				.mapped = true,
+
-				.depth = g_root.rootDepth,
+					uint32_t events = EPOLLIN;
-				.parent = None,
+					if (other_client.has_epollout)
-				.c_class = InputOutput,
+						events |= EPOLLOUT;
-				.width = g_root.pixWidth,
+
-				.height = g_root.pixHeight,
+					epoll_event event { .events = events, .data = { .fd = other_client.fd } };
+					epoll_ctl(g_epoll_fd, EPOLL_CTL_MOD, other_client.fd, &event);
+				}
 			}
-		}))
+		};
-	));
-
-	MUST(g_objects.insert(g_visual.visualID,
-		MUST(BAN::UniqPtr<Object>::create(Object {
-			.type = Object::Type::Visual,
-		}))
-	));
 
 	for (;;)
 	{
-		BAN::Vector<pollfd> pollfds;
+		epoll_event events[16];
-		MUST(pollfds.reserve(g_pollables.size() + 1));
+		const int event_count = epoll_wait(g_epoll_fd, events, 16, -1);
-		MUST(pollfds.push_back({
+
-			.fd = server_sock,
+		for (int i = 0; i < event_count; i++)
-			.events = POLLIN,
-			.revents = 0,
-		}));
-		for (auto& [fd, pollable] : g_pollables)
 		{
-			short events = 0;
+			if (events[i].data.ptr == nullptr)
-			if (g_server_grabber_fd == -1 || g_server_grabber_fd == fd)
-				events |= POLLIN;
-			if (pollable.type == Pollable::Type::Client && !pollable.value.get<Client>().output_buffer.empty())
-				events |= POLLOUT;
-			if (events == 0)
-				continue;
-			MUST(pollfds.push_back(pollfd {
-				.fd = fd,
-				.events = events,
-				.revents = 0,
-			}));
-		}
-
-		const int event_count = poll(pollfds.data(), pollfds.size(), -1);
-
-		for (const auto& pollfd : pollfds)
-		{
-			if (pollfd.revents == 0)
-				continue;
-
-			if (pollfd.fd == server_sock)
 			{
 				int client_sock = accept(server_sock, nullptr, nullptr);
 				if (client_sock == -1)
@@ -390,8 +422,8 @@ int main()
 					client_pid = client_cred.pid;
 #endif
 
-				MUST(g_pollables.insert(client_sock, {
+				MUST(g_epoll_thingies.insert(client_sock, {
-					.type = Pollable::Type::Client,
+					.type = EpollThingy::Type::Client,
 					.value = Client {
 						.fd = client_sock,
 						.state = Client::State::ConnectionSetup,
@@ -399,32 +431,44 @@ int main()
 					}
 				}));
 
+				uint32_t events = 0;
+				if (g_server_grabber_fd == -1)
+					events |= EPOLLIN;
+
+				epoll_event event = { .events = events, .data = { .fd = client_sock } };
+				if (epoll_ctl(g_epoll_fd, EPOLL_CTL_ADD, client_sock, &event) == -1)
+				{
+					perror("xbanan: epoll_ctl");
+					close(client_sock);
+					continue;
+				}
+
 				dprintln("client {} connected", client_sock);
 				continue;
 			}
 
-			auto it = g_pollables.find(pollfd.fd);
+			auto it = g_epoll_thingies.find(events[i].data.fd);
-			if (it == g_pollables.end())
+			if (it == g_epoll_thingies.end())
 				continue;
-			auto& pollable = it->value;
+			auto& epoll_thingy = it->value;
 
-			if (pollable.type == Pollable::Type::Event)
+			if (epoll_thingy.type == EpollThingy::Type::Event)
 			{
-				g_platform_ops.poll_events(pollable.value.get<void*>());
+				g_platform_ops.poll_events(epoll_thingy.value.get<void*>());
 				continue;
 			}
 
-			ASSERT(pollable.type == Pollable::Type::Client);
+			ASSERT(epoll_thingy.type == EpollThingy::Type::Client);
 
-			auto& client_info = pollable.value.get<Client>();
+			auto& client_info = epoll_thingy.value.get<Client>();
 
-			if (pollfd.revents & POLLHUP)
+			if (events[i].events & EPOLLHUP)
 			{
 				close_client(client_info.fd);
 				continue;
 			}
 
-			if (pollfd.revents & POLLOUT)
+			if (events[i].events & EPOLLOUT)
 			{
 				const ssize_t nsend = send(
 					client_info.fd,
@@ -451,11 +495,28 @@ int main()
 				);
 				MUST(client_info.output_buffer.resize(client_info.output_buffer.size() - nsend));
 
+				if (client_info.output_buffer.empty())
+				{
+					uint32_t events = 0;
+					if (g_server_grabber_fd == -1 || g_server_grabber_fd == client_info.fd)
+						events |= EPOLLIN;
+
+					epoll_event event { .events = events, .data = { .fd = client_info.fd } };
+					if (epoll_ctl(g_epoll_fd, EPOLL_CTL_MOD, client_info.fd, &event) == -1)
+					{
+						perror("xbanan: epoll_ctl");
+						close_client(client_info.fd);
+						continue;
+					}
+
+					client_info.has_epollout = false;
+				}
+
 			send_done:
 				(void)0;
 			}
 
-			if (!(pollfd.revents & POLLIN))
+			if (!(events[i].events & EPOLLIN))
 				continue;
 
 			if (g_server_grabber_fd != -1 && g_server_grabber_fd != client_info.fd)
@@ -567,5 +628,42 @@ int main()
 				}
 			}
 		}
+
+		for (auto& [_, object] : g_objects)
+		{
+			if (object->type != Object::Type::Window)
+				continue;
+			auto& window = object->object.get<Object::Window>();
+			if (!window.platform_window_invalidated)
+				continue;
+			if (g_platform_ops.end_frame)
+				g_platform_ops.end_frame(window.platform_window.ptr());
+			window.platform_window_invalidated = false;
+		}
+
+	iterator_invalidated:
+		for (auto& [_, thingy] : g_epoll_thingies)
+		{
+			if (thingy.type != EpollThingy::Type::Client)
+				continue;
+
+			auto& client_info = thingy.value.get<Client>();
+			if (client_info.output_buffer.empty() || client_info.has_epollout)
+				continue;
+
+			uint32_t events = EPOLLOUT;
+			if (g_server_grabber_fd == -1 || g_server_grabber_fd == client_info.fd)
+				events |= EPOLLIN;
+
+			epoll_event event { .events = events, .data = { .fd = client_info.fd } };
+			if (epoll_ctl(g_epoll_fd, EPOLL_CTL_MOD, client_info.fd, &event) == -1)
+			{
+				perror("xbanan: epoll_ctl");
+				close_client(client_info.fd);
+				goto iterator_invalidated;
+			}
+
+			client_info.has_epollout = true;
+		}
 	}
 }