Create C++ backend UI code

src/ui/manager.cpp

@@ -0,0 +1,123 @@
+// Luanti
+// SPDX-License-Identifier: LGPL-2.1-or-later
+// Copyright (C) 2023 v-rob, Vincent Robinson <robinsonvincent89@gmail.com>
+
+#include "ui/manager.h"
+
+#include "debug.h"
+#include "log.h"
+#include "settings.h"
+#include "client/client.h"
+#include "client/renderingengine.h"
+#include "client/texturesource.h"
+#include "client/tile.h"
+#include "util/serialize.h"
+
+namespace ui
+{
+	video::ITexture *Manager::getTexture(const std::string &name) const
+	{
+		return m_client->tsrc()->getTexture(name);
+	}
+
+	float Manager::getScale(WindowType type) const
+	{
+		if (type == WindowType::GUI || type == WindowType::CHAT) {
+			return m_gui_scale;
+		}
+		return m_hud_scale;
+	}
+
+	void Manager::reset()
+	{
+		m_client = nullptr;
+
+		m_windows.clear();
+	}
+
+	void Manager::removeWindow(u64 id)
+	{
+		auto it = m_windows.find(id);
+		if (it == m_windows.end()) {
+			errorstream << "Window " << id << " is already closed" << std::endl;
+			return;
+		}
+
+		m_windows.erase(it);
+	}
+
+	void Manager::receiveMessage(const std::string &data)
+	{
+		auto is = newIs(data);
+
+		u32 action = readU8(is);
+		u64 id = readU64(is);
+
+		switch (action) {
+		case REOPEN_WINDOW: {
+			u64 close_id = readU64(is);
+			removeWindow(close_id);
+
+			[[fallthrough]];
+		}
+
+		case OPEN_WINDOW: {
+			auto it = m_windows.find(id);
+			if (it != m_windows.end()) {
+				errorstream << "Window " << id << " is already open" << std::endl;
+				break;
+			}
+
+			it = m_windows.emplace(id, id).first;
+			if (!it->second.read(is, true)) {
+				errorstream << "Fatal error when opening window " << id <<
+					"; closing window" << std::endl;
+				removeWindow(id);
+				break;
+			}
+			break;
+		}
+
+		case UPDATE_WINDOW: {
+			auto it = m_windows.find(id);
+			if (it == m_windows.end()) {
+				errorstream << "Window " << id << " does not exist" << std::endl;
+			}
+
+			if (!it->second.read(is, false)) {
+				errorstream << "Fatal error when updating window " << id <<
+					"; closing window" << std::endl;
+				removeWindow(id);
+				break;
+			}
+			break;
+		}
+
+		case CLOSE_WINDOW:
+			removeWindow(id);
+			break;
+
+		default:
+			errorstream << "Invalid manager action: " << action << std::endl;
+			break;
+		}
+	}
+
+	void Manager::preDraw()
+	{
+		float base_scale = RenderingEngine::getDisplayDensity();
+		m_gui_scale = base_scale * g_settings->getFloat("gui_scaling");
+		m_hud_scale = base_scale * g_settings->getFloat("hud_scaling");
+	}
+
+	void Manager::drawType(WindowType type)
+	{
+		for (auto &it : m_windows) {
+			if (it.second.getType() == type) {
+				it.second.drawAll();
+			}
+		}
+	}
+
+	Manager g_manager;
+}