Added UI class and UI rendering class

src/ui/managers/GameUIManager.cpp

@@ -0,0 +1,43 @@
+#include "GameUIManager.h"
+
+GameUIManager::GameUIManager()
+{
+
+}
+
+GameUIManager::~GameUIManager() {
+
+}
+
+void GameUIManager::init() {
+    auto button = std::make_unique<Button>();
+    button->setBackgroundColor({255, 100, 0, 255});
+    button->setBorder(2, {0, 0, 0, 255});
+    button->setPosition(20, 20);
+    button->setEnabled(true);
+    button->setVisible(true);
+    button->setText("hello,world!!", {"SourceHanSansSC-Regular.otf", 48, {0, 0, 0, 255}});
+    m_buttons.push_back(std::move(button));
+}
+
+
+
+const UIRenderData& GameUIManager::getUIRenderData() {
+    CollectRenderData();
+    return m_uiRenderData;
+}
+
+void GameUIManager::CollectRenderData() {
+
+    //SDL_Log("CollectRenderData called. buttons count = %zu", m_buttons.size());
+    // 清理上一帧的数据
+    m_uiRenderData.buttons.clear();
+    //SDL_Log("collect data\n");
+    for (auto& button : m_buttons) {
+        if(!button->isVisible()) {
+            continue;
+    
+        }
+        m_uiRenderData.buttons.push_back(button->getButtonDate());
+    }
+}