feat: add basic towers rendering

include/render/VertexCache.h

@@ -0,0 +1,34 @@
+#include <unordered_map>
+#include <cstdint>
+#include <memory>
+
+#include "render/loader/GLLoader.h"
+
+
+namespace td {
+namespace render {
+
+
+class VertexCache {
+
+typedef std::vector<float> Vector;
+typedef std::pair<Vector::iterator, Vector::iterator> ElementsIndex;
+typedef std::pair<ElementsIndex, ElementsIndex> DataIndex;
+
+private:
+    Vector m_Positions;
+    Vector m_Colors;
+    std::unordered_map<std::uint64_t, DataIndex> m_Indexes;
+    std::unique_ptr<GL::VertexArray> m_VertexArray;
+public:
+    void addData(std::uint64_t index, std::vector<float> positions, std::vector<float> colors);
+    void removeData(std::uint64_t index);
+    void clear();
+    void updateVertexArray();
+
+    const GL::VertexArray& getVertexArray() const { return *m_VertexArray; }
+    bool isEmpty() const { return m_VertexArray == nullptr; }
+};
+
+} // namespace render
+} // namespace td