added files

include/Mesh.hpp

@@ -0,0 +1,54 @@
+#pragma once
+
+#include "GLFunctions.hpp"
+
+#include <glm/glm.hpp>
+#include <vector>
+
+namespace planetarium {
+
+// -----------------------------------------------------------------------
+// Mesh
+//
+// Owns a VAO/VBO/(optional)EBO describing an interleaved
+// position+normal+uv vertex stream, plus static factory methods that
+// procedurally build a few common primitive shapes (spheres, rings,
+// circles) so a project has no dependency on external model files.
+// -----------------------------------------------------------------------
+struct Vertex {
+    glm::vec3 position;
+    glm::vec3 normal;
+    glm::vec2 uv;
+};
+
+class Mesh {
+public:
+    Mesh() = default;
+    ~Mesh();
+
+    Mesh(const Mesh&) = delete;
+    Mesh& operator=(const Mesh&) = delete;
+    Mesh(Mesh&& other) noexcept;
+    Mesh& operator=(Mesh&& other) noexcept;
+
+    void upload(const std::vector<Vertex>& vertices, const std::vector<unsigned int>& indices);
+    void uploadLineStrip(const std::vector<glm::vec3>& points);
+    void draw() const;
+    void drawLineStrip() const;
+
+    static Mesh createUVSphere(int stacks, int slices);
+    static Mesh createRing(float innerRadius, float outerRadius, int segments);
+    static Mesh createOrbitCircle(int segments);  // unit circle in XZ
+
+private:
+    void release();
+
+    GLuint vao_ = 0;
+    GLuint vbo_ = 0;
+    GLuint ebo_ = 0;
+    GLsizei indexCount_ = 0;
+    GLsizei vertexCount_ = 0;
+    bool isLineStrip_ = false;
+};
+
+}  // namespace planetarium