feat(render): add model loading and rendering pipeline

include/Cubed/render/model_node.hpp

@@ -0,0 +1,42 @@
+#pragma once
+
+#include "Cubed/primitive_data.hpp"
+#include "Cubed/render/texture.hpp"
+#include "Cubed/render/vertex_array.hpp"
+#include "Cubed/render/vertex_buffer.hpp"
+
+#include <glad/glad.h>
+#include <glm/glm.hpp>
+#include <memory>
+#include <string>
+namespace Cubed {
+
+struct Mesh {
+    std::vector<Vertex3D> vertices;
+    std::vector<uint32_t> indices;
+    std::unique_ptr<VertexBuffer> vbo;
+    std::unique_ptr<VertexBuffer> ebo;
+    std::unique_ptr<VertexArray> vao;
+    std::unique_ptr<Texture> texture;
+    void upload() {
+        vao = std::make_unique<VertexArray>();
+        vao->bind();
+        vbo = std::make_unique<VertexBuffer>();
+        vbo->buffer_data(vertices.data(), vertices.size() * sizeof(Vertex3D));
+        ebo = std::make_unique<VertexBuffer>(BufferType::ELEMENT_ARRAY_BUFFER);
+        ebo->buffer_data(indices.data(), indices.size() * sizeof(uint32_t));
+        vao->attribute(0, 3, GL_FLOAT, sizeof(Vertex3D), (void*)0);
+        vao->attribute(1, 2, GL_FLOAT, sizeof(Vertex3D),
+                       (void*)offsetof(Vertex3D, s));
+        vao->attribute(2, 3, GL_FLOAT, sizeof(Vertex3D),
+                       (void*)offsetof(Vertex3D, nx));
+    };
+};
+struct ModelNode {
+    std::string name;
+    glm::mat4 transform{1.0f};
+    std::vector<Mesh> meshes;
+    std::vector<ModelNode> children;
+};
+
+} // namespace Cubed