improved model loading and added model component

open_engine/include/open_engine/renderer/model3d.hpp

@@ -0,0 +1,69 @@
+#ifndef MODEL3D_HPP
+#define MODEL3D_HPP
+
+#include "open_engine/core/uuid.hpp"
+#include "open_engine/renderer/vertex_array.hpp"
+#include <cstddef>
+#include <cstdint>
+#include <glm/glm.hpp>
+#include <vector>
+
+namespace OpenEngine {
+
+    struct Material
+    {
+        glm::vec4 albedo = { 1.0f, 0.0f, 0.8f, 1.0f };
+        float roughness = 1.0f;
+        float metallic = 1.0f;
+        float ambient_strength = 1.0f;
+        float specular_strength = 1.0f;
+        std::string name = "un-named material";
+    };
+
+    struct MeshVertex
+    {
+        glm::vec3 position;
+        glm::vec3 normal;
+        glm::vec2 text_coords;
+    };
+
+    struct Mesh
+    {
+        UUID uuid;
+
+        Material material;
+
+        Ref<VertexArray> vertex_array;
+        Ref<VertexBuffer> vertex_buffer;
+        Ref<IndexBuffer> index_buffer;
+
+        // TODO: Make them a ptr or something
+        std::vector<MeshVertex> vertices;
+        std::vector<uint32_t> indices;
+    };
+
+    // TODO: Model3D.Instanciate();
+    // Or Model3D.GetVertices() {return iterateaccessorwithindex bla bla bla}
+    // What data should Model3D hold in the end if it is not a renderable object?
+    class Model3D
+    {
+        public:
+            virtual ~Model3D() = default;
+
+            static Ref<Model3D> Create(const char* path);
+
+            virtual const Mesh& GetMesh(int index) const = 0;
+            virtual const std::vector<Mesh>& GetMeshes() const = 0;
+
+            virtual size_t GetMeshCount() const = 0;
+
+            virtual std::vector<Mesh>::iterator begin() = 0;
+            virtual std::vector<Mesh>::iterator end() = 0;
+
+            virtual std::vector<Mesh>::const_iterator begin() const = 0;
+            virtual std::vector<Mesh>::const_iterator end() const = 0;
+    };
+
+}
+
+#endif // MODEL3D_HPP