[CORE][ADD] Enable cross context model transferring

- Reload texture on another context
- Copy meshes
- [BUG] memory leak (not fixed yet)

FinalProject/renderable.cpp

@@ -6,6 +6,10 @@ Renderable::Renderable(Model* model) : _model(model) {}
 
 Renderable::Renderable(Model* model, glm::vec3 position) : _model(model), _position(position) {}
 
+void Renderable::setModel(Model* model) {
+    _model = model;
+}
+
 void Renderable::move(glm::vec3 deltaVec) {
     _position += deltaVec;
 }
@@ -31,6 +35,11 @@ void Renderable::setScale(float scale) {
 }
 
 void Renderable::render(ShaderProgram shader) {
+    // Check if initialized
+    if (_model == nullptr) {
+        Logger::error("Tries to render an uninitialized renderable object");
+        return;
+    }
     // Set model matrix
     shader.setUniform("model", modelMatrix());
     // Render

FinalProject/renderable.h

@@ -7,8 +7,16 @@
 #include "shader.h"
 
 class Renderable {
+public:
+    static Renderable empty() {
+        return Renderable();
+    }
+
 private:
-    Model* _model;
+    Renderable() {}
+
+private:
+    Model* _model = nullptr;
     glm::vec3 _position = glm::vec3(0.0f);
     glm::mat4 _rotation = glm::mat4(1.0f);
     glm::vec3 _scale = glm::vec3(1.0f);
@@ -18,6 +26,7 @@ public:
     Renderable(Model* model, glm::vec3 position);
 
 public:
+    void setModel(Model* model);
     void move(glm::vec3 deltaVec);
     void setPosition(glm::vec3 position);
     void rotate(glm::vec3 axis, float deltaAngle);