Remove useless clear and if for optimisation

source/engine/graphics/front/engine/Engine.cpp

@@ -27,7 +27,6 @@ namespace megu {
 
             // Merge Textures
             FrameBuffer::BindDefaultFrameBuffer();
-            this->_renderer.clear();
             this->_renderer.render(this->_window, this->_group, textures);
             this->_window.swapBuffers();
         }

source/engine/graphics/front/engine/Layer.cpp

@@ -12,15 +12,11 @@ namespace megu {
     }
 
     const Texture & Layer::draw(const Window & window, const TextureArray & textures) const {
-        if(this->_frameBuffer.usable()) {
-            this->_renderer.setClearColor(0.f, 0.f, 0.f, 0.f);
-            this->_renderer.clear();
         this->_frameBuffer.bind();
 
         for(auto &[priority, group] : this->_objects) {
             this->_renderer.render(window, *group, textures);
         }
-        }
         
         return this->_frameBuffer.texture();
     }

source/engine/graphics/front/group/FrameBufferGroup.cpp

@@ -21,7 +21,6 @@ namespace megu {
     }
 
     void FrameBufferGroup::draw(const Window & window, const Camera & camera, const TextureArray & textures) const {
-        if(window.isOpen()) {
         this->_program.use();
         this->_vao.bind();
 
@@ -34,4 +33,3 @@ namespace megu {
         glDrawArrays(Plane::Primitive(), 0, static_cast<GLsizei>(Plane::Vertices().size()));
     }
 }
\ No newline at end of file
-}
\ No newline at end of file

source/engine/graphics/front/group/ImageGroup.cpp

@@ -70,8 +70,6 @@ namespace megu {
             }
         }
 
-        //std::cout << "---------------" << std::endl;
-
         if(!textures.empty()) {
             this->_program.setUniform("uProj", camera.projection());
             this->_program.setUniform("uView", camera.view());