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    • By Josheir
      I am working on a SFML c++ program that uses two rendering windows passed from main to the function drawmessage in a class textmessage.  I was using the second window for displaying debug information that is displayed because I could not get the appropriate information from the SFML object.
      With that said, here is the part of that function that works the first time through and does not on the second usage.  I really have changed the code to try and get it working.   For example I created the two objects locally here for testing.  I am sorry about the extra commented statements they help convey the message too.
      There is the same problem though, the statement :     string test =     message_holder10.getString(); is working and shows "asty" on every run.  On the first run of the program there is a display of the text correctly however on the second call there is no display of it.  (I am stepping through until the display command.)
      I feel like I have exhausted my tries so I am asking for help please.
      If it is the font I will just die, I really don't think it is.
       
       
       
                  sf::Text message_holder10;
                  sf::RenderWindow windowtype3(sf::VideoMode(700, 1000), "a");

                  if ((space_is_used && on_last_line) || (space_is_used && ((line_number) == (total_lines - 2))))
                  {

                      //string temp_string = message::Get_Out_Bound_String();
                      //int length_of_string = temp_string.length();
                      sf::Font Fontforscore;
                      if (gflag == 0)
                      {
                          gflag = 1;
                          
                          if (!Fontforscore.loadFromFile("ARIALBD.ttf"))
                          {
                              exit(1);
                          }

                          message_holder10.setFont(Fontforscore);
                          message_holder10.setCharacterSize(100);
                          message_holder10.setFillColor(sf::Color::Red);
                          message_holder10.setOrigin(0, 0);
                          message_holder10.setPosition(0, 0);
                          windowtype2.close();
                      }
                      message_holder10.setString("asty");
                          
                          //int y_for_space = display_y_setting + (total_lines - 2) * each_vertical_offset_is;
                          //int this_width = 0;
                          
                          //float x = message_holder.getLocalBounds().width;

                          
                          
                          //message_holder.setPosition( ( (first_width - x )/2), y_for_space);
                          
                  
                          //windowtype2.close();

                          string test =     message_holder10.getString();
                          
                          windowtype3.clear();
                          windowtype3.draw(message_holder10);
                          windowtype3.display();
                          
                          
                           
       
                          //windowtype.display();
                      

                       Wait_For_Space_Press();
                      
       
      /////////////////////////
       
      Before, the :      windowtype3.display()  without the clear was drawing other text in this call, just not this one particular text message with it!
       
      Thank you so much I am wondering what it can be,
       
      Josheir
    • By Tispe
      Hi
      I want to test out a polymorphic entity component system where the idea is that the components of an entity are "compositioned" using templated multiple inheritance. But I am running into an issue because I am stacking a bunch of methods with the same names inside a class (but they have different signatures). I want these methods to be overloaded by the template type but my compiler says the access is ambiguous. I have issues making them unambiguous with the using declaration because the paramter pack expansion causes a syntax error.
      Can anyone here give me some advice on this?
       
      template <class T> class component { T m_data; protected: component() {}; ~component() {}; public: void set(const T& data) { m_data = data; }; }; template <class ...Ts> class entity : public component<Ts>... { public: entity() {}; ~entity() {}; //using component<Ts>::set...; // syntax error }; struct position { float x{}; float y{}; float z{}; }; struct velocity { float x{}; float y{}; float z{}; }; int main() { entity<position, velocity> myEntity; position pos = { 1.0f, 1.0f, 1.0f }; velocity vel = { 2.0f, 2.0f, 2.0f }; myEntity.set(pos); // error C2385: ambiguous access of 'set' //myEntity.set(vel); return 0; }  
    • By Baemz
      Hello,
      I've been working on some culling-techniques for a project. We've built our own engine so pretty much everything is built from scratch. I've set up a frustum with the following code, assuming that the FOV is 90 degrees.
      float angle = CU::ToRadians(45.f); Plane<float> nearPlane(Vector3<float>(0, 0, aNear), Vector3<float>(0, 0, -1)); Plane<float> farPlane(Vector3<float>(0, 0, aFar), Vector3<float>(0, 0, 1)); Plane<float> right(Vector3<float>(0, 0, 0), Vector3<float>(angle, 0, -angle)); Plane<float> left(Vector3<float>(0, 0, 0), Vector3<float>(-angle, 0, -angle)); Plane<float> up(Vector3<float>(0, 0, 0), Vector3<float>(0, angle, -angle)); Plane<float> down(Vector3<float>(0, 0, 0), Vector3<float>(0, -angle, -angle)); myVolume.AddPlane(nearPlane); myVolume.AddPlane(farPlane); myVolume.AddPlane(right); myVolume.AddPlane(left); myVolume.AddPlane(up); myVolume.AddPlane(down); When checking the intersections I am using a BoundingSphere of my models, which is calculated by taking the average position of all vertices and then choosing the furthest distance to a vertex for radius. The actual intersection test looks like this, where the "myFrustum90" is the actual frustum described above.
      The orientationInverse is the viewMatrix in this case.
      bool CFrustum::Intersects(const SFrustumCollider& aCollider) { CU::Vector4<float> position = CU::Vector4<float>(aCollider.myCenter.x, aCollider.myCenter.y, aCollider.myCenter.z, 1.f) * myOrientationInverse; return myFrustum90.Inside({ position.x, position.y, position.z }, aCollider.myRadius); } The Inside() function looks like this.
      template <typename T> bool PlaneVolume<T>::Inside(Vector3<T> aPosition, T aRadius) const { for (unsigned short i = 0; i < myPlaneList.size(); ++i) { if (myPlaneList[i].ClassifySpherePlane(aPosition, aRadius) > 0) { return false; } } return true; } And this is the ClassifySpherePlane() function. (The plane is defined as a Vector4 called myABCD, where ABC is the normal)
      template <typename T> inline int Plane<T>::ClassifySpherePlane(Vector3<T> aSpherePosition, float aSphereRadius) const { float distance = (aSpherePosition.Dot(myNormal)) - myABCD.w; // completely on the front side if (distance >= aSphereRadius) { return 1; } // completely on the backside (aka "inside") if (distance <= -aSphereRadius) { return -1; } //sphere intersects the plane return 0; }  
      Please bare in mind that this code is not optimized nor well-written by any means. I am just looking to get it working.
      The result of this culling is that the models seem to be culled a bit "too early", so that the culling is visible and the models pops away.
      How do I get the culling to work properly?
      I have tried different techniques but haven't gotten any of them to work.
      If you need more code or explanations feel free to ask for it.

      Thanks.
       
    • By AyeRonTarpas
      A friend of mine and I are making a 2D game engine as a learning experience and to hopefully build upon the experience in the long run.

      -What I'm using:
          C++;. Since im learning this language while in college and its one of the popular language to make games with why not.     Visual Studios; Im using a windows so yea.     SDL or GLFW; was thinking about SDL since i do some research on it where it is catching my interest but i hear SDL is a huge package compared to GLFW, so i may do GLFW to start with as learning since i may get overwhelmed with SDL.  
      -Questions
      Knowing what we want in the engine what should our main focus be in terms of learning. File managements, with headers, functions ect. How can i properly manage files with out confusing myself and my friend when sharing code. Alternative to Visual studios: My friend has a mac and cant properly use Vis studios, is there another alternative to it?  
    • By Defend
      Not asking about singletons here (nor advocating). With that clarified:
      If we assume someone wants a global + unique object, why isn't a namespace always the preferred approach in C++, over implementing a singleton class?
      I've only seen the namespace approach encouraged when there aren't statics being shared. Eg; from Google's style guidelines:
      But why not have non-member functions that share static data, declared in an unnamed namespace? And why isn't this generally suggested as a better alternative to writing a singleton class in C++?
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