🔒 Locked

API independant engine

Started by kulik May 16, 2004 at 7:26 AM 3 replies 400+ views

Original Post

May 16, 2004 at 7:26 AM

I want to write API independant engine. I want to use OpenGL and Direct3D for graphics. I understand both, but how to put it together? Polymorphic classes for OpenGL and DirectX drawing or drivers? How games like HalfLife took care about that?

fyhuang

May 16, 2004 at 8:12 AM

Try using a central interface:



class CGraphics
{
    virtual void SetMode( int w, int h );
};



And deriving a seperate class for each API:

   

class CDirectX : CGraphics
{
    LPDIRECT3DDEVICE8 Device;
    void SetMode( int w, int h );
};

class COpenGL : CGraphics
{
    GLRC hRC;
    void SetMode( int w, int h );
};

And then all you would have to do is to keep a pointer to a CGraphics interface and dynamically allocate whichever class you need.

[edit]Forgot to declare as virtual...

[edited by - fyhuang on May 16, 2004 9:13:37 AM]