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    <p>Define an interface that is sufficient for your application's graphic output demands. Then implement this interface for every renderer you want to support.</p> <pre><code>class IRenderer { public: virtual ~IRenderer() {} virtual void RenderModel(CModel* model) = 0; virtual void DrawScreenQuad(int x1, int y1, int x2, int y2) = 0; // ...etc... }; class COpenGLRenderer : public IRenderer { public: virtual void RenderModel(CModel* model) { // render model using OpenGL } virtual void DrawScreenQuad(int x1, int y1, int x2, int y2) { // draw screen aligned quad using OpenGL } }; class CDirect3DRenderer : public IRenderer { // similar, but render using Direct3D }; </code></pre> <p>Properly designing and maintaining these interfaces can be very challenging though.</p> <p>In case you also operate with render driver dependent objects like textures, you can use a factory pattern to have the separate renderers each create their own implementation of e.g. ITexture using a factory method in IRenderer:</p> <pre><code>class IRenderer { //... virtual ITexture* CreateTexture(const char* filename) = 0; //... }; class COpenGLRenderer : public IRenderer { //... virtual ITexture* CreateTexture(const char* filename) { // COpenGLTexture is the OpenGL specific ITexture implementation return new COpenGLTexture(filename); } //... }; </code></pre> <p>Isn't it an idea to look at existing (3d) engines though? In my experience designing this kind of interfaces really distracts from what you actually want to make :)</p>
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    1. COBecause I already have the d3d9 stuff for everything I need, I just want the option to extend to other API's. Since I already have classes wrapping most d3d stuff (eg Texture, Sprite, Mesh), I could just overload those, leaving the actaul objects with API independent stuff.
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