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How to create an OpenGL DirectX Abstraction Layer

I read about creating graphics abstraction layers to make it convenient to switch between graphics platforms. Unfortunately, I could not find many details on this. Is this abstraction functionally achievable with something like this?

void pushMatrix(){
  if (directx){
     // do directx function

  }else if (opengl){
     // do opengl function
  }

}

How it works? Is there a better way? Can someone point me to some examples of things that this or more example code does?

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4 answers

It is usually done in such a way as to have an interface with a “universal” visualization tool:

class RendererInterface{
    virtual DrawMesh() = 0;
    virtual SwapBuffers() = 0;
    /// etc
}

with one implementation for each lib:

class OpenGLRenderer : public RendererInterface{
    virtual DrawMesh(){... }
    ....
}

But the concept is the same as Alexander’s answer.

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void functionA(...) {
  if (OpenGL) {
    glFuncA();
  } else {
    //store parameters
  }
}

void functionB(...) {
  if (OpenGL) {
    glFuncB();
  } else {
    dxFuncB();
    dxFuncA( saved params );
  }
}

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