RE: Designing a renderer

We don't pass in the HWND to our renderer but rather let it use Win32 API
calls to get the HWND.
We pass in the title string of the window from our main app to the renderer
init function.  This is ignored for those renderers that don't need it.
Another option is to pass in argc, argv like variables to the Init of the
renderer.

Jake

-----Original Message-----
From: Timur Davidenko [mailto:[email protected]]
Sent: 02 July 2003 08:35
To: [email protected]
Subject: RE: [GD-Design] Designing a renderer


Actually HWND is a simple handle and can be passed just as a void*,
Sure you can make more general abstraction and create OS independed Window
class, but OSes can differ greatly and its hard to get it right at start.
If i would want to make stuff simple, some common initialzation structure
like
struct RendererInitParams
{
  void *hwnd;
  .. some other stuff. 
}
then DX renderer can be only on windows platform
so it is compiled with windows headers, simple cast void *hwnd into HWND
internally.
in OGL renderer you can used defines to see OS and use either windows code
and use void *hwnd, or if its Linux ignore this value.

Not a most generic solution in the world, but its fast to get running and
actually quite flexible, considering that you dont have 300 different OSes
arround.
and getting universal portable window class other all OSes and Consoles are
a task by itelf and you should consider do you really want to spent time on
this.

_________________________________
Timur Davidenko.
Crytek Studios (http://www.crytek.com)


-----Original Message-----
From: Dirk Gregorius [mailto:[email protected]]
Sent: Tuesday, July 01, 2003 11:19 AM
To: [email protected]
Subject: [GD-Design] Designing a renderer


Hi,

I am wondering how you implement your render interfaces? On what abstraction
level is a renderer normally implemented - what are the typical functions
and classes? Do you pass a renderer reference to all renderable entities?
And how is platform independence achieved - do you use polymorphism or for
example the "Bridge" pattern - that by its definition seperates abstraction
and implementation? Maybe you can give me some tips.

One thing that I really don't understand is how to implement the
initialisation such that it works platform independent? E.g: Let's say we
have a base class IRenderer which is implemented by two derived class
COGLRendererImpl and CDXRendererImpl. Both derived classes implement a
virtual function IRenderer::Init(...). The arguments vary with the OS. On a
Windows platform you have to pass the HWND for the window, on a Linux system
that could be totally different. What is the best to handle this?

Hopefully I could make myself clear.  Every help is appreciated!!

Best regards


Dirk



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