View Full Version : RC-DC--GDI
08-27-2001, 06:07 AM
where can we get info abt device context,rendering context and Graphics Device Interface..can u explain the relation between the three......
08-27-2001, 10:55 AM
MSDN has everything you want about this: http://msdn.microsoft.com/
A device context is what you use to render to a window (GDI functions), myDC = GetDC( hWnd);
A rendering context is what you get from:
myRC = wglCreateContext( myDC);
The rendering context is what OpenGL use to render it's output, the rendering context is connected to the device context.
So what you do is that you create a Window, then get a DC from the Window, then you can create a rendering context from the DC.
All OpenGL functions are executed on the current active rendering context, you can select which one with: wglMakeCurrent( myDC, myRC);
If you want to mix GDI output With OpenGL output you must turn of doublebuffering and set a flag that you want to mix GDI with OpenGL output.
Hope that helps a bit.
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