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  Tutorial: C and Cpp Graphics Intro to WGL Tutorial

Intro to Windows Graphics Layer.

Tutorial Details:

Introduction to WGL

The simple fact that OpenGL is only a graphics API means that any user interaction, or things like screen and window issues needs to be handled by the operating system. Most operating systems come with a set of extensions that tie OpenGL together with user interaction and window management. This tends to make our lives a little bit easier, but only if we know how to take advantage of this option. In Windows this set of functions are called the wiggle functions. Each of these functions is prefixed with wgl.

To maintain the portability of OpenGL, each operating system must supply functionality for specifying the rendering window before OpenGL can use it. In Windows the Graphics Device Interface uses a device context to remember settings about drawing modes and commands, but in OpenGL the rendering context is used to remember these things. You need to remember, however, that the device context is not a rendering context. The device context MUST be specified in a GDI call, unlike a rendering context, which is specified in an OpenGL call.

If you wish to render more than one window at once, multiple rendering contexts are allowed. You must ensure, however, that the proper rendering context is being used on the proper window. Another thing to remember is that OpenGL is thread-safe. You can have multiple threads rendering to the same device context at one time.


 

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