26.4. OpenGL code in Windows
OpenGL is a platform-neutral library. It can run on operating systems such as X-Windows, the Macintosh, or Windows. In each of these systems you add a little extra code in order to interface your system to OpenGL.
The basic Win32 library includes a few built-in data types and functions to be used with OpenGL. Here’s a block of code that shows how we initialize a window and update it. The data types PIXELFORMATDESCRIPTOR and HGLR are special built-in Windows types used for working with OpenGL. And ::ChoosePixelFormat, ::SelectPixelFormat, ::wglCreateContext, and ::SwapBuffers are built-in Windows methods for use with OpenGL.
PIXELFORMATDESCRIPTOR pixelformat; int pixelformat_index; HGLR openglrenderingcontext; HDC ...
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