overview of OpenGL
the OpenGL product
Chapter 1 15
at some loss of performance. For full single display performance, define
the HPOGL_SLS_LOCK_WINDOW environment variable before
executing the program. The define value should be the display number
where the window will reside. When the window is on this display, full
performance can be had; when it is on other displays, the window will be
blank. For more information see the XServer documentation of SLS.
the standard OpenGL product
This section covers the following topics:
• The OpenGL Utilities Library (GLU)
• Input and Output Routines
• The OpenGL Extensions for the X Window System (GLX)
the OpenGL Utilities Library (GLU)
The OpenGL Utilities Library (GLU) provides a useful set of drawing
routines that perform such tasks as:
• Generating texture coordinates
• Transforming coordinates
• Tessellating polygons
• Rendering surfaces
• Providing descriptions of curves and surfaces (NURBS)
• Handling errors
For a detailed description of these routines, refer to the Reference section
or the OpenGL Reference Manual.
input and output routines
OpenGL was designed to be independent of operating systems and
window systems, therefore, it does not have commands that perform such
tasks as reading events from a keyboard or mouse, or opening windows.
To obtain these capabilities, you will need to use X Windows routines
(those whose names start with “glX”).
the OpenGL extensions for the X Window system (GLX)
The OpenGL Extensions to the X Window System (GLX) provide
routines for:
• Choosing a visual
• Managing the OpenGL rendering context
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