programming hints
OpenGL performance hints
Chapter 552
OpenGL performance hints
Hints provided in this section are intended to help improve your
applications performance when using HP’s implementation of OpenGL.
display list performance
The topics covered here are areas where you can gain substantial
improvements in program performance when using OpenGL display
lists. Here is a list of the topics that are covered:
• geometric primitives
• GL_COMPILE_AND_EXECUTE mode
•textures
• state changes and their effects on display lists
• regular primitive data.
geometric primitives
Geometric primitives will typically be faster in a display list than by
using immediate mode. Each display list should have numerous
primitives to ensure good performance. As a general rule, larger
primitives will be faster than smaller ones. Performance gains here can
be dramatic. For example, it is possible that a single GL_TRIANGLES
primitive with 20 or so triangles will render three times faster than 20
GL_TRIANGLES primitives with a single triangle in each one.
GL_COMPILE_AND_EXECUTE mode
Due to the pre-processing of the display list, and execution performance
enhancements, creating a display list using the
GL_COMPILE_AND_EXECUTE mode will reduce program performance. If
you need to improve your programs performance, do not create a display
list using the GL_COMPILE_AND_EXECUTE mode. You will find that it is
easier and faster to create the display list using the GL_COMPILE mode,
and then execute the list after it is created.
OGLImp.book Page 52 Tuesday, February 14, 2006 9:15 AM
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