OpenGL Programming Guide

Appendix CThe OpenGL Utility Library

Manipulating Images for Use in Texturing

As you set up texture mapping in your application, you'll probably want to take advantage of mipmapping, which requires a series of reduced images (or texture maps). To support mipmapping, the GLU includes a general routine that scales images (gluScaleImage()) and routines that generate a complete set of mipmaps given an original image in one or two dimensions (gluBuild1DMipmaps() and gluBuild2DMipmaps()). These routines are all discussed in some detail in Chapter 9 , so here only their prototypes are listed:

GLint gluScaleImage(GLenum format, GLint widthin, GLint heightin, GLenum typein, const void *datain, GLint widthout, GLint heightout, GLenum typeout, void *dataout);

GLint gluBuild1DMipmaps(GLenum target, GLint components, GLint width, GLenum format, GLenum type, void *data);

GLint gluBuild2DMipmaps(GLenum target, GLint components, GLint width, GLint height, GLenum format, GLenum type, void *data);

OpenGL Programming Guide