README file from "texture" directory
~opengl2/examples/texture README
Copyright 1993, 1996, Silicon Graphics, Inc.
Technical Education Development
All Rights Reserved.
A collection of programs demonstrating basic texture
mapping using OpenGL.
texture.c
Reads in a texture from a .rgb file, sets up the texture and the
texture environment, then applies the texture to a rectangular
polygon using explicit texture coordinates.
Escape key - exits the program
mipmap.c
Reads in a texture from a .rgb file, uses the opengl utility
library routine gluBulid2dMipmaps() to scale and load mipmaps
for a single texture image, then applies the texture to a
rectangular polygon using explicit texture coordinates.
<a> key - pause/restart movement
<m> key - cycle minification filter
<M> key - cycle Magnification filter
<R> key - reset image to starting position
Escape Key - exit program
wrap.c
This program reads in a single image from a .rgb file, and
creates and load mipmaps of the image into texture memory. It
sets the texture up to clamp in the s dimension and repeat in
the t dimension, and then applies the texture to a rectangular
polygon using explicit texture coordinates outside the range
[0,1].
<a> key - pause/restart movement
Escape Key - exit program
borders.c: demonstrates how texture borders are used when textures wrap.
It specifies a border color of red which is averaged with the
texture edge when the texture is clamped, and the filtering
is not GL_NEAREST.
<a> key - toggle animation on/off
Escape Key - exit program
texenv.c
This program demonstrates the texture environment modes.
It reads in a texture from a .rgb(a) file, and
applies it as a texture to a rectangular polygon using explicit
texture coordinates.
The enironment modes can be changed interactively.
<c> Key - toggle polygon color between white/red
<e> key - cycle through environment modes
Escape key - exit the program
swim.c
This program demonstrates how the alpha values in a texture
can be combined with the texture environment to make textures
with tranparent areas.
alphaFunc and blending are used to make the parts of the
rectangle outside the fish image transparent wherever the
fish.rgba file has low alpha values.
<a> Key - toggle alpha test on/off
<b> Key - toggle blending on/off
<e> Key - cycle through texture environment modes
<s> Key - toggle swimming on/off
Escape key - exit the program
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