README file from "sgi_extensions" directory
~opengl2/examples/sgi_extensions README Copyright 1994-1996, Silicon Graphics, Inc. Technical Education Development All Rights Reserved. A collection of programs that exercise some of the GL extensions introduced in IRIX 5.3 and IRIX 6.2. These examples run on only a subset of SGI platforms. All of these programs check if the extension exists before trying it. NOTE: These programs have been #ifdef'ed so that they will compile on older release (prior to IRIX 5.3), but because these programs use extensions to the OpenGL standard, they will not run properly on releases that do not support these extensions. IRIX 5.3 or later is recommended. fog_func.c This program demonstrates using the fog_func extension to define a fog blending function. Escape key - exit the program <f> key - change the fog blend function UP Arrow Key - increase the fog density or end value DOWN Arrow Key - decrease the fog density or end value fog_offset.c This program demonstrates using fog offset to make a fogged object appear brighter. Escape key - exit the program <o> key - toggle fog offset <f> key - change the fog blend function UP Arrow Key - increase the fog density or end value DOWN Arrow Key - decrease the fog density or end value interlace.c This program demonstrates GL_SGIX_interlace. <i> key - toggle interlacing on/off LEFT Arrow Key - increase the X zoom value RIGHT Arrow Key - decrease the X zoom value UP Arrow Key - increase the Y zoom value DOWN Arrow Key - decrease the Y zoom value Escape key - exit the program multisample.c Uses the GL_SGIS_multisample extension to antialias a parametric grid on a nurb surface. Left Mousebutton - move eye position Middle Mousebutton - change twist angle Right Mousebutton - move up / down to zoom in / out Escape Key - exit the program m Key - toggle multisampling on / off p Key - toggle polygon offset on / off R Key - reset view point_parameters.c This program demonstrates GL_SGIS_point_parameters. It allows you to change various point attributes dynamically. <a/A> key - increase/decrease the 'a' coefficient <b/B> key - increase/decrease the 'b' coefficient <c/C> key - increase/decrease the 'c' coefficient <f/F> key - increase/decrease the fade threshold size <m/M> key - increase/decrease the minimum point size <x/X> key - increase/decrease the maximum point size Escape key - exit the program sharpen_texutre.c Uses the GL_SGIS_sharpen_texture extension to sharpen the edges of a simple texture image. Escape key - exit the program <s> key - cycle through sharpen filters sprite.c This program demonstrates GL_SGIX_sprite. <i> key - toggle xxxx on/off Escape key - exit the program
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