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    ~opengl2/demos README

            Copyright 1991-96, Silicon Graphics, Inc.
            Technical Education Development
            All Rights Reserved.


	Addtional demonstration programs for the OpenGL Programming 2 class.
   

    blendCollage.c:
	Demonstrates how to use the GL_EXT_blend_color extensions
	to blend images that do not have an alpha channel.

	This program displays images at random positions in a window,
	and uses a constant blending function to blend the images.
	The blending factor can be changed interactively.
	An option allows the images to be zoomed by a randow zoom 
	factor. Up to MAX_IMAGES can be read.  To run, type:

	blendCollage <imageFile1.rgb> [<imageFile2.rgb>] ...

	Try "blendCollage /usr/demos/data/textures/*.rgb"

	LEFT Mousebutton, down  - randomly choose a new image 
	Up Arrow		- increase blend factor
	Down Arrow		- decrease blend factor
	<c> key			- clear window to background color
	SPACEBAR		- toggle fixed/random zoom
	Escape key		- exit the program


    earth.c
	Demonstrates the various texture environment modes with an RGB
	image.  It maps a texture onto a quadric sphere.  By default,
	it creates a texture from the earth.rgb image. A different image
	can be specified on the command line.

	The environment modes can be changed interactively.

	<e> Key		- cycle through environment modes
	<s> Key		- toggle earth rotation on/off
	<t> Key		- toggle texturing on/off
	Escape Key	- exit program


    oglextensions.c
	Prints the GL, GLU and GLX extensions supported by the server.
	The -display option can be used to specify the server.  If it
	is not specified on the command line, the local display is used.


    oversphere.c
	Demonstrates how to use the overlay plane with GLUT.  Press and 
	drag the mouse buttons to choose the position of a sphere
	before rendering it.

	Left Mouse Button	- position red spheres
	Middle Mouse Button	- position green spheres
	Right Mouse Button	- position blue spheres
	Escape key		- exit program


    panZoom.c:
	pans around on a subimage when the Left Mousebutton is dragged.
	Zooming can be controlled interactively.

	Left Mousebutton, down          - pan subimage
        <z> key			- zoom in on subimage
        <Z> key			- zoom out on subimage
	Escape key                      - exit the program


    pixmap.c: demonstrates rendering to a pixmap.

	NOTE: This program does not run on RealityEngine systems in 5.3.

        p key			- render to pixmap
        w key			- render to window
        c key			- copy pixmap to window
	Escape Key		- exit program


    glwstereo.c     
	A motif program which uses the GLw widget.  Uses quad-buffer
	stereo if a suitable visual can be found, otherwise tries to
	use the SGIFullScreenStereo extension.

	Right Mousebutton, down - popup menu


    subtexture.c:  reads in an rgb image and uses it to texture a
	polygon in the left half of the window.  It then uses the
	GL_EXT_subtexture extensions to replace the middle of the 
	image texture with an artificually created striped texture.
	The new texture is mapped to a polygon in the right half of
	the window.

	Escape key              - exit the program


    surfgrid.c
	Demonstrates polygon offset and multisampling extensions.
	Renders a torus with a grid outlining it.

	Control keys:
	p       toggle polygon offset
	m       toggle multisampling
	S       increase polygon offset factor
	s       decrease polygon offset factor
	B       increase polygon offset bias
	b       decrease polygon offset bias
	g       toggle grid drawing
	f       toggle smooth/flat shading
	n       toggle whether to use GL evaluators or GLU nurbs
	u       decr number of segments in U direction
	U       incr number of segments in U direction
	v       decr number of segments in V direction
	V       incr number of segments in V direction

	Escape key              - exit the program


    multiwin.c:  Create multiple windows display different views of 
	the same scene. 
		
        Left Mousebutton 	- move eyepoint in polarview window
        Middle Mousebutton	- change twist angle in polarview window
        Right Mousebutton	- zoom in/out in all windows
        <f> key			- toggle filled/wireframe cylinder
        <R> key			- reset viewpoint
        Escape key		- exit the program


    lens - Roam around a very large image using textures tiles.
 
	Demonstrates the use of subtexture and texture color table extensions.

	Up/Down arrow 		- zoom in/out
	<l> key			- cycle through texture lookup tables
	<w> key 		- cycle through warping effects
	Left mouse 		- drag image
	Middle/Right mouse 	- rotate image CCW/CW
	<h/?> key		- help
	Esc 			- quit

Source

• RGBAandCI.c
• abgr.c
• blendCollage.c
• earth.c
• glwstereo.c
• lens.c
• multiwin.c
• oglextensions.c
• oversphere.c
• panZoom.c
• pixmap.c
• subtexture.c
• surfgrid.c
• util.c
• util.h
• xwindow.c
• xwindow.h

Documentation

• README
• index.html

Data

• .m_demos

Images

• aztecNM.rgb
• earth.rgb
• pictures.rgb
• tree.rgba

Reference

• Makefile

Subdirectories

• Tutorials