Gigapixel

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Gigapixel YouAnd OpenGL Too!

• 28 September 2005
• CS 5764
• John Booker

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Gigapixel Technologies DMX

• No, not that DMX
• Distributed Multihead X
• http//dmx.sourceforge.net/
• Combines multiple displays across cluster into
  one display
• Makes any X Windows application run on the 24
  tiled array
• But its slow, the rendering isnt REALLY
  distributed

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Technology Chromium

• http//chromium.sourceforge.net/
• Distributed Rendering for OpenGL
• Unfortunately not a lot of vis toolkits for
  OpenGL (PLEASE, correct me if Im wrong)

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OpenGL Where to start

• Download GL/GLUT
• Already setup on Gigapixel, do it for home too
• Set up Visual Studio Project/Makefile
• Windows
• http//csf11.acs.uwosh.edu/cs371/visualstudio/
• Others
• http//www.opengl.org/resources/faq/getting_starte
  d.html

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OpenGL Code Structure

• int main(int argc, char argv)
• /SETUP/
• glutInit(argc, argv)
• glutInitDisplayMode (GLUT_SINGLE GLUT_RGB)
• glutInitWindowSize (250, 250)
• glutInitWindowPosition (100, 100)
• glutCreateWindow ("hello")
• init ()
• /Define Where Your Code is/
• glutDisplayFunc(display)
• /Go For It!/
• glutMainLoop()
• return 0

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OpenGL Drawing Graphics

• void display(void) /You set this up in
  main()/
• glClear (GL_COLOR_BUFFER_BIT)
• glColor3f (1.0, 1.0, 1.0)
• /Draw a Primitive/
• glBegin(GL_POLYGON)
• glVertex3f (0.25, 0.25, 0.0)
• glVertex3f (0.75, 0.25, 0.0)
• glVertex3f (0.75, 0.75, 0.0)
• glVertex3f (0.25, 0.75, 0.0)
• glEnd()

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Congratulations, you drew a square!
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OpenGL Utility Toolkit (GLUT)

• Utility library to
• Define/control windows
• Monitor keyboard/mouse input
• popup menus

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GLUT Menus

• glutAddMenuEntry()

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GLUT Mouse

• glutMouseFunc(mouseFunk)
• mouseFunk(int button, int state, int x, int y )
• Process (x,y) manually to determine where clicks
  happened
• -OR-
• Figure out the picking example code here
• http//www.opengl.org/resources/code/basics/redboo
  k/pickdepth.c

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OpenGL Fonts

• Not natively supported by OpenGL, but many
  options
• http//www.opengl.org/resources/features/fontsurve
  y/

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GL User Interface - GLUI

• Can combine graphics with UI
• http//www.cs.unc.edu/rademach/glui/download

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Programming at home

• Think big!

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Programming at home

• Not small!

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Design Think about size!
Is your home screen a portion of the large
display?
Or is it an overview?
Gigapixel is 8 x 3 monitors _at_ 1280x1024 10240x3
072 total
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Other Design Considerations

• Notifications in the periphery
• Periphery of gigapixel is well outside
  the periphery of vision

Be careful about positioning in general!
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Links

• OpenGL
• http//www.opengl.org/
• http//www.opengl.org/resources/faq/getting_starte
  d.html
• Toolkits
• GLUI http//www.cs.unc.edu/rademach/glui/
• GLUT http//www.opengl.org/resources/libraries/glu
  t.html
• Fonts http//www.opengl.org/resources/features/fon
  tsurvey/
• Chromium
• http//chromium.sourceforge.net/
• DMX
• http//dmx.sourceforge.net/
• Gigapixel
• http//infovis.cs.vt.edu/gigapixel/ (more stuff
  will be here soon)