Using OpenGL in C

1
Using OpenGL in C

• by Joshua Shelfer

2
Setting It Up

• www.taoframework.com
• Install the Setup file
• Or
• Download the Zip file
• Open lib\win32deps and copy freeglut.dll
• Paste freeglut.dll into WINDOWS\System

3
Getting Started

• Open your .NET solution
• Click Project gt Add Reference
• If you installed, find the three Tao GL and GLUT
  files under .NET tab
• If not, find these dlls under the browse tab
  (located in the bin folder of the Zip file).
  Keep in mind, the dlls will have to be in the
  same directory as the Exe file in order for it to
  run.
• Tao.Freeglut.dll
• Tao.OpenGL.dll
• Tao.OpenGL.Glu.dll

4
Required Code

• Add these lines of code
• using Tao.FreeGlut
• using Tao.OpenGl

5
Example Code

• Main function
• Glut.glutInit()
• Glut.glutInitDisplayMode(Glut.GLUT_DOUBLE
  Glut.GLUT_RGB)
• Glut.glutInitWindowSize(INITIAL_WIDTH,
  INITIAL_HEIGHT)
• Glut.glutInitWindowPosition(0, 0)
• Glut.glutCreateWindow("Tic Tac Toe")
• Glut.glutDisplayFunc(tictactoe.display)
• Glut.glutMouseFunc(tictactoe.mouseHandler)
• Glut.glutMotionFunc(tictactoe.motionHandler)
• Glut.glutReshapeFunc(tictactoe.reshapeHandler)
• Init function
• Gl.glClearColor(1.0f, 1.0f, 1.0f, 1.0f)
• Gl.glColor3f(0.0f, 0.0f, 0.0f)
• Gl.glMatrixMode(Gl.GL_PROJECTION)
• Gl.glLoadIdentity()
• Glu.gluOrtho2D(0.0, 50.0, 0.0, 50.0)
• Gl.glMatrixMode(Gl.GL_MODELVIEW)

6
Pros and Cons

• Pros
• Inherent benefits of C
• OOP
• Easy to set up
• Cons
• Gl., Glut., And Glu. can be cumbersome to type
• User must have freeglut.dll in WINDOWS\System
  folder