Notes for Homework 1

• Descriptions of PPM files, available here and here.
• Example PPM files: plank.ppm, woodtex.ppm, and woodtex2.ppm
• I suggest for problem 2, your function should work similar to one of the following schemes:
  1. int WritePPM( char *filename, int imgWidth, int imgHeight, unsigned char *imageToSave );
     • None of the inputs should be changed by WritePPM(). (You could use const if you want.)
     • filename would be the name of the file you create.
     • imgWidth and imgHeight describe the size of the image you are going to output.
     • inputImage is a pointer to an array containing your image (with size: 3*imgWidth*imgHeight*sizeof(unsigned char))
     • I would return a value describing success/failure of the function.
  2. int WritePPM( char *filename, Image *imageToSave ); (or more likely: int Image::WritePPM( char *filename );)
     • Here, Image is a class that encapsulates information about an image (e.g., size, internal format, data, etc.).
• A GLUT template program I use [as a .tar.gz file] or [as a .zip file]
  • NOTE: This is not exactly what's needed for this assignment.
  • Useful for checking you've got your environment set correctly to compile and run OpenGL programs.

Chris Wyman (cwyman@cs.uiowa.edu)