CPSC 102 Computer Science II
(Advanced C Programming)
Assignment 2

Objectives:

Description:

1. Following the code pattern developed so far, namely functions to initialize, load, print, and access objects, write the following functions:

   void    camera_init(FILE*,camera_t**,int);
   void    camera_del(camera_t**);
   void    camera_load_attributes(FILE*, camera_t*);
   void    camera_print(camera_t*,FILE*);
   char*   camera_getname(camera_t*);
   	

2. Don't forget to include a pointer to the camera object in the model object struct, i.e.,

   typedef struct model_type
   {
     camera_t      *cam;
     list_t        *mats;
     list_t        *objs;
   } model_t;
   	

3. Your code should be such that the following main() routine works unaltered:

   int main(int argc, char *argv[])
   {
           model_t         *model;
           FILE            *model_file=NULL;
   
     if(argc != 2) {
       fprintf(stderr,"Usage: %s \n",argv[0]);
       exit(1);
     }
   
     // open model file
     if((model_file = fopen(argv[1],"r")) == NULL) {
        printf("Error opening input file: %s\n",argv[1]);
        return;
     }
   
     // create model
     model = model_init(model_file);
   
     // close file
     fclose(model_file);
   
     // verify that we have the model
     // (can implement either way, with FILE* or without)
   //model_print(model);
     model_print(model,stdout);
   
     // free up memory
     model_del(model);
   
     return(0);
   }
   	

4. Sample input:
   

   camera cam1
   {
      pixeldim 640 480
      worlddim 8   6
      viewpoint 4 3 6
   }
   
   material green
   {
      ambient 0 5 0
   }
   
   material yellow
   {
      ambient  5 4 0
      diffuse  4 4 0
     specular  1 1 1
   }
   
   plane leftwall
   {
      material green
      normal 3 0 1
      point  0 0 0
   }
   
   plane rightwall
   {
      material yellow
      normal -3 0 1
      point   8 0 0
   }
   
   material gray
   {
      ambient 2 2 2
   }
   
   plane floor
   {
      material gray
      normal 0 1 0
      point  0 -0.2 0
   }
   	

5. Sample output (note that the output order of objects differs from the input, this is ok):
   

   loaded cam1 
   loaded green 
   loaded yellow 
   loaded leftwall 
   loaded rightwall 
   loaded gray 
   loaded floor 
   camera cam1
   {
      pixeldim 640 480
      worlddim   8   6
      viewpoint 4 3 6
   }
   
   material green
   {
      ambient 0 5 0
   }
   
   material yellow
   {
      ambient 5 4 0
      diffuse 4 4 0
     specular 1 1 1
   }
   
   material gray
   {
      ambient 2 2 2
   }
   
   plane leftwall
   {
      material green
      normal 3 0 1
      point  0 0 0
   }
   
   plane rightwall
   {
      material yellow
      normal -3 0 1
      point  8 0 0
   }
   
   plane floor
   {
      material gray
      normal 0 1 0
      point  0 -0.2 0
   }
   	

What to hand in:

1. A README file containing
   1. Course id--section no
   2. Name
   3. Assignment description
   4. Brief solution description (e.g., program design, description of algorithm, etc., however appropriate).
   5. Lessons learned, identified interesting features of your program
   6. Any special usage instructions
2. Makefile
3. source code (.h headers and .c source)
4. object code (do a make clean before tar)

How to hand in: