//------------------------------------------------------------------------------
// File: stars.c
// Author: George Bain
// Date: May 25, 1997
// Description: Star related routines
// Copyright (C) 1997 George Bain, All Rights Reserved
//------------------------------------------------------------------------------

//------------------------------------------------------------------------------
// I N C L U D E S
//------------------------------------------------------------------------------

#include <libps.h>	   // standard Sony library
#include "stars.h"
#include "gfx.h"


//------------------------------------------------------------------------------
// G L O B A L S
//------------------------------------------------------------------------------

particle_handler stars[NUM_STARS];       // the star particles
short velocity_one = 1,                  // velocities for stars
      velocity_two = 2, 
      velocity_three = 3;

 
//------------------------------------------------------------------------------
// Function: InitStars()
// Description: Initialize the stars
// Parameters: none
// Returns: void
// Notes: N/A
//------------------------------------------------------------------------------

void InitStars( void )
 {
    
	int index;

	for( index=0; index<NUM_STARS; index++ )
	   {

         stars[index].rect.x = rand()%SCREEN_WIDTH;
		 stars[index].rect.y = rand()%SCREEN_HEIGHT-25;
         stars[index].rect.attribute = 0x00000000;
		 stars[index].rect.w = 1;
		 stars[index].rect.h = 1;

		 switch( rand()%3 )
		    {
		      case 0:  // far
			    {
				  stars[index].plane = 1;
				  stars[index].rect.r = 42;  
				  stars[index].rect.g = 42;
				  stars[index].rect.b = 42;
				}break;
			  case 1:  // in middle
				{
                  stars[index].plane = 2;
				  stars[index].rect.r = 84;  
				  stars[index].rect.g = 84;
				  stars[index].rect.b = 84;
				}break;
			  case 2:  // close
				{
                  stars[index].plane = 3;
				  stars[index].rect.r = 126; 
				  stars[index].rect.g = 126;
				  stars[index].rect.b = 126;
				}break;
              default:break;
		    }// end switch

	   }// end for

	printf("Init stars complete\n");

 }// end InitStars




//------------------------------------------------------------------------------
// Function: MoveStars()
// Description: Move all the stars at random locations
// Parameters: none
// Returns: void
// Notes: N/A
//------------------------------------------------------------------------------

void MoveStars( void )
 {

	int index;

	for( index=0; index<NUM_STARS; index++ )
	   {

          switch( stars[index].plane )
		     {
		     case 1:
			   {
				  stars[index].rect.x -= velocity_one;
				  
			   }break;
			 case 2:
			   {
				  stars[index].rect.x -= velocity_two;
				  
			   }break;
			 case 3:
			   {
				  stars[index].rect.x -= velocity_three;
				  
			   }break;
			 default:break;

		     }// end switch

       if( stars[index].rect.x <= 0 )
		   stars[index].rect.x = (SCREEN_WIDTH + stars[index].rect.x);
	   
	   }// end for

 }// end MoveStars




//------------------------------------------------------------------------------
// Function: DrawStars()
// Description: Register stars into the OT
// Parameters: none
// Returns: void
// Notes: N/A
//------------------------------------------------------------------------------

void DrawStars( void )
 {

    int index;

	for( index=0; index<NUM_STARS; index++ ) 
	     GsSortBoxFill( &stars[index].rect, 
			            &world_ordering_table[output_buffer_index], 0 );
				  
 }// end DrawStars


//-----------------------------------EOF----------------------------------------