//------------------------------------------------------------------------------
// File: explode.c
// Author: George Bain
// Date: May 25, 1997
// Description: Explosion 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 "explode.h"
#include "gfx.h"


//------------------------------------------------------------------------------
// Function: DrawExplosions()
// Description: Register explosion sprites into the OT
// Parameters: none
// Returns: void
// Notes: N/A
//------------------------------------------------------------------------------

void DrawExplosions( void )
 {

	int count;

	for( count=0; count<NUM_EXPLOSIONS; count++ ) 
	   {
		 
		  if( explosion[count].state == EXPLOSION_ALIVE )
			  GsSortFastSprite( &explosion[count].sprite, 
			                    &world_ordering_table[output_buffer_index], 0 );
       
	   }// end for
 
 }// end DrawExplosions




//------------------------------------------------------------------------------
// Function: AnimateExplosions()
// Description: If explostion is ALIVE animate the sprite
// Parameters: none
// Returns: void
// Notes: N/A
//------------------------------------------------------------------------------

void AnimateExplosions( void )
 {  

    int count;
	
	for( count=0; count<NUM_EXPLOSIONS; count++ )  
	   {

	     if( explosion[count].state == EXPLOSION_ALIVE )  
	       {
	         // check if time to change a frame
	         if( (++explosion[count].anim_clock) == 
				 (explosion[count].anim_speed) )
		       {

		         // check if the animation is done
                 if( ++explosion[count].curr_frame == 6 )
			         explosion[count].state = EXPLOSION_DEAD;
                  
		         explosion[count].anim_clock = 0;  // reset

			   }// end if time to change frames

		   }// end if ALIVE

	   }// end for

 }// end AnimateExplosions




//------------------------------------------------------------------------------
// Function: StartExplosions()
// Description: Set up the fields of the explosion sprite
// Parameters: x: x location
//             y: y location
//             speed: animation speed of frames 
// Returns: void
// Notes: N/A
//------------------------------------------------------------------------------

void StartExplosions( int x, int y, int speed )
 { 
	
    int count;
	
	for( count=0; count<NUM_EXPLOSIONS; count++ )
	   {
		   
		  if( explosion[count].state == EXPLOSION_DEAD )
		    {
			   explosion[count].state = EXPLOSION_ALIVE;
			   explosion[count].sprite.x = x-10;
			   explosion[count].sprite.y = y-10;
			   explosion[count].curr_frame = 0;
		       explosion[count].anim_speed = speed;
		       explosion[count].anim_clock = 0;
           
			   break;
		    }// end if dead
	     
	   }// end for

 }// end StartExplosions

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