//------------------------------------------------------------------------------
// File: game.c
// Author: George Bain,
// Date: May 7, 1997
// Description: Star Fighter PSX 
// Copyright (C) 1997 George Bain, All Rights Reserved
//------------------------------------------------------------------------------

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

#include <libps.h>	// standard Sony library
#include "gfx.h"
#include "pad.h"	
#include "game.h"
#include "enemy.h"
#include "explode.h"
#include "bossone.h"
#include "asteroid.h"

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

PACKET gpu_work_area[2][PACKETMAX2];     // GPU packet work area
extern u_long pad_status;                // keep track of buttons activated
volatile u_char *bb0, *bb1;              // joypad related


//------------------------------------------------------------------------------
// Function: StartGame()
// Description: The game loop which handles all game related routines
// Parameters: none
// Returns: void
// Notes: This needs much, much improvement with the case statements
//------------------------------------------------------------------------------

void StartGame( void )
 {
	
    pad_status = 0;
	game_info.game_over = 0;

	game_info.game_mode = MODE_STORY;
 
	GetPadBuf(&bb0, &bb1);		// controller reception buffer
	
	// start the game loop
	while( !game_info.game_over )
	   {

		  ControllerInput();  // get user input
         
		  switch( game_info.game_mode )
			 {
			  case MODE_TITLE:
				 {
				    // display title screen until user hits "triangle"
					if( pad_status & PADRdown )
					  {  
                        ResetGame();   
					  }
				 }break;
			  case MODE_STORY:
				 {
                   // display story screen until user hits "start"
				   if( pad_status & PADstart )
				     {
                       game_info.game_mode = MODE_TITLE;
				       game_info.level_mode = 0;
				     }
				 }break;
			  case MODE_GAME:
				 {
				   // does player have any more lives? 
				   if( game_info.player_lives <= 0 )
					   game_info.game_mode = MODE_GAME_OVER;
				   
                   // is the boss defeated?
				   if( game_info.boss_energy <= 0 )
				     {
					   boss_one.state = BOSS_DEAD;
					   //Kaboom();
					   game_info.boss_dead++;
					   game_info.game_mode = MODE_BONUS;
					 }
				  
				 }break;
			  case MODE_GAME_OVER:
				 {
				   // hit select to select a new game
				   if( pad_status & PADselect )
				     { 
                       game_info.game_mode = MODE_STORY;
				       game_info.level_mode = 0;
				     }
				   else
				     {
				       game_info.level_mode = 0;
                       game_info.game_mode = MODE_GAME_OVER;
					   boss_one.state = BOSS_DEACTIVE;
				     }
				   
				 }break;
			  case MODE_BONUS:
				 {
				   // display bonus screen until user hits "X"
				   if( pad_status & PADRdown )
				     {
					    if( game_info.boss_dead >= 2 )
				          {
					        game_info.game_mode = MODE_GAME_OVER;
                            game_info.level_mode =  0;
				          }
						else 
						  {
                            game_info.game_mode = MODE_GAME;
					        game_info.level_mode = LEVEL_TWO;
					        game_info.boss_energy = BOSS_ENERGY;
				            player.state = PLAYER_ALIVE;
					        boss_one.state = BOSS_DEAD;
					        game_info.money += game_info.bonus;
					        ResetRCnt(1); 
						  }
				     }// end if down
				   else 
				     {
				       game_info.level_mode = 0;
				       game_info.game_mode = MODE_BONUS;
					   boss_one.state = BOSS_DEACTIVE;
				     }
                  
				 }break;
			  
			 }// end switch

		 RefreshScreen();    // redraw the screen
		  
      }// end while loop

 }// end StartGame




//------------------------------------------------------------------------------
// Function: RefreshScreen()
// Description: Updates all the game objects and redraws the screen
// Parameters: none
// Returns: void
// Notes: Special thanx to Mario Perdue and his Walz game
//------------------------------------------------------------------------------

void RefreshScreen( void )
 {

	// get the active buffer
    output_buffer_index = GsGetActiveBuff();

    // sets drawing command storage address
    GsSetWorkBase( (PACKET*)gpu_work_area[output_buffer_index]);

    // initialises the ordering table
    GsClearOt( 0, 0, &world_ordering_table[output_buffer_index]);

    // move objects
    CheckPlayerLocation();
	MoveEnemyLeft();
	MoveEnemyRight();
	MoveBossOne();
	MovePowerUp();
	MoveMissiles();
	MoveRockets();
	
	if( game_info.level_mode == LEVEL_ONE )
	    MoveStars();

	// check for collision
	EnemyRightCollide();
	EnemyLeftCollide();
	PowerUpCollide();
	BossOneCollide();

    // control all objects
    ControlEnemy();
	ControlBossOne();
	ControlPowerUp();
	RocketPlayerCollision();

    // animate objects
	AnimateExplosions();
	    
	if( game_info.game_mode == MODE_TITLE )
		 DrawTitleScreen();

	if( game_info.game_mode == MODE_STORY )
		DrawStoryScreen();

	if( game_info.game_mode == MODE_BONUS )
	  {
		MoveStars(); 
		DrawBonus();
        DrawStars();
	  }
	
	if( game_info.game_mode == MODE_GAME_OVER )
	  {
		MoveStars(); 
		DrawGameOver();
        DrawStars();
	  }
	
    if( game_info.level_mode == LEVEL_ONE )
      {
		 UpdateStatus();
		 DrawExplosions();
		 DrawPlayer();
		 DrawEnemy();
		 DrawBossOne();
		 DrawRockets();
		 DrawPowerUp();
		 DrawMissiles();
		 DrawStatusScreen();
		 DrawStars();
		 DrawLifeBar();
		 DrawBorderBar();
	  }

	if( game_info.level_mode == LEVEL_TWO )
      {
		 Scroll();
		 UpdateStatus();
		 DrawExplosions();
		 DrawPlayer();
		 DrawEnemy();
		 DrawBossOne();
		 DrawRockets();
		 DrawPowerUp();
		 DrawMissiles();
		 DrawStatusScreen();
		 DrawLifeBar();
		 DrawCityScreen();
	  }
    
		
    // wait for all drawing to be completed
    DrawSync(0);

    // wait for vertical synchronisation
    VSync(0);    // 0: blocking until vertical synch occurs

    // swap double buffers, (changes the display buffer and drawing buffer)
    GsSwapDispBuff();

    // registers drawing clear command in OT (e.g. clear to black)
    GsSortClear( 0x0, 0x0, 0x0,
                 &world_ordering_table[output_buffer_index]);

	 // start execution of the drawing command registered in OT
    GsDrawOt( &world_ordering_table[output_buffer_index]);

 }// end RefreshScreen


 
 
//------------------------------------------------------------------------------
// Function: DrawBonus()
// Description: Draw points, bonus points and total points on screen
// Parameters: none
// Returns: void
// Notes: N/A
//------------------------------------------------------------------------------

void DrawBonus( void )
 {

	FntLoad(896,256);

	FntOpen(92,70,SCREEN_WIDTH,SCREEN_HEIGHT,0,512);
	FntPrint("Points = %d\n\n",game_info.money);
	FntPrint("Bonus Points = %d\n\n",game_info.bonus);
	FntPrint("Total Points = %d",game_info.money+game_info.bonus);
	FntFlush(-1);
	FntFlush(-1);

	player.state = PLAYER_DEAD;

}// end DrawBonus




//------------------------------------------------------------------------------
// Function: DrawGameOver()
// Description: Draw GAME OVER !
// Parameters: none
// Returns: void
// Notes: N/A
//------------------------------------------------------------------------------

void DrawGameOver( void )
 {

	FntLoad(896,256);

	FntOpen(92,85,SCREEN_WIDTH,SCREEN_HEIGHT,0,512);
	FntPrint("G A M E    O V E R\n\n");
		
	FntFlush(-1);
	FntFlush(-1);

 }// end DrawGameOver
    



//------------------------------------------------------------------------------
// Function: ResetGame()
// Description: Setup the game settings
// Parameters: none
// Returns: void
// Notes: N/A
//------------------------------------------------------------------------------

void ResetGame( void )
 {

   game_info.game_mode = MODE_GAME;          // set game mode
   game_info.level_mode = LEVEL_ONE;         // start at level one
   game_info.money = 0;                      // set money
   game_info.boss_dead = 0;                  // boss dead counter
   game_info.bonus = 2000;                   // bonus points
   game_info.player_energy = PLAYER_ENERGY;  // set energy level
   game_info.player_lives = PLAYER_LIVES;    // set players lives
   player.state = PLAYER_ALIVE;              // set player state
   game_info.boss_energy = BOSS_ENERGY;      // set boss energy
   boss_one.state = BOSS_DEAD;               // set boss state
   ResetRCnt(1);                             // reset the system timer

 }// end ResetGame
	



//------------------------------------------------------------------------------
// Function: Scroll()
// Description: Scroll the city to the left of the screen
// Parameters: none
// Returns: void
// Notes: N/A
//------------------------------------------------------------------------------

void Scroll( void )
 {
	
	game_info.scroll_counter -= 1;
	
	if( game_info.scroll_counter <= -SCREEN_WIDTH )
	    game_info.scroll_counter = 0;

 }// end Scroll

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