// ***********************************************************************************
// Program written by B. Swan - BURROWINGGERBIL@HOTMAIL.COM
// ***********************************************************************************

// ***********************************************************************************
// Preprocessor functions
// ***********************************************************************************

// **** headers **********************************************************************

#include "header.h"				        			  						// include standard libs

// **** create global variables, structures, headers and arrays **********************

static GsOT         OTable_Header[2];                 // Header files holding OTable info
static GsOT_TAG     OTable_Array[2][1<<OTABLE_LENGTH];
                                                      // Array to hold drawing order info
PACKET    Packet_Memory[2][MAX_PACKETS];            	// Memory to hold GPU packet data

u_long 		currentBuffer;															// Current drawing screen
short     FntOne;
u_long    ScreenDrawTiming;
u_long    GameRunning = 1;                          	// is game (?) running

short 		VBRet;																			// Sound data
short			BackChannel;																// Background music channel

u_long		Counter;
long			LevelX = 0;						  										// level position
long			LevelXReal = -400;
GsSPRITE	LevelBlocks[256];														// store level graphics
u_char		BlockData[256][2];													// block solidity and
																											// transparency information
u_char		LevelDATA[400][15];													// level data
u_short		LevelBackDATA[100][15];						  				// level background data
GsCELL		LevelCELL[64];							  							// level cell data
GsMAP			LevelMAP;								 										// level map data
GsBG			LevelBG;								  									// level bg data
u_long		LevelBGWork[4294];													// level bg working area

typedef		struct{
						u_long x, y;
						u_short r, g, b;
						u_short speed;
						} STAR;
STAR			Stars[50];

typedef		struct{
						short alive;
						u_long xreal, yreal;
						u_short x, y;
						u_short speed;
						u_short weapon, weaponlevel;
						u_short firestatus, firetimer, fireglow, firehaze;
						u_short timer;
						u_short lives;
						u_long score;
						u_char r, g, b;
						u_short invincible;
						} USER;
USER			Player[2];
GsSPRITE	PlayerShip[16];

typedef		struct{
						short type;
						short x, y;
						u_short w, h;
						short strength;
						short speedx, speedy;
						} BULLET;
BULLET		Bullets[2][NUMBER_OF_BULLETS];

GsSPRITE	Glows[15];
GsSPRITE	Comet;
GsSPRITE	Rock;
GsSPRITE  Worm[3];
GsSPRITE 	PowerUp;
GsSPRITE	Splash;

short			WormPos[NUMBER_OF_ENEMIES][100][4];

typedef		struct{
					short type;
					short x, y;
					long anim;
					short strength;
					short dx, dy;
					u_short r, g, b;
					u_short next, previous;
					short misc1, misc2, misc3, misc4;
					} ENEMY;
ENEMY			Enemies[(NUMBER_OF_ENEMIES + 2)];
u_short		TotalEnemies = 0;
u_short		LastEnemyPointer = 0;

typedef		struct{
					u_long position;
					short type;
					short x, y;
					short misc1, misc2;
					} TRIGGER;
TRIGGER		LevelTriggers[NUMBER_OF_TRIGGERS];
u_short		CurrentTrigger = 0;

double			SIN[360];
double			COS[360];

// **** subroutines ****************************************************************

#include "i_enemy.c"					    			  						// include functions
#include "i_misc.c"
#include "i_init.c"
#include "i_level.c"
#include "i_player.c"
#include "i_screen.c"
#include "i_tim.c"

// ***********************************************************************************
// Main function
// ***********************************************************************************

void main()
  {
  Initialise();

	BackChannel = PlayBackSound();

  while (GameRunning == 1)
    {
		Counter += 1;																			// Increment game counter

		RenderStart();																		// Define frame variables
		UpdatePlayers();																	// React to player input
    UpdateWorld();                                    // Update all the sprites
    RenderWorld();                                   	// draw the screen
    };

  ResetGraph(3);
  }

// ***********************************************************************************
// Update everything
// ***********************************************************************************

void UpdateWorld()
  {
	// update the world co-ordinates

	LevelXReal += 1;																		// scroll level
	LevelX = MAX((LevelXReal >> 1), 0);									// use shifted coordinates
  if (LevelX / 16 == 380) GameRunning = 0;

	// update all player bullets

	UpdatePlayerBullets();

	// create new enemies if necessary

	NewEnemies();

	// update all enemies

	UpdateEnemies();

	// update scenery

	AnimateScenery();
	}