/*
** Haaf's Game Engine 1.7
** Copyright (C) 2003-2007, Relish Games
** hge.relishgames.com
**
** System layer API
*/


#ifndef HGE_H
#define HGE_H


#include <windows.h>

#define HGE_VERSION 0x170

#ifdef HGEDLL
#define EXPORT  __declspec(dllexport)
#else
#define EXPORT
#endif

#define CALL  __stdcall

#ifdef __BORLANDC__
 #define floorf (float)floor
 #define sqrtf (float)sqrt
 #define acosf (float)acos
 #define atan2f (float)atan2
 #define cosf (float)cos
 #define sinf (float)sin
 #define powf (float)pow
 #define fabsf (float)fabs

 #define min(x,y) ((x) < (y)) ? (x) : (y)
 #define max(x,y) ((x) > (y)) ? (x) : (y)
#endif


/*
** Common data types
*/
#ifndef DWORD
typedef unsigned long       DWORD;
typedef unsigned short      WORD;
typedef unsigned char       BYTE;
#endif


/*
** Common math constants
*/
#ifndef M_PI
#define M_PI	3.14159265358979323846f
#define M_PI_2	1.57079632679489661923f
#define M_PI_4	0.785398163397448309616f
#define M_1_PI	0.318309886183790671538f
#define M_2_PI	0.636619772367581343076f
#endif


/*
** HGE Handle types
*/
typedef DWORD HTEXTURE;
typedef DWORD HTARGET;
typedef DWORD HEFFECT;
typedef DWORD HMUSIC;
typedef DWORD HSTREAM;
typedef DWORD HCHANNEL;


/*
** Hardware color macros
*/
#define ARGB(a,r,g,b)	((DWORD(a)<<24) + (DWORD(r)<<16) + (DWORD(g)<<8) + DWORD(b))
#define GETA(col)		((col)>>24)
#define GETR(col)		(((col)>>16) & 0xFF)
#define GETG(col)		(((col)>>8) & 0xFF)
#define GETB(col)		((col) & 0xFF)
#define SETA(col,a)		(((col) & 0x00FFFFFF) + (DWORD(a)<<24))
#define SETR(col,r)		(((col) & 0xFF00FFFF) + (DWORD(r)<<16))
#define SETG(col,g)		(((col) & 0xFFFF00FF) + (DWORD(g)<<8))
#define SETB(col,b)		(((col) & 0xFFFFFF00) + DWORD(b))


/*
** HGE Blending constants
*/
#define	BLEND_COLORADD		1
#define	BLEND_COLORMUL		0
#define	BLEND_ALPHABLEND	2
#define	BLEND_ALPHAADD		0
#define	BLEND_ZWRITE		4
#define	BLEND_NOZWRITE		0

#define BLEND_DEFAULT		(BLEND_COLORMUL | BLEND_ALPHABLEND | BLEND_NOZWRITE)
#define BLEND_DEFAULT_Z		(BLEND_COLORMUL | BLEND_ALPHABLEND | BLEND_ZWRITE)


/*
** HGE System state constants
*/
enum hgeBoolState
{
	HGE_WINDOWED		= 12,   // bool		run in window?		(default: false)
	HGE_ZBUFFER			= 13,   // bool		use z-buffer?		(default: false)
	HGE_TEXTUREFILTER	= 28,   // bool		texture filtering?	(default: true)
	
	HGE_USESOUND		= 18,   // bool		use BASS for sound?	(default: true)
	
	HGE_DONTSUSPEND		= 24,	// bool		focus lost:suspend?	(default: false)
	HGE_HIDEMOUSE		= 25,	// bool		hide system cursor?	(default: true)

	HGE_SHOWSPLASH		= 27,	// bool		hide system cursor?	(default: true)

	HGEBOOLSTATE_FORCE_DWORD = 0x7FFFFFFF
};

enum hgeFuncState
{
	HGE_FRAMEFUNC		= 1,    // bool*()	frame function		(default: NULL) (you MUST set this)
	HGE_RENDERFUNC		= 2,    // bool*()	render function		(default: NULL)
	HGE_FOCUSLOSTFUNC	= 3,    // bool*()	focus lost function	(default: NULL)
	HGE_FOCUSGAINFUNC	= 4,    // bool*()	focus gain function	(default: NULL)
	HGE_GFXRESTOREFUNC	= 5,    // bool*()	exit function		(default: NULL)
	HGE_EXITFUNC		= 6,    // bool*()	exit function		(default: NULL)
	
	HGEFUNCSTATE_FORCE_DWORD = 0x7FFFFFFF
};

enum hgeHwndState
{
	HGE_HWND			= 26,	// int		window handle: read only
	HGE_HWNDPARENT		= 27,	// int		parent win handle	(default: 0)
	
	HGEHWNDSTATE_FORCE_DWORD = 0x7FFFFFFF
};

enum hgeIntState
{
	HGE_SCREENWIDTH		= 9,    // int		screen width		(default: 800)
	HGE_SCREENHEIGHT	= 10,   // int		screen height		(default: 600)
	HGE_SCREENBPP		= 11,   // int		screen bitdepth		(default: 32) (desktop bpp in windowed mode)
	
	HGE_SAMPLERATE		= 19,   // int		sample rate			(default: 44100)
	HGE_FXVOLUME		= 20,   // int		global fx volume	(default: 100)
	HGE_MUSVOLUME		= 21,   // int		global music volume	(default: 100)
	
	HGE_FPS				= 23,	// int		fixed fps			(default: HGEFPS_UNLIMITED)
	
	HGEINTSTATE_FORCE_DWORD = 0x7FFFFFF
};

enum hgeStringState
{
	HGE_ICON			= 7,    // char*	icon resource		(default: NULL)
	HGE_TITLE			= 8,    // char*	window title		(default: "HGE")
	
	HGE_INIFILE			= 15,   // char*	ini file			(default: NULL) (meaning no file)
	HGE_LOGFILE			= 16,   // char*	log file			(default: NULL) (meaning no file)

	HGESTRINGSTATE_FORCE_DWORD = 0x7FFFFFFF
};

/*
** Callback protoype used by HGE
*/
typedef bool (*hgeCallback)();


/*
** HGE_FPS system state special constants
*/
#define HGEFPS_UNLIMITED	0
#define HGEFPS_VSYNC		-1


/*
** HGE Primitive type constants
*/
#define HGEPRIM_LINES		2
#define HGEPRIM_TRIPLES		3
#define HGEPRIM_QUADS		4


/*
** HGE Vertex structure
*/
struct hgeVertex
{
	float			x, y;		// screen position    
	float			z;			// Z-buffer depth 0..1
	DWORD			col;		// color
	float			tx, ty;		// texture coordinates
};


/*
** HGE Triple structure
*/
struct hgeTriple
{
	hgeVertex		v[3];
	HTEXTURE		tex;
	int				blend;
};


/*
** HGE Quad structure
*/
struct hgeQuad
{
	hgeVertex		v[4];
	HTEXTURE		tex;
	int				blend;
};


/*
** HGE Input Event structure
*/
struct hgeInputEvent
{
	int		type;			// event type
	int		key;			// key code
	int		flags;			// event flags
	int		chr;			// character code
	int		wheel;			// wheel shift
	float	x;				// mouse cursor x-coordinate
	float	y;				// mouse cursor y-coordinate
};


/*
** HGE Input Event type constants
*/
#define INPUT_KEYDOWN		1
#define INPUT_KEYUP			2
#define INPUT_MBUTTONDOWN	3
#define INPUT_MBUTTONUP		4
#define INPUT_MOUSEMOVE		5
#define INPUT_MOUSEWHEEL	6


/*
** HGE Input Event flags
*/
#define HGEINP_SHIFT		1
#define HGEINP_CTRL			2
#define HGEINP_ALT			4
#define HGEINP_CAPSLOCK		8
#define HGEINP_SCROLLLOCK	16
#define HGEINP_NUMLOCK		32
#define HGEINP_REPEAT		64


/*
** HGE Interface class