#ifndef _FRAK_H_
#define _FRAK_H_ 1

#include <dirent.h>
#include <GL/glut.h>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>


#define PIXMAP_WIDTH 640 /* default pixmap size */
#define PIXMAP_HEIGHT 480

#define PREVIEW_SCALE 0.33 /* preview pixmap will smaller than the main one by 1/PREVIEW_SCALE */

#define DEFAULT_MAXITER	100 /* default iteration limit */

#define SCROLLING_STEP 0.1 /* scrolling step - proportion of screen */
#define SCALE_STEP 2 /* scale step */

#define DEFAULT_SCALE_MANDELBROT 0.75
#define DEFAULT_SCALE 0.375  /* canonical view - scale */
#define DEFAULT_CENTERX -0.5 /* canonical view - home coordinates */
#define DEFAULT_CENTERY 0    /* --||-- */

#define PALETTE_SIZE 256

#define SCREENSHOT_FILENAME_SIZE 255
#define SCREENSHOT_EXT ".tga"
#define WINDOW_TITLE "Frak"

typedef struct {
	unsigned int width;
	unsigned int height;
	unsigned char * pixels;
} pixmap;

	   /* ------------------------- ------------------------- */ 

extern pixmap * pixMain; /* big pixmap for Mandelbrot or Julia set  */
extern pixmap * pixPreview; /* small pixmap for Julia preview mode
	(maybe also for orbits mode in future...) */

extern unsigned char needsRecalcMain; /* pixMain needs to be recalculated */
extern unsigned char needsRecalcPreview; /* pixPreview needs to be recalculated */
extern unsigned char needsCompleteRecalcMain; /* force recalc, even when pixmap can be moved */
extern unsigned char enablePixmove; /* enable pixmove optimization */
extern unsigned char juliaPreviewMode; /* small preview of Julia set */
extern unsigned char juliaMode; /* Julia set instead of Mandelbrot set */
extern unsigned char calculatingMain; /* pixMain is being calculated - keys must wait */

extern unsigned int  maxiter;

/* center of current scene - complex coordinates */
extern double centerx, centery;
extern double scale;
/* previous scene parameters - used by the pixmove optimization */
extern double prevcenterx, prevcentery;
extern double prevscale;

extern double jx, jy; /* Julia parameters */

extern unsigned int width, height; /* pixMain/window width & height */

extern unsigned char mousedown;

extern unsigned char palette[PALETTE_SIZE][3]; /* pallete - dynamicly generate */

extern char screenshotFile[];
extern char screenshotExt[];
extern char screenshotPrefix[];

      /* ------------------------- FUNCTIONS ------------------------- */ 

void generatePalette(void);
void colorize(const int iter, const int maxiter, const double zx, const double zy,
		unsigned char *r, unsigned char *g, unsigned char *b);
void calcMandelbrotSet(pixmap *p, double centerx, double centery, double scale,
		int maxiter, int fromx, int fromy, int tox, int toy);
void calcJuliaSet(pixmap *p, double centerx, double centery, double scale,
		int maxiter, double jx, double jy);
void calc(void);

int filenameFilter(const struct dirent *filename);
void nextFileNumber (char * filename);
void onExit(void);
void onInit(void);
void onResize(int w, int h);
void onDisplay(void);
void onKeyboard(unsigned char key, int x, int y);
void onKeyboardSpecial(int key, int x, int y);
void onMouse(int button, int state, int x, int y);
void onMouseMotion(int x, int y);

pixmap * createPixmap(int width, int height);
void deletePixmap(pixmap *p);
void clearPixmap(pixmap *p);
void putpixel(pixmap *p, const unsigned int x, const unsigned int y,
		const unsigned char r, const unsigned char g, const unsigned char b);
void drawPixmap(const pixmap *p, const int xoff, const int yoff);
int savePixmapTGA(const pixmap *p, const char * fileName);
int pixmove(const pixmap * p, int xoff, int yoff);
void pixmapInit(void);

#endif /* _FRAK_H_*/