/*
 * DMLib
 * -- Main header file
 * Programmed and designed by Matti 'ccr' Hamalainen
 * (C) Copyright 2011 Tecnic Software productions (TNSP)
 */
#ifndef DMLIB_H
#define DMLIB_H

#include <SDL_config.h>
#include <SDL_endian.h>
#include <SDL_types.h>
#include <SDL_mutex.h>
#include <SDL_video.h>
#include <stdarg.h>

#ifdef DM_USE_ASSERTS
#include <assert.h>
#else
#define assert(NEXPR) // stub
#endif

#ifdef __cplusplus
extern "C" {
#endif

// Defaults
//#define DM_PROG_AUTHOR      "By Matti 'ccr' Hmlinen (C) Copyright 2012 TNSP"
//#define DM_PROG_LICENSE     "This software is licensed under GNU GPL version 2"

#define DM_PROG_AUTHOR      ""
#define DM_PROG_LICENSE     ""

/* Error codes
 */
enum {
	// General error codes
	DMERR_OK = 0,
	DMERR_PROGRESS,     // Status OK, but operation in progress
	
	DMERR_FOPEN,
	DMERR_FREAD,
	DMERR_FWRITE,
	DMERR_FSEEK,
	DMERR_NOT_FOUND,    // Resource/data not found

	DMERR_INVALID_DATA, // Some data was invalid
	DMERR_MALLOC,       // Memory allocation failure
	DMERR_ALREADY_INIT, // Resource has already been initialized
	DMERR_INIT_FAIL,    // General initialization failure
	DMERR_INVALID_ARGS,

	DMERR_NULLPTR,      // NULL pointer specified in critical argument
	DMERR_NOT_SUPPORTED,// Operation not supported
	DMERR_OUT_OF_DATA,
	DMERR_EXTRA_DATA,
	DMERR_BOUNDS,

	// PACK-file subsystem
	DMERR_NOTPACK,
	DMERR_VERSION,
	DMERR_INVALID,
	DMERR_COMPRESSION,
};


// Resource management defines
#define DMRES_NAME_LEN  32
#define DMRES_DATA_PACK	"data.pak"  // Name of the data-file
#define DMRES_DATA_PATH	"DATA/"     // Sub-directory path
#define DMRES_RES_FILE  "res.txt"   // Resource data file


// Mutexes
#define DMMutex SDL_mutex
#define dmCreateMutex() SDL_CreateMutex()
#define dmDestroyMutex(x) SDL_DestroyMutex(x)
#define dmMutexLock(x) SDL_mutexP(x)
#define dmMutexUnlock(x) SDL_mutexV(x)


/* Define a boolean type
 */
#if !defined(FALSE) && !defined(TRUE) && !defined(BOOL)
typedef enum { FALSE = 0, TRUE = 1 } BOOL;
#endif

#ifndef BOOL
#ifdef bool
#define BOOL bool
#else
#define BOOL int
#endif
#endif


/* Fixed point math type
 */
typedef union
{
    Sint64 dw;
    Sint32 w[2];
} DMFixedPoint;


typedef union
{
    Sint32 dw;
    Sint16 w[2];
} DMFixedPoint32;


/* Macros for fixed point math
 */
#if __GNUC__ >= 3
#  define FP_SET(a, k) a.dw = k ## ULL
#else
#  define FP_SET(a, k) a.dw = k
#endif

#define FP_CONV(a, k) a.dw = (k)

#ifndef SDL_BYTEORDER
#  error Undefined byteorder!
#endif

#if (SDL_BYTEORDER == SDL_BIG_ENDIAN)
#  define FP_SETH(a, k) a.w[0] = (k)
#  define FP_SETL(a, k) a.w[1] = (k)
#  define FP_SETHL(a, h, l) { a.w[0] = (h); a.w[1] = (l); }
#  define FP_GETH(a) a.w[0]
#  define FP_GETL(a) a.w[1]
#elif (SDL_BYTEORDER == SDL_LIL_ENDIAN)
#  define FP_SETH(a, k) a.w[1] = (k)
#  define FP_SETL(a, k) a.w[0] = (k)
#  define FP_SETHL(a, h, l) { a.w[1] = (h); a.w[0] = (l); }
#  define FP_GETH(a) a.w[1]
#  define FP_GETL(a) a.w[0]
#else
#  error Unsupported byte order!
#endif

#define FP_PRINTF(a)   printf("%.8x:%.8x", FP_GETH(a), FP_GETL(a))
#define FP_PRINTF32(a) printf("%.4x:%.4x", FP_GETH(a), FP_GETL(a))

#define FP_ADD(a, b) a.dw += b.dw
#define FP_SUB(a, b) a.dw -= b.dw
#define FP_ADD_R(r, a, b) r.dw = a.dw + b.dw
#define FP_SUB_R(r, a, b) r.dw = a.dw - b.dw
#define FP_DIV(a, b) a.dw /= b.dw
#define FP_MUL(a, b) a.dw *= b.dw
#define FP_DIV_R(r, a, b) r.dw = (a.dw / b.dw)
#define FP_MUL_R(r, a, b) r.dw = (a.dw * b.dw)


/* Miscellaneous types
 */
typedef struct
{
#if (SDL_BYTEORDER == SDL_BIG_ENDIAN)
    Uint8 a,g,b,r;
#elif (SDL_BYTEORDER == SDL_LIL_ENDIAN)
    Uint8 r,g,b,a;
#endif
} DMRGBA32;


typedef float DMFloat;


// Macro for swapping two lvalues of same type
#define DM_SWAP(T, A, B) { if ((B) < (A)) { T swtmp = (B); B = (A); A = swtmp; } }


/* Drawing modes used by blitting and some other functions.
 */
enum
{
    DMD_NONE        = 0x0000,
    DMD_TRANSPARENT = 0x0001,
    DMD_SATURATE    = 0x0002,
 
    DMD_ANTIALIAS   = 0x0004,
    
    DMD_NMODES      = 6
};


// Available bitdepths. Not all functions may support every one of these.
enum
{
    DMD_8BIT = 0,
    DMD_32BIT,
    
    DMD_NBITDEPTHS
};


static inline int dmBitsPerPixel2Index(int bpp)
{
    return (bpp == 8 ? 0 : (bpp == 32 ? 1 : -1));
}


/* Generic parameter interpolation
 */
#define DMM_S_CURVE(t)     ((t) * (t) * (3.0f - 2.0f * (t)))
#define DMM_LERP(t, a, b)  ((a) + (t) * ((b) - (a)))

typedef struct
{
    DMFloat start, end, nsteps;
} DMLerpContext;


void       dmLerpInit(DMLerpContext *ctx, DMFloat start, DMFloat end, DMFloat nsteps);
DMFloat    dmCatmullRom(const DMFloat t, const DMFloat p0, const DMFloat p1, const DMFloat p2, const DMFloat p3);


static inline DMFloat dmClamp10(const DMFloat a)
{
    return (a < 0.0f ? 0.0f : (a > 1.0f ? 1.0f : a));
}


static inline int dmClamp(const int v, const int min, const int max)
{
    return (v < min ? min : (v > max ? max : v));
}


static inline DMFloat dmLerpSCurve(DMLerpContext *ctx, const DMFloat step)
{
    const DMFloat n = step / ctx->nsteps;
    const DMFloat v = DMM_S_CURVE(n);
    return DMM_LERP(v, ctx->start, ctx->end);
}


static inline DMFloat dmLerpSCurveClamp(DMLerpContext *ctx, const DMFloat step)
{
    const DMFloat n = dmClamp10(step / ctx->nsteps);
    const DMFloat v = DMM_S_CURVE(n);
    return DMM_LERP(v, ctx->start, ctx->end);
}


static inline DMFloat dmLerp1(DMLerpContext *ctx, const DMFloat step)
{
    const DMFloat v = step / ctx->nsteps;
    return DMM_LERP(v, ctx->start, ctx->end);
}


static inline DMFloat dmLerp1Clamp(DMLerpContext *ctx, const DMFloat step)
{
    const DMFloat v = dmClamp10(step / ctx->nsteps);
    return DMM_LERP(v, ctx->start, ctx->end);
}


static inline DMFloat dmCatmullRomClamp(const DMFloat t, const DMFloat p0, const DMFloat p1, const DMFloat p2, const DMFloat p3)
{
    return dmCatmullRom(dmClamp10(t), p0, p1, p2, p3);
}


/* Perlin noise
 */
void       dmPerlinInit(void);
DMFloat    dmPerlinNoise2D(DMFloat x, DMFloat y, DMFloat alpha, DMFloat beta, int n);


/* Arbitrary line drawing
 */
#ifdef DM_GFX_LINES
#define DM_HEADER
#include "dmlinefunc.h"

enum
{
    CLIP_TOP     = 1,
    CLIP_BOTTOM  = 2,
    CLIP_RIGHT   = 4,
    CLIP_LEFT    = 8
};

#define DM_CLIP_FUNC dmClipLineCoordsFloat
#define DM_COORD_TYPE DMFloat
#include "dmlineclip.h"

#undef DM_HEADER
#endif


/* Various blitting functions
 */
#ifdef DM_GFX_BLITS
typedef int (*DMScaledBlitFunc)(SDL_Surface *src, const int x0, const int y0, const int dwidth, const int dheight, SDL_Surface *dst);
DMScaledBlitFunc dmGetScaledBlitFunc(SDL_PixelFormat *src, SDL_PixelFormat *dst, int mode);
int dmScaledBlitSurfaceAny(SDL_Surface *src, const int x0, const int y0, const int dwidth, const int dheight, SDL_Surface *dst, int mode);

typedef int (*DMUnscaledBlitFunc)(SDL_Surface *src, const int x0, const int y0, SDL_Surface *dst);
DMUnscaledBlitFunc dmGetUnscaledBlitFunc(SDL_PixelFormat *src, SDL_PixelFormat *dst, int mode);
int dmUnscaledBlitSurfaceAny(SDL_Surface *src, const int x0, const int y0, SDL_Surface *dst, int mode);

#define DM_HEADER
#include "dmblitfunc.h"
#undef DM_HEADER
#endif


/* Misc functions
 */
#ifdef DM_GFX_MISC
void       dmFillRect(SDL_Surface *screen, int x0, int y0, int x1, int y1, const Uint32 col);
void       dmDrawHLine(SDL_Surface *screen, int x0, int x1, int yc, const Uint32 col);
void       dmDrawVLine(SDL_Surface *screen, int y0, int y1, int xc, const Uint32 col);

void       dmDrawBox3D(SDL_Surface *screen, int x0, int y0, int x1, int y1, Uint32 ucol, Uint32 dcol);
void       dmFillBox3D(SDL_Surface *screen, int x0, int y0, int x1, int y1, Uint32 bgcol, Uint32 ucol, Uint32 dcol);


static inline void dmClearSurface(SDL_Surface *screen, const Uint32 col)
{
    SDL_FillRect(screen, NULL, col);
}


static inline Uint32 dmMapRGB(SDL_Surface *screen, int r, int g, int b)
{
    return SDL_MapRGB(screen->format, r, g, b);
}


static inline Uint32 dmMapRGBA(SDL_Surface *screen, int r, int g, int b, int a)
{
    return SDL_MapRGBA(screen->format, r, g, b, a);
}


static inline int dmDirectBlitSurface(SDL_Surface *bmp, SDL_Surface *screen)
{
    return SDL_BlitSurface(bmp, NULL, screen, NULL);
}
#endif


/* Global variables
 */
extern char *dmProgName,
            *dmProgDesc,
            *dmProgVersion,
            *dmProgAuthor,
            *dmProgLicense;

extern int dmVerbosity;
void       dmInitProg(char *name, char *desc, char *version, char *author, char *license);
void       dmPrintBanner(FILE *outFile, const char *name, const char *usage);

void       dmMsgVA(int level, const char *fmt, va_list ap);
void       dmMsg(int level, const char *fmt, ...);
void       dmPrintVA(int level, const char *fmt, va_list ap);
void       dmPrint(int level, const char *fmt, ...);
void       dmErrorVA(const char *fmt, va_list);
void       dmError(const char *fmt, ...);

void *     dmMalloc(size_t);
void *     dmMalloc0(size_t);
void *     dmRealloc(void *, size_t);
void *     dmCalloc(size_t, size_t);
void       dmFree(void *);

BOOL dmGetIntVal(const char *s, int *i);

int         dmGetErrno();
const char *dmErrorStr(int error);

char *     dm_strdup(const char *);
char *     dm_strdup_vprintf(const char *, va_list);
char *     dm_strdup_printf(const char *, ...);


/* Endianess swapping macros
 */
#define DM_SWAP_16_LE_BE(value)    ((Uint16) (   \
    (Uint16) ((Uint16) (value) >> 8) |      \
    (Uint16) ((Uint16) (value) << 8)) )


#define DM_SWAP_32_LE_BE(value) ((Uint32) (               \
    (((Uint32) (value) & (Uint32) 0x000000ffU) << 24) | \
    (((Uint32) (value) & (Uint32) 0x0000ff00U) <<  8) | \
    (((Uint32) (value) & (Uint32) 0x00ff0000U) >>  8) | \
    (((Uint32) (value) & (Uint32) 0xff000000U) >> 24)))

#ifdef DM_HAVE_64BIT
#define DM_SWAP_64_LE_BE(value) ((Uint64) (                           \
    (((Uint64) (value) & (Uint64) 0x00000000000000ffULL) << 56) |   \
    (((Uint64) (value) & (Uint64) 0x000000000000ff00ULL) << 40) |   \
    (((Uint64) (value) & (Uint64) 0x0000000000ff0000ULL) << 24) |   \
    (((Uint64) (value) & (Uint64) 0x00000000ff000000ULL) <<  8) |   \
    (((Uint64) (value) & (Uint64) 0x000000ff00000000ULL) >>  8) |   \
    (((Uint64) (value) & (Uint64) 0x0000ff0000000000ULL) >> 24) |   \
    (((Uint64) (value) & (Uint64) 0x00ff000000000000ULL) >> 40) |   \
    (((Uint64) (value) & (Uint64) 0xff00000000000000ULL) >> 56)))
#endif

/* Macros that swap only when needed ...
 */
#if (SDL_BYTEORDER == SDL_BIG_ENDIAN)
#    define DM_LE16_TO_NATIVE(value) DM_SWAP_16_LE_BE(value)
#    define DM_LE32_TO_NATIVE(value) DM_SWAP_32_LE_BE(value)
#    define DM_NATIVE_TO_LE16(value) DM_SWAP_16_LE_BE(value)
#    define DM_NATIVE_TO_LE32(value) DM_SWAP_32_LE_BE(value)

#    define DM_BE16_TO_NATIVE(value) ((Uint16) (value))
#    define DM_BE32_TO_NATIVE(value) ((Uint32) (value))
#    define DM_NATIVE_TO_BE16(value) ((Uint16) (value))
#    define DM_NATIVE_TO_BE32(value) ((Uint32) (value))

#    ifdef DM_HAVE_64BIT
#        define DM_LE64_TO_NATIVE(value) DM_SWAP_64_LE_BE(value)
#        define DM_NATIVE_TO_LE64(value) DM_SWAP_64_LE_BE(value)
#        define DM_BE64_TO_NATIVE(value) ((Uint64) (value))
#        define DM_NATIVE_TO_BE64(value) ((Uint64) (value))
#    endif

#elif (SDL_BYTEORDER == SDL_LIL_ENDIAN)

#    define DM_LE16_TO_NATIVE(value) ((Uint16) (value))
#    define DM_LE32_TO_NATIVE(value) ((Uint32) (value))
#    define DM_NATIVE_TO_LE16(value) ((Uint16) (value))
#    define DM_NATIVE_TO_LE32(value) ((Uint32) (value))

#    define DM_BE16_TO_NATIVE(value) DM_SWAP_16_LE_BE(value)
#    define DM_BE32_TO_NATIVE(value) DM_SWAP_32_LE_BE(value)
#    define DM_NATIVE_TO_BE16(value) DM_SWAP_16_LE_BE(value)
#    define DM_NATIVE_TO_BE32(value) DM_SWAP_32_LE_BE(value)

#    ifdef DM_HAVE_64BIT
#        define DM_LE64_TO_NATIVE(value) ((Uint64) (value))
#        define DM_NATIVE_TO_LE64(value) ((Uint64) (value))
#        define DM_BE64_TO_NATIVE(value) DM_SWAP_64_LE_BE(value)
#        define DM_NATIVE_TO_BE64(value) DM_SWAP_64_LE_BE(value)
#    endif
#endif


#ifdef __cplusplus
}
#endif
#endif // DMLIB_H