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/* $Id$ */

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#ifndef MACROS_H

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#define MACROS_H

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#include "map.h"

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/// Fetch n bits starting at bit s from x

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#define GB(x, s, n) (((x) >> (s)) & ((1U << (n)) - 1))

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/// Set n bits starting at bit s in x to d

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#define SB(x, s, n, d) ((x) = ((x) & ~(((1U << (n)) - 1) << (s))) | ((d) << (s)))

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/// Add i to the n bits starting at bit s in x

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#define AB(x, s, n, i) ((x) = ((x) & ~(((1U << (n)) - 1) << (s))) | (((x) + ((i) << (s))) & (((1U << (n)) - 1) << (s))))

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#ifdef min

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#undef min

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#endif

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#ifdef max

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#undef max

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#endif

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static inline int min(int a, int b) { if (a <= b) return a; return b; }

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static inline int max(int a, int b) { if (a >= b) return a; return b; }

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static inline int64 max64(int64 a, int64 b) { if (a >= b) return a; return b; }

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static inline uint minu(uint a, uint b) { if (a <= b) return a; return b; }

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static inline uint maxu(uint a, uint b) { if (a >= b) return a; return b; }

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static inline int clamp(int a, int min, int max)

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{

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	if (a <= min) return min;

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	if (a >= max) return max;

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	return a;

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}

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static inline int32 BIGMULSS(int32 a, int32 b, int shift) {

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	return (int32)(((int64)(a) * (int64)(b)) >> (shift));

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}

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static inline int64 BIGMULSS64(int64 a, int64 b, int shift) {

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	return ((a) * (b)) >> (shift);

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}

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static inline uint32 BIGMULUS(uint32 a, uint32 b, int shift) {

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	return (uint32)(((uint64)(a) * (uint64)(b)) >> (shift));

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}

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static inline int64 BIGMULS(int32 a, int32 b) {

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	return (int32)(((int64)(a) * (int64)(b)));

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}

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/* OPT: optimized into an unsigned comparison */

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//#define IS_INSIDE_1D(x, base, size) ((x) >= (base) && (x) < (base) + (size))

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#define IS_INSIDE_1D(x, base, size) ( (uint)((x) - (base)) < ((uint)(size)) )

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#define HASBIT(x,y)    ((x) &   (1 << (y)))

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#define SETBIT(x,y)    ((x) |=  (1 << (y)))

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#define CLRBIT(x,y)    ((x) &= ~(1 << (y)))

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#define TOGGLEBIT(x,y) ((x) ^=  (1 << (y)))

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// checking more bits. Maybe unneccessary, but easy to use

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#define HASBITS(x,y) ((x) & (y))

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#define SETBITS(x,y) ((x) |= (y))

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#define CLRBITS(x,y) ((x) &= ~(y))

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#define PLAYER_SPRITE_COLOR(owner) ( (_player_colors[owner] + 0x307) << PALETTE_SPRITE_START)

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#define SPRITE_PALETTE(x) ((x) | PALETTE_MODIFIER_COLOR)

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extern const byte _ffb_64[128];

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/* Returns the position of the first bit that is not zero, counted from the

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 * left. Ie, 10110100 returns 2, 00000001 returns 0, etc. When x == 0 returns

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 * 0.

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 */

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#define FIND_FIRST_BIT(x) _ffb_64[(x)]

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/* Returns x with the first bit that is not zero, counted from the left, set

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 * to zero. So, 10110100 returns 10110000, 00000001 returns 00000000, etc.

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 */

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#define KILL_FIRST_BIT(x) _ffb_64[(x)+64]

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static inline int FindFirstBit2x64(int value)

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{

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/*

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	int i = 0;

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	if ( (byte) value == 0) {

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		i += 8;

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		value >>= 8;

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	}

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	return i + FIND_FIRST_BIT(value & 0x3F);

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Faster ( or at least cleaner ) implementation below?

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*/

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	if (GB(value, 0, 8) == 0) {

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		return FIND_FIRST_BIT(GB(value, 8, 6)) + 8;

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	} else {

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		return FIND_FIRST_BIT(GB(value, 0, 6));

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	}

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}

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static inline int KillFirstBit2x64(int value)

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{

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	if (GB(value, 0, 8) == 0) {

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		return KILL_FIRST_BIT(GB(value, 8, 6)) << 8;

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	} else {

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		return value & (KILL_FIRST_BIT(GB(value, 0, 6)) | 0x3F00);

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	}

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}

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/* [min,max), strictly less than */

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#define IS_BYTE_INSIDE(a,min,max) ((byte)((a)-(min)) < (byte)((max)-(min)))

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#define IS_INT_INSIDE(a,min,max) ((uint)((a)-(min)) < (uint)((max)-(min)))

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#define CHANCE16(a,b) ((uint16)Random() <= (uint16)((65536 * a) / b))

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#define CHANCE16R(a,b,r) ((uint16)(r=Random()) <= (uint16)((65536 * a) / b))

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#define CHANCE16I(a,b,v) ((uint16)(v) <= (uint16)((65536 * a) / b))

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#define for_each_bit(_i,_b)										\

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	for(_i=0; _b!=0; _i++,_b>>=1)								\

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		if (_b&1)

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#define abs myabs

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static inline int intxchg_(int *a, int b) { int t = *a; *a = b; return t; }

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#define intswap(a,b) ((b) = intxchg_(&(a), (b)))

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static inline int uintxchg_(uint *a, uint b) { uint t = *a; *a = b; return t; }

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#define uintswap(a,b) ((b) = uintxchg_(&(a), (b)))

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static inline int myabs(int a) { if (a<0) a = -a; return a; }

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static inline int64 myabs64(int64 a) { if (a<0) a = -a; return a; }

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static inline void swap_byte(byte *a, byte *b) { byte t = *a; *a = *b; *b = t; }

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static inline void swap_uint16(uint16 *a, uint16 *b) { uint16 t = *a; *a = *b; *b = t; }

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static inline void swap_int16(int16 *a, int16 *b) { int16 t = *a; *a = *b; *b = t; }

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static inline void swap_int32(int32 *a, int32 *b) { int32 t = *a; *a = *b; *b = t; }

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static inline void swap_tile(TileIndex *a, TileIndex *b) { TileIndex t = *a; *a = *b; *b = t; }

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#if defined(TTD_LITTLE_ENDIAN)

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#	define READ_LE_UINT16(b) (*(const uint16*)(b))

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#elif defined(TTD_BIG_ENDIAN)

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	static inline uint16 READ_LE_UINT16(const void *b) {

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		return ((const byte*)b)[0] + (((const byte*)b)[1] << 8);

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	}

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#endif

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/**

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 * ROtate x Left/Right by n (must be >= 0)

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 * @note Assumes a byte has 8 bits

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 */

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#define ROL(x, n) ((x) << (n) | (x) >> (sizeof(x) * 8 - (n)))

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#define ROR(x, n) ((x) >> (n) | (x) << (sizeof(x) * 8 - (n)))

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/**

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 * Return the smallest multiple of n equal or greater than x

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 * @note n must be a power of 2

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 */

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#define ALIGN(x, n) (((x) + (n) - 1) & ~((n) - 1))

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#endif /* MACROS_H */