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msh_math.h File Reference

Math functions. More...

Defines
#define	BOUNDS(num, min, max)   ((num) < (min) ? (min) : ((num) > (max) ? (max) : (num)))
#define	math_sin(deg)   ((deg) >= 0 ? _sin_table[deg] : -_sin_table[-(deg)])
#define	math_cos(deg)   ((deg) >= 0 ? _cos_table[deg] : _cos_table[-(deg)])
Functions
fixed	math_atan2 (fixed y, fixed x)
void	math_fastdiv (s32 n, s32 d, s32 *result, s32 *remainder)
void	math_rand_set_seed (u32 seed)
u32	math_rand_get_seed ()
u16	math_rand (u16 max)

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Detailed Description

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Define Documentation

#define BOUNDS (  num, min, max    )     ((num) < (min) ? (min) : ((num) > (max) ? (max) : (num)))

Returns num if it is in between min and max, otherwise num is clipped to min or max

#define math_sin (  deg    )     ((deg) >= 0 ? _sin_table[deg] : -_sin_table[-(deg)])

Parameters: deg  s16 [-359..359] Angle in degrees Returns: fixed Sine of angle

#define math_cos (  deg    )     ((deg) >= 0 ? _cos_table[deg] : _cos_table[-(deg)])

Parameters: deg  s16 [-359..359] Angle in degrees Returns: fixed Cosine of angle

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Function Documentation

fixed math_atan2 (  fixed    y, fixed    x )

Parameters: y  Y x  X Returns: Result

void math_fastdiv (  s32    n, s32    d, s32 *    result, s32 *    remainder )

Parameters: n  Numerator d  Denomenator result  Result remainder  Remainder Uses the GBA BIOS divide function. The result and remainder get placed in the addresses specified. eg. math_fastdiv(129, 10, &result, &remainder);

void math_rand_set_seed (  u32    seed )

Parameters: seed  Start seed value Sets the starting seed value for the math_rand() function. A good way to set this is to run a timer and then use the value of the timer when the user presses a button. This only needs to be set once.

u32 math_rand_get_seed (    )

Returns: Seed value This returns the current random seed value. This value will change each time you call math_rand().

u16 math_rand (  u16    max )

Parameters: max  Maximum number Returns: [0..max] Random number Returns a random from 0 to max. Eg. math_rand(255) will return a random number from 0 to 255. math_rand_set_seed() should be called before using this.

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