u_math.c File Reference

Include dependency graph for u_math.c:

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Functions
static void	init_pow2_table (void)
static void	init_log2_table (void)
void	util_init_math (void)
	One time init for math utilities.
Variables
float	pow2_table [POW2_TABLE_SIZE]
	2^x, for x in [-1.0, 1.0)
float	log2_table [LOG2_TABLE_SIZE]
	log2(x), for x in [1.0, 2.0)

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Function Documentation

static void init_log2_table

(

void

)

[static]

Definition at line 51 of file u_math.c.

References log2_table, LOG2_TABLE_SCALE, and LOG2_TABLE_SIZE.

{
   unsigned i;
   for (i = 0; i < LOG2_TABLE_SIZE; i++)
      log2_table[i] = (float) log2(1.0 + i * (1.0 / LOG2_TABLE_SCALE));
}

static void init_pow2_table

(

void

)

[static]

Definition at line 38 of file u_math.c.

References pow(), pow2_table, POW2_TABLE_OFFSET, POW2_TABLE_SCALE, and POW2_TABLE_SIZE.

{
   int i;
   for (i = 0; i < POW2_TABLE_SIZE; i++)
      pow2_table[i] = (float) pow(2.0, (i - POW2_TABLE_OFFSET) / POW2_TABLE_SCALE);
}

void util_init_math

(

void

)

One time init for math utilities.

Definition at line 63 of file u_math.c.

References FALSE, init_log2_table(), init_pow2_table(), and TRUE.

{
   static boolean initialized = FALSE;
   if (!initialized) {
      init_pow2_table();
      init_log2_table();
      initialized = TRUE;
   }
}

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Variable Documentation

float log2_table[LOG2_TABLE_SIZE]

log2(x), for x in [1.0, 2.0)

Definition at line 47 of file u_math.c.

float pow2_table[POW2_TABLE_SIZE]

2^x, for x in [-1.0, 1.0)

Definition at line 34 of file u_math.c.

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