Sha256: 72ee05058020f647f4d3c5db93662026afc249adfed5c03f4a5585433c49c631
Contents?: true
Size: 730 Bytes
Versions: 11
Compression:
Stored size: 730 Bytes
Contents
#include "fast_math.h"
float sin_lookup[NUM_LOOKUP_VALUES];
//
void initialize_fast_math()
{
for(int i = 0; i < NUM_LOOKUP_VALUES; i++)
{
float angle = (float)i / LOOKUPS_PER_DEGREE;
sin_lookup[i] = sin(DEGREES_TO_RADIANS(angle + LOOKUP_PRECISION));
}
// Ensure the cardinal directions are 100% accurate.
for (int i = 0; i <= 270; i += 90)
{
sin_lookup[i * LOOKUPS_PER_DEGREE] = sin(DEGREES_TO_RADIANS(i));
}
}
float fast_sin_deg(float degrees)
{
// Normalize to 0..360 (i.e. 0..2PI)
degrees = fmod(degrees, 360.0f);
if(degrees < 0.0f) degrees += 360.0f;
int index = (int)(degrees * LOOKUPS_PER_DEGREE);
return sin_lookup[index % NUM_LOOKUP_VALUES];
}
Version data entries
11 entries across 11 versions & 2 rubygems