Branch-free triangle wave generator functions

gistfile1.c

#include <stdio.h>
#include <stdlib.h>

// assumes abs is branch-free
// see http://graphics.stanford.edu/~seander/bithacks.html#IntegerAbs

int triangle_wave_gen0(int i, int max_value) // min_value fixed to 0
{
  i += max_value;
  i %= max_value * 2;
  i -= max_value;
  i = abs(i);
  return i;
}

int triangle_wave_gen(int i, int min_value, int max_value)
{
  return triangle_wave_gen0(i, max_value - min_value) + min_value;
}

int main()
{
  for(int i = 0; i < 12; ++i)
    printf("#%d: %d\n", i, triangle_wave_gen(i, 10, 15));
  for(int i = 0; i < 12; ++i)
    printf("#%d: %d\n", i, triangle_wave_gen0(i, 5));
  return 0;
}