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// Smootherstep
//
// smootherstep - Smootherstep interpolation
//
// y[t] = x[t] <= 0 ? 0 : x[t] >= 1 ? 1 : 6*x[t]^5 - 15*x[t]^4 + 10*x[t]^3
//
// X_n - 1
// Y_n - 1
// C_n - 0
#include "ts.h"
ts_parameter_t const ts_smootherstep_p = { .n_inputs = 1, .n_outputs = 1, .n_constants = 0, .params_size = 0 };
uint_t ts_smootherstep_offset( ts_constant_t const *c )
{
( void )c;
return ( 0 );
}
int ts_smootherstep(
fp_t * const *y, uint_t y_n,
fp_t const * const *x, uint_t x_n,
uint_t n, ts_constant_t const *c
)
{
TS_PROLOGUE( ts_smootherstep_p );
(void)c;
for( uint_t i = 0; i < n; ++i )
{
fp_t xi = x[0][i];
if ( xi <= 0 )
y[0][i] = 0;
else if ( xi >= 1 )
y[0][i] = 1;
else
{
fp_t x2 = xi * xi;
fp_t x3 = x2 * xi;
y[0][i] = 6 * x3 * x2 - 15 * x2 * x2 + 10 * x3;
}
}
return 0;
}
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