al_ftofix(3) al_ftofix(3)

al_ftofix - Allegro 5 API

#include <allegro5/allegro.h>
al_fixed al_ftofix(double x);

Converts a floating point value to fixed point. Unlike al_itofix(3), this function clamps values which could overflow the type conversion, setting Allegro’s errno to ERANGE in the process if this happens.


al_fixed number;
number = al_itofix(-40000);
assert(al_fixfloor(number) == -32768);
number = al_itofix(64000);
assert(al_fixfloor(number) == 32767);
assert(!al_get_errno()); /* This will fail. */

Returns the value of the floating point value converted to fixed point clamping overflows (and setting Allegro’s errno).

al_fixtof(3), al_itofix(3), al_fixtoi(3), al_get_errno(3)

Allegro reference manual