al_set_shader_bool - Man Page

#include <allegro5/allegro.h>

bool al_set_shader_bool(const char *name, bool b)

Sets a boolean uniform of the target bitmap’s shader.

Returns true on success. Otherwise returns false, e.g. if the uniform by that name does not exist in the shader.

5.1.6

al_use_shader(3)

al_use_shader(3).