sm64

A Super Mario 64 decompilation
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decorative_pendulum.inc.c (955B)

      1 
      2 /**
      3  * Behavior for bhvDecorativePendulum.
      4  * This controls the pendulum that lies underneath the Tick Tock Clock painting.
      5  */
      6 
      7 void bhv_decorative_pendulum_init(void) {
      8     o->oAngleVelRoll = 0x100;
      9     bhv_init_room();
     10 }
     11 
     12 /**
     13  * Smoothly swing the decorative pendulum back and forth using constant angular
     14  * acceleration.
     15  */
     16 void bhv_decorative_pendulum_loop(void) {
     17     if (o->oFaceAngleRoll > 0) {
     18         o->oAngleVelRoll -= 0x08;
     19     } else {
     20         o->oAngleVelRoll += 0x08;
     21     }
     22 
     23     o->oFaceAngleRoll += o->oAngleVelRoll;
     24 
     25     /**
     26      * This if-statement is true twice in the span of 5 frames when
     27      * oAngleVelRoll takes values in {0x10, 0x08, 0x00, -0x08, -0x10}.
     28      * This means the sound we hear when the pendulum hits its upswing is
     29      * actually one sound played twice in rapid succession.
     30      */
     31     if (o->oAngleVelRoll == 0x10 || o->oAngleVelRoll == -0x10) {
     32         cur_obj_play_sound_2(SOUND_GENERAL_BIG_CLOCK);
     33     }
     34 }