sm64

A Super Mario 64 decompilation
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blue_fish.inc.c (4589B)

      1 
      2 /**
      3  * @file blue_fish.inc.c
      4  * Implements behaviour and spawning for bhvBlueFish located in the castle aquarium outside of SA.
      5  */
      6 
      7 /**
      8  * Determines fish movement.
      9  */
     10 void bhv_blue_fish_movement_loop(void) {
     11     f32 randomSwitch;
     12 
     13     switch (o->oAction) {
     14         // Initial dive phase after spawning
     15         case BLUE_FISH_ACT_DIVE:
     16             cur_obj_init_animation_with_accel_and_sound(0, 1.0f);
     17 
     18             // Assigns random values to variables that help determine natural motion.
     19             if (o->oTimer == 0) {
     20                 o->oBlueFishRandomAngle = random_sign() * 0x800;
     21                 o->oBlueFishRandomVel = random_float() * 2;
     22                 o->oBlueFishRandomTime = (s32)(random_float() * 30) & 0xFE;
     23 
     24                 // Adjusts pitch velocity or sets to zero dependant on outcome of randomSwitch.
     25                 randomSwitch = random_float() * 5;
     26                 if (randomSwitch < 2.0f) {
     27                     o->oAngleVelPitch = random_f32_around_zero(128);
     28                 } else {
     29                     o->oAngleVelPitch = 0;
     30                 }
     31             }
     32 
     33             // Set forward velocity and progress oAction to BLUE_FISH_ACT_TURN.
     34             o->oForwardVel = o->oBlueFishRandomVel + 3.0f;
     35             if (o->oTimer >= o->oBlueFishRandomTime + 60) {
     36                 o->oAction++;
     37             }
     38 
     39             // Set pitch velocity
     40             if (o->oTimer < (o->oBlueFishRandomTime + 60) / 2) {
     41                 o->oFaceAnglePitch += o->oAngleVelPitch;
     42             } else {
     43                 o->oFaceAnglePitch -= o->oAngleVelPitch;
     44             }
     45 
     46             // Calculate new Y velocity
     47             o->oVelY = -sins(o->oFaceAnglePitch) * o->oForwardVel;
     48             break;
     49 
     50         // Animates and adjusts fish yaw angle.
     51         case BLUE_FISH_ACT_TURN:
     52             cur_obj_init_animation_with_accel_and_sound(0, 2.0f);
     53             o->oMoveAngleYaw = (s32)(o->oBlueFishRandomAngle + o->oMoveAngleYaw);
     54             if (o->oTimer == 15) {
     55                 o->oAction++;
     56             }
     57             break;
     58 
     59         // Animates and adjusts pitch to an upward direction.
     60         case BLUE_FISH_ACT_ASCEND:
     61             cur_obj_init_animation_with_accel_and_sound(0, 1.0f);
     62 
     63             // Progresses oAction to BLUE_FISH_ACT_TURN_BACK after elapsed time.
     64             if (o->oTimer >= o->oBlueFishRandomTime + 60) {
     65                 o->oAction++;
     66             }
     67 
     68             // Adjusts pitch angle. Direction relies on time not passed.
     69             if (o->oTimer < (o->oBlueFishRandomTime + 60) / 2) {
     70                 o->oFaceAnglePitch -= o->oAngleVelPitch;
     71             } else {
     72                 o->oFaceAnglePitch += o->oAngleVelPitch;
     73             }
     74             break;
     75 
     76         // Animates and turns fish around
     77         case BLUE_FISH_ACT_TURN_BACK:
     78             cur_obj_init_animation_with_accel_and_sound(0, 2.0f);
     79             o->oMoveAngleYaw = (s32)(o->oBlueFishRandomAngle + o->oMoveAngleYaw);
     80 
     81             // Sets the fish back to the BLUE_FISH_ACT_DIVE phase.
     82             if (o->oTimer == 15) {
     83                 o->oAction = BLUE_FISH_ACT_DIVE;
     84             }
     85             break;
     86     }
     87 
     88     // Calculates Y velocity and calls physics engine.
     89     o->oVelY = -sins(o->oFaceAnglePitch) * o->oForwardVel;
     90     cur_obj_move_using_fvel_and_gravity();
     91 
     92     // Deletes object if the parent has oAction set to BLUE_FISH_ACT_DUPLICATE.
     93     if (o->parentObj->oAction == BLUE_FISH_ACT_DUPLICATE) {
     94         obj_mark_for_deletion(o);
     95     }
     96 }
     97 
     98 /**
     99  * Spawns fifteen fish if Mario resides in room fifteen or seven.
    100  * They move at random within 200.0f
    101  */
    102 void bhv_tank_fish_group_loop(void) {
    103     struct Object *fish;
    104     s32 i;
    105 
    106     switch (o->oAction) {
    107         case BLUE_FISH_ACT_SPAWN:
    108             if (gMarioCurrentRoom == 15 || gMarioCurrentRoom == 7) {
    109 
    110                 // spawns fifteen fish and moves them within 200.0f
    111                 for (i = 0; i < 15; i++) {
    112                     fish = spawn_object_relative(0, 300, 0, -200, o, MODEL_FISH, bhvBlueFish);
    113                     obj_translate_xyz_random(fish, 200.0f);
    114                 }
    115 
    116                 // Proceed to BLUE_FISH_ACT_ROOM phase.
    117                 o->oAction++;
    118             }
    119             break;
    120 
    121         // Sets next oAction phase if Mario is not in rooms fifteen and seven.
    122         case BLUE_FISH_ACT_ROOM:
    123             if (gMarioCurrentRoom != 15 && gMarioCurrentRoom != 7) {
    124                 o->oAction++;
    125             }
    126             break;
    127 
    128         // Sets oAction to the BLUE_FISH_ACT_SPAWN phase.
    129         case BLUE_FISH_ACT_DUPLICATE:
    130             o->oAction = BLUE_FISH_ACT_SPAWN;
    131             break;
    132     }
    133 }