Castlevania 64: Implement New Game (#2472)

worlds/cv64/src/drop_sub_weapon.c

@@ -0,0 +1,69 @@
+// Written by Moisés
+#include "include/game/module.h"
+#include "include/game/math.h"
+#include "cv64.h"
+
+extern vec3f player_pos;
+extern vec3s player_angle;      // player_angle.y = Player's facing angle (yaw)
+extern f32 player_height_with_respect_of_floor;     // Stored negative in-game
+
+#define SHT_MAX 32767.0f
+#define SHT_MINV (1.0f / SHT_MAX)
+
+void spawn_item_behind_player(s32 item) {
+    interactuablesModule* pickable_item = NULL;
+    const f32 spawnDistance = 8.0f;
+    vec3f player_backwards_dir;
+
+    pickable_item = (interactuablesModule*)module_createAndSetChild(moduleList_findFirstModuleByID(ACTOR_CREATOR), ACTOR_ITEM);
+    if (pickable_item != NULL) {
+        // Convert facing angle to a vec3f
+        // SHT_MINV needs to be negative here for the item to be spawned properly on the character's back
+        player_backwards_dir.x = coss(-player_angle.y) * -SHT_MINV;
+        player_backwards_dir.z = sins(-player_angle.y) * -SHT_MINV;
+        // Multiply facing vector with distance away from the player
+        vec3f_multiplyScalar(&player_backwards_dir, &player_backwards_dir, spawnDistance);
+        // Assign the position of the item relative to the player's current position.
+        vec3f_add(&pickable_item->position, &player_pos, &player_backwards_dir);
+        // The Y position of the item will be the same as the floor right under the player
+        // The player's height with respect of the flower under them is already stored negative in-game,
+        // so no need to substract
+        pickable_item->position.y = player_pos.y + 5.0f;
+        pickable_item->height = pickable_item->position.y;
+
+        // Assign item ID
+        pickable_item->item_ID = item;
+    }
+}
+
+
+const f32 droppingAccel = 0.05f;
+const f32 maxDroppingSpeed = 1.5f;
+f32 droppingSpeed = 0.0f;
+f32 droppingTargetYPos = 0.0f;
+u8 dropItemCalcFuncCalled = FALSE;
+
+s32 drop_item_calc(interactuablesModule* pickable_item) {
+    if (dropItemCalcFuncCalled == FALSE) {
+        droppingTargetYPos = player_pos.y + player_height_with_respect_of_floor + 1.0f;
+        if (pickable_item->item_ID == CROSS || pickable_item->item_ID == AXE ||
+            pickable_item->item_ID == CROSS__VANISH || pickable_item->item_ID == AXE__VANISH) {
+            droppingTargetYPos += 3.0f;
+        }
+        dropItemCalcFuncCalled = TRUE;
+        return TRUE;
+    }
+    if (pickable_item->position.y <= droppingTargetYPos) {
+        droppingSpeed = 0.0f;
+        dropItemCalcFuncCalled = FALSE;
+        return FALSE;
+    }
+    else {
+        if (droppingSpeed < maxDroppingSpeed) {
+            droppingSpeed += droppingAccel;
+        }
+        pickable_item->position.y -= droppingSpeed;
+        pickable_item->height = pickable_item->position.y;
+        return TRUE;
+    }
+}