From dcc596ed8763efd9f71ce9a669cb67a1849d7c2b Mon Sep 17 00:00:00 2001
From: theo3 <arisstephenson2@gmail.com>
Date: Sun, 31 Dec 2023 21:24:07 -0800
Subject: define collisions

---
 include/definitions.h |  4 ++--
 include/entity.h      | 40 ++++++++++++++++++++++++++++++++++++----
 include/player.h      |  2 +-
 3 files changed, 39 insertions(+), 7 deletions(-)

(limited to 'include')

diff --git a/include/definitions.h b/include/definitions.h
index 7764f76f..088635db 100644
--- a/include/definitions.h
+++ b/include/definitions.h
@@ -22,7 +22,7 @@ typedef struct EnemyDefinition {
     u8 health;
     s16 speed;
     u8 damageType;
-    u8 flags2;
+    u8 collisionMask;
 } EnemyDefinition;
 
 typedef struct ProjectileDefinition {
@@ -43,7 +43,7 @@ typedef struct ProjectileDefinition {
     u8 field0x40;
     s16 speed;
     u8 damageType;
-    u8 flags2;
+    u8 collisionMask;
 } ProjectileDefinition;
 
 // Sprite data definition for objects and npcs
diff --git a/include/entity.h b/include/entity.h
index 8a66283c..455761c0 100644
--- a/include/entity.h
+++ b/include/entity.h
@@ -79,7 +79,39 @@ typedef enum {
     DirectionNorthWest = 0x1c, /**< North West. */
 } Direction;
 
-#define CONTACT_TAKE_DAMAGE 0x80
+/** Collision layer flags. */
+typedef enum {
+    COL_LAYER_NONE = 0x0,
+    COL_LAYER_BOTTOM = 0x1,
+    COL_LAYER_TOP = 0x2,
+    COL_LAYER_BOTH = 0x3
+} CollisionLayer;
+
+/** 
+ * Collision class flags.
+ * An Entity's collision class is determined by the first 3 bits of #Entity::collisionFlags.
+ * What classes an Entity collides with is determined by the bitfield #Entity::collisionMask.
+*/
+typedef enum {
+    COL_CLASS_NONE = 0x0,
+    COL_CLASS_PLAYER = 0x1,
+    COL_CLASS_ITEM = 0x2,
+    COL_CLASS_FLAMMABLE = 0x3,
+    COL_CLASS_4 = 0x4,
+    COL_CLASS_5 = 0x5,
+    COL_CLASS_6 = 0x6,
+    COL_CLASS_PACCI_OBJ = 0x7,
+} CollisionClass;
+
+/** Collision flags. */
+typedef enum {
+    COL_FLAG_3D = 0x10,
+    COL_FLAG_SOLID = 0x20,
+    COL_FLAG_REFLECT = 0x80,
+} CollisionFlags;
+
+#define COLLISION_MASK(layer) (1 << (layer))
+#define CONTACT_NOW 0x80
 
 typedef struct {
     void* entity1;
@@ -194,11 +226,11 @@ typedef struct Entity_ {
     /*0x2c*/ union SplitWord x; /**< X position, fixed point Q16.16. */
     /*0x30*/ union SplitWord y; /**< Y position, fixed point Q16.16. */
     /*0x34*/ union SplitWord z; /**< Z position, fixed point Q16.16. */
-    /*0x38*/ u8 collisionLayer; /**< Collision layer. */
+    /*0x38*/ u8 collisionLayer; /**< @see CollisionLayer. */
     /*0x39*/ s8 interactType;
     /*0x3a*/ u8 gustJarState;       /**< 4: grabbed by GustJar */
-    /*0x3b*/ u8 flags2;             /**< Debug visualization related? */
-    /*0x3c*/ u8 collisionFlags;     /**< Controls collision modes. */
+    /*0x3b*/ u8 collisionMask;      /**< Bitfield. @see CollisionClass */
+    /*0x3c*/ u8 collisionFlags;     /**< @see CollisionFlags, @see CollisionClass */
     /*0x3d*/ s8 iframes;            /**< Invulnerability frames. */
     /*0x3e*/ u8 knockbackDirection; /**< Direction of knockback. */
     /*0x3f*/ u8 hitType;            /**< Behavior as a collision sender. */
diff --git a/include/player.h b/include/player.h
index 0f0aa027..e344d0af 100644
--- a/include/player.h
+++ b/include/player.h
@@ -511,7 +511,7 @@ typedef struct {
     /*0x39*/ u8 field_0x39;
     /*0x3a*/ u8 field_0x3a;
     /*0x3b*/ u8 field_0x3b;
-    /*0x3c*/ u8 field_0x3c;
+    /*0x3c*/ u8 killed; /**< Non-zero if player is dead */
     /*0x3d*/ u8 moleMittsState;
     /*0x3e*/ u8 swordDamage : 2;
     /*    */ u8 filler14 : 6;
-- 
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