From afa9f963efa8457428ea7edd0255636205220c83 Mon Sep 17 00:00:00 2001
From: John Alanbrook <john@pockle.world>
Date: Fri, 17 Feb 2023 07:16:52 +0000
Subject: [PATCH] Shape specific collision handling

---
 source/engine/2dphysics.c  | 40 +++++++++++++++++++++++++++-----------
 source/engine/2dphysics.h  |  5 +++++
 source/engine/ffi.c        | 24 ++++++++++++++++++-----
 source/engine/gameobject.h | 12 +-----------
 4 files changed, 54 insertions(+), 27 deletions(-)

diff --git a/source/engine/2dphysics.c b/source/engine/2dphysics.c
index 0442fd4..c40b056 100644
--- a/source/engine/2dphysics.c
+++ b/source/engine/2dphysics.c
@@ -559,27 +559,45 @@ void register_collide(void *sym) {
 
 }
 
-static cpBool script_phys_cb_begin(cpArbiter *arb, cpSpace *space, void *data) {
-    cpBody *body1;
-    cpBody *body2;
-    cpArbiterGetBodies(arb, &body1, &body2);
-
-    int g1 = cpBodyGetUserData(body1);
-    int g2 = cpBodyGetUserData(body2);
-
-    duk_push_heapptr(duk, id2go(g1)->cbs.begin.fn);
-    duk_push_heapptr(duk, id2go(g1)->cbs.begin.obj);
+void duk_call_phys_cb(cpArbiter *arb, struct callee c, int hit)
+{
+    duk_push_heapptr(duk, c.fn);
+    duk_push_heapptr(duk, c.obj);
 
     int obj = duk_push_object(duk);
 
     vect2duk(cpArbiterGetNormal(arb));
     duk_put_prop_literal(duk, obj, "normal");
 
-    duk_push_int(duk, g2);
+    duk_push_int(duk, hit);
     duk_put_prop_literal(duk, obj, "hit");
 
     duk_call_method(duk, 1);
     duk_pop(duk);
+}
+
+static cpBool script_phys_cb_begin(cpArbiter *arb, cpSpace *space, void *data) {
+
+    cpBody *body1;
+    cpBody *body2;
+    cpArbiterGetBodies(arb, &body1, &body2);
+
+    cpShape *shape1;
+    cpShape *shape2;
+    cpArbiterGetShapes(arb, &shape1, &shape2);
+
+    int g1 = cpBodyGetUserData(body1);
+    int g2 = cpBodyGetUserData(body2);
+    struct gameobject *go = id2go(g1);
+
+    
+
+    for (int i = 0; i < arrlen(go->shape_cbs); i++) {
+      if (go->shape_cbs[i].shape != shape1) continue;
+      duk_call_phys_cb(arb, go->shape_cbs[i].cbs.begin, g2);
+    }
+
+    duk_call_phys_cb(arb, go->cbs.begin, g2);
 
     return 1;
 }
diff --git a/source/engine/2dphysics.h b/source/engine/2dphysics.h
index 6f0e9d1..c89ac93 100644
--- a/source/engine/2dphysics.h
+++ b/source/engine/2dphysics.h
@@ -106,6 +106,11 @@ struct phys_cbs {
     struct callee separate;
 };
 
+struct shape_cb {
+  cpShape *shape;
+  struct phys_cbs cbs;
+};
+
 void phys2d_add_handler_type(int cmd, int go,  struct callee c);
 void register_collide(void *sym);
 void phys2d_set_gravity(cpVect v);
diff --git a/source/engine/ffi.c b/source/engine/ffi.c
index e2b3b09..c098442 100644
--- a/source/engine/ffi.c
+++ b/source/engine/ffi.c
@@ -742,14 +742,30 @@ duk_ret_t duk_register(duk_context *duk) {
    return 0;
 }
 
+void gameobject_add_shape_collider(int go, struct callee c, struct phys2d_shape *shape)
+{
+  struct shape_cb shapecb;
+  shapecb.shape = shape->shape;
+  shapecb.cbs.begin = c;
+  arrpush(id2go(go)->shape_cbs, shapecb);
+}
+
 duk_ret_t duk_register_collide(duk_context *duk) {
     int cmd = duk_to_int(duk, 0);
     void *fn = duk_get_heapptr(duk, 1);
     void *obj = duk_get_heapptr(duk, 2);
     int go = duk_get_int(duk, 3);
-
     struct callee c = {fn, obj};
-    phys2d_add_handler_type(cmd, go, c);
+
+    switch(cmd) {
+      case 0:
+        phys2d_add_handler_type(cmd, go, c);
+        break;
+
+      case 1:
+        gameobject_add_shape_collider(go, c, duk_get_pointer(duk,4));
+	break;
+    }
 
     return 0;
 }
@@ -833,8 +849,6 @@ duk_ret_t duk_yughlog(duk_context *duk) {
     return 0;
 }
 
-
-
 duk_ret_t duk_set_body(duk_context *duk) {
   int cmd = duk_to_int(duk, 0);
   int id = duk_to_int(duk, 1);
@@ -1174,7 +1188,7 @@ void ffi_load()
 
     DUK_FUNC(cmd, DUK_VARARGS);
     DUK_FUNC(register, 3);
-    DUK_FUNC(register_collide, 4);
+    DUK_FUNC(register_collide, DUK_VARARGS);
 
     DUK_FUNC(gui_text, 3);
     DUK_FUNC(gui_img, 2);
diff --git a/source/engine/gameobject.h b/source/engine/gameobject.h
index 95e24ae..50184b0 100644
--- a/source/engine/gameobject.h
+++ b/source/engine/gameobject.h
@@ -12,17 +12,6 @@ struct shader;
 struct sprite;
 struct component;
 
-struct editor {
-    mfloat_t color[3];
-    int id;
-    bool active;
-    bool prefabSync;
-    char mname[MAXNAME];
-    char *curPrefabPath;
-    char prefabName[MAXNAME];
-    char rootPrefabName[MAXNAME];
-};
-
 struct gameobject {
     cpBodyType bodytype;
     int next;
@@ -36,6 +25,7 @@ struct gameobject {
     cpBody *body; /* NULL if this object is dead */
     int id;
     struct phys_cbs cbs;
+    struct shape_cb *shape_cbs;
 };
 
 extern struct gameobject *gameobjects;