From 0d2de2ba9c616862d7881f089382db772d034f89 Mon Sep 17 00:00:00 2001
From: Alexander <alex@cogarr.net>
Date: Sun, 27 Oct 2019 17:25:16 -0400
Subject: Various updates

---
 src/shared/phys/physcommon.cpp | 49 ++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 47 insertions(+), 2 deletions(-)

(limited to 'src/shared/phys')

diff --git a/src/shared/phys/physcommon.cpp b/src/shared/phys/physcommon.cpp
index 379ad55..45374d2 100644
--- a/src/shared/phys/physcommon.cpp
+++ b/src/shared/phys/physcommon.cpp
@@ -2,8 +2,14 @@
 #define __shared_physcommon_h
 #include <chrono>
 #include <list>
+#include <assert.h>
 #include <btBulletDynamicsCommon.h>
-
+extern "C" {
+  #include <lua.h>
+  #include <lauxlib.h>
+  #include <lualib.h>
+}
+#include <shared/lua_api/common.hpp>
 #include "physcommon.hpp"
 
 using namespace std::chrono;
@@ -11,6 +17,7 @@ using namespace std::chrono;
 btDiscreteDynamicsWorld* World;
 std::list<btCollisionObject*> Objects;
 std::list<btKinematicCharacterController*> Chars;
+extern lua_State *L;
 
 extern void dropCollisionObject(btCollisionObject* b);
 
@@ -45,7 +52,7 @@ btCollisionDispatcher* Dispatcher;
 btSequentialImpulseConstraintSolver* Solver;
 
 void phys_genesis(){
-	broadphase = new btAxisSweep3(btVector3(-1000,-1000,-1000),btVector3(1000,1000,1000));
+	broadphase = new btAxisSweep3(btVector3(-100000,-100000,-100000),btVector3(100000,100000,100000));
 	broadphase ->getOverlappingPairCache()->setInternalGhostPairCallback(new btGhostPairCallback());
 	//printf("Broadphase\n");
 	CollisionConfiguration = new btDefaultCollisionConfiguration();
@@ -84,6 +91,7 @@ void UpdatePhysics(double TDeltaTime, void(*f)(btCollisionObject *)) {
 	//printf("Pre step simulation\n");
 	World->stepSimulation(TDeltaTime * 0.2f, 60);
 	//printf("Done step simulation\n");
+	assert(lua_gettop(L) == 0);
 	if(f){
 		//printf("Updating the position of %llu objects\n", Objects.size());
 		// Relay the object's orientation to irrlicht
@@ -91,15 +99,52 @@ void UpdatePhysics(double TDeltaTime, void(*f)(btCollisionObject *)) {
 			(*f)(*it);
 		}
 	}
+	assert(lua_gettop(L) == 0);
+
+	//Call phy.oncollide(obj1, obj2, point1, point2, normal2)
+	lua_getglobal(L,"phys");//phys
+	lua_getfield(L,-1,"colliders");//phys,colliders
+	int nummanifolds = World->getDispatcher()->getNumManifolds();
+	pusherrorfunc(L);//{phys},{colliders},errfunc()
+	for(int i = 0; i < nummanifolds; i++){
+		//printf("Looking at manifold %d, top is %d\n", i, lua_gettop(L));
+
+		lua_getfield(L,-3,"oncollide");//{phys},{colliders},errfunc(),oncollide()
+		if(lua_isnil(L,-1)){
+			lua_pop(L,4);
+			return;
+		}
+		btPersistentManifold *mf = World->getDispatcher()->getManifoldByIndexInternal(i);
+		btCollisionObject *oa = (btCollisionObject*)mf->getBody0();
+		btCollisionObject *ob = (btCollisionObject*)mf->getBody1();
+		btManifoldPoint mp = mf->getContactPoint(i);
+		btVector3 pa = mp.getPositionWorldOnA();
+		btVector3 pb = mp.getPositionWorldOnB();
+		btVector3 pn = mp.m_normalWorldOnB;
+		lua_pushlightuserdata(L,oa);//{phys},{colliders},errfunc(),oncollide(),ud_oa
+		lua_gettable(L,-4);//{phys},{colliders},errfun(),concollide(),{oa}
+		lua_pushlightuserdata(L,ob);//{phys},{colliders},errfunc(),oncollide(),{oa},ud_ob
+		lua_gettable(L,-5);//{phys},{colliders},errfunc(),oncollide(),{oa},{ob}
+		pushvector3d(L,pa.x(),pa.y(),pa.z());
+		pushvector3d(L,pb.x(),pb.y(),pb.z());
+		pushvector3d(L,pn.x(),pn.y(),pn.z());//{phys},{colliders},errfunc(),oncollide(),{oa},{ob},{pa},{pb},{normal}
+		int err = lua_pcall(L,5,0,-7);//{phys},{colliders},errfunc()
+		if(err)
+			printf("Failed to call oncollide\n");
+	}
+	lua_pop(L,3);
+	assert(lua_gettop(L) == 0);
 }
 
 high_resolution_clock::time_point t1 = high_resolution_clock::now();
 void gameloop_phys(void(*f)(btCollisionObject *)){
+	assert(lua_gettop(L) == 0);
 	//printf("Doing phys gameloop\n");
 	high_resolution_clock::time_point now = high_resolution_clock::now();
 	duration<double> delta = now-t1;
 	double steps = delta.count() * 10;
 	UpdatePhysics(steps,f);
 	t1 = now;
+	assert(lua_gettop(L) == 0);
 }
 #endif
-- 
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