From b840fb0a44f53ad6014e4e8e43fdd2681a16cd77 Mon Sep 17 00:00:00 2001
From: bjorn <tie.372@gmail.com>
Date: Mon, 15 May 2017 23:05:48 -0600
Subject: [PATCH] World:getLinearDamping; World:setLinearDamping;

---
 src/api/types/world.c | 19 +++++++++++++++++++
 src/physics/physics.c | 10 ++++++++++
 src/physics/physics.h |  2 ++
 3 files changed, 31 insertions(+)

diff --git a/src/api/types/world.c b/src/api/types/world.c
index 1444f87f..42b9d508 100644
--- a/src/api/types/world.c
+++ b/src/api/types/world.c
@@ -20,6 +20,23 @@ int l_lovrWorldSetGravity(lua_State* L) {
   return 0;
 }
 
+int l_lovrWorldGetLinearDamping(lua_State* L) {
+  World* world = luax_checktype(L, 1, World);
+  float damping, threshold;
+  lovrWorldGetLinearDamping(world, &damping, &threshold);
+  lua_pushnumber(L, damping);
+  lua_pushnumber(L, threshold);
+  return 2;
+}
+
+int l_lovrWorldSetLinearDamping(lua_State* L) {
+  World* world = luax_checktype(L, 1, World);
+  float damping = luaL_checknumber(L, 2);
+  float threshold = luaL_optnumber(L, 3, .01);
+  lovrWorldSetLinearDamping(world, damping, threshold);
+  return 0;
+}
+
 int l_lovrWorldUpdate(lua_State* L) {
   World* world = luax_checktype(L, 1, World);
   float dt = luaL_checknumber(L, 2);
@@ -30,6 +47,8 @@ int l_lovrWorldUpdate(lua_State* L) {
 const luaL_Reg lovrWorld[] = {
   { "getGravity", l_lovrWorldGetGravity },
   { "setGravity", l_lovrWorldSetGravity },
+  { "getLinearDamping", l_lovrWorldGetLinearDamping },
+  { "setLinearDamping", l_lovrWorldSetLinearDamping },
   { "update", l_lovrWorldUpdate },
   { NULL, NULL }
 };
diff --git a/src/physics/physics.c b/src/physics/physics.c
index ef7ef8d3..d261da20 100644
--- a/src/physics/physics.c
+++ b/src/physics/physics.c
@@ -42,6 +42,16 @@ void lovrWorldSetGravity(World* world, float x, float y, float z) {
   dWorldSetGravity(world->id, x, y, z);
 }
 
+void lovrWorldGetLinearDamping(World* world, float* damping, float* threshold) {
+  *damping = dWorldGetLinearDamping(world->id);
+  *threshold = dWorldGetLinearDampingThreshold(world->id);
+}
+
+void lovrWorldSetLinearDamping(World* world, float damping, float threshold) {
+  dWorldSetLinearDamping(world->id, damping);
+  dWorldSetLinearDampingThreshold(world->id, threshold);
+}
+
 void lovrWorldUpdate(World* world, float dt) {
   dWorldQuickStep(world->id, dt);
 }
diff --git a/src/physics/physics.h b/src/physics/physics.h
index a3417caa..b8800cb0 100644
--- a/src/physics/physics.h
+++ b/src/physics/physics.h
@@ -13,4 +13,6 @@ World* lovrWorldCreate();
 void lovrWorldDestroy(const Ref* ref);
 void lovrWorldGetGravity(World* world, float* x, float* y, float* z);
 void lovrWorldSetGravity(World* world, float x, float y, float z);
+void lovrWorldGetLinearDamping(World* world, float* damping, float* threshold);
+void lovrWorldSetLinearDamping(World* world, float damping, float threshold);
 void lovrWorldUpdate(World* world, float dt);