Add the World:getStaticTags() method to retrieve only static tags

src/api/l_physics_world.c

@@ -286,6 +286,15 @@ static int l_lovrWorldGetTags(lua_State* L) {
   return 1;
 }
 
+static int l_lovrWorldIsTagStatic(lua_State* L) {
+  World* world = luax_checkworld(L, 1);
+  const char* tag = luaL_checkstring(L, 2);
+  bool isStatic;
+  luax_assert(L, lovrWorldIsTagStatic(world, tag, &isStatic));
+  lua_pushboolean(L, isStatic);
+  return 1;
+}
+
 static int l_lovrWorldGetColliderCount(lua_State* L) {
   World* world = luax_checkworld(L, 1);
   uint32_t count = lovrWorldGetColliderCount(world);
@@ -608,6 +617,7 @@ const luaL_Reg lovrWorld[] = {
   { "destroy", l_lovrWorldDestroy },
   { "isDestroyed", l_lovrWorldIsDestroyed },
   { "getTags", l_lovrWorldGetTags },
+  { "isTagStatic", l_lovrWorldIsTagStatic },
   { "getColliderCount", l_lovrWorldGetColliderCount },
   { "getJointCount", l_lovrWorldGetJointCount },
   { "getColliders", l_lovrWorldGetColliders },

src/modules/physics/physics.c

@@ -510,6 +510,13 @@ uint32_t lovrWorldGetTagMask(World* world, const char* string, size_t length) {
   return (accept ? accept : ~ignore) | 0x80000000;
 }
 
+bool lovrWorldIsTagStatic(World* world, const char* tag, bool* isStatic) {
+  uint8_t index = findTag(world, tag, strlen(tag));
+  lovrCheck(index != 0xff, "Unknown tag '%s'", tag);
+  *isStatic = world->staticTagMask & (1 << index);
+  return true;
+}
+
 uint32_t lovrWorldGetColliderCount(World* world) {
   return JPH_PhysicsSystem_GetNumBodies(world->system);
 }

src/modules/physics/physics.h

@@ -80,6 +80,7 @@ void lovrWorldDestruct(World* world);
 bool lovrWorldIsDestroyed(World* world);
 char** lovrWorldGetTags(World* world, uint32_t* count);
 uint32_t lovrWorldGetTagMask(World* world, const char* string, size_t length);
+bool lovrWorldIsTagStatic(World* world, const char* tag, bool* isStatic);
 uint32_t lovrWorldGetColliderCount(World* world);
 uint32_t lovrWorldGetJointCount(World* world);
 Collider* lovrWorldGetColliders(World* world, Collider* collider);

test/lovr/physics.lua

@@ -10,6 +10,18 @@ group('physics', function()
       expect(taggedWorld:getTags()).to.equal({ 'a', 'b' })
     end)
 
+    test(':isTagStatic', function()
+      local taggedWorld = lovr.physics.newWorld({
+        tags = { 'dynamic', 'environment', 'sensor' },
+        staticTags = { 'environment', 'sensor' }
+      })
+
+      expect(taggedWorld:isTagStatic('dynamic')).to.equal(false)
+      expect(taggedWorld:isTagStatic('environment')).to.equal(true)
+      expect(taggedWorld:isTagStatic('sensor')).to.equal(true)
+      expect(function() taggedWorld:isTagStatic('unknown') end).to.fail()
+    end)
+
     test('distant colliders', function()
       local c1 = world:newBoxCollider(1e8, 0, 0)
       local c2 = world:newBoxCollider(1e8, 0, 0)