rplight: compatibility with old macOS glibc

contrib/src/rplight/pointerSlotStorage.h

@@ -38,7 +38,14 @@ class PointerSlotStorage {};
 
 
 #include "pandabase.h"
+
+// Apple has an outdated libstdc++, so pull the class from TR1.
+#if defined(__GLIBCXX__) && __GLIBCXX__ <= 20070719
+#include <tr1/array>
+using std::tr1::array;
+#else
 #include <array>
+#endif
 
 /**
  * @brief Class to keep a list of pointers and nullpointers.
@@ -58,7 +65,11 @@ public:
    *   initialized to a nullptr.
    */
   PointerSlotStorage() {
+#if defined(__GLIBCXX__) && __GLIBCXX__ <= 20070719
+    _data.assign(nullptr);
+#else
     _data.fill(nullptr);
+#endif
     _max_index = 0;
     _num_entries = 0;
   }

contrib/src/rplight/pssmCameraRig.cxx

@@ -84,7 +84,7 @@ void PSSMCameraRig::init_cam_nodes() {
     lens->set_near_far(1, 1000);
 
     // Construct a new camera
-    _cameras[i] = new Camera("pssm-cam-" + to_string(((long long)i)), lens);
+    _cameras[i] = new Camera("pssm-cam-" + format_string(i), lens);
     _cam_nodes.push_back(NodePath(_cameras[i]));
     _max_film_sizes[i].fill(0);
   }

contrib/src/rplight/shadowManager.cxx

@@ -79,7 +79,7 @@ void ShadowManager::init() {
   for(size_t i = 0; i < _max_updates; ++i) {
 
     // Create the camera
-    PT(Camera) camera = new Camera("ShadowCam-" + to_string((long long)i));
+    PT(Camera) camera = new Camera("ShadowCam-" + format_string(i));
     camera->set_lens(new MatrixLens());
     camera->set_active(false);
     camera->set_scene(_scene_parent);