fix spacebar bug, fix ios depth buffer error, parallelize raytracing

src/node_panel_grid.cpp

@@ -281,7 +281,14 @@ void NodePanelGrid::bake_uvs()
     auto light_dir = glm::normalize(light_pos);
 
     auto data_out = std::make_unique<uint8_t[]>(fb.getWidth() * fb.getHeight() * 4);
+#if _WIN32
+    concurrency::parallel_for(int(0), fb.getHeight(), [&](int y)
+#elif __IOS__ || __OSX__
+    dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
+    dispatch_apply(count, queue, ^(size_t i)
+#else
     for (int y = 0; y < fb.getHeight(); y++)
+#endif
     {
         for (int x = 0; x < fb.getWidth(); x++)
         {
@@ -321,6 +328,9 @@ void NodePanelGrid::bake_uvs()
             }
         }
     }
+#if _WIN32 || __IOS__ || __OSX__
+    );
+#endif
     //stbi_write_jpg("bake-out.jpg", fb.getWidth(), fb.getHeight(), 4, data_out.get(), 75);
     m_texture.update(data_out.get());
 }