Improved terrain generation - features! [1/2]

- @reglnk asked me to commit this early to experiment with this
  weird-ass heightmap bug that messes with tree placement

1 files changed, 51 insertions, 0 deletions

diff --git a/game/shared/feature.cc b/game/shared/feature.cc
new file mode 100644
index 0000000..6f884b2
--- /dev/null
+++ b/game/shared/feature.cc
@@ -0,0 +1,51 @@
+#include "shared/pch.hh"
+#include "shared/feature.hh"
+
+#include "shared/chunk.hh"
+#include "shared/coord.hh"
+#include "shared/dimension.hh"
+#include "shared/voxel_storage.hh"
+
+void Feature::place(const voxel_pos &vpos, Dimension *dimension, bool overwrite) const
+{
+    for(const auto &it : (*this)) {
+        auto it_vpos = vpos + it.first;
+        auto it_cpos = coord::to_chunk(it_vpos);
+
+        if(auto chunk = dimension->create_chunk(it_cpos)) {
+            auto it_lpos = coord::to_local(it_vpos);
+            auto it_index = coord::to_index(it_lpos);
+
+            if(chunk->get_voxel(it_index) && !overwrite) {
+                // There is something in the way
+                // and the called intentionally requested
+                // we do not force feature to overwrite voxels
+                continue;
+            }
+
+            chunk->set_voxel(it.second, it_index);
+        }
+    }
+}
+
+void Feature::place(const voxel_pos &vpos, const chunk_pos &cpos, VoxelStorage &voxels, bool overwrite) const
+{
+    for(const auto &it : (*this)) {
+        auto it_vpos = vpos + it.first;
+        auto it_cpos = coord::to_chunk(it_vpos);
+
+        if(it_cpos == cpos) {
+            auto it_lpos = coord::to_local(it_vpos);
+            auto it_index = coord::to_index(it_lpos);
+
+            if(voxels[it_index] && !overwrite) {
+                // There is something in the way
+                // and the called intentionally requested
+                // we do not force feature to overwrite voxels
+                continue;
+            }
+
+            voxels[it_index] = it.second;
+        }
+    }
+}