Extremely simple chunk-limited lighting

1 files changed, 34 insertions, 0 deletions

diff --git a/src/World/Generation/ChunkNeighbors.cpp b/src/World/Generation/ChunkNeighbors.cpp
new file mode 100644
index 0000000..f34466e
--- /dev/null
+++ b/src/World/Generation/ChunkNeighbors.cpp
@@ -0,0 +1,34 @@
+#include "ChunkNeighbors.hpp"
+
+namespace MC::World::Generation {
+
+Chunk::BlockData get_block_wrapping(const Chunk& chunk, const ChunkNeighbors& neighbors, Vector<3, I32> pos) {
+    const Chunk* chunk_to_ask;
+
+    auto overflow = [](I32& c, I32 max) -> I8 {
+        if (c < 0) { c += max; return -1; }
+        if (c >= max) { c -= max; return 1; }
+        return 0;
+    };
+
+    auto xo = overflow(pos.x(), Chunk::Width);
+    auto yo = overflow(pos.y(), Chunk::Height);
+    auto zo = overflow(pos.z(), Chunk::Width);
+
+    // Blocks above and below a chunk are always Air.
+    if (yo != 0) return {};
+
+    if (xo == 1 && zo == 1) { chunk_to_ask = neighbors.south_east; }
+    else if (xo == 1 && zo == -1) { chunk_to_ask = neighbors.north_east; }
+    else if (xo == -1 && zo == 1) { chunk_to_ask = neighbors.south_west; }
+    else if (xo == -1 && zo == -1) { chunk_to_ask = neighbors.north_west; }
+    else if (xo == 1) { chunk_to_ask = neighbors.east; }
+    else if (xo == -1) { chunk_to_ask = neighbors.west; }
+    else if (zo == 1) { chunk_to_ask = neighbors.south; }
+    else if (zo == -1) { chunk_to_ask = neighbors.north; }
+    else { chunk_to_ask = &chunk; }
+
+    return chunk_to_ask->at(pos.x(), pos.y(), pos.z());
+}
+
+}
\ No newline at end of file