Ambient occlusion (without corners)

1 files changed, 18 insertions, 13 deletions

diff --git a/src/World/World.cpp b/src/World/World.cpp
index a0b2b0d..d77ebe8 100644
--- a/src/World/World.cpp
+++ b/src/World/World.cpp
@@ -114,23 +114,28 @@ U64 World::timestamp() {
 void World::try_to_create_mesh_for_chunk(ChunkData& data) {
     auto index = data.index;
 
-    auto north = get({index.x, index.y - 1});
-    auto east = get({index.x + 1, index.y});
-    auto south = get({index.x, index.y + 1});
-    auto west = get({index.x - 1, index.y});
+    UInt neighbor_index = 0;
+    std::array<Chunk*, 8> neighbors;
+    for (I32 x = -1; x <= 1; x++) {
+        for (I32 y = -1; y <= 1; y++) {
+            if (x == 0 && y == 0) continue;
 
-    auto no_terrain = [](const ChunkData& d){
-        return !d.chunk.has_value();
-    };
+            auto& neighbor_data = get({index.x + x, index.y + y});
+            if (!neighbor_data.chunk.has_value()) return; // All neighbors need to be generated first.
 
-    if (no_terrain(north) || no_terrain(east) || no_terrain(south) || no_terrain(west)) {
-        return;
+            neighbors[neighbor_index++] = &neighbor_data.chunk.value();
+        }
     }
 
-    data.mesh_data = Generation::ChunkMeshing::create_mesh_for_chunk(
-        data.chunk.value(),
-        {north.chunk.value(), east.chunk.value(), south.chunk.value(), west.chunk.value()}
-    );
+    // Layout of neighboring chunks in `neighbors` array:
+    // (-1; -1) > (-1;  0) > (-1; 1) > (0; -1)
+    // ( 0;  1) > ( 1; -1) > ( 1; 0) > (1;  1)
+    Generation::ChunkMeshing::ChunkNeighbors chunk_neighbors {
+        neighbors[3], neighbors[6], neighbors[4], neighbors[1],
+        neighbors[5], neighbors[7], neighbors[2], neighbors[0],
+    };
+
+    data.mesh_data = create_mesh_for_chunk(data.chunk.value(), chunk_neighbors);
     data.mesh = GFX::Binder::load(data.mesh_data.value());
     data.status = ChunkStatus::Done;
 }