don't add obstructed blocks to meshes

[blank.git] / src / chunk.cpp

diff --git a/src/chunk.cpp b/src/chunk.cpp
index bed947e3d5fdfff7182056313a30667ad9996edb..16ff4e5023bb65f4f68495294b7b940007b67239 100644 (file)
--- a/src/chunk.cpp
+++ b/src/chunk.cpp
@@ -137,6 +137,8 @@ void Chunk::Update() {
 
        Model::Index vtx_counter = 0;
        for (size_t i = 0; i < Size(); ++i) {
+               if (Obstructed(i)) continue;
+
                const BlockType &type = Type(blocks[i]);
                type.FillModel(buf, ToCoords(i), vtx_counter);
                vtx_counter += type.shape->VertexCount();
@@ -146,6 +148,34 @@ void Chunk::Update() {
        dirty = false;
 }
 
+bool Chunk::Obstructed(int idx) const {
+       if (IsBorder(idx)) return false;
+
+       // not checking neighbor visibility here, so all
+       // invisible blocks must have their fill set to 6x false
+       // (the default, so should be okay)
+
+       const BlockType &right = Type(blocks[idx + 1]);
+       if (!right.fill.left) return false;
+
+       const BlockType &left = Type(blocks[idx - 1]);
+       if (!left.fill.right) return false;
+
+       const BlockType &top = Type(blocks[idx + Width()]);
+       if (!top.fill.bottom) return false;
+
+       const BlockType &bottom = Type(blocks[idx - Width()]);
+       if (!bottom.fill.top) return false;
+
+       const BlockType &front = Type(blocks[idx + Width() * Height()]);
+       if (!front.fill.back) return false;
+
+       const BlockType &back = Type(blocks[idx - Width() * Height()]);
+       if (!back.fill.front) return false;
+
+       return true;
+}
+
 
 ChunkLoader::ChunkLoader(const BlockTypeRegistry &reg, const Generator &gen)
 : base(0, 0, 0)