Placing blocks

1 files changed, 25 insertions, 0 deletions

diff --git a/src/World/Position.hpp b/src/World/Position.hpp
index f2915aa..f9b8ad1 100644
--- a/src/World/Position.hpp
+++ b/src/World/Position.hpp
@@ -2,6 +2,7 @@
 
 #include <array>
 #include <algorithm>
+#include "../Common/Casts.hpp"
 #include "ChunkDimensions.hpp"
 #include "../Math/Common.hpp"
 #include "../Math/Vector.hpp"
@@ -19,6 +20,18 @@ class BlockLocalOffset : public Vector<3, I16> {
 public:
     MC_POSITION_MAKE_DEFAULT_CONSTRUCTORS(BlockLocalOffset, I16)
 
+    // Create a block local offset from a unit normal,
+    // which is a vector with exactly one component being 1 or -1,
+    // with the rest being 0.
+    template<typename T>
+    static BlockLocalOffset from_unit_normal(Vector<3, T> normal) {
+        return {
+            TO(I16, normal.x()),
+            TO(I16, normal.y()),
+            TO(I16, normal.z())
+        };
+    }
+
     Bool fits_within_chunk() const {
         using namespace MC::World::ChunkDimensions;
         return x() >= 0 && x() < Width && y() >= 0 && y() < Height && z() >= 0 && z() < Width;
@@ -44,6 +57,18 @@ public:
 class BlockWorldOffset : public Vector<3, I64> {
 public:
     MC_POSITION_MAKE_DEFAULT_CONSTRUCTORS(BlockWorldOffset, I64)
+
+    // Create a block world offset from a unit normal,
+    // which is a vector with exactly one component being 1 or -1,
+    // with the rest being 0.
+    template<typename T>
+    static BlockWorldOffset from_unit_normal(Vector<3, T> normal) {
+        return {
+            TO(I64, normal.x()),
+            TO(I64, normal.y()),
+            TO(I64, normal.z())
+        };
+    }
 };
 
 // Position of a block within entire world.