fixed light propagation

diff --git a/src/chunk.cpp b/src/chunk.cpp
index 70a2563ae12c490379959bd37a35fc955db69996..cc53e912683cb99e576219709fd2151bf867019a 100644 (file)
--- a/src/chunk.cpp
+++ b/src/chunk.cpp
@@ -194,7 +194,6 @@ void work_dark() {
                        }
                }
        }
-       work_light();
 }
 
 }
@@ -207,17 +206,27 @@ void Chunk::SetBlock(int index, const Block &block) {
 
        if (&old_type == &new_type) return;
 
-       if (new_type.luminosity > 0) {
-               if (GetLight(index) < new_type.luminosity) {
-                       SetLight(index, new_type.luminosity);
-                       light_queue.emplace(this, ToPos(index));
-                       work_light();
-               }
-       } else if (new_type.block_light && GetLight(index) != 0) {
+       if (new_type.luminosity > old_type.luminosity) {
+               // light added
+               SetLight(index, new_type.luminosity);
+               light_queue.emplace(this, ToPos(index));
+               work_light();
+       } else if (new_type.luminosity < old_type.luminosity) {
+               // light removed
+               dark_queue.emplace(this, ToPos(index));
                SetLight(index, 0);
+               work_dark();
+               SetLight(index, new_type.luminosity);
+               light_queue.emplace(this, ToPos(index));
+               work_light();
+       } else if (new_type.block_light && !old_type.block_light) {
+               // obstacle added
                dark_queue.emplace(this, ToPos(index));
+               SetLight(index, 0);
                work_dark();
-       } else if (old_type.block_light && !new_type.block_light) {
+               work_light();
+       } else if (!new_type.block_light && old_type.block_light) {
+               // obstacle removed
                int level = 0;
                for (int face = 0; face < Block::FACE_COUNT; ++face) {
                        Pos next_pos(ToPos(index) + Block::FaceNormal(Block::Face(face)));