From 3ce8df35dc517ace6ea70f53c89cf8d2a37f44c9 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Dominik=20Madar=C3=A1sz?= <zaklaus@outlook.com>
Date: Wed, 3 Nov 2021 17:48:56 +0100
Subject: [PATCH] don't build over collidable/essential inner blocks

---
 code/game/src/items.c        | 6 +++++-
 code/game/src/world/blocks.h | 1 +
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/code/game/src/items.c b/code/game/src/items.c
index c96ebd6..02be5c4 100644
--- a/code/game/src/items.c
+++ b/code/game/src/items.c
@@ -65,7 +65,11 @@ void item_use(ecs_world_t *ecs, ItemDrop *it, Position p, uint64_t udata) {
                 } else {
                     return;
                 }
-            }
+            } 
+            // NOTE(zaklaus): This is an inner layer block, we can't build over it if it has a collision!
+            else if (l.block_id > 0 && blocks_get_flags(l.block_id) & (BLOCK_FLAG_COLLISION|BLOCK_FLAG_ESSENTIAL)) {
+                return;
+            } 
             world_chunk_replace_block(l.chunk_id, l.id, blocks_find(desc->place.kind + (asset_id)udata));
             it->quantity--;
         }break;
diff --git a/code/game/src/world/blocks.h b/code/game/src/world/blocks.h
index 3bb836f..2e1c077 100644
--- a/code/game/src/world/blocks.h
+++ b/code/game/src/world/blocks.h
@@ -5,6 +5,7 @@
 typedef enum {
     BLOCK_FLAG_COLLISION = (1 << 1),
     BLOCK_FLAG_HAZARD = (1 << 2),
+    BLOCK_FLAG_ESSENTIAL = (1 << 3),
 } block_flags;
 
 int32_t blocks_setup(void);