Proper block clump separation

Co-authored-by: sigonasr2 <sigonasr2@gmail.com>

Block.h

@@ -5,6 +5,7 @@
 class Block{
     public:
     vf2d pos;
+    bool markedForDeletion=false;
     Block(vf2d pos)
     :pos(pos){}
 };

Board.cpp

@@ -37,9 +37,35 @@ std::vector<BlockClump>&Board::getBlockClumps(){
 
 void Board::removeClump(int ind){
     BlockClump&c=clumps[ind];
-    for (Block b:c.getBlocks()){
-        cols[b.pos.x/12].push_back(b);
-        cols[b.pos.x/12][cols[b.pos.x/12].size()-1].pos=c.getBlockPosition(b);
+    for (Block&b:c.getBlocks()){
+        if (b.markedForDeletion) continue;
+        vf2d relativePos=b.pos;
+        b.pos=c.getBlockPosition(b);
+        bool emptyAirBelow=true;
+        for (int i=0;i<cols[b.pos.x/12].size();i++) {
+            Block&b2=cols[b.pos.x/12][i];
+            if (b.pos.y+12>=b2.pos.y&&b.pos.y<=b2.pos.y+12) {
+                emptyAirBelow=false;
+                break;
+            }
+        }
+        if (b.pos.y>=yBottom) {
+            emptyAirBelow=false;
+        }
+        if (emptyAirBelow) {
+            BlockClump c2;
+            for (int i=0;i<c.getBlocks().size();i++) {
+                Block&b2=c.getBlocks()[i];
+                if (b.pos.x==b2.pos.x) {
+                    b2.markedForDeletion=true;
+                    c2.addBlock(relativePos);
+                }
+                c2.y=c.y;
+            }
+            clumps.push_back(c2);
+        } else {
+            cols[b.pos.x/12].push_back(b);
+        }
     }
     clumps.erase(clumps.begin()+ind);
 }