+static void map_reclassify( v2i start, v2i end )
+{
+ v2i full_start = { 1,1 };
+ v2i full_end = { world.w-1, world.h-1 };
+
+ if( !start || !end )
+ {
+ start = full_start;
+ end = full_end;
+ }
+
+ for( int y = vg_max( start[1], full_start[1] ); y < vg_min( end[1], full_end[1] ); y ++ )
+ {
+ for( int x = vg_max( start[0], full_start[0] ); x < vg_min( end[0], full_end[0] ); x ++ )
+ {
+ v2i dirs[] = {{1,0},{0,1},{-1,0},{0,-1}};
+
+ u8 config = 0x00;
+
+ if( pcell((v2i){x,y})->state & (FLAG_CANAL|FLAG_INPUT|FLAG_OUTPUT) )
+ {
+ for( int i = 0; i < vg_list_size( dirs ); i ++ )
+ {
+ struct cell *neighbour = pcell((v2i){x+dirs[i][0], y+dirs[i][1]});
+ if( neighbour->state & (FLAG_CANAL|FLAG_INPUT|FLAG_OUTPUT) )
+ config |= 0x1 << i;
+ }
+ }
+ else config = 0xF;
+
+ pcell((v2i){x,y})->config = config;
+ }
+ }
+}
+
+v2f const curve_3[] = {{0.5f,1.0f},{0.5f,0.625f},{0.625f,0.5f},{1.0f,0.5f}};
+v2f const curve_6[] = {{0.5f,1.0f},{0.5f,0.625f},{0.375f,0.5f},{0.0f,0.5f}};
+v2f const curve_9[] = {{1.0f,0.5f},{0.625f,0.5f},{0.5f,0.375f},{0.5f,0.0f}};
+v2f const curve_12[]= {{0.0f,0.5f},{0.375f,0.5f},{0.5f,0.375f},{0.5f,0.0f}};
+
+v2f const curve_7[] = {{0.5f,0.8438f},{0.875f,0.8438f},{0.625f,0.5f},{1.0f,0.5f}};
+v2f const curve_7_1[] = {{0.5f,0.8438f},{1.0f-0.875f,0.8438f},{1.0-0.625f,0.5f},{0.0f,0.5f}};
+
+float const curve_7_linear_section = 0.1562f;
+