+ //vg_info( "frame: %u\n", world.sim_frame );
+ sfx_set_playrnd( &audio_random, &audio_system_balls_switching, 0, 9 );
+
+ // Update splitter deltas
+ for( int i = 0; i < world.h*world.w; i ++ )
+ {
+ struct cell *cell = &world.data[i];
+ if( cell->config == k_cell_type_split )
+ {
+ cell->state &= ~FLAG_FLIP_ROTATING;
+ }
+ if( cell->state & FLAG_IS_TRIGGER )
+ cell->state &= ~FLAG_TRIGGERED;
+ }
+
+ int alive_count = 0;
+
+ // Update fish positions
+ for( int i = 0; i < world.num_fishes; i ++ )
+ {
+ struct fish *fish = &world.fishes[i];
+
+ if( fish->state == k_fish_state_soon_dead )
+ fish->state = k_fish_state_dead;
+
+ if( fish->state < k_fish_state_alive )
+ continue;
+
+ struct cell *cell_current = pcell( fish->pos );
+
+ if( fish->state == k_fish_state_alive )
+ {
+ // Apply to output
+ if( cell_current->state & FLAG_OUTPUT )
+ {
+ for( int j = 0; j < arrlen( world.io ); j ++ )
+ {
+ struct cell_terminal *term = &world.io[j];
+
+ if( term->id == fish->pos[1]*world.w + fish->pos[0] )
+ {
+ struct terminal_run *run = &term->runs[ world.sim_run ];
+ if( run->recv_count < vg_list_size( run->recieved ) )
+ run->recieved[ run->recv_count ++ ] = fish->payload;
+
+ break;
+ }
+ }
+
+ fish->state = k_fish_state_dead;
+ continue;
+ }
+
+ if( cell_current->config == k_cell_type_split )
+ {
+ // Flip flop L/R
+ fish->dir[0] = cell_current->state&FLAG_FLIP_FLOP?1:-1;
+ fish->dir[1] = 0;
+
+ if( !(cell_current->state & FLAG_TARGETED) )
+ cell_current->state ^= FLAG_FLIP_FLOP;
+ }
+ else if( cell_current->config == k_cell_type_merge )
+ {
+ // Can only move up
+ fish->dir[0] = 0;
+ fish->dir[1] = -1;
+ }
+ else
+ {
+ struct cell *cell_next = pcell( (v2i){ fish->pos[0]+fish->dir[0], fish->pos[1]+fish->dir[1] } );
+ if( !(cell_next->state & (FLAG_CANAL|FLAG_OUTPUT)) )
+ {
+ // Try other directions for valid, so down, left, right..
+ v2i dirs[] = {{1,0},{-1,0},{0,-1}};
+ //vg_info( "Trying some other directions...\n" );
+
+ for( int j = 0; j < vg_list_size(dirs); j ++ )
+ {
+ if( (dirs[j][0] == -fish->dir[0]) && (dirs[j][1] == -fish->dir[1]) )
+ continue;
+
+ if( pcell( (v2i){ fish->pos[0]+dirs[j][0], fish->pos[1]+dirs[j][1] } )->state & (FLAG_CANAL|FLAG_OUTPUT) )
+ {
+ fish->dir[0] = dirs[j][0];
+ fish->dir[1] = dirs[j][1];
+ }
+ }
+ }
+ }
+
+ fish->pos[0] += fish->dir[0];
+ fish->pos[1] += fish->dir[1];
+
+ struct cell *cell_entry = pcell( fish->pos );
+
+ if( !(cell_entry->state & (FLAG_INPUT|FLAG_CANAL|FLAG_OUTPUT) ))
+ {
+ if( world_check_pos_ok( fish->pos ) )
+ fish->state = k_fish_state_bg;
+ else
+ fish->state = k_fish_state_dead;
+ }
+ else
+ {
+ if( fish->dir[0] )
+ {
+ if( cell_entry->config == k_cell_type_split ||
+ cell_entry->config == k_cell_type_ramp_right ||
+ cell_entry->config == k_cell_type_ramp_left )
+ {
+ // Special death (FALL)
+ /*
+ v2_sub( fish->physics_co, fish->physics_v, fish->physics_v );
+ v2_divs( fish->physics_v, vg_time_delta, fish->physics_v );
+ */
+
+ fish->state = k_fish_state_dead;
+ vg_error( "REMOVE THIS CONDITION\n" );
+ continue;
+ }
+ }
+
+ if( cell_entry->config == k_cell_type_split )
+ {
+ sfx_set_playrnd( &audio_splitter, &audio_system_balls_important, 0, 1 );
+ cell_entry->state |= FLAG_FLIP_ROTATING;
+ }
+ }
+ }
+ else if( fish->state == k_fish_state_bg )
+ {
+ fish->pos[0] += fish->dir[0];
+ fish->pos[1] += fish->dir[1];
+
+ if( !world_check_pos_ok( fish->pos ) )
+ fish->state = k_fish_state_dead;
+ else
+ {
+ struct cell *cell_entry = pcell( fish->pos );
+
+ if( cell_entry->state & FLAG_CANAL )
+ {
+ if( cell_entry->config == k_cell_type_con_r || cell_entry->config == k_cell_type_con_u
+ || cell_entry->config == k_cell_type_con_l || cell_entry->config == k_cell_type_con_d )
+ {
+ fish->state = k_fish_state_alive;
+
+ fish->dir[0] = 0;
+ fish->dir[1] = 0;
+
+ switch( cell_entry->config )
+ {
+ case k_cell_type_con_r: fish->dir[0] = 1; break;
+ case k_cell_type_con_l: fish->dir[0] = -1; break;
+ case k_cell_type_con_u: fish->dir[1] = 1; break;
+ case k_cell_type_con_d: fish->dir[1] = -1; break;
+ }
+ }
+ }
+ }
+ }
+ else { vg_error( "fish behaviour unimplemented for behaviour type (%d)\n" ); }
+
+ if( fish->state >= k_fish_state_alive )
+ alive_count ++;
+ }
+
+ // Second pass (triggers)
+ for( int i = 0; i < world.num_fishes; i ++ )
+ {
+ struct fish *fish = &world.fishes[i];
+
+ if( fish->state == k_fish_state_alive )
+ {
+ struct cell *cell_current = pcell( fish->pos );
+
+ if( cell_current->state & FLAG_IS_TRIGGER )
+ {
+ int trigger_id = cell_current->links[0]?0:1;
+ int connection_id = cell_current->links[trigger_id];
+ int target_px = connection_id % world.w;
+ int target_py = (connection_id - target_px)/world.w;
+
+ vg_line2( (v2f){ fish->pos[0], fish->pos[1] }, (v2f){ target_px, target_py }, 0xffffffff, 0xffffffff );
+
+ struct cell *target_peice = &world.data[ cell_current->links[trigger_id] ];
+
+ cell_current->state |= FLAG_TRIGGERED;
+
+ if( trigger_id )
+ target_peice->state |= FLAG_FLIP_FLOP;
+ else
+ target_peice->state &= ~FLAG_FLIP_FLOP;
+ }
+ }
+ }