+ // 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 )
+ {
+ v2i_add( fish->pos, fish->dir, fish->pos );
+ 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;
+ }
+ }
+ }
+
+ // Third pass (collisions)
+ struct fish *fi, *fj;
+
+ for( int i = 0; i < world.num_fishes; i ++ )
+ {
+ fi = &world.fishes[i];
+
+ if( fi->state == k_fish_state_alive )
+ {
+ int continue_again = 0;
+
+ for( int j = i+1; j < world.num_fishes; j ++ )
+ {
+ fj = &world.fishes[j];
+
+ if( (fj->state == k_fish_state_alive) )
+ {
+ v2i fi_prev;
+ v2i fj_prev;
+
+ v2i_sub( fi->pos, fi->dir, fi_prev );
+ v2i_sub( fj->pos, fj->dir, fj_prev );
+
+ int
+ collide_next_frame = (
+ (fi->pos[0] == fj->pos[0]) &&
+ (fi->pos[1] == fj->pos[1]))? 1: 0,
+ collide_this_frame = (
+ (fi_prev[0] == fj->pos[0]) &&
+ (fi_prev[1] == fj->pos[1]) &&
+ (fj_prev[0] == fi->pos[0]) &&
+ (fj_prev[1] == fi->pos[1])
+ )? 1: 0;
+
+ if( collide_next_frame || collide_this_frame )
+ {
+ sw_set_achievement( "BANG" );
+
+ // Shatter death (+0.5s)
+ float death_time = collide_this_frame? 0.0f: 0.5f;
+
+ fi->state = k_fish_state_soon_dead;
+ fj->state = k_fish_state_soon_dead;
+ fi->death_time = death_time;
+ fj->death_time = death_time;
+
+ continue_again = 1;
+ break;
+ }
+ }
+ }
+ if( continue_again )
+ continue;
+ }
+ }
+
+ // Spawn fishes
+ for( int i = 0; i < arrlen( world.io ); i ++ )
+ {
+ struct cell_terminal *term = &world.io[ i ];
+ int posx = term->id % world.w;
+ int posy = (term->id - posx)/world.w;
+ int is_input = world.data[ term->id ].state & FLAG_INPUT;
+
+ if( is_input )
+ {
+ if( world.sim_frame < term->runs[ world.sim_run ].condition_count )
+ {
+ struct fish *fish = &world.fishes[ world.num_fishes ];
+ fish->pos[0] = posx;
+ fish->pos[1] = posy;
+ fish->state = k_fish_state_alive;
+ fish->payload = term->runs[ world.sim_run ].conditions[ world.sim_frame ];
+
+ struct cell *cell_ptr = pcell( fish->pos );
+
+ if( cell_ptr->config != k_cell_type_stub )
+ {
+ struct cell_description *desc = &cell_descriptions[ cell_ptr->config ];
+
+ v2i_copy( desc->start, fish->dir );
+ fish->flow_reversed = 1;
+
+ world.num_fishes ++;
+ alive_count ++;
+ }
+ }
+ }
+ }
+
+ if( alive_count == 0 )
+ {
+ world.completed = 1;
+
+ for( int i = 0; i < arrlen( world.io ); i ++ )
+ {
+ struct cell_terminal *term = &world.io[ i ];
+ int is_input = world.data[ term->id ].state & FLAG_INPUT;
+
+ if( !is_input )
+ {
+ struct terminal_run *run = &term->runs[ world.sim_run ];
+
+ if( run->recv_count == run->condition_count )
+ {
+ for( int j = 0; j < run->condition_count; j ++ )
+ {
+ if( run->recieved[j] != run->conditions[j] )
+ {
+ world.completed = 0;
+ break;
+ }
+ }
+ }
+ else
+ {
+ world.completed = 0;
+ break;
+ }
+ }
+ }
+
+ if( world.completed )
+ {
+ if( world.sim_run < world.max_runs-1 )
+ {
+ vg_success( "Run passed, starting next\n" );
+ world.sim_run ++;
+ world.sim_frame = 0;
+ world.sim_start = vg_time;
+ world.num_fishes = 0;
+
+ for( int i = 0; i < world.w*world.h; i ++ )
+ world.data[ i ].state &= ~FLAG_FLIP_FLOP;
+
+ continue;
+ }
+ else
+ {
+ vg_success( "Level passed!\n" );
+
+ u32 score = 0;
+ for( int i = 0; i < world.w*world.h; i ++ )
+ if( world.data[ i ].state & FLAG_CANAL )
+ score ++;
+
+ world.score = score;
+ world.time = world.sim_frame;
+ }
+ }
+ else
+ {
+ if( world.sim_run > 0 )
+ sw_set_achievement( "GOOD_ENOUGH" );
+
+ vg_error( "Level failed :(\n" );
+ }
+
+ // Copy into career data
+ if( world.ptr_career_level )
+ {
+ world.ptr_career_level->score = world.score;
+ world.ptr_career_level->time = world.time;
+ world.ptr_career_level->completed = world.completed;
+ }
+
+ simulation_stop(); // TODO: Async?
+ break;
+ }
+
+ world.sim_frame ++;
+ }
+
+ float scaled_time = 0.0f;
+ scaled_time = (vg_time-world.sim_start)*world.sim_speed;
+ world.frame_lerp = scaled_time - (float)world.sim_frame;
+
+ // Update positions
+ for( int i = 0; i < world.num_fishes; i ++ )
+ {
+ struct fish *fish = &world.fishes[i];
+
+ if( fish->state == k_fish_state_dead )
+ continue;
+
+ if( fish->state == k_fish_state_soon_dead && (world.frame_lerp > fish->death_time) )
+ continue; // Todo: particle thing?
+
+ struct cell *cell = pcell(fish->pos);
+ struct cell_description *desc = &cell_descriptions[ cell->config ];
+
+ v2f const *curve;
+
+ float t = world.frame_lerp;
+ if( fish->flow_reversed && !desc->is_linear )
+ t = 1.0f-t;
+
+ v2_copy( fish->physics_co, fish->physics_v );
+
+ switch( cell->config )
+ {
+ case k_cell_type_merge:
+ if( fish->dir[0] == 1 )
+ curve = curve_12;
+ else
+ curve = curve_9;
+ break;
+ case k_cell_type_con_r: curve = curve_1; break;
+ case k_cell_type_con_l: curve = curve_4; break;
+ case k_cell_type_con_u: curve = curve_2; break;
+ case k_cell_type_con_d: curve = curve_8; break;
+ case 3: curve = curve_3; break;
+ case 6: curve = curve_6; break;
+ case 9: curve = curve_9; break;
+ case 12: curve = curve_12; break;
+ case 7:
+ if( t > curve_7_linear_section )
+ {
+ t -= curve_7_linear_section;
+ t *= (1.0f/(1.0f-curve_7_linear_section));
+
+ curve = cell->state & FLAG_FLIP_FLOP? curve_7: curve_7_1;
+ }
+ else curve = NULL;
+ break;
+ default: curve = NULL; break;
+ }
+
+ if( curve )
+ {
+ float t2 = t * t;
+ float t3 = t * t * t;
+
+ float cA = 3.0f*t2 - 3.0f*t3;
+ float cB = 3.0f*t3 - 6.0f*t2 + 3.0f*t;
+ float cC = 3.0f*t2 - t3 - 3.0f*t + 1.0f;
+
+ fish->physics_co[0] = t3*curve[3][0] + cA*curve[2][0] + cB*curve[1][0] + cC*curve[0][0];
+ fish->physics_co[1] = t3*curve[3][1] + cA*curve[2][1] + cB*curve[1][1] + cC*curve[0][1];
+ fish->physics_co[0] += (float)fish->pos[0];
+ fish->physics_co[1] += (float)fish->pos[1];
+ }
+ else
+ {
+ v2f origin;
+ origin[0] = (float)fish->pos[0] + (float)fish->dir[0]*-0.5f + 0.5f;
+ origin[1] = (float)fish->pos[1] + (float)fish->dir[1]*-0.5f + 0.5f;
+
+ fish->physics_co[0] = origin[0] + (float)fish->dir[0]*t;
+ fish->physics_co[1] = origin[1] + (float)fish->dir[1]*t;
+ }
+ }
+ }
+}
+
+static void render_tiles( v2i start, v2i end, v4f const regular_colour, v4f const selected_colour )
+{
+ v2i full_start = { 0,0 };
+ v2i full_end = { world.w, world.h };
+
+ if( !start || !end )
+ {
+ start = full_start;
+ end = full_end;
+ }
+
+ glUniform4fv( SHADER_UNIFORM( shader_tile_main, "uColour" ), 1, regular_colour );
+
+ for( int y = start[1]; y < end[1]; y ++ )
+ {
+ for( int x = start[0]; x < end[0]; x ++ )