well yeah i guess

[carveJwlIkooP6JGAAIwe30JlM.git] / world_routes.h

/*
 * Copyright (C) 2021-2022 Mt.ZERO Software, Harry Godden - All Rights Reserved
 */

#ifndef ROUTES_H
#define ROUTES_H

#include "world.h"
#include "world_gate.h"

#include "shaders/vblend.h"
#include "shaders/route.h"
#include "shaders/routeui.h"


enum route_special_type
{
   k_route_special_type_none = 0,
   k_route_special_type_gate = 1,
   k_route_special_type_collector = 2
};

VG_STATIC void debug_sbpath( struct route_node *rna, struct route_node *rnb,
                          u32 colour, float xoffset )
{
   v3f p0, h0, p1, h1, l, p;
   
   v3_copy( rna->co, p0 );
   v3_muladds( rna->co, rna->h,  1.0f, h0 );
   v3_copy( rnb->co, p1 );
   v3_muladds( rnb->co, rnb->h, -1.0f, h1 );

   v3_muladds( p0, rna->right, xoffset, p0 );
   v3_muladds( h0, rna->right, xoffset, h0 );
   v3_muladds( p1, rnb->right, xoffset, p1 );
   v3_muladds( h1, rnb->right, xoffset, h1 );

   v3_copy( p0, l );

   for( int i=0; i<5; i++ )
   {
      float t = (float)(i+1)/5.0f;
      eval_bezier_time( p0, p1, h0, h1, t, p );
      vg_line( p, l, colour );
      v3_copy( p, l );
   }
}

/*
 * Get a list of node ids in stack, and return how many there is
 */
VG_STATIC u32 world_routes_get_path( u32 starter, u32 stack[64] )
{
   u32 stack_i[64];

   stack[0] = starter;
   stack_i[0] = 0;

   u32 si = 1;
   int loop_complete = 0;

   while( si )
   {
      if( stack_i[si-1] == 2 )
      {
         si --;
         continue;
      }

      struct route_node *rn = &world.nodes[stack[si-1]];
      u32 nextid = rn->next[stack_i[si-1]];
      stack_i[si-1] ++;

      if( nextid != 0xffffffff )
      {
         if( nextid == stack[0] )
         {
            loop_complete = 1;
            break;
         }

         int valid = 1;
         for( int sj=0; sj<si; sj++ )
         {
            if( stack[sj] == nextid )
            {
               valid = 0;
               break;
            }
         }

         if( valid )
         {
            stack_i[si] = 0;
            stack[si] = nextid;
            si ++;
            continue;
         }
      }
   }

   if( loop_complete )
      return si;

   return 0;
}

/*
 * Free a segment from the UI bar to be reused later
 */
VG_STATIC void world_routes_ui_popfirst( struct route_ui_bar *pui )
{
   if( pui->segment_count )
   {
      pui->segment_start ++;

      if( pui->segment_start == 32 )
         pui->segment_start = 0;

      pui->segment_count --;
   }
}

/*
 * Reset ui bar completely
 */
VG_STATIC void world_routes_ui_clear( struct route_ui_bar *pui )
{
   pui->segment_start = (pui->segment_start + pui->segment_count) %
                                                            k_max_ui_segments;
   pui->segment_count = 0;
}

/*
 * Break a index range into two pieces over the edge of the maximum it can
 * store. s1 is 0 always, so its a ring buffer.
 */
VG_STATIC void world_routes_ui_split_indices( u32 s0, u32 count, 
                                              u32 *c0, u32 *c1 )
{
   *c0 = (VG_MIN( s0+count, k_route_ui_max_indices )) - s0;
   *c1 = count-(*c0);
}

/*
 * Place a set of indices into gpu array automatically splits
 * across bounds
 */
VG_STATIC void world_routes_ui_set_indices( struct route_ui_bar *pui, 
                                         u16 *indices, u32 count )
{
   u32 c0, c1;
   world_routes_ui_split_indices( pui->indices_head, count, &c0, &c1 );

   glBindBuffer( GL_ELEMENT_ARRAY_BUFFER, pui->ebo );

   if( c0 )
   {
      glBufferSubData( GL_ELEMENT_ARRAY_BUFFER, pui->indices_head*sizeof(u16),
            c0*sizeof(u16), indices );
   }

   if( c1 )
   {
      glBufferSubData( GL_ELEMENT_ARRAY_BUFFER, 0, c1*sizeof(u16), indices+c0 );
      pui->indices_head = c1;
   }
   else
      pui->indices_head += c0;
}

/*
 * Place a set of vertices into gpu array 
 */
VG_STATIC u32 world_routes_ui_set_verts( struct route_ui_bar *pui,
                                      v2f *verts, u32 count )
{
   if( pui->vertex_head + count >= k_route_ui_max_verts )
      pui->vertex_head = 0;

   u32 vert_start = pui->vertex_head;
   pui->vertex_head += count;

   glBindBuffer( GL_ARRAY_BUFFER, pui->vbo );
   glBufferSubData( GL_ARRAY_BUFFER, (GLintptr)(vert_start*sizeof(v2f)),
                        sizeof(v2f)*count, verts );

   return vert_start;
}

/*
 * Update the last (count) vertices positions, does not add any.
 * Data must already be written to, and not cross either array boundaries.
 */
VG_STATIC u32 world_routes_ui_update_verts( struct route_ui_bar *pui,
                                         v2f *verts, u32 count )
{
   u32 vert_start = pui->vertex_head-count;

   glBindBuffer( GL_ARRAY_BUFFER, pui->vbo );
   glBufferSubData( GL_ARRAY_BUFFER, (GLintptr)(vert_start*sizeof(v2f)),
                        sizeof(v2f)*count, verts );

   return vert_start;
}

/* 
 * Current/active segment of this UI bar 
 */
VG_STATIC struct route_ui_segment *world_routes_ui_curseg( 
      struct route_ui_bar *pui )
{
   u32 index = (pui->segment_start+pui->segment_count-1)%k_max_ui_segments;
   return &pui->segments[ index ];
}

/*
 * Start a new segment in the UI bar, will create a split on the last one if
 * there is one active currently. (api)
 */
VG_STATIC void world_routes_ui_newseg( u32 route )
{
   struct route_ui_bar *pui = &world.ui_bars[route];

   pui->last_notch = 0.0;
   
   glBindVertexArray( pui->vao );
   if( pui->segment_count )
   {
      float const k_gap_width = 1.0f;

      struct route_ui_segment *cseg = world_routes_ui_curseg( pui );
      
      v2f verts[2];
      verts[0][0] =  cseg->length-k_gap_width;
      verts[0][1] =  0.5f;
      verts[1][0] =  cseg->length-k_gap_width;
      verts[1][1] = -0.5f;

      world_routes_ui_update_verts( pui, verts, 2 );
   }

   pui->segment_count ++;
   struct route_ui_segment *segment = world_routes_ui_curseg( pui );
   
   v2f verts[4];
   verts[0][0] =  0.0f;
   verts[0][1] =  0.5f;
   verts[1][0] =  0.0f;
   verts[1][1] = -0.5f;
   verts[2][0] =  0.0f;
   verts[2][1] =  0.5f;
   verts[3][0] =  0.0f;
   verts[3][1] = -0.5f;

   u32 vert_start = world_routes_ui_set_verts( pui, verts, 4 );

   u16 indices[6];
   indices[0] = vert_start + 0;
   indices[1] = vert_start + 1;
   indices[2] = vert_start + 3;
   indices[3] = vert_start + 0;
   indices[4] = vert_start + 3;
   indices[5] = vert_start + 2;

   segment->vertex_start = vert_start;
   segment->vertex_count = 4;
   segment->index_start  = pui->indices_head;
   segment->index_count  = 6;
   segment->notches      = 0;

   world_routes_ui_set_indices( pui, indices, 6 );
}

/*
 * Extend the end of the bar 
 */
VG_STATIC void world_routes_ui_updatetime( u32 route, float time )
{
   struct route_ui_bar *pui = &world.ui_bars[route];

   v2f verts[2];
   verts[0][0] =  time;
   verts[0][1] =  0.5f;
   verts[1][0] =  time;
   verts[1][1] = -0.5f;

   u32 vert_start = pui->vertex_head-2;

   glBindVertexArray( pui->vao );
   world_routes_ui_update_verts( pui, verts, 2 );

   struct route_ui_segment *cseg = world_routes_ui_curseg( pui );
   cseg->length = time;
}

VG_STATIC void world_routes_ui_draw_segment( struct route_ui_segment *segment )
{
   u32 c0, c1;
   world_routes_ui_split_indices( segment->index_start, 
                                  segment->index_count, &c0, &c1 );
   if( c0 )
      glDrawElements( GL_TRIANGLES, c0, GL_UNSIGNED_SHORT,
                        (void *)(segment->index_start*sizeof(u16)));
   if( c1 )
      glDrawElements( GL_TRIANGLES, c1, GL_UNSIGNED_SHORT, (void *)(0) );
}

/*
 * Draws full bar at Y offset(offset).
 */
VG_STATIC void world_routes_ui_draw( u32 route, v4f colour, float offset )
{
   float const k_bar_height = 0.05f,
               k_bar_scale_x = 0.005f;

   struct route *pr = &world.routes[route];
   struct route_ui_bar *pui = &world.ui_bars[route];

   float cx = pui->xpos;

   shader_routeui_use();
   glBindVertexArray( pui->vao );

   float fade_amt = world.time - pui->fade_timer_start;
   fade_amt = vg_clampf( fade_amt / 1.0f, 0.0f, 1.0f );
   
   float fade_block_size = 0.0f,
         main_block_size = 0.0f;

   for( u32 i=0; i<pui->fade_count; i++ )
   {
      u32 j = (pui->fade_start + i) % k_max_ui_segments;
      struct route_ui_segment *segment = &pui->segments[j];

      fade_block_size += segment->length;
   }

   cx -= fade_block_size * fade_amt;

   v4f fade_colour;
   v4_copy( colour, fade_colour );
   fade_colour[3] *= 1.0f-fade_amt;

   /* 1 minute timer */
   float timer_delta = (world.time - world.last_use) * (1.0/45.0),
         timer_scale = 1.0f - vg_minf( timer_delta, 1.0f );

   /* 
    * Draw fadeout bar
    */

   float height = pr->factive*k_bar_height * timer_scale,
         base = -1.0f + (offset+0.5f)*k_bar_height * timer_scale;

   shader_routeui_uColour( fade_colour );
   for( u32 i=0; i<pui->fade_count; i++ )
   {
      u32 j = (pui->fade_start + i) % k_max_ui_segments;
      struct route_ui_segment *segment = &pui->segments[j];

      shader_routeui_uOffset( (v4f){ cx*k_bar_scale_x, base,
                                     k_bar_scale_x, height } );

      world_routes_ui_draw_segment( segment );
      cx += segment->length;
   }

   /*
    * Draw main bar 
    */
   shader_routeui_uColour( colour );
   for( u32 i=0; i<pui->segment_count; i++ )
   {
      u32 j = (pui->segment_start + i) % k_max_ui_segments;
      struct route_ui_segment *segment = &pui->segments[j];

      shader_routeui_uOffset( (v4f){ cx*k_bar_scale_x, base,
                                     k_bar_scale_x, height } );

      world_routes_ui_draw_segment( segment );
      cx += segment->length;

      main_block_size += segment->length;
   }

   pui->xpos = vg_lerpf( pui->xpos, -main_block_size * 0.5f, 0.03f );
}

VG_STATIC void world_routes_local_set_record( u32 route, double lap_time )
{
   vg_success( "  NEW LAP TIME: %f\n", lap_time );

   struct route *pr = &world.routes[route];

   if( pr->track_id != 0xffffffff )
   {
      double time_centiseconds = lap_time * 100.0;
      if( time_centiseconds > (float)0xfffe )
         return;

      highscore_record temp;
      temp.trackid  = pr->track_id;
      temp.datetime = time(NULL);
      temp.playerid = 0;
      temp.points   = 0;
      temp.time     = time_centiseconds;

      highscores_push_record( &temp );

      struct track_info *pti = &track_infos[ pr->track_id ];
      pti->push = 1;
      
      if( pti->achievement_id )
      {
         steam_set_achievement( pti->achievement_id );
         steam_store_achievements();
      }
   }
   else
   {
      vg_warn( "There is no associated track for this record...\n" );
   }
}

/* 
 * Will scan the whole run for two things;
 *   1: we set a new record for the total, complete loop around the course
 *   2: the time of each segment will be recorded into the data buffer
 *       (not implemented: TODO)
 */
VG_STATIC void world_routes_verify_run( u32 route )
{
   struct route *pr = &world.routes[route];
   struct route_ui_bar *pui = &world.ui_bars[route];

   u32 stack[64];
   u32 si = world_routes_get_path( world.routes[route].start, stack );

   /* 
    * we only care about gates that ref gates, so shuffle down the array
    */
   struct route_timing *timings[64];
   u32 sj = 0, maxv = 0, begin = 0;
   for( u32 i=0; i<si; i++ )
   {
      struct route_node *inode = &world.nodes[stack[i]];

      if( inode->special_type == k_route_special_type_collector )
      {
         timings[sj ++] = &world.collectors[ inode->special_id ].timing;
      }
      else if( inode->special_type == k_route_special_type_gate )
      {
         timings[sj ++] = &world.gates[inode->special_id].timing;
      }
   }
   
   for( u32 i=0; i<sj; i++ )
   {
      if( timings[i]->version > maxv )
      {
         maxv = timings[i]->version;
         begin = i;
      }
   }

   vg_info( "== begin verification (%u) ==\n", route );
   vg_info( "  current version: %u\n", world.current_run_version );

   int verified = 0;
   if( timings[begin]->version == world.current_run_version )
      verified = 1;

   int valid_segment_count = 0;

   double lap_time = 0.0;

   for( u32 i=0; i<sj; i++ )
   {
      u32  j = (sj+begin-i-1) % sj,
          j1 = (j+1) % sj;

      double diff = 0.0;
   
      if( i<sj-1 )
      {
         /* j1v should equal jv+1 */
         if( timings[j1]->version == timings[j]->version+1 )
         {
            diff = timings[j1]->time - timings[j]->time;
            lap_time += diff;

            if( verified && diff > 0.0 ) valid_segment_count ++;
         }
         else
            verified = 0;
      }
      
      if( verified )
         vg_success( " [ %u %f ] %f\n", timings[j1]->time, 
                                        timings[j1]->version, diff );
      else
         vg_warn( " [ %u %f ]\n", timings[j1]->time, timings[j1]->version );
   }

   pui->fade_start = pui->segment_start;
   pui->fade_count = 0;
   pui->fade_timer_start = world.time;

   int orig_seg_count = pui->segment_count;

   world_routes_ui_newseg( route );

   if( verified )
   {
      world_routes_local_set_record( route, lap_time );
      world_routes_ui_popfirst( pui );
      pui->fade_count ++;
   }
   else
      vg_info( "  ctime: %f\n", lap_time );

   /* remove any excess we had from previous runs */
   int to_remove = orig_seg_count-valid_segment_count;
   for( int i=0; i<to_remove; i++ )
   {
      world_routes_ui_popfirst( pui );
      pui->fade_count ++;
   }

   world.routes[route].latest_pass = world.time;
}

/*
 * When going through a gate this is called for bookkeeping purposes
 */
VG_STATIC void world_routes_activate_gate( u32 id )
{
   struct route_gate *rg = &world.gates[id];
   struct route_node *pnode = &world.nodes[rg->node_id],
                     *pdest = &world.nodes[pnode->next[0]];

   world.last_use = world.time;

   struct route_collector *rc = &world.collectors[ pdest->special_id ];

   world.active_gate = id;
   rg->timing.version = world.current_run_version;
   rg->timing.time = world.time;

   for( u32 i=0; i<world.route_count; i++ )
   {
      struct route *route = &world.routes[i];
      
      int was_active = route->active;

      route->active = 0;
      for( u32 j=0; j<pdest->ref_count; j++ )
      {
         if( pdest->route_ids[j] == i )
         {
            world_routes_verify_run( i );
            route->active = 1;
            break;
         }
      }

      if( was_active && !route->active )
      {
         struct route_ui_bar *pui = &world.ui_bars[i];
         pui->fade_start = pui->segment_start;
         pui->fade_count = pui->segment_count;
         pui->fade_timer_start = world.time;

         world_routes_ui_clear( pui );
         vg_success( "CLEARING -> %u %u \n", pui->fade_start,
                                             pui->fade_count );
      }
   }
   
   world.current_run_version ++;

   rc->timing.version = world.current_run_version;
   rc->timing.time = world.time;
   world.current_run_version ++;
}

/*
 * Notify the UI system that we've reset the player
 */
VG_STATIC void world_routes_notify_reset(void)
{
   world.rewind_from = world.time;
   world.rewind_to = world.last_use;

#if 0
   for( int i=0; i<r->route_count; i++ )
   {
      struct route *route = &r->routes[i];

      if( route->active )
         world_routes_ui_notch( i, r->time - route->latest_pass );
   }
#endif
}

/* Rewind between the saved points in time */
VG_STATIC void world_routes_rollback_time( double t )
{
   world.time = vg_lerp( world.rewind_to, world.rewind_from, t );
}

/* draw lines along the paths */
VG_STATIC void world_routes_debug(void)
{
   for( int i=0; i<world.node_count; i++ )
   {
      struct route_node *rn = &world.nodes[i];
      vg_line_pt3( rn->co, 1.0f, rn->special_type? 0xffffff00: 0xff00b2ff );
   }

   for( int i=0; i<world.route_count; i++ )
   {
      struct route *route = &world.routes[i];

      u32 stack[64];
      u32 si = world_routes_get_path( route->start, stack );

      u32 colours[] = { 0xfff58142, 0xff42cbf5, 0xff42f56c, 0xfff542b3,
                        0xff5442f5 };

      u32 cc = colours[i%vg_list_size(colours)];

      for( int sj=0; sj<si; sj++ )
      {
         int sk = (sj+1)%si;

         struct route_node *pj = &world.nodes[stack[sj]],
                           *pk = &world.nodes[stack[sk]];
         debug_sbpath( pj, pk, cc, (float)i );
      }
   }

   for( int i=0; i<world.node_count; i++ )
   {
      struct route_node *ri = &world.nodes[i],
                        *rj = NULL;
      
      for( int j=0; j<2; j++ )
      {
         if( ri->next[j] != 0xffffffff )
         {
            rj = &world.nodes[ri->next[j]];
            vg_line( ri->co, rj->co, 0x20ffffff );
         }
      }
   }
}

VG_STATIC void world_routes_create_mesh( u32 route_id )
{
   struct route *route = &world.routes[ route_id ];

   u32 stack[64];
   u32 si = world_routes_get_path( route->start, stack );

   u32 last_valid = 0;

   for( int sj=0; sj<si; sj++ )
   {
      int sk=(sj+1)%si;

      struct route_node *rnj = &world.nodes[ stack[sj] ],
                        *rnk = &world.nodes[ stack[sk] ],
                        *rnl;
      
      if( rnj->special_type && rnk->special_type )
      {
         last_valid = 0;
         continue;
      }

      float base_x0 = (float)rnj->ref_count*-0.5f + (float)rnj->current_refs,
            base_x1 = (float)rnk->ref_count*-0.5f + (float)rnk->current_refs;

      if( rnk->special_type )
      {
         rnl = &world.nodes[ rnk->next[0] ];
         base_x1 = (float)rnl->ref_count*-0.5f + (float)rnl->current_refs;
      }

      if( sk == 0 )
      {
         base_x1 -= 1.0f;
      }

      v3f p0, h0, p1, h1, p, pd;
      
      v3_copy( rnj->co, p0 );
      v3_muladds( rnj->co, rnj->h,  1.0f, h0 );
      v3_copy( rnk->co, p1 );
      v3_muladds( rnk->co, rnk->h, -1.0f, h1 );

      float t=0.0f;
      int it = 0;

      for( int it=0; it<256; it ++ )
      {
         float const k_sample_dist = 0.02f;
         eval_bezier_time( p0,p1,h0,h1, t,p );
         eval_bezier_time( p0,p1,h0,h1, t+k_sample_dist,pd );

         float mod = k_sample_dist / v3_dist( p, pd );

         v3f v0,up, right;
         v3_muls( rnj->up, 1.0f-t, up );
         v3_muladds( up, rnk->up, t, up );

         v3_sub( pd,p,v0 );
         v3_cross( up, v0, right );
         v3_normalize( right );

         float cur_x = (1.0f-t)*base_x0 + t*base_x1;
         
         v3f sc, sa, sb, down;
         v3_muladds( p, right, cur_x, sc );
         v3_muladds( sc, up, 1.5f, sc );
         v3_muladds( sc, right,  0.45f, sa );
         v3_muladds( sc, right, -0.45f, sb );
         v3_muls( up, -1.0f, down );
         
         ray_hit ha, hb;
         ha.dist = 8.0f;
         hb.dist = 8.0f;
         if( ray_world( sa, down, &ha ) && 
             ray_world( sb, down, &hb ))
         {
            mdl_vert va, vb;
            
            v3_muladds( ha.pos, up, 0.06f, va.co );
            v3_muladds( hb.pos, up, 0.06f, vb.co );
            v3_copy( up, va.norm );
            v3_copy( up, vb.norm );
            v2_zero( va.uv );
            v2_zero( vb.uv );

            scene_push_vert( world.scene_lines, &va );
            scene_push_vert( world.scene_lines, &vb );

            if( last_valid )
            {
               /* Connect them with triangles */
               scene_push_tri( world.scene_lines, (u32[3]){ 
                     last_valid+0-2, last_valid+1-2, last_valid+2-2} );
               scene_push_tri( world.scene_lines, (u32[3]){ 
                     last_valid+1-2, last_valid+3-2, last_valid+2-2} );
            }
            
            last_valid = world.scene_lines->vertex_count;
         }
         else
            last_valid = 0;

         t += 1.0f*mod;

         if( t >= 1.0f )
         {
            /* TODO special case for end of loop, need to add triangles
             *      between first and last rungs */
            break;
         }
      }

      rnj->current_refs ++;
   }

   scene_copy_slice( world.scene_lines, &route->sm );
}

/* 
 * Create the strips of colour that run through the world along course paths
 */
VG_STATIC void world_routes_generate(void)
{
   vg_info( "Generating route meshes\n" );
   world.scene_lines = scene_init( world.dynamic_vgl, 200000, 300000 );

   for( u32 i=0; i<world.route_count; i++ )
      world_routes_create_mesh( i );

   vg_acquire_thread_sync();
   {
      scene_upload( world.scene_lines, &world.mesh_route_lines );
   }
   vg_release_thread_sync();
   vg_linear_del( world.dynamic_vgl, world.scene_lines );
}

/* determine if special type is required for this gate */
VG_STATIC enum route_special_type world_route_node_type( mdl_node *pnode )
{
   if( pnode->classtype == k_classtype_gate )
   {
      struct classtype_gate *inf = mdl_get_entdata( world.meta, pnode );

      if( inf->target )
      {
         mdl_node *pother = mdl_node_from_id( world.meta, inf->target );
         
         if( pother->classtype == k_classtype_gate )
         {
            return k_route_special_type_gate;
         }
      }

      return k_route_special_type_collector;
   }

   return k_route_special_type_none;
}

/* count entities and allocate correct amount of memory in advance */
VG_STATIC void world_routes_allocate(void)
{
   vg_info( "Allocating routes\n" );

   /* count */
   u32 node_count       = 0,
       route_count      = 0,
       gate_count       = 0,
       collector_count  = 0;
   
   for( int i=0; i<world.meta->info.node_count; i++ )
   {
      mdl_node *pnode = mdl_node_from_id( world.meta, i );

      if( pnode->classtype == k_classtype_route_node ||
          pnode->classtype == k_classtype_gate )
      {
         pnode->sub_uid = node_count;

         enum route_special_type type = world_route_node_type( pnode );

         if( type == k_route_special_type_gate )
            gate_count ++;
         else if( type == k_route_special_type_collector )
            collector_count ++;

         node_count ++;
      }
      else if( pnode->classtype == k_classtype_route )
      {
         route_count ++;
      }
   }

   /* allocate */
   u32 node_size        = node_count      * sizeof(struct route_node),
       route_size       = route_count     * sizeof(struct route),
       gate_size        = gate_count      * sizeof(struct route_gate),
       collector_size   = collector_count * sizeof(struct route_collector);

   world.nodes          = vg_linear_alloc( world.dynamic_vgl, node_size );
   world.routes         = vg_linear_alloc( world.dynamic_vgl, route_size );
   world.gates          = vg_linear_alloc( world.dynamic_vgl, gate_size );
   world.collectors     = vg_linear_alloc( world.dynamic_vgl, collector_size );
}

/* create node from mdl node */
VG_STATIC struct route_node *world_routes_create_node( mdl_node *pnode )
{
   struct route_node *rn = &world.nodes[ world.node_count ++ ];

   m4x3f transform;
   mdl_node_transform( pnode, transform );

   v3_copy( transform[3], rn->co );
   v3_copy( transform[0], rn->right );
   v3_copy( transform[1], rn->up );
   v3_muls( transform[2], -1.0f, rn->h );
   v3_normalize( rn->right );
   v3_normalize( rn->up );

   rn->next[0] = 0xffffffff;
   rn->next[1] = 0xffffffff;

   rn->special_type = 0;
   rn->special_id = 0;
   rn->current_refs = 0;
   rn->ref_count = 0;

   return rn;
}

/* retrieve the correct node id from mdl subuid */
VG_STATIC u32 world_routes_get_subuid( u32 target )
{
   if( target == 0 )
      return 0xffffffff;
   else
      return mdl_node_from_id( world.meta, target )->sub_uid;
}

#if 0
VG_STATIC void world_id_fixup( u32 *uid, mdl_context *mdl )
{
   if( *uid )
      *uid = mdl_node_from_id( mdl, *uid )->sub_uid;
   else
      *uid = 0xffffffff;
}
#endif

/* process gate attachement onto node */
VG_STATIC void world_routes_process_gate( struct route_node *rn, 
                                          mdl_node *pnode )
{
   struct classtype_gate *inf = mdl_get_entdata( world.meta, pnode );

   /* H is later scaled based on link distance */
   v3_normalize( rn->h );

   rn->next[0] = world_routes_get_subuid( inf->target );
   rn->next[1] = 0xffffffff;
   rn->special_type = world_route_node_type( pnode );

   /* process gate type */
   if( rn->special_type == k_route_special_type_gate )
   {
      mdl_node *pother = mdl_node_from_id( world.meta, inf->target );
      
      struct route_gate *rg = &world.gates[ world.gate_count ];

      rg->node_id = world.node_count-1;
      rg->timing.time = 0.0;
      rg->timing.version = 0;

      v3_copy( pnode->co,  rg->gate.co[0] );
      v3_copy( pother->co, rg->gate.co[1] );
      v4_copy( pnode->q,   rg->gate.q[0] );
      v4_copy( pother->q,  rg->gate.q[1] );
      v2_copy( inf->dims,  rg->gate.dims );

      gate_transform_update( &rg->gate );
      rn->special_id = world.gate_count;

      world.gate_count ++;
   }

   /* process collector type */
   else if( rn->special_type == k_route_special_type_collector )
   {
      struct route_collector *rc = 
         &world.collectors[ world.collector_count ];

      rc->timing.time = 0.0;
      rc->timing.version = 0;

      rn->special_id = world.collector_count;
      world.collector_count ++;
   }
   else
      vg_fatal_exit_loop( "Invalid state" );
}

/* create route from node description */
VG_STATIC void world_routes_create_route( mdl_node *pnode )
{
   mdl_context *mdl = world.meta;

   struct classtype_route *inf = mdl_get_entdata( mdl, pnode );
   struct route *route = &world.routes[ world.route_count ];
   memset( route, 0, sizeof(struct route) );

   v3_copy( inf->colour, route->colour );
   route->colour[3] = 1.0f;
   route->track_id = 0xffffffff;

   for( u32 j=0; j<vg_list_size(track_infos); j++ )
   {
      if( !strcmp( mdl_pstr(mdl,pnode->pstr_name), track_infos[j].name ))
      {
         route->track_id = j;
         break;
      }
   }

   route->start = world_routes_get_subuid( inf->id_start );
   route->active = 0;
   route->factive = 0.0f;
   mdl_node_transform( pnode, route->scoreboard_transform );

   struct route_ui_bar *pui = &world.ui_bars[ world.route_count ];
   pui->indices_head = k_route_ui_max_indices - 9;
   pui->vertex_head = k_route_ui_max_verts - 200;
   pui->segment_start = 0;
   pui->segment_count = 0;
   pui->last_notch = 0.0;
   pui->fade_start = 0;
   pui->fade_count = 0;
   pui->fade_timer_start = 0.0;

   world.route_count ++;
}

/* load all routes from model header */
VG_STATIC void world_routes_process(void)
{
   vg_info( "Initializing routes\n" );
   mdl_context *mdl = world.meta;

   for( int i=0; i<mdl->info.node_count; i++ )
   {
      mdl_node *pnode = mdl_node_from_id(mdl,i);

      if( pnode->classtype == k_classtype_route_node ||
          pnode->classtype == k_classtype_gate )
      {
         struct route_node *rn = world_routes_create_node( pnode );

         if( pnode->classtype == k_classtype_gate )
         {
            world_routes_process_gate( rn, pnode );
         }
         else
         {
            struct classtype_route_node *inf = mdl_get_entdata( mdl, pnode );
            rn->next[0] = world_routes_get_subuid( inf->target  );
            rn->next[1] = world_routes_get_subuid( inf->target1 );
         }
      }
      else if( pnode->classtype == k_classtype_route )
      {
         world_routes_create_route( pnode );
      }
   }

   /*
    * Gather references
    */
   for( int i=0; i<world.route_count; i++ )
   {
      struct route *route = &world.routes[i];

      u32 stack[64];
      u32 si = world_routes_get_path( route->start, stack );

      for( int sj=0; sj<si; sj++ )
      {
         struct route_node *rn = &world.nodes[ stack[sj] ];
         rn->route_ids[ rn->ref_count ++ ] = i;

         if( rn->ref_count > 4 )
            vg_warn( "Too many references on route node %i\n", i );
      }
   }
}

/* 
 * -----------------------------------------------------------------------------
 *                                    Events
 * -----------------------------------------------------------------------------
 */

VG_STATIC void world_routes_init(void)
{
   world.current_run_version = 2;
   world.time = RESET_MAX_TIME*2.0;
   world.last_use = 0.0;

   shader_route_register();
   shader_routeui_register();

   vg_acquire_thread_sync();
   {
      /* UI buffers */
      for( int i=0; i<vg_list_size(world.ui_bars); i++ )
      {
         /* OpenGL strips */
         struct route_ui_bar *pui = &world.ui_bars[i];

         glGenVertexArrays( 1, &pui->vao );
         glGenBuffers( 1, &pui->vbo );
         glGenBuffers( 1, &pui->ebo );
         glBindVertexArray( pui->vao );

         size_t stride = sizeof(v2f);

         glBindBuffer( GL_ARRAY_BUFFER, pui->vbo );
         glBufferData( GL_ARRAY_BUFFER, k_route_ui_max_verts*stride, 
                       NULL, GL_DYNAMIC_DRAW );

         glBindVertexArray( pui->vao );
         glBindBuffer( GL_ELEMENT_ARRAY_BUFFER, pui->ebo );
         glBufferData( GL_ELEMENT_ARRAY_BUFFER, 
               k_route_ui_max_indices*sizeof(u16), NULL,
               GL_DYNAMIC_DRAW );

         glVertexAttribPointer( 0, 2, GL_FLOAT, GL_FALSE, stride, (void *)0 );
         glEnableVertexAttribArray( 0 );
         VG_CHECK_GL_ERR();
      }
   }
   vg_release_thread_sync();
}

VG_STATIC void world_routes_update(void)
{
   world.time += vg.time_delta;

   for( int i=0; i<world.route_count; i++ )
   {
      struct route *route = &world.routes[i];
      route->factive = vg_lerpf( route->factive, route->active, 
                                 0.6f*vg.time_delta );

      if( route->active )
      {
         world_routes_ui_updatetime(i, world.time - route->latest_pass );
      }
   }
}

VG_STATIC void bind_terrain_textures(void);
VG_STATIC void render_world_routes( m4x4f projection, v3f camera )
{
   m4x3f identity_matrix;
   m4x3_identity( identity_matrix );

   shader_route_use();
   shader_route_uTexGarbage(0);
   shader_link_standard_ub( _shader_route.id, 2 );
   bind_terrain_textures();

   shader_route_uPv( projection );
   shader_route_uMdl( identity_matrix );
   shader_route_uCamera( camera );

   mesh_bind( &world.mesh_route_lines );

   for( int i=0; i<world.route_count; i++ )
   {
      struct route *route = &world.routes[i];

      v4f colour;
      v3_lerp( (v3f){0.7f,0.7f,0.7f}, route->colour, route->factive, colour );
      colour[3] = 1.0f;

      shader_route_uColour( colour );
      mdl_draw_submesh( &route->sm );
   }
}

VG_STATIC void render_world_routes_ui(void)
{
   glEnable(GL_BLEND);
   glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
   glBlendEquation(GL_FUNC_ADD);

   float active_offset = 0.0f;
   for( int i=0; i<world.route_count; i++ )
   {
      struct route *route = &world.routes[i];
      world_routes_ui_draw( i, route->colour, active_offset );
      active_offset += route->factive;
   }

   glDisable(GL_BLEND);
}

#endif /* ROUTES_H */