[carveJwlIkooP6JGAAIwe30JlM.git] / world_render.c

/*
 * Copyright (C) 2021-2023 Mt.ZERO Software, Harry Godden - All Rights Reserved
 */

#include "world.h"
#include "world_render.h"
#include "font.h"
#include "gui.h"
#include "world_map.h"
#include "ent_miniworld.h"
#include "player_remote.h"
#include "ent_skateshop.h"
#include "ent_npc.h"
#include "shaders/model_entity.h"

struct world_render world_render;

static int ccmd_set_time( int argc, const char *argv[] ){
   world_instance *world = world_current_instance();
   if( argc == 1 )
      world->time = atof( argv[0] );
   else 
      vg_error( "Usage set_time <0-1.0> (current time: %f)\n", world->time );
   return 0;
}

static void async_world_render_init( void *payload, u32 size ){
   vg_info( "Allocate uniform buffers\n" );
   for( int i=0; i<k_world_max; i++ ){
      world_instance *world = &world_static.instances[i];
      world->ubo_bind_point = i;

      glGenBuffers( 1, &world->ubo_lighting );
      glBindBuffer( GL_UNIFORM_BUFFER, world->ubo_lighting );
      glBufferData( GL_UNIFORM_BUFFER, sizeof(struct ub_world_lighting), 
                    NULL, GL_DYNAMIC_DRAW );

      glBindBufferBase( GL_UNIFORM_BUFFER, i, world->ubo_lighting );
      VG_CHECK_GL_ERR();
   }

   vg_info( "Allocate frame buffers\n" );
   for( int i=0; i<k_world_max; i++ ){
      world_instance *world = &world_static.instances[i];
      struct framebuffer *fb = &world->heightmap;

      fb->display_name = NULL;
      fb->link = NULL;
      fb->fixed_w = 1024;
      fb->fixed_h = 1024;
      fb->resolution_div = 0;

      fb->attachments[0].display_name     = NULL;
      fb->attachments[0].purpose = k_framebuffer_attachment_type_texture;
      fb->attachments[0].internalformat   = GL_RG16F;
      fb->attachments[0].format           = GL_RG;
      fb->attachments[0].type             = GL_FLOAT;
      fb->attachments[0].attachment       = GL_COLOR_ATTACHMENT0;

      fb->attachments[1].purpose = k_framebuffer_attachment_type_none;
      fb->attachments[2].purpose = k_framebuffer_attachment_type_none;
      fb->attachments[3].purpose = k_framebuffer_attachment_type_none;
      fb->attachments[4].purpose = k_framebuffer_attachment_type_none;

      render_fb_allocate( fb );
   }
}

void world_render_init(void)
{
   VG_VAR_F32( k_day_length );
   VG_VAR_I32( k_debug_light_indices );
   VG_VAR_I32( k_debug_light_complexity );
   VG_VAR_I32( k_light_preview );
   VG_VAR_I32( k_light_editor );
   vg_console_reg_cmd( "set_time", ccmd_set_time, NULL );

   world_render.sky_rate = 1.0;
   world_render.sky_target_rate = 1.0;

   vg_info( "Loading world resources\n" );
   vg_linear_clear( vg_mem.scratch );

   mdl_context msky;
   mdl_open( &msky, "models/rs_skydome.mdl", vg_mem.scratch );
   mdl_load_metadata_block( &msky, vg_mem.scratch );
   mdl_async_load_glmesh( &msky, &world_render.skydome, NULL );
   mdl_close( &msky );

   vg_info( "Loading default world textures\n" );
   vg_tex2d_load_qoi_async_file( "textures/garbage.qoi", 
                                 VG_TEX2D_NEAREST|VG_TEX2D_REPEAT, 
                                 &world_render.tex_terrain_noise );

   vg_async_call( async_world_render_init, NULL, 0 );
}

/* 
 * standard uniform bindings
 * ----------------------------------------------------------------------------
 */
void world_link_lighting_ub( world_instance *world, GLuint shader )
{
   GLuint idx = glGetUniformBlockIndex( shader, "ub_world_lighting" );   
   glUniformBlockBinding( shader, idx, world->ubo_bind_point );
}

void world_bind_position_texture( world_instance *world, 
                                  GLuint shader, GLuint location,
                                  int slot )
{
   render_fb_bind_texture( &world->heightmap, 0, slot );
   glUniform1i( location, slot );
}

void world_bind_light_array( world_instance *world,
                             GLuint shader, GLuint location, 
                             int slot )
{
   glActiveTexture( GL_TEXTURE0 + slot );
   glBindTexture( GL_TEXTURE_BUFFER, world->tex_light_entities );
   glUniform1i( location, slot );
}

void world_bind_light_index( world_instance *world,
                             GLuint shader, GLuint location,
                             int slot )
{
   glActiveTexture( GL_TEXTURE0 + slot );
   glBindTexture( GL_TEXTURE_3D, world->tex_light_cubes );
   glUniform1i( location, slot );
}

void bind_terrain_noise(void)
{
   glActiveTexture( GL_TEXTURE0 );
   glBindTexture( GL_TEXTURE_2D, world_render.tex_terrain_noise );
}

/* 
 * Get OpenGL texture name from texture ID.
 */
static GLuint world_get_texture( world_instance *world, u32 id ){
   if( id & 0x80000000 ) return skaterift.rt_textures[id & ~0x80000000];
   else                  return world->textures[ id ];
}

#if 0
static void bindpoint_diffuse_texture1( world_instance *world,
                                        struct world_surface *mat ){
   glActiveTexture( GL_TEXTURE1 );
   glBindTexture( GL_TEXTURE_2D, 
                  world_get_texture(world,mat->info.tex_diffuse) );
}
#endif

/*
 * Passes Rendering
 * ----------------------------------------------------------------------------
 */

struct world_pass
{
   vg_camera *cam;
   enum mdl_shader shader;
   enum world_geo_type geo_type;

   void (*fn_bind)( world_instance *world, struct world_surface *mat );
   void (*fn_set_mdl)( m4x3f mdl );
   void (*fn_set_uPvmPrev)( m4x4f pvm );
   void (*fn_set_uNormalMtx)( m3x3f mnorm );
};

void render_world_depth( world_instance *world, vg_camera *cam );

/*
 * Render a run of submeshes, only of those which match material_id
 */
static void world_render_submeshes( world_instance *world,
                                    struct world_pass *pass, 
                                    mdl_transform *transform, 
                                    u32 start, u32 count, u32 material_id )
{
   for( u32 k=0; k<count; k++ )
   {
      mdl_submesh *sm = mdl_arritm( &world->meta.submeshs, start+k );
      if( sm->material_id != material_id ) 
         continue;

      m4x3f mmdl;
      mdl_transform_m4x3( transform, mmdl );

      m4x4f m4mdl;
      m4x3_expand( mmdl, m4mdl );
      m4x4_mul( pass->cam->mtx_prev.pv, m4mdl, m4mdl );

      pass->fn_set_mdl( mmdl );
      pass->fn_set_uPvmPrev( m4mdl );

      mdl_draw_submesh( sm );
   }
}

/*
 * Render props attached to this material
 */
static void world_render_props( world_instance *world, u32 material_id,
                                struct world_pass *pass )
{
   struct world_surface *mat = &world->surfaces[ material_id ];
   if( !(mat->flags & WORLD_SURFACE_HAS_PROPS) ) return;

   pass->fn_bind( world, mat );

   for( u32 j=0; j<mdl_arrcount( &world->ent_prop ); j++ ){
      ent_prop *prop = mdl_arritm( &world->ent_prop, j );
      if( prop->flags & 0x1 ) continue;

      world_render_submeshes( world, pass, &prop->transform, 
            prop->submesh_start, prop->submesh_count, material_id );
   }
}

/*
 * Render traffic models attactched to this material
 */
static void world_render_traffic( world_instance *world, u32 material_id,
                                  struct world_pass *pass )
{
   struct world_surface *mat = &world->surfaces[ material_id ];
   if( !(mat->flags & WORLD_SURFACE_HAS_TRAFFIC) ) return;

   pass->fn_bind( world, mat );

   for( u32 j=0; j<mdl_arrcount( &world->ent_traffic ); j++ ){
      ent_traffic *traffic = mdl_arritm( &world->ent_traffic, j );

      world_render_submeshes( world, pass, &traffic->transform,
                              traffic->submesh_start, traffic->submesh_count,
                              material_id );
   }
}

/*
 * Iterate and render all materials which match the passes shader and geometry
 * type. Includes props/traffic.
 */
static void world_render_pass( world_instance *world, struct world_pass *pass )
{
   for( int i=0; i<world->surface_count; i++ )
   {
      struct world_surface *mat = &world->surfaces[i];

      if( mat->info.shader == pass->shader )
      {
         mdl_submesh *sm;

         if( pass->geo_type == k_world_geo_type_solid )
         {
            sm = &mat->sm_geo;
         }
         else
         {
            world_render_traffic( world, i, pass );
            world_render_props( world, i, pass );
            sm = &mat->sm_no_collide;
         }

         if( !sm->indice_count )
            continue;

         m4x3f mmdl;
         m4x3_identity( mmdl );
         pass->fn_set_mdl( mmdl );
         pass->fn_set_uPvmPrev( pass->cam->mtx_prev.pv );
         pass->fn_bind( world, mat );
         mdl_draw_submesh( sm );
      }
   }
}

/*
 * Specific shader instructions
 * ----------------------------------------------------------------------------
 */

static void world_render_both_stages( world_instance *world, 
                                      struct world_pass *pass )
{
   mesh_bind( &world->mesh_geo );
   pass->geo_type = k_world_geo_type_solid;
   world_render_pass( world, pass );

   glDisable( GL_CULL_FACE );
   mesh_bind( &world->mesh_no_collide );
   pass->geo_type = k_world_geo_type_nonsolid;
   world_render_pass( world, pass );
   glEnable( GL_CULL_FACE );
}

static void bindpoint_world_vb( world_instance *world,
                                struct world_surface *mat )
{
   struct shader_props_vertex_blend *props = mat->info.props.compiled;

   glActiveTexture( GL_TEXTURE1 );
   glBindTexture( GL_TEXTURE_2D, world_get_texture(world, props->tex_diffuse) );

#if 0
   shader_scene_vertex_blend_uOffset( props->blend_offset );
#endif
}

static void render_world_vb( world_instance *world, vg_camera *cam )
{
   shader_scene_vertex_blend_use();
   shader_scene_vertex_blend_uTexGarbage(0);
   shader_scene_vertex_blend_uTexGradients(1);
   WORLD_BIND_LIGHT_BUFFERS_UB0_TEX234( world, scene_vertex_blend );

   glActiveTexture( GL_TEXTURE0 );
   glBindTexture( GL_TEXTURE_2D, world_render.tex_terrain_noise );

   shader_scene_vertex_blend_uPv( cam->mtx.pv );
   shader_scene_vertex_blend_uCamera( cam->transform[3] );

   struct world_pass pass = 
   {
      .shader = k_shader_standard_vertex_blend,
      .cam = cam,
      .fn_bind = bindpoint_world_vb,
      .fn_set_mdl = shader_scene_vertex_blend_uMdl,
      .fn_set_uPvmPrev = shader_scene_vertex_blend_uPvmPrev,
   };

   world_render_both_stages( world, &pass );
}

static void world_shader_standard_bind( world_instance *world, vg_camera *cam )
{
   shader_scene_standard_use();
   shader_scene_standard_uTexGarbage(0);
   shader_scene_standard_uTexMain(1);
   shader_scene_standard_uPv( cam->mtx.pv );
   WORLD_BIND_LIGHT_BUFFERS_UB0_TEX234( world, scene_standard );

   bind_terrain_noise();
   shader_scene_standard_uCamera( cam->transform[3] );
}

static void bindpoint_standard( world_instance *world, 
                                struct world_surface *mat )
{
   struct shader_props_standard *props = mat->info.props.compiled;

   glActiveTexture( GL_TEXTURE1 );
   glBindTexture( GL_TEXTURE_2D, world_get_texture(world, props->tex_diffuse) );
}

static void render_world_standard( world_instance *world, vg_camera *cam )
{
   world_shader_standard_bind( world, cam );
   struct world_pass pass = 
   {
      .shader = k_shader_standard,
      .cam = cam,
      .fn_bind = bindpoint_standard,
      .fn_set_mdl = shader_scene_standard_uMdl,
      .fn_set_uPvmPrev = shader_scene_standard_uPvmPrev,
   };

   world_render_both_stages( world, &pass );
}

static void bindpoint_world_cubemapped( world_instance *world,
                                        struct world_surface *mat )
{
   struct shader_props_cubemapped *props = mat->info.props.compiled;

   glActiveTexture( GL_TEXTURE1 );
   glBindTexture( GL_TEXTURE_2D, 
                  world_get_texture( world,props->tex_diffuse ) );

   u32 cubemap_id = props->cubemap_entity,
       cubemap_index = 0;

   if( mdl_entity_id_type( cubemap_id ) == k_ent_cubemap )
   {
      cubemap_index = mdl_entity_id_id( cubemap_id );
   }

   ent_cubemap *cm = mdl_arritm( &world->ent_cubemap, cubemap_index );
   glActiveTexture( GL_TEXTURE10 );
   glBindTexture( GL_TEXTURE_CUBE_MAP, cm->texture_id );

   shader_scene_cubemapped_uColour( props->tint );
}

static void bindpoint_world_cubemapped_disabled( world_instance *world,
                                                 struct world_surface *mat )
{
   struct shader_props_cubemapped *props = mat->info.props.compiled;

   glActiveTexture( GL_TEXTURE1 );
   glBindTexture( GL_TEXTURE_2D, 
                  world_get_texture( world, props->tex_diffuse ) );
}

static void render_world_cubemapped( world_instance *world, vg_camera *cam,
                                     int enabled )
{
   if( !mdl_arrcount( &world->ent_cubemap ) )
      return;

   if( !enabled )
   {
      world_shader_standard_bind( world, cam );

      struct world_pass pass = 
      {
         .shader = k_shader_cubemap,
         .cam = cam,
         .fn_bind = bindpoint_world_cubemapped_disabled,
         .fn_set_mdl = shader_scene_standard_uMdl,
         .fn_set_uPvmPrev = shader_scene_standard_uPvmPrev,
      };

      world_render_both_stages( world, &pass );
   }
   else 
   {
      shader_scene_cubemapped_use();
      shader_scene_cubemapped_uTexGarbage(0);
      shader_scene_cubemapped_uTexMain(1);
      shader_scene_cubemapped_uTexCubemap(10);
      shader_scene_cubemapped_uPv( cam->mtx.pv );

      WORLD_BIND_LIGHT_BUFFERS_UB0_TEX234( world, scene_cubemapped );

      bind_terrain_noise();
      shader_scene_cubemapped_uCamera( cam->transform[3] );
      
      struct world_pass pass = 
      {
         .shader = k_shader_cubemap,
         .cam = cam,
         .fn_bind = bindpoint_world_cubemapped,
         .fn_set_mdl = shader_scene_cubemapped_uMdl,
         .fn_set_uPvmPrev = shader_scene_cubemapped_uPvmPrev,
      };

      world_render_both_stages( world, &pass );
   }
}

static void render_world_alphatest( world_instance *world, vg_camera *cam )
{
   shader_scene_standard_alphatest_use();
   shader_scene_standard_alphatest_uTexGarbage(0);
   shader_scene_standard_alphatest_uTexMain(1);
   shader_scene_standard_alphatest_uPv( cam->mtx.pv );

   WORLD_BIND_LIGHT_BUFFERS_UB0_TEX234( world, scene_standard_alphatest );

   bind_terrain_noise();
   shader_scene_standard_alphatest_uCamera( cam->transform[3] );
   glDisable(GL_CULL_FACE);

   struct world_pass pass = 
   {
      .shader = k_shader_standard_cutout,
      .cam = cam,
      .fn_bind = bindpoint_standard,
      .fn_set_mdl = shader_scene_standard_alphatest_uMdl,
      .fn_set_uPvmPrev = shader_scene_standard_alphatest_uPvmPrev,
   };

   world_render_both_stages( world, &pass );
   glEnable(GL_CULL_FACE);
}

static void render_world_foliage( world_instance *world, vg_camera *cam )
{
   shader_scene_foliage_use();
   shader_scene_foliage_uTexGarbage(0);
   shader_scene_foliage_uTexMain(1);
   shader_scene_foliage_uPv( cam->mtx.pv );
   shader_scene_foliage_uTime( vg.time );

   WORLD_BIND_LIGHT_BUFFERS_UB0_TEX234( world, scene_foliage );
   bind_terrain_noise();

   shader_scene_foliage_uCamera( cam->transform[3] );
   glDisable(GL_CULL_FACE);
   struct world_pass pass = 
   {
      .shader = k_shader_foliage,
      .cam = cam,
      .fn_bind = bindpoint_standard,
      .fn_set_mdl = shader_scene_foliage_uMdl,
      .fn_set_uPvmPrev = shader_scene_foliage_uPvmPrev,
   };
   world_render_both_stages( world, &pass );
   glEnable(GL_CULL_FACE);
}

static void world_render_challenges( world_instance *world, 
                                     struct world_pass *pass, v3f pos )
{
   if( !world ) return;
   if( skaterift.activity == k_skaterift_replay ) return;
   if( world != world_current_instance() ) return;

   /* sort lists */
   f32 radius = 40.0f;

   u32 objective_list[ 32 ],
       challenge_list[ 16 ];

   v2f objective_uv_offsets[ 32 ];

   u32 objective_count = 0,
       challenge_count = 0;

   ent_challenge *active_challenge = NULL;
   int running = 0;
   if( mdl_entity_id_type( world_static.focused_entity ) == k_ent_challenge ){
      if( (skaterift.activity == k_skaterift_default) &&
           world_static.challenge_target ){
         running = 1;
      }

      if( !((skaterift.activity != k_skaterift_ent_focus) &&
            !world_static.challenge_target) ){
         world_instance *challenge_world = world_current_instance();
         u32 index = mdl_entity_id_id( world_static.focused_entity );
         active_challenge = mdl_arritm(&challenge_world->ent_challenge, index);
      }
   }

   if( active_challenge ){
      shader_scene_fxglow_uUvOffset( (v2f){ 8.0f/256.0f, 0.0f } );
      challenge_list[ challenge_count ++ ] = world_static.focused_entity;

      u32 next = active_challenge->first;
      while( mdl_entity_id_type(next) == k_ent_objective ){
         u32 index = mdl_entity_id_id( next );
         objective_list[ objective_count ++ ] = index;

         ent_objective *objective = mdl_arritm( &world->ent_objective, index );
         next = objective->id_next;
      }

      radius = 10000.0f;
   }
   else {
      shader_scene_fxglow_uUvOffset( (v2f){ 0.0f, 0.0f } );
      bh_iter it;
      bh_iter_init_range( 0, &it, pos, radius+10.0f );
      i32 idx;
      while( bh_next( world->entity_bh, &it, &idx ) ){
         u32 id    = world->entity_list[ idx ],
             type  = mdl_entity_id_type( id ),
             index = mdl_entity_id_id( id );

         if( type == k_ent_objective ) {
            if( objective_count < vg_list_size(objective_list) )
               objective_list[ objective_count ++ ] = index;
         }
         else if( type == k_ent_challenge ){
            if( challenge_count < vg_list_size(challenge_list) )
               challenge_list[ challenge_count ++ ] = index;
         }
      }
   }

   /* render objectives */
   glDisable( GL_CULL_FACE );
   mesh_bind( &world->mesh_no_collide );
   u32 last_material = 0;
   for( u32 i=0; i<objective_count; i++ )
   {
      u32 index = objective_list[ i ];
      ent_objective *objective = mdl_arritm( &world->ent_objective, index );
      if( (objective->flags & k_ent_objective_hidden) &&
          !active_challenge ) continue;

      f32 scale = 1.0f;

      if( running )
      {
         u32 passed = objective->flags & k_ent_objective_passed;
         f32 target = passed? 0.0f: 1.0f;
         vg_slewf(&objective->transform.s[0], target, vg.time_frame_delta*4.0f);
         scale = vg_smoothstepf( objective->transform.s[0] );

         if( (objective == world_static.challenge_target) || passed )
            shader_scene_fxglow_uUvOffset( (v2f){ 16.0f/256.0f, 0.0f } );
         else
            shader_scene_fxglow_uUvOffset( (v2f){ 8.0f/256.0f, 0.0f } );
      }
      else 
      {
         f32 dist = v3_dist( objective->transform.co, pos ) * (1.0f/radius);
         scale = vg_smoothstepf( vg_clampf( 5.0f-dist*5.0f, 0.0f,1.0f ) );
      }

      m4x3f mmdl;
      q_m3x3( objective->transform.q, mmdl );
      m3x3_scalef( mmdl, scale );
      v3_copy( objective->transform.co, mmdl[3] );
      shader_scene_fxglow_uMdl( mmdl );

      for( u32 j=0; j<objective->submesh_count; j++ )
      {
         mdl_submesh *sm = mdl_arritm( &world->meta.submeshs, 
                                       objective->submesh_start + j );

         if( sm->material_id != last_material )
         {
            last_material = sm->material_id;
            pass->fn_bind( world, &world->surfaces[sm->material_id] );
         }
         mdl_draw_submesh( sm );
      }
   }

   /* render texts */
   font3d_bind( &gui.font, k_font_shader_world, 0, world, &skaterift.cam );

   u32 count = 0;

   for( u32 i=0; i<mdl_arrcount(&world->ent_challenge); i++ )
   {
      ent_challenge *challenge = mdl_arritm( &world->ent_challenge, i );
      if( challenge->status ) count ++;
   }

   char buf[32];
   vg_str str;
   vg_strnull( &str, buf, sizeof(buf) );
   vg_strcati32( &str, count );
   vg_strcatch( &str, '/' );
   vg_strcati32( &str, mdl_arrcount(&world->ent_challenge) );

   f32 w = font3d_string_width( 1, buf );
   m4x3f mlocal;
   m3x3_identity( mlocal );
   mlocal[3][0] = -w*0.5f;
   mlocal[3][1] = 0.0f;
   mlocal[3][2] = 0.0f;

   for( u32 i=0; i<challenge_count; i++ )
   {
      u32 index = challenge_list[ i ];
      ent_challenge *challenge = mdl_arritm( &world->ent_challenge, index );
      m4x3f mmdl;
      mdl_transform_m4x3( &challenge->transform, mmdl );
      m4x3_mul( mmdl, mlocal, mmdl );

      vg_line_point( challenge->transform.co, 0.25f, VG__RED );

      f32 dist = v3_dist( challenge->transform.co, pos ) * (1.0f/radius),
          scale = vg_smoothstepf( vg_clampf( 10.0f-dist*10.0f, 0.0f,1.0f ) ),
          colour = 0.0f;

      if( challenge->status )
         colour = 1.0f;

      shader_scene_font_uOpacity( scale );
      shader_scene_font_uColourize( colour );
      font3d_simple_draw( 1, buf, &skaterift.cam, mmdl );
   }
}

static void bindpoint_fxglow( world_instance *world,
                              struct world_surface *mat )
{
   struct shader_props_standard *props = mat->info.props.compiled;

   glActiveTexture( GL_TEXTURE1 );
   glBindTexture( GL_TEXTURE_2D, world_get_texture(world, props->tex_diffuse) );
}

static void render_world_fxglow( world_instance *host_world, 
                                 world_instance *world, vg_camera *cam,
                                 m4x3f world_mmdl,
                                 int generic, int challenges, int regions )
{
   shader_scene_fxglow_use();
   shader_scene_fxglow_uUvOffset( (v2f){ 0.0f, 0.0f } );
   shader_scene_fxglow_uTexMain(1);
   shader_scene_fxglow_uPv( cam->mtx.pv );
   WORLD_BIND_LIGHT_BUFFERS_UB0_TEX234( world, scene_fxglow );

   shader_scene_fxglow_uCamera( cam->transform[3] );
   glDisable(GL_CULL_FACE);

   struct world_pass pass = 
   {
      .shader = k_shader_fxglow,
      .cam = cam,
      .fn_bind = bindpoint_fxglow,
      .fn_set_mdl = shader_scene_fxglow_uMdl,
      .fn_set_uPvmPrev = shader_scene_fxglow_uPvmPrev,
   };

   if( generic )
      world_render_both_stages( world, &pass );

   if( regions ){
      mesh_bind( &world->mesh_no_collide );

      u32 last_material = 0;
      for( u32 i=0; i<mdl_arrcount(&world->ent_region); i ++ ){
         shader_scene_fxglow_uUvOffset( (v2f){ 0.0f, 0.0f } );
         ent_region *region = mdl_arritm( &world->ent_region, i );

         f32 offset = 0.0f;
         if( region->flags & k_ent_route_flag_achieve_gold )
            offset = 2.0f;
         else if( region->flags & k_ent_route_flag_achieve_silver )
            offset = 1.0f;

         shader_scene_fxglow_uUvOffset( (v2f){ (8.0f/256.0f)*offset, 0.0f } );

         m4x3f mmdl;
         mdl_transform_m4x3( &region->transform, mmdl );
         m4x3_mul( world_mmdl, mmdl, mmdl );
         shader_scene_fxglow_uMdl( mmdl );

         for( u32 j=0; j<region->submesh_count; j++ )
         {
            mdl_submesh *sm = mdl_arritm( &world->meta.submeshs, 
                                          region->submesh_start + j );

            if( sm->material_id != last_material )
            {
               last_material = sm->material_id;
               pass.fn_bind( world, &world->surfaces[sm->material_id] );
            }
            mdl_draw_submesh( sm );
         }
      }
   }

   if( challenges )
      world_render_challenges( world, &pass, cam->pos );

   glEnable(GL_CULL_FACE);
}

static void bindpoint_terrain( world_instance *world,
                               struct world_surface *mat )
{
   struct shader_props_terrain *props = mat->info.props.compiled;

   glActiveTexture( GL_TEXTURE1 );
   glBindTexture( GL_TEXTURE_2D, world_get_texture(world, props->tex_diffuse) );
   shader_scene_terrain_uBlendOffset( props->blend_offset );
   shader_scene_terrain_uSandColour( props->sand_colour );
}

static void bindpoint_override( world_instance *world,
                                   struct world_surface *mat )
{
   if( mat->info.flags & k_material_flag_collision )
   {
      shader_scene_override_uAlphatest(0);
   }
   else
   {
      glActiveTexture( GL_TEXTURE1 );
      glBindTexture( GL_TEXTURE_2D, world_get_texture(world, mat->alpha_tex) );
      shader_scene_override_uAlphatest(1);
   }
}

static void render_terrain( world_instance *world, vg_camera *cam )
{
   shader_scene_terrain_use();
   shader_scene_terrain_uTexGarbage(0);
   shader_scene_terrain_uTexGradients(1);

   WORLD_BIND_LIGHT_BUFFERS_UB0_TEX234( world, scene_terrain );
   glActiveTexture( GL_TEXTURE0 );
   glBindTexture( GL_TEXTURE_2D, world_render.tex_terrain_noise );

   shader_scene_terrain_uPv( cam->mtx.pv );
   shader_scene_terrain_uCamera( cam->transform[3] );

   struct world_pass pass = 
   {
      .shader = k_shader_terrain_blend,
      .cam = cam,
      .fn_bind = bindpoint_terrain,
      .fn_set_mdl = shader_scene_terrain_uMdl,
      .fn_set_uPvmPrev = shader_scene_terrain_uPvmPrev,
   };

   world_render_both_stages( world, &pass );
}

static void render_sky( world_instance *world, vg_camera *cam )
{
   /* 
    * Modify matrix to remove clipping and view translation
    */
   m4x4f v,
         v_prev,
         pv,
         pv_prev;

   m4x4_copy( cam->mtx.v, v );
   m4x4_copy( cam->mtx_prev.v, v_prev );

   for( int i=0; i<3; i++ ){
      v3_normalize(v[i]);
      v3_normalize(v_prev[i]);
   }
   v3_zero( v[3] );
   v3_zero( v_prev[3] );

   m4x4_copy( cam->mtx.p,      pv );
   m4x4_copy( cam->mtx_prev.p, pv_prev );
   m4x4_reset_clipping( pv,      100.0f, 0.1f );
   m4x4_reset_clipping( pv_prev, 100.0f, 0.1f );

   m4x4_mul( pv,      v,      pv );
   m4x4_mul( pv_prev, v_prev, pv_prev );

   m4x3f identity_matrix;
   m4x3_identity( identity_matrix );
   
   /*
    * Draw
    */
   if( world->skybox == k_skybox_default ){
      shader_model_sky_use();
      shader_model_sky_uMdl( identity_matrix );
      shader_model_sky_uPv( pv );
      shader_model_sky_uPvmPrev( pv_prev );
      shader_model_sky_uTexGarbage(0);
      world_link_lighting_ub( world, _shader_model_sky.id );

      glActiveTexture( GL_TEXTURE0 );
      glBindTexture( GL_TEXTURE_2D, world_render.tex_terrain_noise );
   }
   else if( world->skybox == k_skybox_space ){
      shader_model_sky_space_use();

      shader_model_sky_space_uMdl( identity_matrix );
      shader_model_sky_space_uPv( pv );
      shader_model_sky_space_uPvmPrev( pv_prev );
      shader_model_sky_space_uTexGarbage(0);
      world_link_lighting_ub( world, _shader_model_sky_space.id );

      glActiveTexture( GL_TEXTURE0 );
      glBindTexture( GL_TEXTURE_2D, world_render.tex_terrain_noise );
   }
   else {
      vg_fatal_error( "Programming error\n" );
   }

   glDepthMask( GL_FALSE );
   glDisable( GL_DEPTH_TEST );

   mesh_bind( &world_render.skydome );
   mesh_draw( &world_render.skydome );
   
   glEnable( GL_DEPTH_TEST );
   glDepthMask( GL_TRUE );
}

void render_world_gates( world_instance *world, vg_camera *cam )
{
   float closest = INFINITY;
   struct ent_gate *gate = NULL;

   for( u32 i=0; i<mdl_arrcount(&world->ent_gate); i++ ){
      ent_gate *gi = mdl_arritm( &world->ent_gate, i );

      if( !(gi->flags & k_ent_gate_nonlocal) )
         if( !(gi->flags & k_ent_gate_linked) )
            continue;

      float dist = v3_dist2( gi->co[0], cam->transform[3] );

      vg_line_point( gi->co[0], 0.25f, VG__BLUE );

      if( dist < closest ){
         closest = dist;
         gate = gi;
      }
   }
   
   world->rendering_gate = gate;

   if( gate ){
      if( gate->flags & k_ent_gate_locked ){
         world->rendering_gate = NULL;
         return;
      }

      if( gate->flags & k_ent_gate_nonlocal ){
         if( !(gate->flags & k_ent_gate_linked) ||
             (world_static.load_state != k_world_loader_none) ){
            world->rendering_gate = NULL;
            render_gate_unlinked( world, gate, cam );
            return;
         }

         world_instance *dest_world = &world_static.instances[ gate->target ];
         render_gate( world, dest_world, gate, cam );
      }
      else
         render_gate( world, world, gate, cam );
   }
}

void world_prerender( world_instance *world )
{
   if( mdl_arrcount( &world->ent_light ) ){
      f32 rate = vg_maxf(0.1f, fabsf(k_day_length)) * vg_signf(k_day_length);
      world->time += vg.time_frame_delta * (1.0/(rate*60.0));
   }
   else{
      world->time = 0.834;
   }

   if( world->info.flags & 0x1 ){
      world->time = world->info.timezone;
   }

   struct ub_world_lighting *state = &world->ub_lighting;

   state->g_time = world->time;
   state->g_realtime = vg.time_real;
   state->g_debug_indices = k_debug_light_indices;
   state->g_light_preview = k_light_preview;
   state->g_debug_complexity = k_debug_light_complexity;
   state->g_time_of_day = vg_fractf( world->time );

   if( vg.quality_profile == k_quality_profile_high )
      state->g_shadow_samples = 8;
   else if( vg.quality_profile == k_quality_profile_low )
      state->g_shadow_samples = 2;
   else
      state->g_shadow_samples = 0;

   state->g_day_phase   = cosf( state->g_time_of_day * VG_PIf * 2.0f );
   state->g_sunset_phase= cosf( state->g_time_of_day * VG_PIf * 4.0f + VG_PIf );

   state->g_day_phase    =       state->g_day_phase    * 0.5f + 0.5f;
   state->g_sunset_phase = powf( state->g_sunset_phase * 0.5f + 0.5f, 6.0f );

   float a = state->g_time_of_day * VG_PIf * 2.0f;
   state->g_sun_dir[0] = sinf( a );
   state->g_sun_dir[1] = cosf( a );
   state->g_sun_dir[2] = 0.2f;
   v3_normalize( state->g_sun_dir );

   world->probabilities[ k_probability_curve_constant ] = 1.0f;
   float dp = state->g_day_phase;

   world->probabilities[ k_probability_curve_wildlife_day ] =
      (dp*dp*0.8f+state->g_sunset_phase)*0.8f;
   world->probabilities[ k_probability_curve_wildlife_night ] = 
      1.0f-powf(fabsf((state->g_time_of_day-0.5f)*5.0f),5.0f);
      
   glBindBuffer( GL_UNIFORM_BUFFER, world->ubo_lighting );
   glBufferSubData( GL_UNIFORM_BUFFER, 0, 
                    sizeof(struct ub_world_lighting), &world->ub_lighting );
}

static void render_other_entities( world_instance *world, vg_camera *cam )
{
   f32 radius = 40.0f;
   bh_iter it;
   bh_iter_init_range( 0, &it, cam->pos, radius+10.0f );

   u32 glider_list[4],
       glider_count = 0,
       npc_list[4],
       npc_count = 0;

   i32 idx;
   while( bh_next( world->entity_bh, &it, &idx ) ){
      u32 id    = world->entity_list[ idx ],
          type  = mdl_entity_id_type( id ),
          index = mdl_entity_id_id( id );

      if( type == k_ent_glider ) 
      {
         if( glider_count < vg_list_size(glider_list) )
            glider_list[ glider_count ++ ] = index;
      }
      else if( type == k_ent_npc ) 
      {
         if( npc_count < vg_list_size(npc_list) )
            npc_list[ npc_count ++ ] = index;
      }
   }

   shader_model_entity_use();
   shader_model_entity_uTexMain( 0 );
   shader_model_entity_uCamera( cam->transform[3] );
   shader_model_entity_uPv( cam->mtx.pv );
   WORLD_BIND_LIGHT_BUFFERS_UB0_TEX234( world, model_entity );

   for( u32 j=0; j<glider_count; j ++ )
   {
      ent_glider *glider = mdl_arritm( &world->ent_glider, glider_list[j] );

      if( !(glider->flags & 0x1) )
         continue;

      m4x3f mdl;
      mdl_transform_m4x3( &glider->transform, mdl );

      f32 dist  = v3_dist( glider->transform.co, cam->pos ) * (1.0f/radius),
          scale = vg_smoothstepf( vg_clampf( 5.0f-dist*5.0f, 0.0f,1.0f ) );
      m3x3_scalef( mdl, scale );

      render_glider_model( cam, world, mdl, k_board_shader_entity );
   }

   for( u32 j=0; j<npc_count; j ++ )
   {
      u32 index = npc_list[j];
      ent_npc *npc = mdl_arritm( &world->ent_npc, npc_list[j] );
      npc_update( npc );
      npc_render( npc, world, cam );
   }
}

void render_world( world_instance *world, vg_camera *cam,
                   int stenciled, int viewing_from_gate, 
                   int with_water, int with_cubemaps )
{
   if( stenciled ){
      glClear( GL_DEPTH_BUFFER_BIT );
      glStencilFunc( GL_EQUAL, 1, 0xFF );
      glStencilMask( 0x00 ); 
      glEnable( GL_CULL_FACE );
      glEnable( GL_STENCIL_TEST );
   }
   else {
      glStencilMask( 0xFF );
      glStencilFunc( GL_ALWAYS, 1, 0xFF );
      glDisable( GL_STENCIL_TEST );
   }

   render_sky( world, cam );

   m4x3f identity;
   m4x3_identity(identity);
   render_world_routes( world, world, identity, cam, viewing_from_gate, 0 );
   render_world_standard( world, cam );
   render_world_cubemapped( world, cam, with_cubemaps );

   render_world_vb( world, cam );
   render_world_alphatest( world, cam );
   render_world_foliage( world, cam );
   render_terrain( world, cam );

   if( !viewing_from_gate ){
      world_entity_focus_render();

      /* Render SFD's */
      u32 closest = 0;
      float min_dist = INFINITY;

      if( mdl_arrcount( &world->ent_route ) ){
         for( u32 i=0; i<mdl_arrcount( &world->ent_route ); i++ ){
            ent_route *route = mdl_arritm( &world->ent_route, i );
            float dist = v3_dist2( route->board_transform[3], cam->pos );

            if( dist < min_dist ){
               min_dist = dist;
               closest = i;
            }
         }

         ent_route *route = mdl_arritm( &world->ent_route, closest );
         sfd_render( world, cam, route->board_transform );
      }
   }

   if( !viewing_from_gate ){
      f32 greyout = 0.0f;
      if( mdl_entity_id_type(world_static.focused_entity) == k_ent_challenge )
         greyout = world_static.focus_strength;

      if( greyout > 0.0f ){
         glDrawBuffers( 1, (GLenum[]){ GL_COLOR_ATTACHMENT0 } );
         glEnable(GL_BLEND);
         glDisable(GL_DEPTH_TEST);
         glDepthMask(GL_FALSE);
         glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
         glBlendEquation(GL_FUNC_ADD);

         shader_blitcolour_use();
         shader_blitcolour_uColour( (v4f){ 0.5f, 0.5f, 0.5f, greyout*0.56f } );
         render_fsquad();
         
         glDisable(GL_BLEND);
         glEnable(GL_DEPTH_TEST);
         glDepthMask(GL_TRUE);
         glDrawBuffers( 2, (GLenum[]){ GL_COLOR_ATTACHMENT0, 
                                       GL_COLOR_ATTACHMENT1 } );
      }

      render_world_fxglow( world, world, cam, NULL, 1, 1, 0 );
   }
   
   if( with_water ){
      render_water_texture( world, cam );
      render_fb_bind( gpipeline.fb_main, 1 );
   }

   if( stenciled ){
      glStencilFunc( GL_EQUAL, 1, 0xFF );
      glStencilMask( 0x00 ); 
      glEnable( GL_CULL_FACE );
      glEnable( GL_STENCIL_TEST );
   }

   if( with_water ){
      render_water_surface( world, cam );
   }

   render_remote_players( world, cam );
   render_other_entities( world, cam );
   ent_miniworld_render( world, cam );

   if( stenciled ){
      glStencilMask( 0xFF );
      glStencilFunc( GL_ALWAYS, 1, 0xFF );
      glDisable( GL_STENCIL_TEST );
   }
}


static void render_world_override_pass( world_instance *world,
                                        struct world_pass *pass,
                                        m4x3f mmdl, m3x3f mnormal,
                                        m4x4f mpvm_prev )
{
   for( int i=0; i<world->surface_count; i++ )
   {
      struct world_surface *mat = &world->surfaces[i];
      if( mat->info.flags & k_material_flag_ghosts ) continue;

      mdl_submesh *sm;
      if( pass->geo_type == k_world_geo_type_solid )
         sm = &mat->sm_geo;
      else
         sm = &mat->sm_no_collide;

      if( !sm->indice_count )
         continue;

      pass->fn_set_mdl( mmdl );
      pass->fn_set_uNormalMtx( mnormal );
      pass->fn_set_uPvmPrev( mpvm_prev );
      pass->fn_bind( world, mat );
      mdl_draw_submesh( sm );
   }
}

void render_world_override( world_instance *world,
                            world_instance *lighting_source,
                            m4x3f mmdl,
                            vg_camera *cam,
                            ent_spawn *dest_spawn, v4f map_info )
{
   struct world_pass pass = 
   {
      .cam = cam,
      .fn_bind = bindpoint_override,
      .fn_set_mdl = shader_scene_override_uMdl,
      .fn_set_uPvmPrev = shader_scene_override_uPvmPrev,
      .fn_set_uNormalMtx = shader_scene_override_uNormalMtx,
      .shader = k_shader_override
   };

   shader_scene_override_use();
   shader_scene_override_uTexGarbage(0);
   shader_scene_override_uTexMain(1);
   shader_scene_override_uPv( pass.cam->mtx.pv );
   shader_scene_override_uMapInfo( map_info );

   WORLD_BIND_LIGHT_BUFFERS_UB0_TEX234( lighting_source, scene_override );
   bind_terrain_noise();

   shader_scene_override_uCamera( pass.cam->transform[3] );

   m4x4f mpvm_prev;
   m4x3_expand( mmdl, mpvm_prev );
   m4x4_mul( cam->mtx_prev.pv, mpvm_prev, mpvm_prev );

   m3x3f mnormal;
   m3x3_inv( mmdl, mnormal );
   m3x3_transpose( mnormal, mnormal );
   v3_normalize( mnormal[0] );
   v3_normalize( mnormal[1] );
   v3_normalize( mnormal[2] );

   v4f uPlayerPos, uSpawnPos;
   v4_zero( uPlayerPos );
   v4_zero( uSpawnPos );

   v3_copy( world->player_co, uPlayerPos );
   
   if( dest_spawn && (v3_dist2(dest_spawn->transform.co,uPlayerPos) > 0.1f) )
      v3_copy( dest_spawn->transform.co, uSpawnPos );
   else
      v3_add( uPlayerPos, (v3f){0,-1,0}, uSpawnPos );

   uPlayerPos[3] = v3_dist(uPlayerPos,uSpawnPos);
   uSpawnPos[3] = 1.0f/uPlayerPos[3];

   shader_scene_override_uPlayerPos( uPlayerPos );
   shader_scene_override_uSpawnPos( uSpawnPos );


   glDisable( GL_CULL_FACE );
   mesh_bind( &world->mesh_geo );
   pass.geo_type = k_world_geo_type_solid;
   render_world_override_pass( world, &pass, mmdl, mnormal, mpvm_prev );
   mesh_bind( &world->mesh_no_collide );
   pass.geo_type = k_world_geo_type_nonsolid;
   render_world_override_pass( world, &pass, mmdl, mnormal, mpvm_prev );
   glEnable( GL_CULL_FACE );

   render_world_fxglow( world, world, cam, mmdl, 0, 0, 1 );
}

static void render_cubemap_side( world_instance *world, ent_cubemap *cm, 
                                    u32 side ){
   vg_camera cam;
   glFramebufferTexture2D( GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
         GL_TEXTURE_CUBE_MAP_POSITIVE_X + side, cm->texture_id, 0 );
   glClear( GL_DEPTH_BUFFER_BIT );

   v3f forward[6] = {
      { -1.0f,  0.0f,  0.0f },
      {  1.0f,  0.0f,  0.0f },
      {  0.0f, -1.0f,  0.0f },
      {  0.0f,  1.0f,  0.0f },
      {  0.0f,  0.0f, -1.0f },
      {  0.0f,  0.0f,  1.0f }
   };
   v3f up[6] = {
      { 0.0f, -1.0f,  0.0f },
      { 0.0f, -1.0f,  0.0f },
      { 0.0f,  0.0f,  1.0f },
      { 0.0f,  0.0f, -1.0f },
      { 0.0f, -1.0f,  0.0f },
      { 0.0f, -1.0f,  0.0f }
   };

   v3_zero( cam.angles );
   v3_copy( cm->co, cam.pos );

   v3_copy( forward[side], cam.transform[2] );
   v3_copy( up[side], cam.transform[1] );
   v3_cross( up[side], forward[side], cam.transform[0] );
   v3_copy( cm->co, cam.transform[3] );
   m4x3_invert_affine( cam.transform, cam.transform_inverse );

   vg_camera_update_view( &cam );

   cam.nearz = 0.1f;
   cam.farz = 1000.0f;
   cam.fov = 90.0f;
   m4x4_copy( cam.mtx.p,  cam.mtx_prev.p );
   m4x4_projection( cam.mtx.p, cam.fov, 1.0f, cam.nearz, cam.farz );
   vg_camera_finalize( &cam );
   vg_camera_finalize( &cam );

   render_world( world, &cam, 0, 1, 1, 0 );
}

void render_world_cubemaps( world_instance *world )
{
   if( world->cubemap_cooldown )
      world->cubemap_cooldown --;
   else{
      world->cubemap_cooldown = 60;

      glViewport( 0, 0, WORLD_CUBEMAP_RES, WORLD_CUBEMAP_RES );
      for( u32 i=0; i<mdl_arrcount( &world->ent_cubemap ); i++ ){
         ent_cubemap *cm = mdl_arritm( &world->ent_cubemap, i );
         glBindFramebuffer( GL_FRAMEBUFFER, cm->framebuffer_id );

         world->cubemap_side ++;
         if( world->cubemap_side >= 6 )
            world->cubemap_side = 0;

         render_cubemap_side( world, cm, world->cubemap_side );
      }
   }
}

/*
 * Geo shaders
 * ---------------------------------------------
 */

void render_world_depth( world_instance *world, vg_camera *cam )
{
   m4x3f identity_matrix;
   m4x3_identity( identity_matrix );

   shader_scene_depth_use();
   shader_scene_depth_uCamera( cam->transform[3] );
   shader_scene_depth_uPv( cam->mtx.pv );
   shader_scene_depth_uPvmPrev( cam->mtx_prev.pv );
   shader_scene_depth_uMdl( identity_matrix );
   world_link_lighting_ub( world, _shader_scene_depth.id );

   mesh_bind( &world->mesh_geo );
   mesh_draw( &world->mesh_geo );
}

void render_world_position( world_instance *world, vg_camera *cam )
{
   m4x3f identity_matrix;
   m4x3_identity( identity_matrix );

   shader_scene_position_use();
   shader_scene_position_uCamera( cam->transform[3] );
   shader_scene_position_uPv( cam->mtx.pv );
   shader_scene_position_uPvmPrev( cam->mtx_prev.pv );
   shader_scene_position_uMdl( identity_matrix );
   world_link_lighting_ub( world, _shader_scene_position.id );

   mesh_bind( &world->mesh_geo );
   mesh_draw( &world->mesh_geo );
}

struct ui_enum_opt skybox_setting_options[] = { 
   { 0, "g_daysky_colour" },
   { 1, "g_nightsky_colour" },
   { 2, "g_sunset_colour" },
   { 3, "g_ambient_colour" },
   { 4, "g_sun_colour" },
};

static f32 *skybox_prop_location( world_instance *world, i32 index ){
   switch( index ){
      case 0: return world->ub_lighting.g_daysky_colour; break;
      case 1: return world->ub_lighting.g_nightsky_colour; break;
      case 2: return world->ub_lighting.g_sunset_colour; break;
      case 3: return world->ub_lighting.g_ambient_colour; break;
      case 4: return world->ub_lighting.g_sun_colour; break;
      default: return NULL;
   }
}

void imgui_world_light_edit( world_instance *world )
{
   ui_rect panel = { vg.window_x-400, 0, 400, vg.window_y };
   ui_fill( panel, ui_colour( k_ui_bg+1 ) );
   ui_outline( panel, 1, ui_colour( k_ui_bg+7 ), 0 );
   ui_rect_pad( panel, (ui_px[2]){ 8, 8 } );
   vg_ui.wants_mouse = 1;

   static i32 option_to_edit = 0;
   ui_enum( panel, "option", skybox_setting_options, 5, &option_to_edit );
   ui_colourpicker( panel, "colour", 
                    skybox_prop_location( world, option_to_edit ) );

   if( ui_button( panel, "save tweaker file ('/tmp/tweaker.txt')\n" ) == 1 ){
      FILE *fp = fopen( "/tmp/tweaker.txt", "w" );
      
      for( i32 i=0; i<5; i ++ ){
         struct ui_enum_opt *opt = &skybox_setting_options[i];
         f32 *val = skybox_prop_location( world, i );
         fprintf( fp, "%s = {%.3ff, %.3ff, %.3ff, %.3ff},\n",
                  opt->alias, val[0], val[1], val[2], val[3] );
      }
      fclose( fp );
   }
}