world_render.c

   1 /*
   2  * Copyright (C) 2021-2023 Mt.ZERO Software, Harry Godden - All Rights Reserved
   3  */
   4
   5 #ifndef WORLD_RENDER_C
   6 #define WORLD_RENDER_C
   7
   8 #include "world.h"
   9 #include "world_render.h"
  10
  11 VG_STATIC void async_world_render_init( void *payload, u32 size )
  12 {
  13    vg_info( "Allocate uniform buffers\n" );
  14    for( int i=0; i<4; i++ ){
  15       world_instance *world = &world_static.worlds[i];
  16       world->ubo_bind_point = i;
  17
  18       glGenBuffers( 1, &world->ubo_lighting );
  19       glBindBuffer( GL_UNIFORM_BUFFER, world->ubo_lighting );
  20       glBufferData( GL_UNIFORM_BUFFER, sizeof(struct ub_world_lighting),
  21                     NULL, GL_DYNAMIC_DRAW );
  22
  23       glBindBufferBase( GL_UNIFORM_BUFFER, i, world->ubo_lighting );
  24       VG_CHECK_GL_ERR();
  25    }
  26
  27    vg_info( "Allocate frame buffers\n" );
  28    for( int i=0; i<4; i++ ){
  29       world_instance *world = &world_static.worlds[i];
  30       struct framebuffer *fb = &world->heightmap;
  31
  32       fb->display_name = NULL;
  33       fb->link = NULL;
  34       fb->fixed_w = 1024;
  35       fb->fixed_h = 1024;
  36       fb->resolution_div = 0;
  37
  38       fb->attachments[0].display_name     = NULL;
  39       fb->attachments[0].purpose = k_framebuffer_attachment_type_texture;
  40       fb->attachments[0].internalformat   = GL_RG16F;
  41       fb->attachments[0].format           = GL_RG;
  42       fb->attachments[0].type             = GL_FLOAT;
  43       fb->attachments[0].attachment       = GL_COLOR_ATTACHMENT0;
  44
  45       fb->attachments[1].purpose = k_framebuffer_attachment_type_none;
  46       fb->attachments[2].purpose = k_framebuffer_attachment_type_none;
  47       fb->attachments[3].purpose = k_framebuffer_attachment_type_none;
  48       fb->attachments[4].purpose = k_framebuffer_attachment_type_none;
  49
  50       render_fb_allocate( fb );
  51    }
  52 }
  53
  54 VG_STATIC void world_render_init(void)
  55 {
  56    shader_scene_standard_register();
  57    shader_scene_standard_alphatest_register();
  58    shader_scene_vertex_blend_register();
  59    shader_scene_terrain_register();
  60    shader_scene_depth_register();
  61    shader_scene_position_register();
  62    shader_model_sky_register();
  63
  64    vg_info( "Loading default world textures\n" );
  65    vg_tex2d_load_qoi_async_file( "textures/garbage.qoi",
  66                                  VG_TEX2D_NEAREST|VG_TEX2D_REPEAT,
  67                                  &world_render.tex_terrain_noise );
  68
  69    vg_async_call( async_world_render_init, NULL, 0 );
  70 }
  71
  72 VG_STATIC void world_link_lighting_ub( world_instance *world, GLuint shader )
  73 {
  74    GLuint idx = glGetUniformBlockIndex( shader, "ub_world_lighting" );
  75    glUniformBlockBinding( shader, idx, world->ubo_bind_point );
  76 }
  77
  78 VG_STATIC void world_bind_position_texture( world_instance *world,
  79                                             GLuint shader, GLuint location,
  80                                             int slot )
  81 {
  82    render_fb_bind_texture( &world->heightmap, 0, slot );
  83    glUniform1i( location, slot );
  84 }
  85
  86 VG_STATIC void world_bind_light_array( world_instance *world,
  87                                        GLuint shader, GLuint location,
  88                                        int slot )
  89 {
  90    glActiveTexture( GL_TEXTURE0 + slot );
  91    glBindTexture( GL_TEXTURE_BUFFER, world->tex_light_entities );
  92    glUniform1i( location, slot );
  93 }
  94
  95 VG_STATIC void world_bind_light_index( world_instance *world,
  96                                        GLuint shader, GLuint location,
  97                                        int slot )
  98 {
  99    glActiveTexture( GL_TEXTURE0 + slot );
 100    glBindTexture( GL_TEXTURE_3D, world->tex_light_cubes );
 101    glUniform1i( location, slot );
 102 }
 103
 104 VG_STATIC void render_world_depth( world_instance *world, camera *cam );
 105
 106 /*
 107  * Rendering
 108  */
 109
 110 VG_STATIC void bind_terrain_noise(void)
 111 {
 112    glActiveTexture( GL_TEXTURE0 );
 113    glBindTexture( GL_TEXTURE_2D, world_render.tex_terrain_noise );
 114 }
 115
 116 struct world_pass{
 117    camera *cam;
 118    enum mdl_shader shader;
 119    enum world_geo_type geo_type;
 120
 121    void (*fn_bind_textures)( world_instance *world,
 122                              struct world_surface *mat );
 123    void (*fn_set_mdl)( m4x3f mdl );
 124    void (*fn_set_uPvmPrev)( m4x4f pvm );
 125 };
 126
 127 VG_STATIC void world_render_if( world_instance *world, struct world_pass *pass )
 128 {
 129    for( int i=0; i<world->surface_count; i++ ){
 130       struct world_surface *mat = &world->surfaces[i];
 131
 132       if( mat->info.shader == pass->shader ){
 133          mdl_submesh *sm;
 134
 135          if( pass->geo_type == k_world_geo_type_solid )
 136             sm = &mat->sm_geo;
 137          else
 138             sm = &mat->sm_no_collide;
 139
 140          if( !sm->indice_count )
 141             continue;
 142
 143          m4x3f mmdl;
 144          m4x3_identity( mmdl );
 145          pass->fn_set_mdl( mmdl );
 146          pass->fn_set_uPvmPrev( pass->cam->mtx_prev.pv );
 147
 148          pass->fn_bind_textures( world, mat );
 149          mdl_draw_submesh( sm );
 150
 151          for( u32 j=0; j<mdl_arrcount( &world->ent_traffic ); j++ ){
 152             ent_traffic *traffic = mdl_arritm( &world->ent_traffic, j );
 153
 154             for( u32 k=0; k<traffic->submesh_count; k++ ){
 155                sm = mdl_arritm( &world->meta.submeshs,
 156                                  traffic->submesh_start+k );
 157
 158                q_m3x3( traffic->transform.q, mmdl );
 159                v3_copy( traffic->transform.co, mmdl[3] );
 160
 161                m4x4f m4mdl;
 162                m4x3_expand( mmdl, m4mdl );
 163                m4x4_mul( pass->cam->mtx_prev.pv, m4mdl, m4mdl );
 164
 165                pass->fn_set_mdl( mmdl );
 166                pass->fn_set_uPvmPrev( m4mdl );
 167
 168                mdl_draw_submesh( sm );
 169             }
 170          }
 171       }
 172    }
 173 }
 174
 175 VG_STATIC
 176 void world_render_both_stages( world_instance *world, struct world_pass *pass )
 177 {
 178    mesh_bind( &world->mesh_geo );
 179    pass->geo_type = k_world_geo_type_solid;
 180    world_render_if( world, pass );
 181
 182    glDisable( GL_CULL_FACE );
 183    mesh_bind( &world->mesh_no_collide );
 184    pass->geo_type = k_world_geo_type_nonsolid;
 185    world_render_if( world, pass );
 186    glEnable( GL_CULL_FACE );
 187 }
 188
 189 VG_STATIC void bindpoint_diffuse_texture1( world_instance *world,
 190                                            struct world_surface *mat )
 191
 192 {
 193    glActiveTexture( GL_TEXTURE1 );
 194    glBindTexture( GL_TEXTURE_2D, world->textures[ mat->info.tex_diffuse ] );
 195 }
 196
 197 VG_STATIC void render_world_vb( world_instance *world, camera *cam )
 198 {
 199    shader_scene_vertex_blend_use();
 200    shader_scene_vertex_blend_uTexGarbage(0);
 201    shader_scene_vertex_blend_uTexGradients(1);
 202    world_link_lighting_ub( world, _shader_scene_vertex_blend.id );
 203    world_bind_position_texture( world, _shader_scene_vertex_blend.id,
 204                                 _uniform_scene_vertex_blend_g_world_depth, 2 );
 205    world_bind_light_array( world, _shader_scene_vertex_blend.id,
 206                                 _uniform_scene_vertex_blend_uLightsArray, 3 );
 207    world_bind_light_index( world, _shader_scene_vertex_blend.id,
 208                                 _uniform_scene_vertex_blend_uLightsIndex, 4 );
 209
 210    glActiveTexture( GL_TEXTURE0 );
 211    glBindTexture( GL_TEXTURE_2D, world_render.tex_terrain_noise );
 212
 213    shader_scene_vertex_blend_uPv( cam->mtx.pv );
 214    shader_scene_vertex_blend_uCamera( cam->transform[3] );
 215
 216    struct world_pass pass = {
 217       .shader = k_shader_standard_vertex_blend,
 218       .cam = cam,
 219       .fn_bind_textures = bindpoint_diffuse_texture1,
 220       .fn_set_mdl = shader_scene_vertex_blend_uMdl,
 221       .fn_set_uPvmPrev = shader_scene_vertex_blend_uPvmPrev,
 222    };
 223
 224    world_render_both_stages( world, &pass );
 225 }
 226
 227 VG_STATIC void render_world_standard( world_instance *world, camera *cam )
 228 {
 229    shader_scene_standard_use();
 230    shader_scene_standard_uTexGarbage(0);
 231    shader_scene_standard_uTexMain(1);
 232    shader_scene_standard_uPv( cam->mtx.pv );
 233
 234    world_link_lighting_ub( world, _shader_scene_standard.id );
 235    world_bind_position_texture( world, _shader_scene_standard.id,
 236                                 _uniform_scene_standard_g_world_depth, 2 );
 237    world_bind_light_array( world, _shader_scene_standard.id,
 238                                 _uniform_scene_standard_uLightsArray, 3 );
 239    world_bind_light_index( world, _shader_scene_standard.id,
 240                                 _uniform_scene_standard_uLightsIndex, 4 );
 241
 242    bind_terrain_noise();
 243    shader_scene_standard_uCamera( cam->transform[3] );
 244
 245    struct world_pass pass = {
 246       .shader = k_shader_standard,
 247       .cam = cam,
 248       .fn_bind_textures = bindpoint_diffuse_texture1,
 249       .fn_set_mdl = shader_scene_standard_uMdl,
 250       .fn_set_uPvmPrev = shader_scene_standard_uPvmPrev,
 251    };
 252
 253    world_render_both_stages( world, &pass );
 254 }
 255
 256 VG_STATIC void render_world_alphatest( world_instance *world, camera *cam )
 257 {
 258    shader_scene_standard_alphatest_use();
 259    shader_scene_standard_alphatest_uTexGarbage(0);
 260    shader_scene_standard_alphatest_uTexMain(1);
 261    shader_scene_standard_alphatest_uPv( cam->mtx.pv );
 262
 263    world_link_lighting_ub( world, _shader_scene_standard_alphatest.id );
 264    world_bind_position_texture( world, _shader_scene_standard_alphatest.id,
 265                         _uniform_scene_standard_alphatest_g_world_depth, 2 );
 266    world_bind_light_array( world, _shader_scene_standard_alphatest.id,
 267                         _uniform_scene_standard_alphatest_uLightsArray, 3 );
 268    world_bind_light_index( world, _shader_scene_standard_alphatest.id,
 269                            _uniform_scene_standard_alphatest_uLightsIndex, 4 );
 270
 271
 272    bind_terrain_noise();
 273
 274
 275    shader_scene_standard_alphatest_uCamera( cam->transform[3] );
 276
 277    glDisable(GL_CULL_FACE);
 278
 279    struct world_pass pass = {
 280       .shader = k_shader_standard_cutout,
 281       .cam = cam,
 282       .fn_bind_textures = bindpoint_diffuse_texture1,
 283       .fn_set_mdl = shader_scene_standard_alphatest_uMdl,
 284       .fn_set_uPvmPrev = shader_scene_standard_alphatest_uPvmPrev,
 285    };
 286
 287    world_render_both_stages( world, &pass );
 288
 289    glEnable(GL_CULL_FACE);
 290 }
 291
 292 VG_STATIC void bindpoint_terrain( world_instance *world,
 293                                   struct world_surface *mat )
 294 {
 295    glActiveTexture( GL_TEXTURE1 );
 296    glBindTexture( GL_TEXTURE_2D, world->textures[ mat->info.tex_diffuse ] );
 297
 298    shader_scene_terrain_uSandColour( mat->info.colour );
 299    shader_scene_terrain_uBlendOffset( mat->info.colour1 );
 300 }
 301
 302 VG_STATIC void render_terrain( world_instance *world, camera *cam )
 303 {
 304    shader_scene_terrain_use();
 305    shader_scene_terrain_uTexGarbage(0);
 306    shader_scene_terrain_uTexGradients(1);
 307
 308    world_link_lighting_ub( world, _shader_scene_terrain.id );
 309    world_bind_position_texture( world, _shader_scene_terrain.id,
 310                         _uniform_scene_terrain_g_world_depth, 2 );
 311    world_bind_light_array( world, _shader_scene_terrain.id,
 312                         _uniform_scene_terrain_uLightsArray, 3 );
 313    world_bind_light_index( world, _shader_scene_terrain.id,
 314                            _uniform_scene_terrain_uLightsIndex, 4 );
 315
 316    glActiveTexture( GL_TEXTURE0 );
 317    glBindTexture( GL_TEXTURE_2D, world_render.tex_terrain_noise );
 318
 319    shader_scene_terrain_uPv( cam->mtx.pv );
 320    shader_scene_terrain_uCamera( cam->transform[3] );
 321
 322    struct world_pass pass = {
 323       .shader = k_shader_terrain_blend,
 324       .cam = cam,
 325       .fn_bind_textures = bindpoint_terrain,
 326       .fn_set_mdl = shader_scene_terrain_uMdl,
 327       .fn_set_uPvmPrev = shader_scene_terrain_uPvmPrev,
 328    };
 329
 330    world_render_both_stages( world, &pass );
 331 }
 332
 333 VG_STATIC void render_sky( world_instance *world, camera *cam )
 334 {
 335    /*
 336     * Modify matrix to remove clipping and view translation
 337     */
 338    m4x4f v,
 339          v_prev,
 340          pv,
 341          pv_prev;
 342
 343    m4x4_copy( cam->mtx.v, v );
 344    m4x4_copy( cam->mtx_prev.v, v_prev );
 345    v3_zero( v[3] );
 346    v3_zero( v_prev[3] );
 347
 348    m4x4_copy( cam->mtx.p,      pv );
 349    m4x4_copy( cam->mtx_prev.p, pv_prev );
 350    m4x4_reset_clipping( pv,      cam->farz, cam->nearz );
 351    m4x4_reset_clipping( pv_prev, cam->farz, cam->nearz );
 352
 353    m4x4_mul( pv,      v,      pv );
 354    m4x4_mul( pv_prev, v_prev, pv_prev );
 355
 356    m4x3f identity_matrix;
 357    m4x3_identity( identity_matrix );
 358
 359    /*
 360     * Draw
 361     */
 362    shader_model_sky_use();
 363    shader_model_sky_uMdl( identity_matrix );
 364    shader_model_sky_uPv( pv );
 365    shader_model_sky_uPvmPrev( pv_prev );
 366    shader_model_sky_uTexGarbage(0);
 367    world_link_lighting_ub( world, _shader_model_sky.id );
 368
 369    glActiveTexture( GL_TEXTURE0 );
 370    glBindTexture( GL_TEXTURE_2D, world_render.tex_terrain_noise );
 371
 372    glDepthMask( GL_FALSE );
 373    glDisable( GL_DEPTH_TEST );
 374
 375    mesh_bind( &world_render.skydome );
 376    mesh_draw( &world_render.skydome );
 377
 378    glEnable( GL_DEPTH_TEST );
 379    glDepthMask( GL_TRUE );
 380 }
 381
 382 VG_STATIC void render_world_gates( world_instance *world, camera *cam,
 383                                    int layer_depth )
 384 {
 385    float closest = INFINITY;
 386    struct ent_gate *gate = NULL;
 387
 388    for( u32 i=0; i<mdl_arrcount(&world->ent_gate); i++ ){
 389       ent_gate *gi = mdl_arritm( &world->ent_gate, i );
 390
 391       if( gi->type == k_gate_type_unlinked )
 392          continue;
 393
 394       float dist = v3_dist2( gi->co[0], cam->transform[3] );
 395
 396       vg_line_pt3( gi->co[0], 0.25f, VG__BLUE );
 397
 398       if( dist < closest ){
 399          closest = dist;
 400          gate = gi;
 401       }
 402    }
 403
 404    if( gate ){
 405       /* should really be set in fixed update since its used in the physics
 406        * of most systems. too bad! */
 407       world->rendering_gate = gate;
 408
 409       if( gate->type == k_gate_type_teleport ){
 410          render_gate( world, gate, cam, layer_depth );
 411       }
 412       else if( gate->type == k_gate_type_nonlocel ){
 413          if( skaterift.async_op != k_async_op_world_loading &&
 414              skaterift.async_op != k_async_op_world_preloading ){
 415             world_instance *dest_world = &world_static.worlds[ gate->target ];
 416             render_gate( dest_world, gate, cam, layer_depth );
 417          }
 418       }
 419       else
 420          world->rendering_gate = NULL;
 421    }
 422 }
 423
 424 VG_STATIC void world_prerender( world_instance *world )
 425 {
 426    world->time += vg.time_delta * (1.0/(k_day_length*60.0));
 427
 428    struct ub_world_lighting *state = &world->ub_lighting;
 429
 430    state->g_time = world->time;
 431    state->g_realtime = vg.time;
 432    state->g_debug_indices = k_debug_light_indices;
 433    state->g_light_preview = k_light_preview;
 434    state->g_debug_complexity = k_debug_light_complexity;
 435    state->g_time_of_day = vg_fractf( world->time );
 436    state->g_day_phase   = cosf( state->g_time_of_day * VG_PIf * 2.0f );
 437    state->g_sunset_phase= cosf( state->g_time_of_day * VG_PIf * 4.0f + VG_PIf );
 438
 439    state->g_day_phase    =       state->g_day_phase    * 0.5f + 0.5f;
 440    state->g_sunset_phase = powf( state->g_sunset_phase * 0.5f + 0.5f, 6.0f );
 441
 442    float a = state->g_time_of_day * VG_PIf * 2.0f;
 443    state->g_sun_dir[0] = sinf( a );
 444    state->g_sun_dir[1] = cosf( a );
 445    state->g_sun_dir[2] = 0.2f;
 446    v3_normalize( state->g_sun_dir );
 447
 448    world->probabilities[ k_probability_curve_constant ] = 1.0f;
 449    float dp = state->g_day_phase;
 450
 451    world->probabilities[ k_probability_curve_wildlife_day ] =
 452       (dp*dp*0.8f+state->g_sunset_phase)*0.8f;
 453    world->probabilities[ k_probability_curve_wildlife_night ] =
 454       1.0f-powf(fabsf((state->g_time_of_day-0.5f)*5.0f),5.0f);
 455
 456    glBindBuffer( GL_UNIFORM_BUFFER, world->ubo_lighting );
 457    glBufferSubData( GL_UNIFORM_BUFFER, 0,
 458                     sizeof(struct ub_world_lighting), &world->ub_lighting );
 459 }
 460
 461 VG_STATIC void skateshop_render(void);
 462 VG_STATIC void render_world( world_instance *world, camera *cam,
 463                              int layer_depth )
 464 {
 465    render_sky( world, cam );
 466
 467    render_world_routes( world, cam, layer_depth );
 468    render_world_standard( world, cam );
 469    render_world_vb( world, cam );
 470    render_world_alphatest( world, cam );
 471    render_terrain( world, cam );
 472
 473    if( layer_depth == 0 ){
 474       skateshop_render();
 475
 476       /* Render SFD's */
 477       u32 closest = 0;
 478       float min_dist = INFINITY;
 479
 480       if( !mdl_arrcount( &world->ent_route ) )
 481          return;
 482
 483       for( u32 i=0; i<mdl_arrcount( &world->ent_route ); i++ ){
 484          ent_route *route = mdl_arritm( &world->ent_route, i );
 485          float dist = v3_dist2( route->board_transform[3], cam->pos );
 486
 487          if( dist < min_dist ){
 488             min_dist = dist;
 489             closest = i;
 490          }
 491       }
 492
 493       ent_route *route = mdl_arritm( &world->ent_route, closest );
 494       sfd_render( world, cam, route->board_transform );
 495    }
 496 }
 497
 498 VG_STATIC void render_world_depth( world_instance *world, camera *cam )
 499 {
 500    m4x3f identity_matrix;
 501    m4x3_identity( identity_matrix );
 502
 503    shader_scene_depth_use();
 504    shader_scene_depth_uCamera( cam->transform[3] );
 505    shader_scene_depth_uPv( cam->mtx.pv );
 506    shader_scene_depth_uPvmPrev( cam->mtx_prev.pv );
 507    shader_scene_depth_uMdl( identity_matrix );
 508    world_link_lighting_ub( world, _shader_scene_depth.id );
 509
 510    mesh_bind( &world->mesh_geo );
 511    mesh_draw( &world->mesh_geo );
 512 }
 513
 514 VG_STATIC void render_world_position( world_instance *world, camera *cam )
 515 {
 516    m4x3f identity_matrix;
 517    m4x3_identity( identity_matrix );
 518
 519    shader_scene_position_use();
 520    shader_scene_position_uCamera( cam->transform[3] );
 521    shader_scene_position_uPv( cam->mtx.pv );
 522    shader_scene_position_uPvmPrev( cam->mtx_prev.pv );
 523    shader_scene_position_uMdl( identity_matrix );
 524    world_link_lighting_ub( world, _shader_scene_position.id );
 525
 526    mesh_bind( &world->mesh_geo );
 527    mesh_draw( &world->mesh_geo );
 528 }
 529
 530 #endif