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 static int ccmd_set_time( int argc, const char *argv[] ){
  12    if( argc == 1 ){
  13       world_instance *world = world_current_instance();
  14       world->time = atof( argv[0] );
  15    }
  16    else {
  17       vg_error( "Usage set_time <0-1.0>\n" );
  18    }
  19    return 0;
  20 }
  21
  22 VG_STATIC void async_world_render_init( void *payload, u32 size )
  23 {
  24    vg_info( "Allocate uniform buffers\n" );
  25    for( int i=0; i<4; i++ ){
  26       world_instance *world = &world_static.worlds[i];
  27       world->ubo_bind_point = i;
  28
  29       glGenBuffers( 1, &world->ubo_lighting );
  30       glBindBuffer( GL_UNIFORM_BUFFER, world->ubo_lighting );
  31       glBufferData( GL_UNIFORM_BUFFER, sizeof(struct ub_world_lighting),
  32                     NULL, GL_DYNAMIC_DRAW );
  33
  34       glBindBufferBase( GL_UNIFORM_BUFFER, i, world->ubo_lighting );
  35       VG_CHECK_GL_ERR();
  36    }
  37
  38    vg_info( "Allocate frame buffers\n" );
  39    for( int i=0; i<4; i++ ){
  40       world_instance *world = &world_static.worlds[i];
  41       struct framebuffer *fb = &world->heightmap;
  42
  43       fb->display_name = NULL;
  44       fb->link = NULL;
  45       fb->fixed_w = 1024;
  46       fb->fixed_h = 1024;
  47       fb->resolution_div = 0;
  48
  49       fb->attachments[0].display_name     = NULL;
  50       fb->attachments[0].purpose = k_framebuffer_attachment_type_texture;
  51       fb->attachments[0].internalformat   = GL_RG16F;
  52       fb->attachments[0].format           = GL_RG;
  53       fb->attachments[0].type             = GL_FLOAT;
  54       fb->attachments[0].attachment       = GL_COLOR_ATTACHMENT0;
  55
  56       fb->attachments[1].purpose = k_framebuffer_attachment_type_none;
  57       fb->attachments[2].purpose = k_framebuffer_attachment_type_none;
  58       fb->attachments[3].purpose = k_framebuffer_attachment_type_none;
  59       fb->attachments[4].purpose = k_framebuffer_attachment_type_none;
  60
  61       render_fb_allocate( fb );
  62    }
  63 }
  64
  65 VG_STATIC void world_render_init(void)
  66 {
  67    VG_VAR_F32( k_day_length );
  68    VG_VAR_I32( k_debug_light_indices );
  69    VG_VAR_I32( k_debug_light_complexity );
  70    VG_VAR_I32( k_light_preview );
  71    vg_console_reg_cmd( "set_time", ccmd_set_time, NULL );
  72
  73    world_render.sky_rate = 1.0;
  74    world_render.sky_target_rate = 1.0;
  75
  76    shader_scene_standard_register();
  77    shader_scene_standard_alphatest_register();
  78    shader_scene_vertex_blend_register();
  79    shader_scene_terrain_register();
  80    shader_scene_depth_register();
  81    shader_scene_position_register();
  82    shader_model_sky_register();
  83
  84    vg_info( "Loading world resources\n" );
  85    vg_linear_clear( vg_mem.scratch );
  86
  87    mdl_context msky;
  88    mdl_open( &msky, "models/rs_skydome.mdl", vg_mem.scratch );
  89    mdl_load_metadata_block( &msky, vg_mem.scratch );
  90    mdl_async_load_glmesh( &msky, &world_render.skydome );
  91    mdl_close( &msky );
  92
  93    vg_info( "Loading default world textures\n" );
  94    vg_tex2d_load_qoi_async_file( "textures/garbage.qoi",
  95                                  VG_TEX2D_NEAREST|VG_TEX2D_REPEAT,
  96                                  &world_render.tex_terrain_noise );
  97
  98    vg_async_call( async_world_render_init, NULL, 0 );
  99 }
 100
 101 VG_STATIC void world_link_lighting_ub( world_instance *world, GLuint shader )
 102 {
 103    GLuint idx = glGetUniformBlockIndex( shader, "ub_world_lighting" );
 104    glUniformBlockBinding( shader, idx, world->ubo_bind_point );
 105 }
 106
 107 VG_STATIC void world_bind_position_texture( world_instance *world,
 108                                             GLuint shader, GLuint location,
 109                                             int slot )
 110 {
 111    render_fb_bind_texture( &world->heightmap, 0, slot );
 112    glUniform1i( location, slot );
 113 }
 114
 115 VG_STATIC void world_bind_light_array( world_instance *world,
 116                                        GLuint shader, GLuint location,
 117                                        int slot )
 118 {
 119    glActiveTexture( GL_TEXTURE0 + slot );
 120    glBindTexture( GL_TEXTURE_BUFFER, world->tex_light_entities );
 121    glUniform1i( location, slot );
 122 }
 123
 124 VG_STATIC void world_bind_light_index( world_instance *world,
 125                                        GLuint shader, GLuint location,
 126                                        int slot )
 127 {
 128    glActiveTexture( GL_TEXTURE0 + slot );
 129    glBindTexture( GL_TEXTURE_3D, world->tex_light_cubes );
 130    glUniform1i( location, slot );
 131 }
 132
 133 VG_STATIC void render_world_depth( world_instance *world, camera *cam );
 134
 135 /*
 136  * Rendering
 137  */
 138
 139 VG_STATIC void bind_terrain_noise(void)
 140 {
 141    glActiveTexture( GL_TEXTURE0 );
 142    glBindTexture( GL_TEXTURE_2D, world_render.tex_terrain_noise );
 143 }
 144
 145 struct world_pass{
 146    camera *cam;
 147    enum mdl_shader shader;
 148    enum world_geo_type geo_type;
 149
 150    void (*fn_bind_textures)( world_instance *world,
 151                              struct world_surface *mat );
 152    void (*fn_set_mdl)( m4x3f mdl );
 153    void (*fn_set_uPvmPrev)( m4x4f pvm );
 154 };
 155
 156 VG_STATIC void world_render_if( world_instance *world, struct world_pass *pass )
 157 {
 158    for( int i=0; i<world->surface_count; i++ ){
 159       struct world_surface *mat = &world->surfaces[i];
 160
 161       if( mat->info.shader == pass->shader ){
 162          mdl_submesh *sm;
 163
 164          if( pass->geo_type == k_world_geo_type_solid )
 165             sm = &mat->sm_geo;
 166          else
 167             sm = &mat->sm_no_collide;
 168
 169          if( !sm->indice_count )
 170             continue;
 171
 172          m4x3f mmdl;
 173          m4x3_identity( mmdl );
 174          pass->fn_set_mdl( mmdl );
 175          pass->fn_set_uPvmPrev( pass->cam->mtx_prev.pv );
 176
 177          pass->fn_bind_textures( world, mat );
 178          mdl_draw_submesh( sm );
 179
 180          for( u32 j=0; j<mdl_arrcount( &world->ent_traffic ); j++ ){
 181             ent_traffic *traffic = mdl_arritm( &world->ent_traffic, j );
 182
 183             for( u32 k=0; k<traffic->submesh_count; k++ ){
 184                sm = mdl_arritm( &world->meta.submeshs,
 185                                  traffic->submesh_start+k );
 186
 187                q_m3x3( traffic->transform.q, mmdl );
 188                v3_copy( traffic->transform.co, mmdl[3] );
 189
 190                m4x4f m4mdl;
 191                m4x3_expand( mmdl, m4mdl );
 192                m4x4_mul( pass->cam->mtx_prev.pv, m4mdl, m4mdl );
 193
 194                pass->fn_set_mdl( mmdl );
 195                pass->fn_set_uPvmPrev( m4mdl );
 196
 197                mdl_draw_submesh( sm );
 198             }
 199          }
 200       }
 201    }
 202 }
 203
 204 VG_STATIC
 205 void world_render_both_stages( world_instance *world, struct world_pass *pass )
 206 {
 207    mesh_bind( &world->mesh_geo );
 208    pass->geo_type = k_world_geo_type_solid;
 209    world_render_if( world, pass );
 210
 211    glDisable( GL_CULL_FACE );
 212    mesh_bind( &world->mesh_no_collide );
 213    pass->geo_type = k_world_geo_type_nonsolid;
 214    world_render_if( world, pass );
 215    glEnable( GL_CULL_FACE );
 216 }
 217
 218 VG_STATIC void bindpoint_diffuse_texture1( world_instance *world,
 219                                            struct world_surface *mat )
 220
 221 {
 222    glActiveTexture( GL_TEXTURE1 );
 223    glBindTexture( GL_TEXTURE_2D, world->textures[ mat->info.tex_diffuse ] );
 224 }
 225
 226 VG_STATIC void render_world_vb( world_instance *world, camera *cam )
 227 {
 228    shader_scene_vertex_blend_use();
 229    shader_scene_vertex_blend_uTexGarbage(0);
 230    shader_scene_vertex_blend_uTexGradients(1);
 231    world_link_lighting_ub( world, _shader_scene_vertex_blend.id );
 232    world_bind_position_texture( world, _shader_scene_vertex_blend.id,
 233                                 _uniform_scene_vertex_blend_g_world_depth, 2 );
 234    world_bind_light_array( world, _shader_scene_vertex_blend.id,
 235                                 _uniform_scene_vertex_blend_uLightsArray, 3 );
 236    world_bind_light_index( world, _shader_scene_vertex_blend.id,
 237                                 _uniform_scene_vertex_blend_uLightsIndex, 4 );
 238
 239    glActiveTexture( GL_TEXTURE0 );
 240    glBindTexture( GL_TEXTURE_2D, world_render.tex_terrain_noise );
 241
 242    shader_scene_vertex_blend_uPv( cam->mtx.pv );
 243    shader_scene_vertex_blend_uCamera( cam->transform[3] );
 244
 245    struct world_pass pass = {
 246       .shader = k_shader_standard_vertex_blend,
 247       .cam = cam,
 248       .fn_bind_textures = bindpoint_diffuse_texture1,
 249       .fn_set_mdl = shader_scene_vertex_blend_uMdl,
 250       .fn_set_uPvmPrev = shader_scene_vertex_blend_uPvmPrev,
 251    };
 252
 253    world_render_both_stages( world, &pass );
 254 }
 255
 256 VG_STATIC void render_world_standard( world_instance *world, camera *cam )
 257 {
 258    shader_scene_standard_use();
 259    shader_scene_standard_uTexGarbage(0);
 260    shader_scene_standard_uTexMain(1);
 261    shader_scene_standard_uPv( cam->mtx.pv );
 262
 263    world_link_lighting_ub( world, _shader_scene_standard.id );
 264    world_bind_position_texture( world, _shader_scene_standard.id,
 265                                 _uniform_scene_standard_g_world_depth, 2 );
 266    world_bind_light_array( world, _shader_scene_standard.id,
 267                                 _uniform_scene_standard_uLightsArray, 3 );
 268    world_bind_light_index( world, _shader_scene_standard.id,
 269                                 _uniform_scene_standard_uLightsIndex, 4 );
 270
 271    bind_terrain_noise();
 272    shader_scene_standard_uCamera( cam->transform[3] );
 273
 274    struct world_pass pass = {
 275       .shader = k_shader_standard,
 276       .cam = cam,
 277       .fn_bind_textures = bindpoint_diffuse_texture1,
 278       .fn_set_mdl = shader_scene_standard_uMdl,
 279       .fn_set_uPvmPrev = shader_scene_standard_uPvmPrev,
 280    };
 281
 282    world_render_both_stages( world, &pass );
 283 }
 284
 285 VG_STATIC void render_world_alphatest( world_instance *world, camera *cam )
 286 {
 287    shader_scene_standard_alphatest_use();
 288    shader_scene_standard_alphatest_uTexGarbage(0);
 289    shader_scene_standard_alphatest_uTexMain(1);
 290    shader_scene_standard_alphatest_uPv( cam->mtx.pv );
 291
 292    world_link_lighting_ub( world, _shader_scene_standard_alphatest.id );
 293    world_bind_position_texture( world, _shader_scene_standard_alphatest.id,
 294                         _uniform_scene_standard_alphatest_g_world_depth, 2 );
 295    world_bind_light_array( world, _shader_scene_standard_alphatest.id,
 296                         _uniform_scene_standard_alphatest_uLightsArray, 3 );
 297    world_bind_light_index( world, _shader_scene_standard_alphatest.id,
 298                            _uniform_scene_standard_alphatest_uLightsIndex, 4 );
 299
 300
 301    bind_terrain_noise();
 302
 303
 304    shader_scene_standard_alphatest_uCamera( cam->transform[3] );
 305
 306    glDisable(GL_CULL_FACE);
 307
 308    struct world_pass pass = {
 309       .shader = k_shader_standard_cutout,
 310       .cam = cam,
 311       .fn_bind_textures = bindpoint_diffuse_texture1,
 312       .fn_set_mdl = shader_scene_standard_alphatest_uMdl,
 313       .fn_set_uPvmPrev = shader_scene_standard_alphatest_uPvmPrev,
 314    };
 315
 316    world_render_both_stages( world, &pass );
 317
 318    glEnable(GL_CULL_FACE);
 319 }
 320
 321 VG_STATIC void bindpoint_terrain( world_instance *world,
 322                                   struct world_surface *mat )
 323 {
 324    glActiveTexture( GL_TEXTURE1 );
 325    glBindTexture( GL_TEXTURE_2D, world->textures[ mat->info.tex_diffuse ] );
 326
 327    shader_scene_terrain_uSandColour( mat->info.colour );
 328    shader_scene_terrain_uBlendOffset( mat->info.colour1 );
 329 }
 330
 331 VG_STATIC void render_terrain( world_instance *world, camera *cam )
 332 {
 333    shader_scene_terrain_use();
 334    shader_scene_terrain_uTexGarbage(0);
 335    shader_scene_terrain_uTexGradients(1);
 336
 337    world_link_lighting_ub( world, _shader_scene_terrain.id );
 338    world_bind_position_texture( world, _shader_scene_terrain.id,
 339                         _uniform_scene_terrain_g_world_depth, 2 );
 340    world_bind_light_array( world, _shader_scene_terrain.id,
 341                         _uniform_scene_terrain_uLightsArray, 3 );
 342    world_bind_light_index( world, _shader_scene_terrain.id,
 343                            _uniform_scene_terrain_uLightsIndex, 4 );
 344
 345    glActiveTexture( GL_TEXTURE0 );
 346    glBindTexture( GL_TEXTURE_2D, world_render.tex_terrain_noise );
 347
 348    shader_scene_terrain_uPv( cam->mtx.pv );
 349    shader_scene_terrain_uCamera( cam->transform[3] );
 350
 351    struct world_pass pass = {
 352       .shader = k_shader_terrain_blend,
 353       .cam = cam,
 354       .fn_bind_textures = bindpoint_terrain,
 355       .fn_set_mdl = shader_scene_terrain_uMdl,
 356       .fn_set_uPvmPrev = shader_scene_terrain_uPvmPrev,
 357    };
 358
 359    world_render_both_stages( world, &pass );
 360 }
 361
 362 VG_STATIC void render_sky( world_instance *world, camera *cam )
 363 {
 364    /*
 365     * Modify matrix to remove clipping and view translation
 366     */
 367    m4x4f v,
 368          v_prev,
 369          pv,
 370          pv_prev;
 371
 372    m4x4_copy( cam->mtx.v, v );
 373    m4x4_copy( cam->mtx_prev.v, v_prev );
 374    v3_zero( v[3] );
 375    v3_zero( v_prev[3] );
 376
 377    m4x4_copy( cam->mtx.p,      pv );
 378    m4x4_copy( cam->mtx_prev.p, pv_prev );
 379    m4x4_reset_clipping( pv,      cam->farz, cam->nearz );
 380    m4x4_reset_clipping( pv_prev, cam->farz, cam->nearz );
 381
 382    m4x4_mul( pv,      v,      pv );
 383    m4x4_mul( pv_prev, v_prev, pv_prev );
 384
 385    m4x3f identity_matrix;
 386    m4x3_identity( identity_matrix );
 387
 388    /*
 389     * Draw
 390     */
 391    shader_model_sky_use();
 392    shader_model_sky_uMdl( identity_matrix );
 393    shader_model_sky_uPv( pv );
 394    shader_model_sky_uPvmPrev( pv_prev );
 395    shader_model_sky_uTexGarbage(0);
 396    world_link_lighting_ub( world, _shader_model_sky.id );
 397
 398    glActiveTexture( GL_TEXTURE0 );
 399    glBindTexture( GL_TEXTURE_2D, world_render.tex_terrain_noise );
 400
 401    glDepthMask( GL_FALSE );
 402    glDisable( GL_DEPTH_TEST );
 403
 404    mesh_bind( &world_render.skydome );
 405    mesh_draw( &world_render.skydome );
 406
 407    glEnable( GL_DEPTH_TEST );
 408    glDepthMask( GL_TRUE );
 409 }
 410
 411 VG_STATIC void render_world_gates( world_instance *world, camera *cam,
 412                                    int layer_depth )
 413 {
 414    float closest = INFINITY;
 415    struct ent_gate *gate = NULL;
 416
 417    for( u32 i=0; i<mdl_arrcount(&world->ent_gate); i++ ){
 418       ent_gate *gi = mdl_arritm( &world->ent_gate, i );
 419
 420       if( gi->type == k_gate_type_unlinked )
 421          continue;
 422
 423       float dist = v3_dist2( gi->co[0], cam->transform[3] );
 424
 425       vg_line_pt3( gi->co[0], 0.25f, VG__BLUE );
 426
 427       if( dist < closest ){
 428          closest = dist;
 429          gate = gi;
 430       }
 431    }
 432
 433    if( gate ){
 434       /* should really be set in fixed update since its used in the physics
 435        * of most systems. too bad! */
 436       world->rendering_gate = gate;
 437
 438       if( gate->type == k_gate_type_teleport ){
 439          render_gate( world, gate, cam, layer_depth );
 440       }
 441       else if( gate->type == k_gate_type_nonlocel ){
 442          if( world_loader.state != k_world_loader_none ){
 443             world->rendering_gate = NULL;
 444             return;
 445          }
 446
 447          world_instance *dest_world = &world_static.worlds[ gate->target ];
 448          render_gate( dest_world, gate, cam, layer_depth );
 449       }
 450       else
 451          world->rendering_gate = NULL;
 452    }
 453 }
 454
 455 VG_STATIC void world_prerender( world_instance *world )
 456 {
 457
 458    if( mdl_arrcount( &world->ent_light ) ){
 459       f32 rate = vg_maxf(0.1f, fabsf(k_day_length)) * vg_signf(k_day_length);
 460       world->time += vg.time_delta * (1.0/(rate*60.0));
 461    }
 462    else{
 463       world->time = 0.834;
 464    }
 465
 466    struct ub_world_lighting *state = &world->ub_lighting;
 467
 468    state->g_time = world->time;
 469    state->g_realtime = vg.time;
 470    state->g_debug_indices = k_debug_light_indices;
 471    state->g_light_preview = k_light_preview;
 472    state->g_debug_complexity = k_debug_light_complexity;
 473    state->g_time_of_day = vg_fractf( world->time );
 474    state->g_day_phase   = cosf( state->g_time_of_day * VG_PIf * 2.0f );
 475    state->g_sunset_phase= cosf( state->g_time_of_day * VG_PIf * 4.0f + VG_PIf );
 476
 477    state->g_day_phase    =       state->g_day_phase    * 0.5f + 0.5f;
 478    state->g_sunset_phase = powf( state->g_sunset_phase * 0.5f + 0.5f, 6.0f );
 479
 480    float a = state->g_time_of_day * VG_PIf * 2.0f;
 481    state->g_sun_dir[0] = sinf( a );
 482    state->g_sun_dir[1] = cosf( a );
 483    state->g_sun_dir[2] = 0.2f;
 484    v3_normalize( state->g_sun_dir );
 485
 486    world->probabilities[ k_probability_curve_constant ] = 1.0f;
 487    float dp = state->g_day_phase;
 488
 489    world->probabilities[ k_probability_curve_wildlife_day ] =
 490       (dp*dp*0.8f+state->g_sunset_phase)*0.8f;
 491    world->probabilities[ k_probability_curve_wildlife_night ] =
 492       1.0f-powf(fabsf((state->g_time_of_day-0.5f)*5.0f),5.0f);
 493
 494    glBindBuffer( GL_UNIFORM_BUFFER, world->ubo_lighting );
 495    glBufferSubData( GL_UNIFORM_BUFFER, 0,
 496                     sizeof(struct ub_world_lighting), &world->ub_lighting );
 497 }
 498
 499 VG_STATIC void skateshop_render(void);
 500 VG_STATIC void render_world( world_instance *world, camera *cam,
 501                              int layer_depth )
 502 {
 503    render_sky( world, cam );
 504
 505    render_world_routes( world, cam, layer_depth );
 506    render_world_standard( world, cam );
 507    render_world_vb( world, cam );
 508    render_world_alphatest( world, cam );
 509    render_terrain( world, cam );
 510
 511    if( layer_depth == 0 ){
 512       skateshop_render();
 513
 514       /* Render SFD's */
 515       u32 closest = 0;
 516       float min_dist = INFINITY;
 517
 518       if( !mdl_arrcount( &world->ent_route ) )
 519          return;
 520
 521       for( u32 i=0; i<mdl_arrcount( &world->ent_route ); i++ ){
 522          ent_route *route = mdl_arritm( &world->ent_route, i );
 523          float dist = v3_dist2( route->board_transform[3], cam->pos );
 524
 525          if( dist < min_dist ){
 526             min_dist = dist;
 527             closest = i;
 528          }
 529       }
 530
 531       ent_route *route = mdl_arritm( &world->ent_route, closest );
 532       sfd_render( world, cam, route->board_transform );
 533    }
 534 }
 535
 536 VG_STATIC void render_world_depth( world_instance *world, camera *cam )
 537 {
 538    m4x3f identity_matrix;
 539    m4x3_identity( identity_matrix );
 540
 541    shader_scene_depth_use();
 542    shader_scene_depth_uCamera( cam->transform[3] );
 543    shader_scene_depth_uPv( cam->mtx.pv );
 544    shader_scene_depth_uPvmPrev( cam->mtx_prev.pv );
 545    shader_scene_depth_uMdl( identity_matrix );
 546    world_link_lighting_ub( world, _shader_scene_depth.id );
 547
 548    mesh_bind( &world->mesh_geo );
 549    mesh_draw( &world->mesh_geo );
 550 }
 551
 552 VG_STATIC void render_world_position( world_instance *world, camera *cam )
 553 {
 554    m4x3f identity_matrix;
 555    m4x3_identity( identity_matrix );
 556
 557    shader_scene_position_use();
 558    shader_scene_position_uCamera( cam->transform[3] );
 559    shader_scene_position_uPv( cam->mtx.pv );
 560    shader_scene_position_uPvmPrev( cam->mtx_prev.pv );
 561    shader_scene_position_uMdl( identity_matrix );
 562    world_link_lighting_ub( world, _shader_scene_position.id );
 563
 564    mesh_bind( &world->mesh_geo );
 565    mesh_draw( &world->mesh_geo );
 566 }
 567
 568 #endif