world_render.h

   1 /*
   2  * Copyright (C) 2021-2022 Mt.ZERO Software, Harry Godden - All Rights Reserved
   3  */
   4
   5 #ifndef WORLD_RENDER_H
   6 #define WORLD_RENDER_H
   7
   8 #include "camera.h"
   9 #include "world.h"
  10
  11 /* FIXME */
  12 VG_STATIC vg_tex2d tex_terrain_noise = { .path = "textures/garbage.qoi",
  13                                          .flags = VG_TEXTURE_NEAREST };
  14
  15 VG_STATIC void world_render_init(void)
  16 {
  17    vg_info( "Loading default world textures\n" );
  18
  19    vg_acquire_thread_sync();
  20    {
  21       vg_tex2d_init( (vg_tex2d *[]){ &tex_terrain_noise }, 1 );
  22
  23
  24       vg_info( "Allocate uniform buffers\n" );
  25       for( int i=0; i<4; i++ )
  26       {
  27          world_instance *world = &world_global.worlds[i];
  28          world->ubo_bind_point = i;
  29
  30          glGenBuffers( 1, &world->ubo_lighting );
  31          glBindBuffer( GL_UNIFORM_BUFFER, world->ubo_lighting );
  32          glBufferData( GL_UNIFORM_BUFFER, sizeof(struct ub_world_lighting),
  33                        NULL, GL_DYNAMIC_DRAW );
  34
  35          glBindBufferBase( GL_UNIFORM_BUFFER, i, world->ubo_lighting );
  36          VG_CHECK_GL_ERR();
  37       }
  38
  39       vg_info( "Allocate frame buffers\n" );
  40       for( int i=0; i<4; i++ )
  41       {
  42          world_instance *world = &world_global.worlds[i];
  43          struct framebuffer *fb = &world->heightmap;
  44
  45          fb->display_name = NULL;
  46          fb->link = NULL;
  47          fb->fixed_w = 1024;
  48          fb->fixed_h = 1024;
  49          fb->resolution_div = 0;
  50
  51          fb->attachments[0].display_name     = NULL;
  52          fb->attachments[0].purpose = k_framebuffer_attachment_type_texture;
  53          fb->attachments[0].internalformat   = GL_RG16F;
  54          fb->attachments[0].format           = GL_RG;
  55          fb->attachments[0].type             = GL_FLOAT;
  56          fb->attachments[0].attachment       = GL_COLOR_ATTACHMENT0;
  57
  58          fb->attachments[1].purpose = k_framebuffer_attachment_type_none;
  59          fb->attachments[2].purpose = k_framebuffer_attachment_type_none;
  60          fb->attachments[3].purpose = k_framebuffer_attachment_type_none;
  61          fb->attachments[4].purpose = k_framebuffer_attachment_type_none;
  62
  63          render_fb_allocate( fb );
  64       }
  65    }
  66    vg_release_thread_sync();
  67 }
  68
  69 VG_STATIC void world_link_lighting_ub( world_instance *world, GLuint shader )
  70 {
  71    GLuint idx = glGetUniformBlockIndex( shader, "ub_world_lighting" );
  72    glUniformBlockBinding( shader, idx, world->ubo_bind_point );
  73 }
  74
  75 VG_STATIC void world_bind_position_texture( world_instance *world,
  76                                             GLuint shader, GLuint location,
  77                                             int slot )
  78 {
  79    render_fb_bind_texture( &world->heightmap, 0, slot );
  80    glUniform1i( location, slot );
  81 }
  82
  83 VG_STATIC void world_bind_light_array( world_instance *world,
  84                                        GLuint shader, GLuint location,
  85                                        int slot )
  86 {
  87    glActiveTexture( GL_TEXTURE0 + slot );
  88    glBindTexture( GL_TEXTURE_BUFFER, world->tex_light_entities );
  89    glUniform1i( location, slot );
  90 }
  91
  92 VG_STATIC void world_bind_light_index( world_instance *world,
  93                                        GLuint shader, GLuint location,
  94                                        int slot )
  95 {
  96    glActiveTexture( GL_TEXTURE0 + slot );
  97    glBindTexture( GL_TEXTURE_3D, world->tex_light_cubes );
  98    glUniform1i( location, slot );
  99 }
 100
 101 VG_STATIC void render_world_depth( world_instance *world, camera *cam );
 102
 103 /*
 104  * Rendering
 105  */
 106
 107 VG_STATIC void bind_terrain_noise(void)
 108 {
 109    vg_tex2d_bind( &tex_terrain_noise, 0 );
 110 }
 111
 112 struct world_pass{
 113    camera *cam;
 114    enum mdl_shader shader;
 115    enum geo_type geo_type;
 116
 117    void (*fn_bind_textures)( world_instance *world,
 118                              struct world_surface *mat );
 119    void (*fn_set_mdl)( m4x3f mdl );
 120    void (*fn_set_uPvmPrev)( m4x4f pvm );
 121 };
 122
 123 VG_STATIC void world_render_if( world_instance *world, struct world_pass *pass )
 124 {
 125    for( int i=0; i<world->surface_count; i++ ){
 126       struct world_surface *mat = &world->surfaces[i];
 127
 128       if( mat->info.shader == pass->shader ){
 129          mdl_submesh *sm;
 130
 131          if( pass->geo_type == k_geo_type_solid )
 132             sm = &mat->sm_geo;
 133          else
 134             sm = &mat->sm_no_collide;
 135
 136          if( !sm->indice_count )
 137             continue;
 138
 139          m4x3f mmdl;
 140          m4x3_identity( mmdl );
 141          pass->fn_set_mdl( mmdl );
 142          pass->fn_set_uPvmPrev( pass->cam->mtx_prev.pv );
 143
 144          pass->fn_bind_textures( world, mat );
 145          mdl_draw_submesh( sm );
 146
 147          for( u32 j=0; j<mdl_arrcount( &world->ent_traffic ); j++ ){
 148             ent_traffic *traffic = mdl_arritm( &world->ent_traffic, j );
 149
 150             for( u32 k=0; k<traffic->submesh_count; k++ ){
 151                sm = mdl_arritm( &world->meta.submeshs,
 152                                  traffic->submesh_start+k );
 153
 154                q_m3x3( traffic->transform.q, mmdl );
 155                v3_copy( traffic->transform.co, mmdl[3] );
 156
 157                m4x4f m4mdl;
 158                m4x3_expand( mmdl, m4mdl );
 159                m4x4_mul( pass->cam->mtx_prev.pv, m4mdl, m4mdl );
 160
 161                pass->fn_set_mdl( mmdl );
 162                pass->fn_set_uPvmPrev( m4mdl );
 163
 164                mdl_draw_submesh( sm );
 165             }
 166          }
 167       }
 168    }
 169 }
 170
 171 VG_STATIC
 172 void world_render_both_stages( world_instance *world, struct world_pass *pass )
 173 {
 174    mesh_bind( &world->mesh_geo );
 175    pass->geo_type = k_geo_type_solid;
 176    world_render_if( world, pass );
 177
 178    glDisable( GL_CULL_FACE );
 179    mesh_bind( &world->mesh_no_collide );
 180    pass->geo_type = k_geo_type_nonsolid;
 181    world_render_if( world, pass );
 182    glEnable( GL_CULL_FACE );
 183 }
 184
 185 VG_STATIC void bindpoint_diffuse_texture1( world_instance *world,
 186                                            struct world_surface *mat )
 187
 188 {
 189    glActiveTexture( GL_TEXTURE1 );
 190    glBindTexture( GL_TEXTURE_2D, world->textures[ mat->info.tex_diffuse ] );
 191 }
 192
 193 VG_STATIC void render_world_vb( world_instance *world, camera *cam )
 194 {
 195    shader_scene_vertex_blend_use();
 196    shader_scene_vertex_blend_uTexGarbage(0);
 197    shader_scene_vertex_blend_uTexGradients(1);
 198    world_link_lighting_ub( world, _shader_scene_vertex_blend.id );
 199    world_bind_position_texture( world, _shader_scene_vertex_blend.id,
 200                                 _uniform_scene_vertex_blend_g_world_depth, 2 );
 201    world_bind_light_array( world, _shader_scene_vertex_blend.id,
 202                                 _uniform_scene_vertex_blend_uLightsArray, 3 );
 203    world_bind_light_index( world, _shader_scene_vertex_blend.id,
 204                                 _uniform_scene_vertex_blend_uLightsIndex, 4 );
 205
 206    vg_tex2d_bind( &tex_terrain_noise, 0 );
 207
 208    shader_scene_vertex_blend_uPv( cam->mtx.pv );
 209    shader_scene_vertex_blend_uCamera( cam->transform[3] );
 210
 211    struct world_pass pass = {
 212       .shader = k_shader_standard_vertex_blend,
 213       .cam = cam,
 214       .fn_bind_textures = bindpoint_diffuse_texture1,
 215       .fn_set_mdl = shader_scene_vertex_blend_uMdl,
 216       .fn_set_uPvmPrev = shader_scene_vertex_blend_uPvmPrev,
 217    };
 218
 219    world_render_both_stages( world, &pass );
 220 }
 221
 222 VG_STATIC void render_world_standard( world_instance *world, camera *cam )
 223 {
 224    shader_scene_standard_use();
 225    shader_scene_standard_uTexGarbage(0);
 226    shader_scene_standard_uTexMain(1);
 227    shader_scene_standard_uPv( cam->mtx.pv );
 228
 229    world_link_lighting_ub( world, _shader_scene_standard.id );
 230    world_bind_position_texture( world, _shader_scene_standard.id,
 231                                 _uniform_scene_standard_g_world_depth, 2 );
 232    world_bind_light_array( world, _shader_scene_standard.id,
 233                                 _uniform_scene_standard_uLightsArray, 3 );
 234    world_bind_light_index( world, _shader_scene_standard.id,
 235                                 _uniform_scene_standard_uLightsIndex, 4 );
 236
 237    bind_terrain_noise();
 238    shader_scene_standard_uCamera( cam->transform[3] );
 239
 240    struct world_pass pass = {
 241       .shader = k_shader_standard,
 242       .cam = cam,
 243       .fn_bind_textures = bindpoint_diffuse_texture1,
 244       .fn_set_mdl = shader_scene_standard_uMdl,
 245       .fn_set_uPvmPrev = shader_scene_standard_uPvmPrev,
 246    };
 247
 248    world_render_both_stages( world, &pass );
 249 }
 250
 251 VG_STATIC void render_world_alphatest( world_instance *world, camera *cam )
 252 {
 253    shader_scene_standard_alphatest_use();
 254    shader_scene_standard_alphatest_uTexGarbage(0);
 255    shader_scene_standard_alphatest_uTexMain(1);
 256    shader_scene_standard_alphatest_uPv( cam->mtx.pv );
 257
 258    world_link_lighting_ub( world, _shader_scene_standard_alphatest.id );
 259    world_bind_position_texture( world, _shader_scene_standard_alphatest.id,
 260                         _uniform_scene_standard_alphatest_g_world_depth, 2 );
 261    world_bind_light_array( world, _shader_scene_standard_alphatest.id,
 262                         _uniform_scene_standard_alphatest_uLightsArray, 3 );
 263    world_bind_light_index( world, _shader_scene_standard_alphatest.id,
 264                            _uniform_scene_standard_alphatest_uLightsIndex, 4 );
 265
 266
 267    bind_terrain_noise();
 268
 269
 270    shader_scene_standard_alphatest_uCamera( cam->transform[3] );
 271
 272    glDisable(GL_CULL_FACE);
 273
 274    struct world_pass pass = {
 275       .shader = k_shader_standard_cutout,
 276       .cam = cam,
 277       .fn_bind_textures = bindpoint_diffuse_texture1,
 278       .fn_set_mdl = shader_scene_standard_alphatest_uMdl,
 279       .fn_set_uPvmPrev = shader_scene_standard_alphatest_uPvmPrev,
 280    };
 281
 282    world_render_both_stages( world, &pass );
 283
 284    glEnable(GL_CULL_FACE);
 285 }
 286
 287 VG_STATIC void bindpoint_terrain( world_instance *world,
 288                                   struct world_surface *mat )
 289 {
 290    glActiveTexture( GL_TEXTURE1 );
 291    glBindTexture( GL_TEXTURE_2D, world->textures[ mat->info.tex_diffuse ] );
 292
 293    shader_scene_terrain_uSandColour( mat->info.colour );
 294    shader_scene_terrain_uBlendOffset( mat->info.colour1 );
 295 }
 296
 297 VG_STATIC void render_terrain( world_instance *world, camera *cam )
 298 {
 299    shader_scene_terrain_use();
 300    shader_scene_terrain_uTexGarbage(0);
 301    shader_scene_terrain_uTexGradients(1);
 302
 303    world_link_lighting_ub( world, _shader_scene_terrain.id );
 304    world_bind_position_texture( world, _shader_scene_terrain.id,
 305                         _uniform_scene_terrain_g_world_depth, 2 );
 306    world_bind_light_array( world, _shader_scene_terrain.id,
 307                         _uniform_scene_terrain_uLightsArray, 3 );
 308    world_bind_light_index( world, _shader_scene_terrain.id,
 309                            _uniform_scene_terrain_uLightsIndex, 4 );
 310
 311    vg_tex2d_bind( &tex_terrain_noise, 0 );
 312
 313    shader_scene_terrain_uPv( cam->mtx.pv );
 314    shader_scene_terrain_uCamera( cam->transform[3] );
 315
 316    struct world_pass pass = {
 317       .shader = k_shader_terrain_blend,
 318       .cam = cam,
 319       .fn_bind_textures = bindpoint_terrain,
 320       .fn_set_mdl = shader_scene_terrain_uMdl,
 321       .fn_set_uPvmPrev = shader_scene_terrain_uPvmPrev,
 322    };
 323
 324    world_render_both_stages( world, &pass );
 325 }
 326
 327 VG_STATIC void render_sky( world_instance *world, camera *cam )
 328 {
 329    /*
 330     * Modify matrix to remove clipping and view translation
 331     */
 332    m4x4f v,
 333          v_prev,
 334          pv,
 335          pv_prev;
 336
 337    m4x4_copy( cam->mtx.v, v );
 338    m4x4_copy( cam->mtx_prev.v, v_prev );
 339    v3_zero( v[3] );
 340    v3_zero( v_prev[3] );
 341
 342    m4x4_copy( cam->mtx.p,      pv );
 343    m4x4_copy( cam->mtx_prev.p, pv_prev );
 344    m4x4_reset_clipping( pv,      cam->farz, cam->nearz );
 345    m4x4_reset_clipping( pv_prev, cam->farz, cam->nearz );
 346
 347    m4x4_mul( pv,      v,      pv );
 348    m4x4_mul( pv_prev, v_prev, pv_prev );
 349
 350    m4x3f identity_matrix;
 351    m4x3_identity( identity_matrix );
 352
 353    /*
 354     * Draw
 355     */
 356    shader_model_sky_use();
 357    shader_model_sky_uMdl( identity_matrix );
 358    shader_model_sky_uPv( pv );
 359    shader_model_sky_uPvmPrev( pv_prev );
 360    shader_model_sky_uTexGarbage(0);
 361    world_link_lighting_ub( world, _shader_model_sky.id );
 362
 363    vg_tex2d_bind( &tex_terrain_noise, 0 );
 364
 365    glDepthMask( GL_FALSE );
 366    glDisable( GL_DEPTH_TEST );
 367
 368    mesh_bind( &world_global.skydome );
 369    mesh_draw( &world_global.skydome );
 370
 371    glEnable( GL_DEPTH_TEST );
 372    glDepthMask( GL_TRUE );
 373 }
 374
 375 VG_STATIC void render_world_gates( world_instance *world, camera *cam,
 376                                    int layer_depth )
 377 {
 378    float closest = INFINITY;
 379
 380    struct ent_gate *gate = NULL;
 381
 382    for( u32 i=0; i<mdl_arrcount(&world->ent_gate); i++ ){
 383       ent_gate *gi = mdl_arritm( &world->ent_gate, i );
 384
 385       if( gi->type == k_gate_type_unlinked )
 386          continue;
 387
 388       float dist = v3_dist2( gi->co[0], cam->transform[3] );
 389
 390       vg_line_pt3( gi->co[0], 0.25f, VG__BLUE );
 391
 392       if( dist < closest ){
 393          closest = dist;
 394          gate = gi;
 395       }
 396    }
 397
 398    if( gate ){
 399       /* should really be set in fixed update since its used in the physics
 400        * of most systems. too bad! */
 401       world->rendering_gate = gate;
 402
 403       if( gate->type == k_gate_type_teleport ){
 404          render_gate( world, gate, cam, layer_depth );
 405       }
 406       else if( gate->type == k_gate_type_nonlocel ){
 407          world_instance *dest_world = &world_global.worlds[ gate->target ];
 408          render_gate( dest_world, gate, cam, layer_depth );
 409       }
 410       else
 411          world->rendering_gate = NULL;
 412    }
 413 }
 414
 415 VG_STATIC void world_prerender( world_instance *world )
 416 {
 417    static double g_time = 0.0;
 418    g_time += vg.time_delta * (1.0/(k_day_length*60.0));
 419
 420    struct ub_world_lighting *state = &world->ub_lighting;
 421
 422    state->g_time = g_time;
 423    state->g_realtime = vg.time;
 424    state->g_debug_indices = k_debug_light_indices;
 425    state->g_light_preview = k_light_preview;
 426    state->g_debug_complexity = k_debug_light_complexity;
 427 state->g_time_of_day = vg_fractf( g_time );
 428    state->g_day_phase   = cosf( state->g_time_of_day * VG_PIf * 2.0f );
 429    state->g_sunset_phase= cosf( state->g_time_of_day * VG_PIf * 4.0f + VG_PIf );
 430
 431    state->g_day_phase    =       state->g_day_phase    * 0.5f + 0.5f;
 432    state->g_sunset_phase = powf( state->g_sunset_phase * 0.5f + 0.5f, 6.0f );
 433
 434    float a = state->g_time_of_day * VG_PIf * 2.0f;
 435    state->g_sun_dir[0] = sinf( a );
 436    state->g_sun_dir[1] = cosf( a );
 437    state->g_sun_dir[2] = 0.2f;
 438    v3_normalize( state->g_sun_dir );
 439
 440
 441    world->probabilities[ k_probability_curve_constant ] = 1.0f;
 442
 443    float dp = state->g_day_phase;
 444
 445    world->probabilities[ k_probability_curve_wildlife_day ] =
 446       (dp*dp*0.8f+state->g_sunset_phase)*0.8f;
 447    world->probabilities[ k_probability_curve_wildlife_night ] =
 448       1.0f-powf(fabsf((state->g_time_of_day-0.5f)*5.0f),5.0f);
 449
 450
 451    glBindBuffer( GL_UNIFORM_BUFFER, world->ubo_lighting );
 452    glBufferSubData( GL_UNIFORM_BUFFER, 0,
 453                     sizeof(struct ub_world_lighting), &world->ub_lighting );
 454 }
 455
 456 VG_STATIC void render_world( world_instance *world, camera *cam,
 457                              int layer_depth )
 458 {
 459    render_sky( world, cam );
 460
 461    render_world_routes( world, cam, layer_depth );
 462    render_world_standard( world, cam );
 463    render_world_vb( world, cam );
 464    render_world_alphatest( world, cam );
 465    render_terrain( world, cam );
 466
 467    /* Render SFD's */
 468    u32 closest = 0;
 469    float min_dist = INFINITY;
 470
 471    if( !mdl_arrcount( &world->ent_route ) )
 472       return;
 473
 474    for( u32 i=0; i<mdl_arrcount( &world->ent_route ); i++ ){
 475       ent_route *route = mdl_arritm( &world->ent_route, i );
 476       float dist = v3_dist2( route->board_transform[3], cam->pos );
 477
 478       if( dist < min_dist ){
 479          min_dist = dist;
 480          closest = i;
 481       }
 482    }
 483
 484    ent_route *route = mdl_arritm( &world->ent_route, closest );
 485    sfd_render( world, cam, route->board_transform );
 486 }
 487
 488 VG_STATIC void render_world_depth( world_instance *world, camera *cam )
 489 {
 490    m4x3f identity_matrix;
 491    m4x3_identity( identity_matrix );
 492
 493    shader_scene_depth_use();
 494    shader_scene_depth_uCamera( cam->transform[3] );
 495    shader_scene_depth_uPv( cam->mtx.pv );
 496    shader_scene_depth_uPvmPrev( cam->mtx_prev.pv );
 497    shader_scene_depth_uMdl( identity_matrix );
 498    world_link_lighting_ub( world, _shader_scene_depth.id );
 499
 500    mesh_bind( &world->mesh_geo );
 501    mesh_draw( &world->mesh_geo );
 502 }
 503
 504 VG_STATIC void render_world_position( world_instance *world, camera *cam )
 505 {
 506    m4x3f identity_matrix;
 507    m4x3_identity( identity_matrix );
 508
 509    shader_scene_position_use();
 510    shader_scene_position_uCamera( cam->transform[3] );
 511    shader_scene_position_uPv( cam->mtx.pv );
 512    shader_scene_position_uPvmPrev( cam->mtx_prev.pv );
 513    shader_scene_position_uMdl( identity_matrix );
 514    world_link_lighting_ub( world, _shader_scene_position.id );
 515
 516    mesh_bind( &world->mesh_geo );
 517    mesh_draw( &world->mesh_geo );
 518 }
 519
 520 #endif /* WORLD_RENDER_H */