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_colour;
  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 typedef void (*func_bind_point)( world_instance *world,
 113                                  struct world_surface *mat );
 114
 115 VG_STATIC void world_render_if( world_instance *world,
 116                                 enum mdl_shader shader,
 117                                 enum geo_type geo_type,
 118                                 func_bind_point bind_point )
 119 {
 120
 121    for( int i=0; i<world->surface_count; i++ )
 122    {
 123       struct world_surface *mat = &world->surfaces[i];
 124
 125       if( mat->info.shader == shader )
 126       {
 127          mdl_submesh *sm;
 128
 129          if( geo_type == k_geo_type_solid )
 130             sm = &mat->sm_geo;
 131          else
 132             sm = &mat->sm_no_collide;
 133
 134          if( !sm->indice_count )
 135             continue;
 136
 137          bind_point( world, mat );
 138          mdl_draw_submesh( sm );
 139       }
 140    }
 141 }
 142
 143 VG_STATIC
 144 void world_render_both_stages(  world_instance *world,
 145                                 enum mdl_shader shader,
 146                                 func_bind_point bind_point )
 147 {
 148    mesh_bind( &world->mesh_geo );
 149    world_render_if( world, shader, k_geo_type_solid, bind_point );
 150
 151    glDisable( GL_CULL_FACE );
 152    mesh_bind( &world->mesh_no_collide );
 153    world_render_if( world, shader, k_geo_type_nonsolid, bind_point );
 154    glEnable( GL_CULL_FACE );
 155 }
 156
 157 VG_STATIC void bindpoint_diffuse_texture1( world_instance *world,
 158                                            struct world_surface *mat )
 159 {
 160    glActiveTexture( GL_TEXTURE1 );
 161    glBindTexture( GL_TEXTURE_2D, world->textures[ mat->info.tex_diffuse ] );
 162 }
 163
 164 VG_STATIC void render_world_vb( world_instance *world, camera *cam )
 165 {
 166    m4x3f identity_matrix;
 167    m4x3_identity( identity_matrix );
 168
 169    shader_scene_vertex_blend_use();
 170    shader_scene_vertex_blend_uTexGarbage(0);
 171    shader_scene_vertex_blend_uTexGradients(1);
 172    world_link_lighting_ub( world, _shader_scene_vertex_blend.id );
 173    world_bind_position_texture( world, _shader_scene_vertex_blend.id,
 174                                 _uniform_scene_vertex_blend_g_world_depth, 2 );
 175    world_bind_light_array( world, _shader_scene_vertex_blend.id,
 176                                 _uniform_scene_vertex_blend_uLightsArray, 3 );
 177    world_bind_light_index( world, _shader_scene_vertex_blend.id,
 178                                 _uniform_scene_vertex_blend_uLightsIndex, 4 );
 179
 180    vg_tex2d_bind( &tex_terrain_noise, 0 );
 181
 182    shader_scene_vertex_blend_uPv( cam->mtx.pv );
 183    shader_scene_vertex_blend_uPvmPrev( cam->mtx_prev.pv );
 184    shader_scene_vertex_blend_uMdl( identity_matrix );
 185    shader_scene_vertex_blend_uCamera( cam->transform[3] );
 186
 187    world_render_both_stages( world, k_shader_standard_vertex_blend,
 188                              bindpoint_diffuse_texture1 );
 189 }
 190
 191 VG_STATIC void render_world_standard( world_instance *world, camera *cam )
 192 {
 193    m4x3f identity_matrix;
 194    m4x3_identity( identity_matrix );
 195
 196    shader_scene_standard_use();
 197    shader_scene_standard_uTexGarbage(0);
 198    shader_scene_standard_uTexMain(1);
 199    shader_scene_standard_uPv( cam->mtx.pv );
 200    shader_scene_standard_uPvmPrev( cam->mtx_prev.pv );
 201
 202    world_link_lighting_ub( world, _shader_scene_standard.id );
 203    world_bind_position_texture( world, _shader_scene_standard.id,
 204                                 _uniform_scene_standard_g_world_depth, 2 );
 205    world_bind_light_array( world, _shader_scene_standard.id,
 206                                 _uniform_scene_standard_uLightsArray, 3 );
 207    world_bind_light_index( world, _shader_scene_standard.id,
 208                                 _uniform_scene_standard_uLightsIndex, 4 );
 209
 210    bind_terrain_noise();
 211
 212    shader_scene_standard_uMdl( identity_matrix );
 213    shader_scene_standard_uCamera( cam->transform[3] );
 214
 215    world_render_both_stages( world, k_shader_standard,
 216                              bindpoint_diffuse_texture1 );
 217 }
 218
 219 VG_STATIC void render_world_alphatest( world_instance *world, camera *cam )
 220 {
 221    m4x3f identity_matrix;
 222    m4x3_identity( identity_matrix );
 223
 224    shader_scene_standard_alphatest_use();
 225    shader_scene_standard_alphatest_uTexGarbage(0);
 226    shader_scene_standard_alphatest_uTexMain(1);
 227    shader_scene_standard_alphatest_uPv( cam->mtx.pv );
 228    shader_scene_standard_alphatest_uPvmPrev( cam->mtx_prev.pv );
 229
 230    world_link_lighting_ub( world, _shader_scene_standard_alphatest.id );
 231    world_bind_position_texture( world, _shader_scene_standard_alphatest.id,
 232                         _uniform_scene_standard_alphatest_g_world_depth, 2 );
 233    world_bind_light_array( world, _shader_scene_standard_alphatest.id,
 234                         _uniform_scene_standard_alphatest_uLightsArray, 3 );
 235    world_bind_light_index( world, _shader_scene_standard_alphatest.id,
 236                            _uniform_scene_standard_alphatest_uLightsIndex, 4 );
 237
 238
 239    bind_terrain_noise();
 240
 241    shader_scene_standard_alphatest_uMdl( identity_matrix );
 242    shader_scene_standard_alphatest_uCamera( cam->transform[3] );
 243
 244    glDisable(GL_CULL_FACE);
 245
 246    world_render_both_stages( world, k_shader_standard_cutout,
 247                              bindpoint_diffuse_texture1 );
 248
 249    glEnable(GL_CULL_FACE);
 250 }
 251
 252 VG_STATIC void bindpoint_terrain( world_instance *world,
 253                                   struct world_surface *mat )
 254 {
 255    glActiveTexture( GL_TEXTURE1 );
 256    glBindTexture( GL_TEXTURE_2D, world->textures[ mat->info.tex_diffuse ] );
 257
 258    shader_scene_terrain_uSandColour( mat->info.colour );
 259    shader_scene_terrain_uBlendOffset( mat->info.colour1 );
 260 }
 261
 262 VG_STATIC void render_terrain( world_instance *world, camera *cam )
 263 {
 264    m4x3f identity_matrix;
 265    m4x3_identity( identity_matrix );
 266
 267    shader_scene_terrain_use();
 268    shader_scene_terrain_uTexGarbage(0);
 269    shader_scene_terrain_uTexGradients(1);
 270
 271    world_link_lighting_ub( world, _shader_scene_terrain.id );
 272    world_bind_position_texture( world, _shader_scene_terrain.id,
 273                         _uniform_scene_terrain_g_world_depth, 2 );
 274    world_bind_light_array( world, _shader_scene_terrain.id,
 275                         _uniform_scene_terrain_uLightsArray, 3 );
 276    world_bind_light_index( world, _shader_scene_terrain.id,
 277                            _uniform_scene_terrain_uLightsIndex, 4 );
 278
 279    vg_tex2d_bind( &tex_terrain_noise, 0 );
 280
 281    shader_scene_terrain_uPv( cam->mtx.pv );
 282    shader_scene_terrain_uPvmPrev( cam->mtx_prev.pv );
 283
 284    shader_scene_terrain_uMdl( identity_matrix );
 285    shader_scene_terrain_uCamera( cam->transform[3] );
 286
 287    world_render_both_stages( world, k_shader_terrain_blend, bindpoint_terrain );
 288 }
 289
 290 VG_STATIC void render_sky( world_instance *world, camera *cam )
 291 {
 292    /*
 293     * Modify matrix to remove clipping and view translation
 294     */
 295    m4x4f v,
 296          v_prev,
 297          pv,
 298          pv_prev;
 299
 300    m4x4_copy( cam->mtx.v, v );
 301    m4x4_copy( cam->mtx_prev.v, v_prev );
 302    v3_zero( v[3] );
 303    v3_zero( v_prev[3] );
 304
 305    m4x4_copy( cam->mtx.p,      pv );
 306    m4x4_copy( cam->mtx_prev.p, pv_prev );
 307    m4x4_reset_clipping( pv,      cam->farz, cam->nearz );
 308    m4x4_reset_clipping( pv_prev, cam->farz, cam->nearz );
 309
 310    m4x4_mul( pv,      v,      pv );
 311    m4x4_mul( pv_prev, v_prev, pv_prev );
 312
 313    m4x3f identity_matrix;
 314    m4x3_identity( identity_matrix );
 315
 316    /*
 317     * Draw
 318     */
 319    shader_model_sky_use();
 320    shader_model_sky_uMdl( identity_matrix );
 321    shader_model_sky_uPv( pv );
 322    shader_model_sky_uPvmPrev( pv_prev );
 323    shader_model_sky_uTexGarbage(0);
 324    world_link_lighting_ub( world, _shader_model_sky.id );
 325
 326    vg_tex2d_bind( &tex_terrain_noise, 0 );
 327
 328    glDepthMask( GL_FALSE );
 329    glDisable( GL_DEPTH_TEST );
 330
 331    mesh_bind( &world_global.skydome );
 332    mesh_draw( &world_global.skydome );
 333
 334    glEnable( GL_DEPTH_TEST );
 335    glDepthMask( GL_TRUE );
 336 }
 337
 338 VG_STATIC void render_world_gates( world_instance *world, camera *cam,
 339                                    int layer_depth )
 340 {
 341    float closest = INFINITY;
 342
 343    struct ent_gate *gate = NULL;
 344
 345    for( u32 i=0; i<mdl_arrcount(&world->ent_gate); i++ ){
 346       ent_gate *gi = mdl_arritm( &world->ent_gate, i );
 347
 348       if( gi->type == k_gate_type_unlinked )
 349          continue;
 350
 351       float dist = v3_dist2( gi->co[0], cam->transform[3] );
 352
 353       vg_line_pt3( gi->co[0], 0.25f, VG__BLUE );
 354
 355       if( dist < closest ){
 356          closest = dist;
 357          gate = gi;
 358       }
 359    }
 360
 361    if( gate ){
 362       /* should really be set in fixed update since its used in the physics
 363        * of most systems. too bad! */
 364       world->rendering_gate = gate;
 365
 366       if( gate->type == k_gate_type_teleport ){
 367          render_gate( world, gate, cam, layer_depth );
 368       }
 369       else if( gate->type == k_gate_type_nonlocel ){
 370          world_instance *dest_world = &world_global.worlds[ gate->target ];
 371          render_gate( dest_world, gate, cam, layer_depth );
 372       }
 373       else
 374          world->rendering_gate = NULL;
 375    }
 376 }
 377
 378 VG_STATIC void world_prerender( world_instance *world )
 379 {
 380    static double g_time = 0.0;
 381    g_time += vg.time_delta * (1.0/(k_day_length*60.0));
 382
 383    struct ub_world_lighting *state = &world->ub_lighting;
 384
 385    state->g_time = g_time;
 386    state->g_realtime = vg.time;
 387    state->g_debug_indices = k_debug_light_indices;
 388    state->g_light_preview = k_light_preview;
 389    state->g_debug_complexity = k_debug_light_complexity;
 390
 391    state->g_time_of_day = vg_fractf( g_time );
 392    state->g_day_phase   = cosf( state->g_time_of_day * VG_PIf * 2.0f );
 393    state->g_sunset_phase= cosf( state->g_time_of_day * VG_PIf * 4.0f + VG_PIf );
 394
 395    state->g_day_phase    =       state->g_day_phase    * 0.5f + 0.5f;
 396    state->g_sunset_phase = powf( state->g_sunset_phase * 0.5f + 0.5f, 6.0f );
 397
 398    float a = state->g_time_of_day * VG_PIf * 2.0f;
 399    state->g_sun_dir[0] = sinf( a );
 400    state->g_sun_dir[1] = cosf( a );
 401    state->g_sun_dir[2] = 0.2f;
 402    v3_normalize( state->g_sun_dir );
 403
 404
 405    world->probabilities[ k_probability_curve_constant ] = 1.0f;
 406
 407    float dp = state->g_day_phase;
 408
 409    world->probabilities[ k_probability_curve_wildlife_day ] =
 410       (dp*dp*0.8f+state->g_sunset_phase)*0.8f;
 411    world->probabilities[ k_probability_curve_wildlife_night ] =
 412       1.0f-powf(fabsf((state->g_time_of_day-0.5f)*5.0f),5.0f);
 413
 414
 415    glBindBuffer( GL_UNIFORM_BUFFER, world->ubo_lighting );
 416    glBufferSubData( GL_UNIFORM_BUFFER, 0,
 417                     sizeof(struct ub_world_lighting), &world->ub_lighting );
 418 }
 419
 420 VG_STATIC void render_world( world_instance *world, camera *cam,
 421                              int layer_depth )
 422 {
 423    render_sky( world, cam );
 424
 425    render_world_routes( world, cam, layer_depth );
 426    render_world_standard( world, cam );
 427    render_world_vb( world, cam );
 428    render_world_alphatest( world, cam );
 429    render_terrain( world, cam );
 430
 431    /* Render SFD's */
 432    u32 closest = 0;
 433    float min_dist = INFINITY;
 434
 435    if( !mdl_arrcount( &world->ent_route ) )
 436       return;
 437
 438    for( u32 i=0; i<mdl_arrcount( &world->ent_route ); i++ ){
 439       ent_route *route = mdl_arritm( &world->ent_route, i );
 440       float dist = v3_dist2( route->board_transform[3], cam->pos );
 441
 442       if( dist < min_dist ){
 443          min_dist = dist;
 444          closest = i;
 445       }
 446    }
 447
 448    ent_route *route = mdl_arritm( &world->ent_route, closest );
 449    sfd_render( world, cam, route->board_transform );
 450 }
 451
 452 VG_STATIC void render_world_depth( world_instance *world, camera *cam )
 453 {
 454    m4x3f identity_matrix;
 455    m4x3_identity( identity_matrix );
 456
 457    shader_scene_depth_use();
 458    shader_scene_depth_uCamera( cam->transform[3] );
 459    shader_scene_depth_uPv( cam->mtx.pv );
 460    shader_scene_depth_uPvmPrev( cam->mtx_prev.pv );
 461    shader_scene_depth_uMdl( identity_matrix );
 462    world_link_lighting_ub( world, _shader_scene_depth.id );
 463
 464    mesh_bind( &world->mesh_geo );
 465    mesh_draw( &world->mesh_geo );
 466 }
 467
 468 VG_STATIC void render_world_position( world_instance *world, camera *cam )
 469 {
 470    m4x3f identity_matrix;
 471    m4x3_identity( identity_matrix );
 472
 473    shader_scene_position_use();
 474    shader_scene_position_uCamera( cam->transform[3] );
 475    shader_scene_position_uPv( cam->mtx.pv );
 476    shader_scene_position_uPvmPrev( cam->mtx_prev.pv );
 477    shader_scene_position_uMdl( identity_matrix );
 478    world_link_lighting_ub( world, _shader_scene_position.id );
 479
 480    mesh_bind( &world->mesh_geo );
 481    mesh_draw( &world->mesh_geo );
 482 }
 483
 484 #endif /* WORLD_RENDER_H */