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          /* TODO: We could get away with this being R16u, and just have it be
  52           *       a normed value between min and max of the bounding box Y */
  53
  54          fb->attachments[0].display_name     = NULL;
  55          fb->attachments[0].purpose = k_framebuffer_attachment_type_colour;
  56          fb->attachments[0].internalformat   = GL_RG16F;
  57          fb->attachments[0].format           = GL_RG;
  58          fb->attachments[0].type             = GL_FLOAT;
  59          fb->attachments[0].attachment       = GL_COLOR_ATTACHMENT0;
  60
  61          fb->attachments[1].purpose = k_framebuffer_attachment_type_none;
  62          fb->attachments[2].purpose = k_framebuffer_attachment_type_none;
  63          fb->attachments[3].purpose = k_framebuffer_attachment_type_none;
  64          fb->attachments[4].purpose = k_framebuffer_attachment_type_none;
  65
  66          render_fb_allocate( fb );
  67       }
  68    }
  69    vg_release_thread_sync();
  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    vg_tex2d_bind( &tex_terrain_noise, 0 );
 113 }
 114
 115 typedef void (*func_bind_point)( world_instance *world,
 116                                  struct world_surface *mat );
 117
 118 VG_STATIC void world_render_if( world_instance *world,
 119                                 enum mdl_shader shader,
 120                                 enum geo_type geo_type,
 121                                 func_bind_point bind_point )
 122 {
 123
 124    for( int i=0; i<world->surface_count; i++ )
 125    {
 126       struct world_surface *mat = &world->surfaces[i];
 127
 128       if( mat->info.shader == shader )
 129       {
 130          mdl_submesh *sm;
 131
 132          if( geo_type == k_geo_type_solid )
 133             sm = &mat->sm_geo;
 134          else
 135             sm = &mat->sm_no_collide;
 136
 137          if( !sm->indice_count )
 138             continue;
 139
 140          bind_point( world, mat );
 141          mdl_draw_submesh( sm );
 142       }
 143    }
 144 }
 145
 146 VG_STATIC
 147 void world_render_both_stages(  world_instance *world,
 148                                 enum mdl_shader shader,
 149                                 func_bind_point bind_point )
 150 {
 151    mesh_bind( &world->mesh_geo );
 152    world_render_if( world, shader, k_geo_type_solid, bind_point );
 153
 154    glDisable( GL_CULL_FACE );
 155    mesh_bind( &world->mesh_no_collide );
 156    world_render_if( world, shader, k_geo_type_nonsolid, bind_point );
 157    glEnable( GL_CULL_FACE );
 158 }
 159
 160 VG_STATIC void bindpoint_diffuse_texture1( world_instance *world,
 161                                            struct world_surface *mat )
 162 {
 163    glActiveTexture( GL_TEXTURE1 );
 164    glBindTexture( GL_TEXTURE_2D, world->textures[ mat->info.tex_diffuse ] );
 165 }
 166
 167 VG_STATIC void render_world_vb( world_instance *world, camera *cam )
 168 {
 169    m4x3f identity_matrix;
 170    m4x3_identity( identity_matrix );
 171
 172    shader_scene_vertex_blend_use();
 173    shader_scene_vertex_blend_uTexGarbage(0);
 174    shader_scene_vertex_blend_uTexGradients(1);
 175    world_link_lighting_ub( world, _shader_scene_vertex_blend.id );
 176    world_bind_position_texture( world, _shader_scene_vertex_blend.id,
 177                                 _uniform_scene_vertex_blend_g_world_depth, 2 );
 178    world_bind_light_array( world, _shader_scene_vertex_blend.id,
 179                                 _uniform_scene_vertex_blend_uLightsArray, 3 );
 180    world_bind_light_index( world, _shader_scene_vertex_blend.id,
 181                                 _uniform_scene_vertex_blend_uLightsIndex, 4 );
 182
 183    vg_tex2d_bind( &tex_terrain_noise, 0 );
 184
 185    shader_scene_vertex_blend_uPv( cam->mtx.pv );
 186    shader_scene_vertex_blend_uPvmPrev( cam->mtx_prev.pv );
 187    shader_scene_vertex_blend_uMdl( identity_matrix );
 188    shader_scene_vertex_blend_uCamera( cam->transform[3] );
 189    shader_scene_vertex_blend_uBoard0( TEMP_BOARD_0 );
 190    shader_scene_vertex_blend_uBoard1( TEMP_BOARD_1 );
 191
 192    world_render_both_stages( world, k_shader_standard_vertex_blend,
 193                              bindpoint_diffuse_texture1 );
 194 }
 195
 196 VG_STATIC void render_world_standard( world_instance *world, camera *cam )
 197 {
 198    m4x3f identity_matrix;
 199    m4x3_identity( identity_matrix );
 200
 201    shader_scene_standard_use();
 202    shader_scene_standard_uTexGarbage(0);
 203    shader_scene_standard_uTexMain(1);
 204    shader_scene_standard_uPv( cam->mtx.pv );
 205    shader_scene_standard_uPvmPrev( cam->mtx_prev.pv );
 206
 207    world_link_lighting_ub( world, _shader_scene_standard.id );
 208    world_bind_position_texture( world, _shader_scene_standard.id,
 209                                 _uniform_scene_standard_g_world_depth, 2 );
 210    world_bind_light_array( world, _shader_scene_standard.id,
 211                                 _uniform_scene_standard_uLightsArray, 3 );
 212    world_bind_light_index( world, _shader_scene_standard.id,
 213                                 _uniform_scene_standard_uLightsIndex, 4 );
 214
 215    bind_terrain_noise();
 216
 217    shader_scene_standard_uMdl( identity_matrix );
 218    shader_scene_standard_uCamera( cam->transform[3] );
 219    shader_scene_standard_uBoard0( TEMP_BOARD_0 );
 220    shader_scene_standard_uBoard1( TEMP_BOARD_1 );
 221
 222    world_render_both_stages( world, k_shader_standard,
 223                              bindpoint_diffuse_texture1 );
 224 }
 225
 226 VG_STATIC void render_world_alphatest( world_instance *world, camera *cam )
 227 {
 228    m4x3f identity_matrix;
 229    m4x3_identity( identity_matrix );
 230
 231    shader_scene_standard_alphatest_use();
 232    shader_scene_standard_alphatest_uTexGarbage(0);
 233    shader_scene_standard_alphatest_uTexMain(1);
 234    shader_scene_standard_alphatest_uPv( cam->mtx.pv );
 235    shader_scene_standard_alphatest_uPvmPrev( cam->mtx_prev.pv );
 236
 237    world_link_lighting_ub( world, _shader_scene_standard_alphatest.id );
 238    world_bind_position_texture( world, _shader_scene_standard_alphatest.id,
 239                         _uniform_scene_standard_alphatest_g_world_depth, 2 );
 240    world_bind_light_array( world, _shader_scene_standard_alphatest.id,
 241                         _uniform_scene_standard_alphatest_uLightsArray, 3 );
 242    world_bind_light_index( world, _shader_scene_standard_alphatest.id,
 243                            _uniform_scene_standard_alphatest_uLightsIndex, 4 );
 244
 245
 246    bind_terrain_noise();
 247
 248    shader_scene_standard_alphatest_uMdl( identity_matrix );
 249    shader_scene_standard_alphatest_uCamera( cam->transform[3] );
 250    shader_scene_standard_alphatest_uBoard0( TEMP_BOARD_0 );
 251    shader_scene_standard_alphatest_uBoard1( TEMP_BOARD_1 );
 252
 253    glDisable(GL_CULL_FACE);
 254
 255    world_render_both_stages( world, k_shader_standard_cutout,
 256                              bindpoint_diffuse_texture1 );
 257
 258    glEnable(GL_CULL_FACE);
 259 }
 260
 261 VG_STATIC void bindpoint_terrain( world_instance *world,
 262                                   struct world_surface *mat )
 263 {
 264    glActiveTexture( GL_TEXTURE1 );
 265    glBindTexture( GL_TEXTURE_2D, world->textures[ mat->info.tex_diffuse ] );
 266
 267    shader_scene_terrain_uSandColour( mat->info.colour );
 268    shader_scene_terrain_uBlendOffset( mat->info.colour1 );
 269 }
 270
 271 VG_STATIC void render_terrain( world_instance *world, camera *cam )
 272 {
 273    m4x3f identity_matrix;
 274    m4x3_identity( identity_matrix );
 275
 276    shader_scene_terrain_use();
 277    shader_scene_terrain_uTexGarbage(0);
 278    shader_scene_terrain_uTexGradients(1);
 279
 280    world_link_lighting_ub( world, _shader_scene_terrain.id );
 281    world_bind_position_texture( world, _shader_scene_terrain.id,
 282                         _uniform_scene_terrain_g_world_depth, 2 );
 283    world_bind_light_array( world, _shader_scene_terrain.id,
 284                         _uniform_scene_terrain_uLightsArray, 3 );
 285    world_bind_light_index( world, _shader_scene_terrain.id,
 286                            _uniform_scene_terrain_uLightsIndex, 4 );
 287
 288    vg_tex2d_bind( &tex_terrain_noise, 0 );
 289
 290    shader_scene_terrain_uPv( cam->mtx.pv );
 291    shader_scene_terrain_uPvmPrev( cam->mtx_prev.pv );
 292
 293    shader_scene_terrain_uMdl( identity_matrix );
 294    shader_scene_terrain_uCamera( cam->transform[3] );
 295    shader_scene_terrain_uBoard0( TEMP_BOARD_0 );
 296    shader_scene_terrain_uBoard1( TEMP_BOARD_1 );
 297
 298    world_render_both_stages( world, k_shader_terrain_blend, bindpoint_terrain );
 299 }
 300
 301 VG_STATIC void render_sky( world_instance *world, camera *cam )
 302 {
 303    /*
 304     * Modify matrix to remove clipping and view translation
 305     */
 306    m4x4f v,
 307          v_prev,
 308          pv,
 309          pv_prev;
 310
 311    m4x4_copy( cam->mtx.v, v );
 312    m4x4_copy( cam->mtx_prev.v, v_prev );
 313    v3_zero( v[3] );
 314    v3_zero( v_prev[3] );
 315
 316    m4x4_copy( cam->mtx.p,      pv );
 317    m4x4_copy( cam->mtx_prev.p, pv_prev );
 318    m4x4_reset_clipping( pv,      cam->farz, cam->nearz );
 319    m4x4_reset_clipping( pv_prev, cam->farz, cam->nearz );
 320
 321    m4x4_mul( pv,      v,      pv );
 322    m4x4_mul( pv_prev, v_prev, pv_prev );
 323
 324    m4x3f identity_matrix;
 325    m4x3_identity( identity_matrix );
 326
 327    /*
 328     * Draw
 329     */
 330    shader_model_sky_use();
 331    shader_model_sky_uMdl( identity_matrix );
 332    shader_model_sky_uPv( pv );
 333    shader_model_sky_uPvmPrev( pv_prev );
 334    shader_model_sky_uTexGarbage(0);
 335    world_link_lighting_ub( world, _shader_model_sky.id );
 336
 337    vg_tex2d_bind( &tex_terrain_noise, 0 );
 338
 339    glDepthMask( GL_FALSE );
 340    glDisable( GL_DEPTH_TEST );
 341
 342    mesh_bind( &world_global.skydome );
 343    mesh_draw( &world_global.skydome );
 344
 345    glEnable( GL_DEPTH_TEST );
 346    glDepthMask( GL_TRUE );
 347 }
 348
 349 VG_STATIC void render_world_gates( world_instance *world, camera *cam,
 350                                    int layer_depth )
 351 {
 352    float closest = INFINITY;
 353
 354    struct ent_gate *gate = NULL;
 355
 356    for( u32 i=0; i<mdl_arrcount(&world->ent_gate); i++ ){
 357       ent_gate *gi = mdl_arritm( &world->ent_gate, i );
 358
 359       if( gi->type == k_gate_type_unlinked )
 360          continue;
 361
 362       float dist = v3_dist2( gi->co[0], cam->transform[3] );
 363
 364       vg_line_pt3( gi->co[0], 0.25f, VG__BLUE );
 365
 366       if( dist < closest ){
 367          closest = dist;
 368          gate = gi;
 369       }
 370    }
 371
 372    if( gate ){
 373 #if 0
 374       world_instance *dest_world = &world_global.worlds[ gate->world_index ];
 375       render_gate( dest_world, gate, cam, layer_depth );
 376 #else
 377       render_gate( world, gate, cam, layer_depth );
 378 #endif
 379
 380       /* should really be set in fixed update since its used in the physics
 381        * of most systems. too bad! */
 382       world->rendering_gate = gate;
 383    }
 384 }
 385
 386 VG_STATIC void render_world( world_instance *world, camera *cam,
 387                              int layer_depth )
 388 {
 389    render_sky( world, cam );
 390
 391    render_world_routes( world, cam, layer_depth );
 392    render_world_standard( world, cam );
 393    render_world_vb( world, cam );
 394    render_world_alphatest( world, cam );
 395    render_terrain( world, cam );
 396
 397    /* Render SFD's */
 398    u32 closest = 0;
 399    float min_dist = INFINITY;
 400
 401    if( !mdl_arrcount( &world->ent_route ) )
 402       return;
 403
 404    for( u32 i=0; i<mdl_arrcount( &world->ent_route ); i++ ){
 405       ent_route *route = mdl_arritm( &world->ent_route, i );
 406       float dist = v3_dist2( route->board_transform[3], cam->pos );
 407
 408       if( dist < min_dist ){
 409          min_dist = dist;
 410          closest = i;
 411       }
 412    }
 413
 414    ent_route *route = mdl_arritm( &world->ent_route, closest );
 415    sfd_render( world, cam, route->board_transform );
 416 }
 417
 418 VG_STATIC void render_world_depth( world_instance *world, camera *cam )
 419 {
 420    m4x3f identity_matrix;
 421    m4x3_identity( identity_matrix );
 422
 423    shader_scene_depth_use();
 424    shader_scene_depth_uCamera( cam->transform[3] );
 425    shader_scene_depth_uPv( cam->mtx.pv );
 426    shader_scene_depth_uPvmPrev( cam->mtx_prev.pv );
 427    shader_scene_depth_uMdl( identity_matrix );
 428    world_link_lighting_ub( world, _shader_scene_depth.id );
 429
 430    mesh_bind( &world->mesh_geo );
 431    mesh_draw( &world->mesh_geo );
 432 }
 433
 434 VG_STATIC void render_world_position( world_instance *world, camera *cam )
 435 {
 436    m4x3f identity_matrix;
 437    m4x3_identity( identity_matrix );
 438
 439    shader_scene_position_use();
 440    shader_scene_position_uCamera( cam->transform[3] );
 441    shader_scene_position_uPv( cam->mtx.pv );
 442    shader_scene_position_uPvmPrev( cam->mtx_prev.pv );
 443    shader_scene_position_uMdl( identity_matrix );
 444    world_link_lighting_ub( world, _shader_scene_position.id );
 445
 446    mesh_bind( &world->mesh_geo );
 447    mesh_draw( &world->mesh_geo );
 448 }
 449
 450 #endif /* WORLD_RENDER_H */