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    shader_scene_vertex_blend_uBoard0( TEMP_BOARD_0 );
 187    shader_scene_vertex_blend_uBoard1( TEMP_BOARD_1 );
 188
 189    world_render_both_stages( world, k_shader_standard_vertex_blend,
 190                              bindpoint_diffuse_texture1 );
 191 }
 192
 193 VG_STATIC void render_world_standard( world_instance *world, camera *cam )
 194 {
 195    m4x3f identity_matrix;
 196    m4x3_identity( identity_matrix );
 197
 198    shader_scene_standard_use();
 199    shader_scene_standard_uTexGarbage(0);
 200    shader_scene_standard_uTexMain(1);
 201    shader_scene_standard_uPv( cam->mtx.pv );
 202    shader_scene_standard_uPvmPrev( cam->mtx_prev.pv );
 203
 204    world_link_lighting_ub( world, _shader_scene_standard.id );
 205    world_bind_position_texture( world, _shader_scene_standard.id,
 206                                 _uniform_scene_standard_g_world_depth, 2 );
 207    world_bind_light_array( world, _shader_scene_standard.id,
 208                                 _uniform_scene_standard_uLightsArray, 3 );
 209    world_bind_light_index( world, _shader_scene_standard.id,
 210                                 _uniform_scene_standard_uLightsIndex, 4 );
 211
 212    bind_terrain_noise();
 213
 214    shader_scene_standard_uMdl( identity_matrix );
 215    shader_scene_standard_uCamera( cam->transform[3] );
 216    shader_scene_standard_uBoard0( TEMP_BOARD_0 );
 217    shader_scene_standard_uBoard1( TEMP_BOARD_1 );
 218
 219    world_render_both_stages( world, k_shader_standard,
 220                              bindpoint_diffuse_texture1 );
 221 }
 222
 223 VG_STATIC void render_world_alphatest( world_instance *world, camera *cam )
 224 {
 225    m4x3f identity_matrix;
 226    m4x3_identity( identity_matrix );
 227
 228    shader_scene_standard_alphatest_use();
 229    shader_scene_standard_alphatest_uTexGarbage(0);
 230    shader_scene_standard_alphatest_uTexMain(1);
 231    shader_scene_standard_alphatest_uPv( cam->mtx.pv );
 232    shader_scene_standard_alphatest_uPvmPrev( cam->mtx_prev.pv );
 233
 234    world_link_lighting_ub( world, _shader_scene_standard_alphatest.id );
 235    world_bind_position_texture( world, _shader_scene_standard_alphatest.id,
 236                         _uniform_scene_standard_alphatest_g_world_depth, 2 );
 237    world_bind_light_array( world, _shader_scene_standard_alphatest.id,
 238                         _uniform_scene_standard_alphatest_uLightsArray, 3 );
 239    world_bind_light_index( world, _shader_scene_standard_alphatest.id,
 240                            _uniform_scene_standard_alphatest_uLightsIndex, 4 );
 241
 242
 243    bind_terrain_noise();
 244
 245    shader_scene_standard_alphatest_uMdl( identity_matrix );
 246    shader_scene_standard_alphatest_uCamera( cam->transform[3] );
 247    shader_scene_standard_alphatest_uBoard0( TEMP_BOARD_0 );
 248    shader_scene_standard_alphatest_uBoard1( TEMP_BOARD_1 );
 249
 250    glDisable(GL_CULL_FACE);
 251
 252    world_render_both_stages( world, k_shader_standard_cutout,
 253                              bindpoint_diffuse_texture1 );
 254
 255    glEnable(GL_CULL_FACE);
 256 }
 257
 258 VG_STATIC void bindpoint_terrain( world_instance *world,
 259                                   struct world_surface *mat )
 260 {
 261    glActiveTexture( GL_TEXTURE1 );
 262    glBindTexture( GL_TEXTURE_2D, world->textures[ mat->info.tex_diffuse ] );
 263
 264    shader_scene_terrain_uSandColour( mat->info.colour );
 265    shader_scene_terrain_uBlendOffset( mat->info.colour1 );
 266 }
 267
 268 VG_STATIC void render_terrain( world_instance *world, camera *cam )
 269 {
 270    m4x3f identity_matrix;
 271    m4x3_identity( identity_matrix );
 272
 273    shader_scene_terrain_use();
 274    shader_scene_terrain_uTexGarbage(0);
 275    shader_scene_terrain_uTexGradients(1);
 276
 277    world_link_lighting_ub( world, _shader_scene_terrain.id );
 278    world_bind_position_texture( world, _shader_scene_terrain.id,
 279                         _uniform_scene_terrain_g_world_depth, 2 );
 280    world_bind_light_array( world, _shader_scene_terrain.id,
 281                         _uniform_scene_terrain_uLightsArray, 3 );
 282    world_bind_light_index( world, _shader_scene_terrain.id,
 283                            _uniform_scene_terrain_uLightsIndex, 4 );
 284
 285    vg_tex2d_bind( &tex_terrain_noise, 0 );
 286
 287    shader_scene_terrain_uPv( cam->mtx.pv );
 288    shader_scene_terrain_uPvmPrev( cam->mtx_prev.pv );
 289
 290    shader_scene_terrain_uMdl( identity_matrix );
 291    shader_scene_terrain_uCamera( cam->transform[3] );
 292    shader_scene_terrain_uBoard0( TEMP_BOARD_0 );
 293    shader_scene_terrain_uBoard1( TEMP_BOARD_1 );
 294
 295    world_render_both_stages( world, k_shader_terrain_blend, bindpoint_terrain );
 296 }
 297
 298 VG_STATIC void render_sky( world_instance *world, camera *cam )
 299 {
 300    /*
 301     * Modify matrix to remove clipping and view translation
 302     */
 303    m4x4f v,
 304          v_prev,
 305          pv,
 306          pv_prev;
 307
 308    m4x4_copy( cam->mtx.v, v );
 309    m4x4_copy( cam->mtx_prev.v, v_prev );
 310    v3_zero( v[3] );
 311    v3_zero( v_prev[3] );
 312
 313    m4x4_copy( cam->mtx.p,      pv );
 314    m4x4_copy( cam->mtx_prev.p, pv_prev );
 315    m4x4_reset_clipping( pv,      cam->farz, cam->nearz );
 316    m4x4_reset_clipping( pv_prev, cam->farz, cam->nearz );
 317
 318    m4x4_mul( pv,      v,      pv );
 319    m4x4_mul( pv_prev, v_prev, pv_prev );
 320
 321    m4x3f identity_matrix;
 322    m4x3_identity( identity_matrix );
 323
 324    /*
 325     * Draw
 326     */
 327    shader_model_sky_use();
 328    shader_model_sky_uMdl( identity_matrix );
 329    shader_model_sky_uPv( pv );
 330    shader_model_sky_uPvmPrev( pv_prev );
 331    shader_model_sky_uTexGarbage(0);
 332    world_link_lighting_ub( world, _shader_model_sky.id );
 333
 334    vg_tex2d_bind( &tex_terrain_noise, 0 );
 335
 336    glDepthMask( GL_FALSE );
 337    glDisable( GL_DEPTH_TEST );
 338
 339    mesh_bind( &world_global.skydome );
 340    mesh_draw( &world_global.skydome );
 341
 342    glEnable( GL_DEPTH_TEST );
 343    glDepthMask( GL_TRUE );
 344 }
 345
 346 VG_STATIC void render_world_gates( world_instance *world, camera *cam,
 347                                    int layer_depth )
 348 {
 349    float closest = INFINITY;
 350
 351    struct ent_gate *gate = NULL;
 352
 353    for( u32 i=0; i<mdl_arrcount(&world->ent_gate); i++ ){
 354       ent_gate *gi = mdl_arritm( &world->ent_gate, i );
 355
 356       if( gi->type == k_gate_type_unlinked )
 357          continue;
 358
 359       float dist = v3_dist2( gi->co[0], cam->transform[3] );
 360
 361       vg_line_pt3( gi->co[0], 0.25f, VG__BLUE );
 362
 363       if( dist < closest ){
 364          closest = dist;
 365          gate = gi;
 366       }
 367    }
 368
 369    if( gate ){
 370 #if 0
 371       world_instance *dest_world = &world_global.worlds[ gate->world_index ];
 372       render_gate( dest_world, gate, cam, layer_depth );
 373 #else
 374       render_gate( world, gate, cam, layer_depth );
 375 #endif
 376
 377       /* should really be set in fixed update since its used in the physics
 378        * of most systems. too bad! */
 379       world->rendering_gate = gate;
 380    }
 381 }
 382
 383 VG_STATIC void render_world( world_instance *world, camera *cam,
 384                              int layer_depth )
 385 {
 386    render_sky( world, cam );
 387
 388    render_world_routes( world, cam, layer_depth );
 389    render_world_standard( world, cam );
 390    render_world_vb( world, cam );
 391    render_world_alphatest( world, cam );
 392    render_terrain( world, cam );
 393
 394    /* Render SFD's */
 395    u32 closest = 0;
 396    float min_dist = INFINITY;
 397
 398    if( !mdl_arrcount( &world->ent_route ) )
 399       return;
 400
 401    for( u32 i=0; i<mdl_arrcount( &world->ent_route ); i++ ){
 402       ent_route *route = mdl_arritm( &world->ent_route, i );
 403       float dist = v3_dist2( route->board_transform[3], cam->pos );
 404
 405       if( dist < min_dist ){
 406          min_dist = dist;
 407          closest = i;
 408       }
 409    }
 410
 411    ent_route *route = mdl_arritm( &world->ent_route, closest );
 412    sfd_render( world, cam, route->board_transform );
 413 }
 414
 415 VG_STATIC void render_world_depth( world_instance *world, camera *cam )
 416 {
 417    m4x3f identity_matrix;
 418    m4x3_identity( identity_matrix );
 419
 420    shader_scene_depth_use();
 421    shader_scene_depth_uCamera( cam->transform[3] );
 422    shader_scene_depth_uPv( cam->mtx.pv );
 423    shader_scene_depth_uPvmPrev( cam->mtx_prev.pv );
 424    shader_scene_depth_uMdl( identity_matrix );
 425    world_link_lighting_ub( world, _shader_scene_depth.id );
 426
 427    mesh_bind( &world->mesh_geo );
 428    mesh_draw( &world->mesh_geo );
 429 }
 430
 431 VG_STATIC void render_world_position( world_instance *world, camera *cam )
 432 {
 433    m4x3f identity_matrix;
 434    m4x3_identity( identity_matrix );
 435
 436    shader_scene_position_use();
 437    shader_scene_position_uCamera( cam->transform[3] );
 438    shader_scene_position_uPv( cam->mtx.pv );
 439    shader_scene_position_uPvmPrev( cam->mtx_prev.pv );
 440    shader_scene_position_uMdl( identity_matrix );
 441    world_link_lighting_ub( world, _shader_scene_position.id );
 442
 443    mesh_bind( &world->mesh_geo );
 444    mesh_draw( &world->mesh_geo );
 445 }
 446
 447 #endif /* WORLD_RENDER_H */