vg.h

   1 /* Copyright (C) 2021-2022 Harry Godden (hgn) - All Rights Reserved */
   2
   3 /*
   4
   5  .-.                           VG Event loop
   6 | 0 |
   7 |   |  .---------------------------------------------------------.
   8 |API| | vg_enter( int argc, char *argv[], const char *window_name |
   9 |   |  '---------------------------------------------------------'
  10 |   |        |
  11 |   |        v
  12 |IMP|  vg_launch_opt(void) <--.
  13 |   |        |                 |
  14 |   |        |'---------------'
  15 |   |        |                                     .-.
  16 |   |        |'-----------------------------------| 1 |------.
  17 |   |        |                                    |   |       |
  18 |   |        |                                    |   |       v
  19 |   |        |                                    |IMP|  vg_preload(void)
  20 |   |        |                                    |   |       |
  21 |   |  .-----+.                                   |   |       v
  22 |   | |        |                                  |IMP|  vg_load(void)
  23 |   | |        v                                  '___'       |
  24 |IMP| |   vg_framebuffer_resize(void)                         |
  25 |   | |        |                                              |
  26 |IMP| |        |.------------- vg_start(void) ---------------'
  27 |   | |        |
  28 |   | |        v
  29 |IMP| |   vg_update(void)
  30 |   | |        |
  31 |   | |  .-----+.
  32 |   | | |        |
  33 |   | | |        v
  34 |IMP| |  '- vg_update_fixed(void)
  35 |   | |          |
  36 |   | |       .-'
  37 |   | |      |
  38 |   | |      v
  39 |IMP| |   vg_update_post(void)
  40 |   | |      |
  41 |   | |      v
  42 |IMP| |   vg_render(void)
  43 |   | |      |
  44 |   | |      v
  45 |IMP| |   vg_ui(void)
  46 |   | |      |
  47 |   |  '----'
  48 '___'
  49
  50  .-.
  51 | ? |
  52 |   |  .-------------------------------------.
  53 |API| | vg_fatal_exit_loop( const char *err ) |
  54 |   |  '-------------------------------------'
  55 |   |         |
  56 |   |  .------+.
  57 |   | |         |
  58 |   | |         v
  59 |IMP|  '- vg_framebuffer_resize(void)
  60 '___'
  61
  62 */
  63
  64 #ifndef VG_STATIC
  65   #define VG_STATIC
  66 #endif
  67
  68 /* API */
  69 VG_STATIC void vg_enter( int argc, char *argv[], const char *window_name );
  70
  71 /* Thread 1 */
  72 VG_STATIC void vg_preload(void);
  73 VG_STATIC void vg_load(void);
  74
  75 /* Main thread */
  76 VG_STATIC void vg_launch_opt(void);
  77 VG_STATIC void vg_start(void);
  78
  79 VG_STATIC void vg_framebuffer_resize(int w, int h);
  80 VG_STATIC void vg_update(void);
  81 VG_STATIC void vg_update_fixed(void);
  82 VG_STATIC void vg_update_post(void);
  83
  84 VG_STATIC void vg_render(void);
  85 VG_STATIC void vg_ui(void);
  86
  87 #ifndef VG_HEADER_H
  88   #define VG_HEADER_H
  89
  90   #include "vg_platform.h"
  91   #include "vg_mem.h"
  92
  93   #ifndef _WIN32
  94     #include <execinfo.h>
  95   #endif
  96
  97   #ifdef VG_GAME
  98     #include "dep/glad/glad.h"
  99     #include "submodules/SDL/include/SDL.h"
 100     #include "vg_stdint.h"
 101
 102     void vg_register_exit( void( *funcptr )(void), const char *name );
 103
 104     #include "vg_m.h"
 105     #include "vg_io.h"
 106     #include "vg_log.h"
 107     #include "vg_steam.h"
 108
 109   //#define VG_SYNC_DEBUG
 110   #ifdef VG_SYNC_DEBUG
 111     #define VG_SYNC_LOG(STR,...) \
 112        vg_info(STR,SDL_GetThreadID(NULL),##__VA_ARGS__)
 113   #else
 114     #define VG_SYNC_LOG(...)
 115   #endif
 116
 117 struct vg
 118 {
 119    /* Engine sync */
 120    SDL_Window     *window;
 121    SDL_GLContext  gl_context;
 122
 123    SDL_SpinLock  sl_context;
 124    SDL_sem      *sem_allow_exec,
 125                 *sem_exec_finished,
 126                 *sem_loader;
 127
 128    SDL_threadID  thread_id_main,
 129                  thread_id_loader,
 130                  thread_id_with_opengl_context;
 131    int           context_ownership_depth;
 132
 133    int exec_context;
 134
 135    enum engine_status
 136    {
 137       k_engine_status_none,
 138       k_engine_status_running,
 139       k_engine_status_crashed
 140    }
 141    engine_status;
 142    const char *str_const_engine_err;
 143    int         is_loaded;
 144
 145    /* Window information */
 146    int window_x,
 147        window_y,
 148        samples,
 149        window_should_close;
 150
 151    float refresh_rate;
 152
 153    double mouse_pos[2];
 154    v2f mouse_delta,
 155        mouse_wheel;
 156
 157    /* Runtime */
 158    double time,
 159           time_delta,
 160           frame_delta,
 161           time_real,
 162           time_real_last,
 163           time_rate,
 164           accumulator;
 165
 166    int fixed_iterations;
 167
 168    enum engine_stage
 169    {
 170       k_engine_stage_none,
 171       k_engine_stage_update,
 172       k_engine_stage_update_fixed,
 173       k_engine_stage_rendering,
 174       k_engine_stage_ui
 175    }
 176    engine_stage;
 177
 178    /* graphics */
 179    m4x4f pv;
 180    enum quality_profile
 181    {
 182       k_quality_profile_high = 0,
 183       k_quality_profile_low = 1,
 184    }
 185    quality_profile;
 186 }
 187 VG_STATIC vg = { .time_rate = 1.0 };
 188
 189 enum vg_thread_purpose
 190 {
 191    k_thread_purpose_nothing,
 192    k_thread_purpose_main,
 193    k_thread_purpose_loader
 194 };
 195
 196 VG_STATIC void vg_fatal_exit_loop( const char *error );
 197
 198 /*
 199  * Checks if the engine is running
 200  */
 201 VG_STATIC void _vg_ensure_engine_running(void)
 202 {
 203    /* Check if the engine is no longer running */
 204    SDL_AtomicLock( &vg.sl_context );
 205    enum engine_status status = vg.engine_status;
 206    SDL_AtomicUnlock( &vg.sl_context );
 207
 208    if( status != k_engine_status_running )
 209    {
 210       while(1)
 211       {
 212          VG_SYNC_LOG( "[%d] No longer running...\n");
 213          SDL_Delay(1000);
 214       }
 215    }
 216 }
 217
 218 VG_STATIC enum vg_thread_purpose vg_thread_purpose(void)
 219 {
 220    SDL_AtomicLock( &vg.sl_context );
 221
 222    if( vg.thread_id_main == SDL_GetThreadID(NULL) )
 223    {
 224       SDL_AtomicUnlock( &vg.sl_context );
 225       return k_thread_purpose_main;
 226    }
 227    else
 228    {
 229       SDL_AtomicUnlock( &vg.sl_context );
 230       return k_thread_purpose_loader;
 231    }
 232 }
 233
 234 /*
 235  * Sync execution so that the OpenGL context is switched onto this thread.
 236  * Anything after this call will be in a valid context.
 237  */
 238 VG_STATIC void vg_acquire_thread_sync(void)
 239 {
 240    /* We dont want to do anything if this is the main thread */
 241
 242    if( vg_thread_purpose() == k_thread_purpose_loader )
 243    {
 244       VG_SYNC_LOG( "[%d] vg_acquire_thread_sync()\n" );
 245       _vg_ensure_engine_running();
 246
 247       SDL_AtomicLock( &vg.sl_context );
 248       if( vg.context_ownership_depth == 0 )
 249       {
 250          vg.context_ownership_depth ++;
 251          vg.exec_context = 1;
 252          SDL_AtomicUnlock( &vg.sl_context );
 253
 254          /* wait until told we can go */
 255          VG_SYNC_LOG( "[%d] Waiting to acuire sync.\n" );
 256          SDL_SemWait( vg.sem_allow_exec );
 257
 258          _vg_ensure_engine_running();
 259
 260          SDL_GL_MakeCurrent( vg.window, vg.gl_context );
 261          VG_SYNC_LOG( "[%d] granted\n" );
 262       }
 263       else
 264       {
 265          vg.context_ownership_depth ++;
 266          VG_SYNC_LOG( "[%d] granted\n" );
 267          SDL_AtomicUnlock( &vg.sl_context );
 268       }
 269    }
 270 }
 271
 272 /*
 273  * Signify that we are done with the OpenGL context in this thread.
 274  * Anything after this call will be in an undefined context.
 275  */
 276 VG_STATIC void vg_release_thread_sync(void)
 277 {
 278    if( vg_thread_purpose() == k_thread_purpose_loader )
 279    {
 280       VG_SYNC_LOG( "[%d] vg_release_thread_sync()\n" );
 281
 282       SDL_AtomicLock( &vg.sl_context );
 283       vg.context_ownership_depth --;
 284
 285       if( vg.context_ownership_depth == 0 )
 286       {
 287          SDL_AtomicUnlock( &vg.sl_context );
 288          VG_SYNC_LOG( "[%d] Releasing context.\n" );
 289          SDL_GL_MakeCurrent( NULL, NULL );
 290          SDL_SemPost( vg.sem_exec_finished );
 291       }
 292       else
 293          SDL_AtomicUnlock( &vg.sl_context );
 294    }
 295 }
 296
 297 VG_STATIC void _vg_run_synced(void)
 298 {
 299    SDL_AtomicLock( &vg.sl_context );
 300
 301    if( vg.exec_context != 0 )
 302    {
 303       VG_SYNC_LOG( "[%d] _vg_run_synced() (%d).\n", vg.exec_context );
 304       vg.exec_context = 0;
 305       SDL_AtomicUnlock( &vg.sl_context );
 306
 307       /* allow operations to go */
 308       SDL_GL_MakeCurrent( NULL, NULL );
 309       SDL_SemPost( vg.sem_allow_exec );
 310
 311       /* wait for operations to complete */
 312       VG_SYNC_LOG( "[%d] Waiting for content.\n" );
 313       SDL_SemWait( vg.sem_exec_finished );
 314
 315       /* check if we killed the engine */
 316       _vg_ensure_engine_running();
 317
 318       /* re-engage main thread */
 319       VG_SYNC_LOG( "[%d] Re-engaging.\n" );
 320       SDL_GL_MakeCurrent( vg.window, vg.gl_context );
 321    }
 322    else
 323    {
 324       VG_SYNC_LOG( "[%d] Nothing to do.\n" );
 325       SDL_AtomicUnlock( &vg.sl_context );
 326    }
 327 }
 328
 329 VG_STATIC void _vg_opengl_sync_init(void)
 330 {
 331    vg.sem_allow_exec = SDL_CreateSemaphore(0);
 332    vg.sem_exec_finished = SDL_CreateSemaphore(0);
 333    vg.sem_loader = SDL_CreateSemaphore(1);
 334 }
 335
 336 VG_STATIC void vg_checkgl( const char *src_info );
 337 #define VG_STRINGIT( X ) #X
 338 #define VG_CHECK_GL_ERR() vg_checkgl( __FILE__ ":L" VG_STRINGIT(__LINE__) )
 339
 340 #include "vg_console.h"
 341 #include "vg_profiler.h"
 342 #include "vg_audio.h"
 343 #include "vg_shader.h"
 344 #include "vg_tex.h"
 345 #include "vg_input.h"
 346 #include "vg_ui.h"
 347 #include "vg_lines.h"
 348 #include "vg_loader.h"
 349 #include "vg_opt.h"
 350
 351 /* Diagnostic */
 352 VG_STATIC struct vg_profile vg_prof_update = {.name="update()"},
 353                             vg_prof_render = {.name="render()"};
 354
 355 VG_STATIC void vg_checkgl( const char *src_info )
 356 {
 357    int fail = 0;
 358
 359    GLenum err;
 360    while( (err = glGetError()) != GL_NO_ERROR )
 361    {
 362       vg_error( "(%s) OpenGL Error: #%d\n", src_info, err );
 363       fail = 1;
 364    }
 365
 366    if( fail )
 367       vg_fatal_exit_loop( "OpenGL Error" );
 368 }
 369
 370 VG_STATIC void vg_bake_shaders(void)
 371 {
 372    vg_acquire_thread_sync();
 373
 374    vg_function_push( (struct vg_cmd)
 375    {
 376       .name = "reload_shaders",
 377       .function = vg_shaders_live_recompile
 378    });
 379
 380    vg_shaders_compile();
 381    vg_release_thread_sync();
 382 }
 383
 384 VG_STATIC void _vg_load_full(void)
 385 {
 386    vg_preload();
 387
 388    /* internal */
 389    vg_loader_step( vg_input_init, vg_input_free );
 390    vg_loader_step( vg_lines_init, NULL );
 391    vg_loader_step( vg_audio_init, vg_audio_free );
 392    vg_loader_step( vg_profiler_init, NULL );
 393
 394    /* client */
 395    vg_load();
 396 }
 397
 398 VG_STATIC void _vg_process_events(void)
 399 {
 400    /* Update timers */
 401    vg.time_real_last = vg.time_real;
 402    vg.time_real = (double)SDL_GetTicks64() / 1000.0;
 403    vg.frame_delta = vg.time_real-vg.time_real_last;
 404
 405    v2_zero( vg.mouse_wheel );
 406    v2_zero( vg.mouse_delta );
 407
 408    /* SDL event loop */
 409    SDL_Event event;
 410    while( SDL_PollEvent( &event ) )
 411    {
 412       if( event.type == SDL_KEYDOWN )
 413       {
 414          console_proc_key( event.key.keysym );
 415       }
 416       else if( event.type == SDL_MOUSEWHEEL )
 417       {
 418          vg.mouse_wheel[0] += event.wheel.preciseX;
 419          vg.mouse_wheel[1] += event.wheel.preciseY;
 420       }
 421       else if( event.type == SDL_CONTROLLERAXISMOTION ||
 422                event.type == SDL_CONTROLLERBUTTONDOWN ||
 423                event.type == SDL_CONTROLLERBUTTONUP ||
 424                event.type == SDL_CONTROLLERDEVICEADDED ||
 425                event.type == SDL_CONTROLLERDEVICEREMOVED
 426                )
 427       {
 428          vg_input_controller_event( &event );
 429       }
 430       else if( event.type == SDL_MOUSEMOTION )
 431       {
 432          vg.mouse_delta[0] += event.motion.xrel;
 433          vg.mouse_delta[1] += event.motion.yrel;
 434       }
 435       else if( event.type == SDL_WINDOWEVENT )
 436       {
 437          if( event.window.event == SDL_WINDOWEVENT_SIZE_CHANGED )
 438          {
 439             int w, h;
 440             SDL_GL_GetDrawableSize( vg.window, &w, &h );
 441
 442             if( !w || !h )
 443             {
 444                vg_warn( "Got a invalid framebuffer size: "
 445                         "%dx%d... ignoring\n", w, h );
 446             }
 447             else
 448             {
 449                vg.window_x = w;
 450                vg.window_y = h;
 451
 452                vg_framebuffer_resize(w,h);
 453             }
 454          }
 455          else if( event.window.event == SDL_WINDOWEVENT_CLOSE )
 456          {
 457             vg.window_should_close = 1;
 458          }
 459       }
 460       else if( event.type == SDL_TEXTINPUT )
 461       {
 462          console_proc_utf8( event.text.text );
 463       }
 464    }
 465
 466    vg.mouse_pos[0] += vg.mouse_delta[0];
 467    vg.mouse_pos[1] += vg.mouse_delta[1];
 468
 469    /* Update input */
 470    vg_update_inputs();
 471 }
 472
 473 VG_STATIC void _vg_gameloop_update(void)
 474 {
 475    vg_profile_begin( &vg_prof_update );
 476
 477    vg.engine_stage = k_engine_stage_update;
 478    vg_update();
 479
 480    /* Fixed update loop */
 481    vg.engine_stage = k_engine_stage_update_fixed;
 482    vg.accumulator += vg.time_delta;
 483
 484    vg.fixed_iterations = 0;
 485    vg_lines.allow_input = 1;
 486    while( vg.accumulator >= (VG_TIMESTEP_FIXED-0.00125) )
 487    {
 488       vg_update_fixed();
 489       vg_lines.allow_input = 0;
 490
 491       vg.accumulator -= VG_TIMESTEP_FIXED;
 492       vg.accumulator  = VG_MAX( 0.0, vg.accumulator );
 493
 494       vg.fixed_iterations ++;
 495       if( vg.fixed_iterations == 8 )
 496       {
 497          break;
 498       }
 499    }
 500    vg_lines.allow_input = 1;
 501
 502    vg.engine_stage = k_engine_stage_update;
 503    vg_update_post();
 504    vg_profile_end( &vg_prof_update );
 505 }
 506
 507 VG_STATIC void _vg_gameloop_render(void)
 508 {
 509    vg_profile_begin( &vg_prof_render );
 510
 511    if( vg.is_loaded )
 512    {
 513       /* render */
 514       vg.engine_stage = k_engine_stage_rendering;
 515       vg_render();
 516
 517       /* ui */
 518       vg.engine_stage = k_engine_stage_ui;
 519       {
 520          ui_begin( vg.window_x, vg.window_y );
 521
 522          /* TODO */
 523          ui_set_mouse( vg.mouse_pos[0], vg.mouse_pos[1], 0 );
 524
 525          vg_profile_drawn(
 526                (struct vg_profile *[]){&vg_prof_update,&vg_prof_render}, 2,
 527                (1.0f/(float)vg.refresh_rate)*1000.0f,
 528                (ui_rect){ 4, 4, 250, 0 }, 0
 529          );
 530
 531          if( vg_profiler )
 532          {
 533
 534             char perf[128];
 535
 536             snprintf( perf, 127,
 537                   "x: %d y: %d\n"
 538                   "refresh: %.1f (%.1fms)\n"
 539                   "samples: %d\n"
 540                   "iterations: %d (acc: %.3fms%%)\n",
 541                   vg.window_x, vg.window_y,
 542                   vg.refresh_rate, (1.0f/vg.refresh_rate)*1000.0f,
 543                   vg.samples,
 544                   vg.fixed_iterations,
 545                   (vg.accumulator/VG_TIMESTEP_FIXED)*100.0f );
 546
 547             ui_text( (ui_rect){258, 4+24+12,0,0},perf, 1,0);
 548          }
 549
 550          /* FIXME */
 551          audio_debug_ui( vg.pv );
 552          vg_ui();
 553          _vg_console_draw();
 554
 555          ui_resolve();
 556          ui_draw( NULL );
 557       }
 558    }
 559
 560    vg_profile_end( &vg_prof_render );
 561 }
 562
 563 VG_STATIC void _vg_gameloop(void)
 564 {
 565    vg.accumulator = 0.75f * (1.0f/60.0f);
 566
 567    int post_start = 0;
 568    while(1)
 569    {
 570       _vg_process_events();
 571
 572       if( vg.window_should_close )
 573          break;
 574
 575       /* scaled time */
 576       vg.time_delta = vg.frame_delta * vg.time_rate;
 577       vg.time += vg.time_delta;
 578
 579       if( vg.is_loaded )
 580       {
 581          if( !post_start )
 582          {
 583             vg_start();
 584             post_start = 1;
 585          }
 586       }
 587       else
 588       {
 589          _vg_loader_render();
 590       }
 591
 592       _vg_gameloop_update();
 593       _vg_gameloop_render();
 594
 595       SDL_GL_SwapWindow( vg.window );
 596       _vg_run_synced();
 597    }
 598 }
 599
 600 VG_STATIC void _vg_process_launch_opts_internal( int argc, char *argv[] )
 601 {
 602    char *arg;
 603    while( vg_argp( argc, argv ) )
 604    {
 605       if( (arg = vg_opt_arg( 'w' )) )
 606       {
 607          vg.window_x = atoi( arg );
 608       }
 609
 610       if( (arg = vg_opt_arg( 'h' )) )
 611       {
 612          vg.window_y = atoi( arg );
 613       }
 614
 615       if( (arg = vg_long_opt_arg( "samples" )) )
 616       {
 617          vg.samples = VG_MAX( 0, VG_MIN( 8, atoi( arg ) ) );
 618       }
 619
 620       if(  vg_long_opt( "use-libc-malloc" ) )
 621       {
 622          vg_mem.use_libc_malloc = 1;
 623       }
 624
 625       if( vg_long_opt( "high-performance" ) )
 626       {
 627          vg.quality_profile = k_quality_profile_low;
 628       }
 629
 630       vg_launch_opt();
 631    }
 632 }
 633
 634 VG_STATIC void _vg_init_window( const char *window_name )
 635 {
 636    vg_info( "SDL_INIT\n" );
 637
 638    if( SDL_Init( SDL_INIT_VIDEO ) != 0  )
 639    {
 640       vg_error( "SDL_Init failed: %s\n", SDL_GetError() );
 641       exit(0);
 642    }
 643
 644    SDL_InitSubSystem( SDL_INIT_AUDIO );
 645    SDL_InitSubSystem( SDL_INIT_GAMECONTROLLER );
 646
 647    SDL_GL_SetAttribute( SDL_GL_DOUBLEBUFFER, 1 );
 648    SDL_GL_SetAttribute( SDL_GL_CONTEXT_MAJOR_VERSION, 3 );
 649    SDL_GL_SetAttribute( SDL_GL_CONTEXT_MINOR_VERSION, 3 );
 650    SDL_GL_SetAttribute( SDL_GL_CONTEXT_PROFILE_MASK,
 651                            SDL_GL_CONTEXT_PROFILE_CORE );
 652
 653    SDL_GL_SetAttribute( SDL_GL_CONTEXT_RELEASE_BEHAVIOR,
 654                            SDL_GL_CONTEXT_RELEASE_BEHAVIOR_FLUSH );
 655
 656    SDL_GL_SetAttribute( SDL_GL_RED_SIZE, 8 );
 657    SDL_GL_SetAttribute( SDL_GL_GREEN_SIZE, 8 );
 658    SDL_GL_SetAttribute( SDL_GL_BLUE_SIZE, 8 );
 659    SDL_GL_SetAttribute( SDL_GL_ALPHA_SIZE, 8 );
 660    SDL_GL_SetAttribute( SDL_GL_STENCIL_SIZE, 0 );
 661
 662    /*
 663     * Get monitor information
 664     */
 665    vg_info( "Getting display count\n" );
 666    int display_count = 0, display_index = 0, mode_index = 0;
 667    if( (display_count = SDL_GetNumVideoDisplays()) < 1 )
 668    {
 669       vg_error( "SDL_GetNumVideoDisplays returned: %i\n", display_count );
 670       exit(0);
 671    }
 672
 673
 674
 675
 676    /* TODO: Allow chosing the modes at startup */
 677    vg_info( "Getting default display mode\n" );
 678    SDL_DisplayMode vm_ideal = { 0, 0, 0, 0, 0 };
 679    if( SDL_GetDisplayMode( display_index, mode_index, &vm_ideal ) != 0 )
 680    {
 681       vg_error( "SDL_GetDisplayMode failed: %s", SDL_GetError() );
 682       exit(0);
 683    }
 684
 685    if( vg.window_x )
 686       vm_ideal.w = vg.window_x;
 687
 688    if( vg.window_y )
 689       vm_ideal.h = vg.window_y;
 690
 691
 692    SDL_DisplayMode vm_best;
 693    if( !SDL_GetClosestDisplayMode( display_index, &vm_ideal, &vm_best ) )
 694    {
 695       vg_error( "SDL_GetClosestDisplayMode failed: %s", SDL_GetError() );
 696       exit(0);
 697    }
 698
 699    vg.refresh_rate = vm_best.refresh_rate;
 700    vg.window_x = vm_best.w;
 701    vg.window_y = vm_best.h;
 702
 703    vg_info( "CreateWindow( %d %d @%.2fhz )\n", vg.window_x, vg.window_y,
 704                                                vg.refresh_rate );
 705
 706    /* TODO: Allow selecting closest video mode from launch opts */
 707    if((vg.window = SDL_CreateWindow( window_name,
 708                                      SDL_WINDOWPOS_UNDEFINED,
 709                                      SDL_WINDOWPOS_UNDEFINED,
 710                                      vg.window_x, vg.window_y,
 711
 712                                      SDL_WINDOW_FULLSCREEN_DESKTOP |
 713                                      SDL_WINDOW_OPENGL |
 714                                      SDL_WINDOW_INPUT_GRABBED )))
 715    {
 716       if( SDL_SetWindowDisplayMode( vg.window, &vm_best ) )
 717       {
 718          vg_error( "SDL_SetWindowDisplayMode failed: %s", SDL_GetError() );
 719          SDL_Quit();
 720          exit(0);
 721       }
 722    }
 723    else
 724    {
 725       vg_error( "SDL_CreateWindow failed: %s", SDL_GetError() );
 726       exit(0);
 727    }
 728
 729    vg_info( "CreateContext\n" );
 730
 731    /*
 732     * OpenGL loading
 733     */
 734    if( (vg.gl_context = SDL_GL_CreateContext(vg.window) ))
 735    {
 736       SDL_GL_GetDrawableSize( vg.window, &vg.window_x, &vg.window_y );
 737       vg_success( "Window created (%dx%d)\n", vg.window_x, vg.window_y );
 738    }
 739    else
 740    {
 741       vg_error( "SDL_GL_CreateContext failed: %s\n", SDL_GetError() );
 742       SDL_Quit();
 743       exit(0);
 744    }
 745
 746    if( !gladLoadGLLoader((GLADloadproc)SDL_GL_GetProcAddress) )
 747    {
 748       vg_error( "Glad Failed to initialize\n" );
 749       SDL_GL_DeleteContext( vg.gl_context );
 750       SDL_Quit();
 751       exit(0);
 752    }
 753
 754    const unsigned char* glver = glGetString( GL_VERSION );
 755    vg_success( "Load setup complete, OpenGL version: %s\n", glver );
 756
 757    vg_info( "Setting swap interval\n" );
 758
 759    if( SDL_GL_SetSwapInterval( -1 ) == -1 )
 760    {
 761       vg_warn( "Adaptive Vsync not supported\n" );
 762
 763       if( SDL_GL_SetSwapInterval( 1 ) == -1 )
 764       {
 765          vg_fatal_exit_loop( "Cannot enable Vsync! You might be overriding it"
 766                              " in your graphics control panel.\n" );
 767       }
 768       else
 769          vg_success( "Using vsync\n" );
 770    }
 771    else
 772       vg_success( "Using adaptive Vsync\n" );
 773
 774    SDL_DisplayMode dispmode;
 775    if( !SDL_GetWindowDisplayMode( vg.window, &dispmode ) )
 776    {
 777       if( dispmode.refresh_rate )
 778       {
 779          vg.refresh_rate = dispmode.refresh_rate;
 780          vg_info( "Refresh rate: %d\n", dispmode.refresh_rate );
 781       }
 782    }
 783 }
 784
 785 VG_STATIC void vg_enter( int argc, char *argv[], const char *window_name )
 786 {
 787    _vg_process_launch_opts_internal( argc, argv );
 788
 789    /* Systems init */
 790    vg_alloc_quota();
 791    _vg_log_init();
 792    _vg_console_init();
 793    _vg_init_window( window_name );
 794
 795    SDL_SetRelativeMouseMode(1);
 796    vg.thread_id_main = SDL_GetThreadID(NULL);
 797
 798    /* Opengl-required systems */
 799    _vg_ui_init();
 800    _vg_loader_init();
 801
 802    vg.engine_status = k_engine_status_running;
 803
 804    _vg_opengl_sync_init();
 805     vg_loader_start( _vg_load_full );
 806    _vg_gameloop();
 807
 808    /* Shutdown */
 809    _vg_console_write_persistent();
 810
 811    SDL_AtomicLock( &vg.sl_context );
 812    vg.engine_status = k_engine_status_none;
 813    SDL_AtomicUnlock( &vg.sl_context );
 814
 815    _vg_loader_free();
 816
 817    vg_success( "If you see this it means everything went.. \"well\".....\n" );
 818
 819    SDL_GL_DeleteContext( vg.gl_context );
 820    SDL_Quit();
 821 }
 822
 823 /*
 824  * Immediately transfer away from calling thread into a safe loop, signal for
 825  * others to shutdown, then free everything once the user closes the window.
 826  *
 827  * FIXME(bug): glfwWindowShouldClose() never returns 1 in windows via wine, ONLY
 828  *             when calling the program from outside its normal directory.
 829  */
 830 VG_STATIC void vg_fatal_exit_loop( const char *error )
 831 {
 832    /*
 833     *    https://www.gnu.org/software/libc/manual/html_node/Backtraces.html
 834     *    thanks gnu <3
 835     *
 836     *    TODO: this on windows?
 837     */
 838
 839 #ifndef _WIN32
 840
 841    void *array[20];
 842    char **strings;
 843    int size, i;
 844
 845    size = backtrace( array, 20 );
 846    strings = backtrace_symbols( array, size );
 847
 848    if( strings != NULL )
 849    {
 850       vg_error( "---------------- gnu backtrace -------------\n" );
 851
 852       for( int i=0; i<size; i++ )
 853          vg_info( "%s\n", strings[i] );
 854
 855       vg_error( "---------------- gnu backtrace -------------\n" );
 856    }
 857
 858    free( strings );
 859
 860 #endif
 861
 862    vg_error( "Fatal error: %s\n", error );
 863
 864    SDL_AtomicLock( &vg.sl_context );
 865    if( vg.engine_status == k_engine_status_none )
 866    {
 867       SDL_AtomicUnlock( &vg.sl_context );
 868
 869       /* TODO: Correct shutdown before other systems */
 870       exit(0);
 871    }
 872    else
 873    {
 874       SDL_AtomicUnlock( &vg.sl_context );
 875
 876       vg_acquire_thread_sync();
 877
 878       SDL_AtomicLock( &vg.sl_context );
 879       vg.engine_status = k_engine_status_crashed;
 880       vg.str_const_engine_err = error;
 881       SDL_AtomicUnlock( &vg.sl_context );
 882
 883       /* Notify other thread for curtosey */
 884       if( vg_thread_purpose() == k_thread_purpose_main )
 885       {
 886          SDL_AtomicLock( &vg.sl_context );
 887
 888          if( vg.exec_context != 0 )
 889             SDL_SemPost( vg.sem_allow_exec );
 890
 891          SDL_AtomicUnlock( &vg.sl_context );
 892       }
 893
 894       vg_audio_free();
 895
 896       while(1)
 897       {
 898          _vg_process_events();
 899          if( vg.window_should_close )
 900             break;
 901
 902          if( vg_getkey( SDLK_ESCAPE ) )
 903             break;
 904
 905          glBindFramebuffer( GL_FRAMEBUFFER, 0 );
 906          glEnable(GL_BLEND);
 907          glDisable(GL_DEPTH_TEST);
 908          glBlendFunc(GL_ONE_MINUS_DST_ALPHA, GL_DST_ALPHA);
 909          glBlendEquation(GL_FUNC_ADD);
 910
 911          glClearColor( 0.15f + sinf(vg.time_real)*0.1f, 0.0f, 0.0f,1.0f );
 912          glClear( GL_COLOR_BUFFER_BIT );
 913          glViewport( 0,0, vg.window_x, vg.window_y );
 914
 915          _vg_render_log();
 916          SDL_GL_SwapWindow( vg.window );
 917       }
 918
 919       /* Can now shutdown and EXIT */
 920       _vg_loader_free();
 921       SDL_GL_DeleteContext( vg.gl_context );
 922       SDL_Quit();
 923       exit(0);
 924    }
 925 }
 926
 927 #else /* VG_GAME */
 928
 929 VG_STATIC void vg_fatal_exit_loop( const char *error )
 930 {
 931    vg_error( "Fatal error: %s\n", error );
 932    exit(0);
 933 }
 934
 935 #endif /* VG_GAME */
 936
 937 /*
 938  * Graphic cards will check these to force it to use the GPU
 939  */
 940 u32 NvOptimusEnablement = 0x00000001;
 941 int AmdPowerXpressRequestHighPerformance = 1;
 942
 943 #endif /* VG_HEADER_H */