vg.h

   1 /* Copyright (C) 2021-2023 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 #ifndef VG_HEADER_H
  53   #define VG_HEADER_H
  54
  55   #include "vg_platform.h"
  56   #include "vg_mem.h"
  57
  58   #ifndef _WIN32
  59     #include <execinfo.h>
  60   #endif
  61
  62 VG_STATIC void vg_print_backtrace(void)
  63 {
  64 #ifndef _WIN32
  65
  66    void *array[20];
  67    char **strings;
  68    int size, i;
  69
  70    size = backtrace( array, 20 );
  71    strings = backtrace_symbols( array, size );
  72
  73    if( strings != NULL ){
  74       vg_error( "---------------- gnu backtrace -------------\n" );
  75
  76       for( int i=0; i<size; i++ )
  77          vg_info( "%s\n", strings[i] );
  78
  79       vg_error( "---------------- gnu backtrace -------------\n" );
  80    }
  81
  82    free( strings );
  83
  84 #endif
  85 }
  86
  87   #ifdef VG_GAME
  88     #include "dep/glad/glad.h"
  89     #include "submodules/SDL/include/SDL.h"
  90     #include "vg_stdint.h"
  91
  92     void vg_register_exit( void( *funcptr )(void), const char *name );
  93
  94     #include "vg_m.h"
  95     #include "vg_io.h"
  96     #include "vg_log.h"
  97     #include "vg_steam.h"
  98     #include <setjmp.h>
  99
 100   //#define VG_SYNC_DEBUG
 101   #ifdef VG_SYNC_DEBUG
 102     #define VG_SYNC_LOG(STR,...) \
 103        vg_info(STR,SDL_GetThreadID(NULL),##__VA_ARGS__)
 104   #else
 105     #define VG_SYNC_LOG(...)
 106   #endif
 107
 108 /* API */
 109 VG_STATIC void vg_enter( int argc, char *argv[], const char *window_name );
 110
 111 /* Thread 1 */
 112 VG_STATIC void vg_preload(void);
 113 VG_STATIC void vg_load(void);
 114
 115 /* Main thread */
 116 VG_STATIC void vg_launch_opt(void);
 117 VG_STATIC void vg_start(void);
 118
 119 VG_STATIC void vg_framebuffer_resize(int w, int h);
 120 VG_STATIC void vg_update(void);
 121 VG_STATIC void vg_update_fixed(void);
 122 VG_STATIC void vg_update_post(void);
 123
 124 VG_STATIC void vg_render(void);
 125 VG_STATIC void vg_gui(void);
 126
 127 struct vg{
 128    /* Engine sync */
 129    SDL_Window     *window;
 130    SDL_GLContext  gl_context;
 131    const char     *base_path;
 132
 133    SDL_sem *sem_loader;        /* allows only one loader at a time */
 134    jmp_buf env_loader_exit;
 135
 136    SDL_threadID  thread_id_main,
 137                  thread_id_loader;
 138    void         *thread_data;
 139
 140    SDL_SpinLock sl_status;
 141    enum engine_status{
 142       k_engine_status_none,
 143       k_engine_status_load_internal,
 144       k_engine_status_running,
 145       k_engine_status_crashed
 146    }
 147    engine_status;
 148
 149    /* Window information */
 150    int window_x,
 151        window_y,
 152        samples,
 153        window_should_close;
 154
 155    int display_refresh_rate,
 156        fps_limit;             /* 0: use vsync, >0: cap fps to this, no vsync */
 157
 158    enum vsync_feature{
 159       k_vsync_feature_disabled=0,
 160       k_vsync_feature_enabled=1,
 161       k_vsync_feature_enabled_adaptive=2,
 162       k_vsync_feature_error=3
 163    }
 164    vsync_feature;
 165
 166    double mouse_pos[2];
 167    v2f mouse_delta,
 168        mouse_wheel;
 169
 170    /* Runtime */
 171    double time,
 172           time_delta,
 173           time_rate,
 174
 175           time_fixed_accumulator,
 176           time_fixed_extrapolate,
 177           time_frame_delta;
 178
 179    u64 time_hp, time_hp_last, time_spinning;
 180
 181    int fixed_iterations;
 182
 183    enum engine_stage{
 184       k_engine_stage_none,
 185       k_engine_stage_update,
 186       k_engine_stage_update_fixed,
 187       k_engine_stage_rendering,
 188       k_engine_stage_ui
 189    }
 190    engine_stage;
 191
 192    /* graphics */
 193    m4x4f pv;
 194    enum quality_profile{
 195       k_quality_profile_high = 0,
 196       k_quality_profile_low = 1,
 197    }
 198    quality_profile;
 199
 200    float loader_ring;
 201 }
 202 VG_STATIC vg = { .time_rate = 1.0 };
 203
 204 enum vg_thread_purpose
 205 {
 206    k_thread_purpose_nothing,
 207    k_thread_purpose_main,
 208    k_thread_purpose_loader
 209 };
 210
 211 #include "vg_async.h"
 212
 213 VG_STATIC enum engine_status _vg_engine_status(void)
 214 {
 215    SDL_AtomicLock( &vg.sl_status );
 216    enum engine_status status = vg.engine_status;
 217    SDL_AtomicUnlock( &vg.sl_status );
 218
 219    return status;
 220 }
 221
 222 VG_STATIC enum vg_thread_purpose vg_thread_purpose(void)
 223 {
 224    SDL_AtomicLock( &vg.sl_status );
 225
 226    if( vg.thread_id_main == SDL_GetThreadID(NULL) ){
 227       SDL_AtomicUnlock( &vg.sl_status );
 228       return k_thread_purpose_main;
 229    }
 230    else{
 231       SDL_AtomicUnlock( &vg.sl_status );
 232       return k_thread_purpose_loader;
 233    }
 234 }
 235
 236 VG_STATIC void _vg_opengl_sync_init(void)
 237 {
 238    vg.sem_loader = SDL_CreateSemaphore(1);
 239 }
 240
 241 VG_STATIC void vg_checkgl( const char *src_info );
 242 #define VG_STRINGIT( X ) #X
 243 #define VG_CHECK_GL_ERR() vg_checkgl( __FILE__ ":L" VG_STRINGIT(__LINE__) )
 244
 245 #include "vg_console.h"
 246 #include "vg_profiler.h"
 247 #include "vg_audio.h"
 248 #include "vg_shader.h"
 249 #include "vg_tex.h"
 250 #include "vg_input.h"
 251 #include "vg_ui.h"
 252 #include "vg_imgui.h"
 253 #include "vg_lines.h"
 254 #include "vg_loader.h"
 255 #include "vg_opt.h"
 256
 257 /* Diagnostic */
 258 VG_STATIC struct vg_profile vg_prof_update = {.name="update()"},
 259                             vg_prof_render = {.name="render()"},
 260                             vg_prof_swap   = {.name="swap"};
 261
 262 VG_STATIC void vg_checkgl( const char *src_info )
 263 {
 264    int fail = 0;
 265
 266    GLenum err;
 267    while( (err = glGetError()) != GL_NO_ERROR ){
 268       vg_error( "(%s) OpenGL Error: #%d\n", src_info, err );
 269       fail = 1;
 270    }
 271
 272    if( fail )
 273       vg_fatal_error( "OpenGL Error" );
 274 }
 275
 276 VG_STATIC void async_vg_bake_shaders( void *payload, u32 size )
 277 {
 278    vg_shaders_compile();
 279 }
 280
 281 VG_STATIC void vg_bake_shaders(void)
 282 {
 283    vg_console_reg_cmd( "reload_shaders", vg_shaders_live_recompile, NULL );
 284    vg_async_call( async_vg_bake_shaders, NULL, 0 );
 285 }
 286
 287 void async_internal_complete( void *payload, u32 size )
 288 {
 289    vg_success( "Internal async setup complete\n" );
 290    SDL_AtomicLock( &vg.sl_status );
 291
 292    if( vg.engine_status == k_engine_status_crashed ){
 293       SDL_AtomicUnlock( &vg.sl_status );
 294       return;
 295    }
 296    else{
 297       vg.engine_status = k_engine_status_running;
 298    }
 299
 300    SDL_AtomicUnlock( &vg.sl_status );
 301 }
 302
 303 VG_STATIC void _vg_load_full( void *data )
 304 {
 305    vg_preload();
 306
 307    /* internal */
 308    vg_loader_step( vg_input_init, vg_input_free );
 309    vg_loader_step( vg_lines_init, NULL );
 310    vg_loader_step( vg_audio_init, vg_audio_free );
 311    vg_loader_step( vg_profiler_init, NULL );
 312
 313    vg_async_call( async_internal_complete, NULL, 0 );
 314
 315    /* client */
 316    vg_load();
 317 }
 318
 319 VG_STATIC void _vg_process_events(void)
 320 {
 321    v2_zero( vg.mouse_wheel );
 322    v2_zero( vg.mouse_delta );
 323
 324    /* Update input */
 325    vg_process_inputs();
 326
 327    /* SDL event loop */
 328    SDL_Event event;
 329    while( SDL_PollEvent( &event ) ){
 330       if( event.type == SDL_KEYDOWN ){
 331          if( vg_console.enabled ){
 332             if( event.key.keysym.sym == SDLK_ESCAPE ||
 333                 event.key.keysym.sym == SDLK_BACKQUOTE ){
 334                vg_console.enabled = 0;
 335                ui_defocus_all();
 336             }
 337             else if( (event.key.keysym.mod & KMOD_CTRL) &&
 338                       event.key.keysym.sym == SDLK_n ){
 339                _console_suggest_next();
 340             }
 341             else if( (event.key.keysym.mod & KMOD_CTRL ) &&
 342                       event.key.keysym.sym == SDLK_p ){
 343                _console_suggest_prev();
 344             }
 345             else{
 346                _ui_proc_key( event.key.keysym );
 347             }
 348          }
 349          else{
 350             if( event.key.keysym.sym == SDLK_BACKQUOTE ){
 351                vg_console.enabled = 1;
 352             }
 353             else {
 354                _ui_proc_key( event.key.keysym );
 355             }
 356          }
 357       }
 358       else if( event.type == SDL_MOUSEWHEEL ){
 359          vg.mouse_wheel[0] += event.wheel.preciseX;
 360          vg.mouse_wheel[1] += event.wheel.preciseY;
 361       }
 362       else if( event.type == SDL_CONTROLLERDEVICEADDED ||
 363                event.type == SDL_CONTROLLERDEVICEREMOVED )
 364       {
 365          vg_input_device_event( &event );
 366       }
 367       else if( event.type == SDL_CONTROLLERAXISMOTION ||
 368                event.type == SDL_CONTROLLERBUTTONDOWN ||
 369                event.type == SDL_CONTROLLERBUTTONUP )
 370       {
 371          vg_input_controller_event( &event );
 372       }
 373       else if( event.type == SDL_MOUSEMOTION ){
 374          vg.mouse_delta[0] += event.motion.xrel;
 375          vg.mouse_delta[1] += event.motion.yrel;
 376       }
 377       else if( event.type == SDL_WINDOWEVENT ){
 378          if( event.window.event == SDL_WINDOWEVENT_SIZE_CHANGED ){
 379             int w, h;
 380             SDL_GL_GetDrawableSize( vg.window, &w, &h );
 381
 382             if( !w || !h ){
 383                vg_warn( "Got a invalid framebuffer size: "
 384                         "%dx%d... ignoring\n", w, h );
 385             }
 386             else{
 387                vg.window_x = w;
 388                vg.window_y = h;
 389
 390                vg_framebuffer_resize(w,h);
 391             }
 392          }
 393          else if( event.window.event == SDL_WINDOWEVENT_CLOSE ){
 394             vg.window_should_close = 1;
 395          }
 396       }
 397       else if( event.type == SDL_TEXTINPUT ){
 398          ui_proc_utf8( event.text.text );
 399       }
 400    }
 401
 402    vg.mouse_pos[0] += vg.mouse_delta[0];
 403    vg.mouse_pos[1] += vg.mouse_delta[1];
 404 }
 405
 406 VG_STATIC void _vg_gameloop_update(void)
 407 {
 408    vg_profile_begin( &vg_prof_update );
 409
 410    vg.engine_stage = k_engine_stage_update;
 411    vg_update();
 412
 413    /* Fixed update loop */
 414    vg.engine_stage = k_engine_stage_update_fixed;
 415
 416    vg.fixed_iterations = 0;
 417    vg_lines.allow_input = 1;
 418    vg.time_fixed_accumulator += vg.time_delta;
 419
 420    while( vg.time_fixed_accumulator >= VG_TIMESTEP_FIXED ){
 421       vg_update_fixed();
 422       vg_lines.allow_input = 0;
 423
 424       vg.time_fixed_accumulator -= VG_TIMESTEP_FIXED;
 425       //vg.accumulator  = VG_MAX( 0.0, vg.accumulator );
 426
 427       vg.fixed_iterations ++;
 428       if( vg.fixed_iterations == 8 ){
 429          break;
 430       }
 431    }
 432    vg_lines.allow_input = 1;
 433    vg.time_fixed_extrapolate = vg.time_fixed_accumulator / VG_TIMESTEP_FIXED;
 434
 435    vg.engine_stage = k_engine_stage_update;
 436    vg_update_post();
 437    vg_profile_end( &vg_prof_update );
 438 }
 439
 440 VG_STATIC void _vg_gameloop_render(void)
 441 {
 442    vg_profile_begin( &vg_prof_render );
 443
 444    /* render */
 445    vg.engine_stage = k_engine_stage_rendering;
 446    vg_render();
 447
 448    /* ui */
 449    vg.engine_stage = k_engine_stage_ui;
 450    {
 451       ui_prerender();
 452       if( vg_console.enabled ){
 453          vg_ui.ignore_input_frames = 10;
 454          vg_gui();
 455          vg_ui.ignore_input_frames = 0;
 456          vg_ui.wants_mouse = 1;
 457          _vg_console_draw();
 458       }
 459       else vg_gui();
 460
 461       ui_postrender();
 462 #if 0
 463       ui_begin( vg.window_x, vg.window_y );
 464
 465       /* TODO */
 466       ui_set_mouse( vg.mouse_pos[0], vg.mouse_pos[1], 0 );
 467
 468       int frame_target = vg.display_refresh_rate;
 469
 470       if( vg.fps_limit > 0 ){
 471          frame_target = vg.fps_limit;
 472       }
 473
 474       vg_profile_drawn(
 475             (struct vg_profile *[]){
 476                &vg_prof_update,&vg_prof_render,&vg_prof_swap}, 3,
 477             (1.0f/(float)frame_target)*1000.0f,
 478             (ui_rect){ 4, 4, 250, 0 }, 0
 479       );
 480
 481       if( vg_profiler ){
 482          char perf[256];
 483
 484          snprintf( perf, 255,
 485                "x: %d y: %d\n"
 486                "refresh: %d (%.1fms)\n"
 487                "samples: %d\n"
 488                "iterations: %d (acc: %.3fms%%)\n"
 489                "time: real(%.2f) delta(%.2f) rate(%.2f)\n"
 490 #ifdef _WIN32
 491                "      extrap(%.2f) frame(%.2f) spin( %llu )\n",
 492 #else
 493                "      extrap(%.2f) frame(%.2f) spin( %lu )\n",
 494 #endif
 495                vg.window_x, vg.window_y,
 496                frame_target, (1.0f/(float)frame_target)*1000.0f,
 497                vg.samples,
 498                vg.fixed_iterations,
 499                (vg.time_fixed_accumulator/VG_TIMESTEP_FIXED)*100.0f,
 500                vg.time, vg.time_delta, vg.time_rate,
 501                vg.time_fixed_extrapolate, vg.time_frame_delta,
 502                vg.time_spinning );
 503
 504          ui_text( (ui_rect){258, 4+24+12+12,0,0},perf, 1,0);
 505       }
 506
 507       /* FIXME */
 508       audio_debug_ui( vg.pv );
 509       vg_gui();
 510
 511       ui_resolve();
 512       ui_draw( NULL );
 513 #endif
 514    }
 515
 516    vg_profile_end( &vg_prof_render );
 517 }
 518
 519 VG_STATIC int vg_framefilter( double dt )
 520 {
 521    if( (vg.fps_limit <= 0) && (vg.vsync_feature != k_vsync_feature_error) ){
 522       /* turn on vsync if not enabled */
 523
 524       enum vsync_feature requested = k_vsync_feature_enabled;
 525       if( vg.fps_limit < 0 ) requested = k_vsync_feature_enabled_adaptive;
 526
 527       if( vg.vsync_feature != requested ){
 528          vg_info( "Setting swap interval\n" );
 529
 530          int swap_interval = 1;
 531          if( requested == k_vsync_feature_enabled_adaptive ) swap_interval = -1;
 532
 533          if( SDL_GL_SetSwapInterval( swap_interval ) == -1 ){
 534             if( requested == k_vsync_feature_enabled ){
 535                vg_error( "Vsync is not supported by your system\n" );
 536                vg_warn( "You may be overriding it in your"
 537                         " graphics control panel.\n" );
 538             }
 539             else{
 540                vg_error( "Adaptive Vsync is not supported by your system\n" );
 541             }
 542
 543             vg.vsync_feature = k_vsync_feature_error;
 544             vg.fps_limit = vg.display_refresh_rate;
 545
 546             /* TODO: Make popup to notify user that this happened */
 547             return 1;
 548          }
 549          else{
 550             vg_success( "Vsync enabled (%d)\n", requested );
 551             vg.vsync_feature = requested;
 552          }
 553       }
 554
 555       return 0;
 556    }
 557
 558    if( vg.vsync_feature != k_vsync_feature_disabled ){
 559       SDL_GL_SetSwapInterval( 0 );
 560       vg.vsync_feature = k_vsync_feature_disabled;
 561    }
 562
 563    if( vg.fps_limit < 25 ) vg.fps_limit = 25;
 564    if( vg.fps_limit > 300 ) vg.fps_limit = 300;
 565
 566    double min_frametime = 1.0/(double)vg.fps_limit;
 567    if( vg.time_frame_delta < min_frametime ){
 568       /* TODO: we can use high res nanosleep on Linux here */
 569       double sleep_ms = (min_frametime-vg.time_frame_delta) * 1000.0;
 570       u32 ms = (u32)floor( sleep_ms );
 571
 572       if( ms ){
 573          SDL_Delay( ms );
 574       }
 575       else{
 576          vg.time_spinning ++;
 577       }
 578
 579       return 1;
 580    }
 581
 582    return 0;
 583 }
 584
 585 VG_STATIC int _vg_crashscreen(void)
 586 {
 587 #if 0
 588    if( vg_getkey( SDLK_ESCAPE ) )
 589       return 1;
 590 #endif
 591
 592    glBindFramebuffer( GL_FRAMEBUFFER, 0 );
 593    glEnable(GL_BLEND);
 594    glDisable(GL_DEPTH_TEST);
 595    glBlendFunc(GL_ONE_MINUS_DST_ALPHA, GL_DST_ALPHA);
 596    glBlendEquation(GL_FUNC_ADD);
 597
 598    glClearColor( 0.15f + sinf(vg.time)*0.1f, 0.0f, 0.0f,1.0f );
 599    glClear( GL_COLOR_BUFFER_BIT );
 600    glViewport( 0,0, vg.window_x, vg.window_y );
 601
 602    _vg_render_log();
 603
 604    return 0;
 605 }
 606
 607 VG_STATIC void _vg_gameloop(void)
 608 {
 609    //vg.time_fixed_accumulator = 0.75f * (1.0f/60.0f);
 610
 611    vg.time_hp = SDL_GetPerformanceCounter();
 612    vg.time_hp_last = vg.time_hp;
 613
 614    int post_start = 0;
 615    while(1){
 616
 617       vg.time_hp = SDL_GetPerformanceCounter();
 618       u64 udt = vg.time_hp - vg.time_hp_last;
 619       vg.time_hp_last = vg.time_hp;
 620
 621       double dt = (double)udt / (double)SDL_GetPerformanceFrequency();
 622
 623       vg.time_frame_delta += dt;
 624
 625       if( vg_framefilter( dt ) )
 626          continue;
 627
 628       vg_profile_begin( &vg_prof_swap );
 629       SDL_GL_SwapWindow( vg.window );
 630       vg_profile_end( &vg_prof_swap );
 631
 632       enum engine_status status = _vg_engine_status();
 633
 634       vg.time_delta = vg.time_frame_delta * vg.time_rate;
 635       vg.time += vg.time_delta;
 636
 637       vg_run_async_checked();
 638       _vg_process_events();
 639
 640       if( vg.window_should_close )
 641          break;
 642
 643       if( status == k_engine_status_crashed ){
 644          if( _vg_crashscreen() )
 645             break;
 646       }
 647       else{
 648          if( status == k_engine_status_running ){
 649             _vg_gameloop_update();
 650             _vg_gameloop_render();
 651          }
 652          else{
 653             _vg_loader_render();
 654          }
 655       }
 656
 657       if( vg.loader_ring > 0.01f ){
 658          vg.loader_ring -= vg.time_frame_delta * 0.5f;
 659          _vg_loader_render_ring( vg.loader_ring );
 660       }
 661
 662       vg.time_frame_delta = 0.0;
 663       vg.time_spinning = 0;
 664    }
 665 }
 666
 667 VG_STATIC void _vg_process_launch_opts_internal( int argc, char *argv[] )
 668 {
 669    char *arg;
 670    while( vg_argp( argc, argv ) ){
 671       if( (arg = vg_opt_arg( 'w' )) ){
 672          vg.window_x = atoi( arg );
 673       }
 674
 675       if( (arg = vg_opt_arg( 'h' )) ){
 676          vg.window_y = atoi( arg );
 677       }
 678
 679       if( (arg = vg_long_opt_arg( "samples" )) ){
 680          vg.samples = VG_MAX( 0, VG_MIN( 8, atoi( arg ) ) );
 681       }
 682
 683       if(  vg_long_opt( "use-libc-malloc" ) ){
 684          vg_mem.use_libc_malloc = 1;
 685       }
 686
 687       if( vg_long_opt( "high-performance" ) ){
 688          vg.quality_profile = k_quality_profile_low;
 689       }
 690
 691       vg_launch_opt();
 692    }
 693 }
 694
 695 VG_STATIC void _vg_init_window( const char *window_name )
 696 {
 697    vg_info( "SDL_INIT\n" );
 698
 699    if( SDL_Init( SDL_INIT_VIDEO ) != 0  ){
 700       vg_error( "SDL_Init failed: %s\n", SDL_GetError() );
 701       exit(0);
 702    }
 703
 704    SDL_InitSubSystem( SDL_INIT_AUDIO );
 705    SDL_InitSubSystem( SDL_INIT_GAMECONTROLLER );
 706
 707    char *exe_basepath = SDL_GetBasePath();
 708    u32 len = vg_align8( strlen(exe_basepath)+1 );
 709    char *dest  = vg_linear_alloc( vg_mem.rtmemory, len );
 710    strcpy( dest, exe_basepath );
 711    SDL_free( exe_basepath );
 712    vg.base_path = dest;
 713
 714    vg_info( "Basepath: %s\n", vg.base_path );
 715
 716    SDL_GL_SetAttribute( SDL_GL_DOUBLEBUFFER, 1 );
 717    SDL_GL_SetAttribute( SDL_GL_CONTEXT_MAJOR_VERSION, 3 );
 718    SDL_GL_SetAttribute( SDL_GL_CONTEXT_MINOR_VERSION, 3 );
 719    SDL_GL_SetAttribute( SDL_GL_CONTEXT_PROFILE_MASK,
 720                            SDL_GL_CONTEXT_PROFILE_CORE );
 721
 722    SDL_GL_SetAttribute( SDL_GL_CONTEXT_RELEASE_BEHAVIOR,
 723                            SDL_GL_CONTEXT_RELEASE_BEHAVIOR_FLUSH );
 724
 725    SDL_GL_SetAttribute( SDL_GL_RED_SIZE, 8 );
 726    SDL_GL_SetAttribute( SDL_GL_GREEN_SIZE, 8 );
 727    SDL_GL_SetAttribute( SDL_GL_BLUE_SIZE, 8 );
 728    SDL_GL_SetAttribute( SDL_GL_ALPHA_SIZE, 8 );
 729    SDL_GL_SetAttribute( SDL_GL_STENCIL_SIZE, 0 );
 730
 731    /*
 732     * Get monitor information
 733     */
 734    vg_info( "Getting display count\n" );
 735    int display_count = 0,
 736        display_index = 0,
 737        mode_index = 0;
 738
 739 #ifdef VG_DEVWINDOW
 740    vg.window_x = 1600;
 741    vg.window_y = 1000;
 742 #else
 743
 744    SDL_DisplayMode video_mode;
 745    if( SDL_GetDesktopDisplayMode( display_index, &video_mode ) ){
 746       vg_error( "SDL_GetDesktopDisplayMode failed: %s\n", SDL_GetError() );
 747       SDL_Quit();
 748       exit(0);
 749    }
 750
 751    vg.display_refresh_rate = video_mode.refresh_rate;
 752    vg.window_x = video_mode.w;
 753    vg.window_y = video_mode.h;
 754 #endif
 755
 756 #ifndef _WIN32
 757         SDL_SetHint( "SDL_VIDEO_X11_XINERAMA", "1" );
 758         SDL_SetHint( "SDL_VIDEO_X11_XRANDR", "0" );
 759         SDL_SetHint( "SDL_VIDEO_X11_XVIDMODE", "0" );
 760 #endif
 761
 762    vg_info( "CreateWindow( %d %d @%dhz )\n", vg.window_x, vg.window_y,
 763                                              vg.display_refresh_rate );
 764
 765    /* TODO: Allow selecting closest video mode from launch opts */
 766    if((vg.window = SDL_CreateWindow( window_name,
 767
 768 #ifdef VG_DEVWINDOW
 769          0, 0, vg.window_x, vg.window_y,
 770          SDL_WINDOW_BORDERLESS|SDL_WINDOW_OPENGL|SDL_WINDOW_INPUT_GRABBED
 771       ))){}
 772 #else
 773                                      0, 0,
 774                                      vg.window_x, vg.window_y,
 775
 776                                      SDL_WINDOW_FULLSCREEN_DESKTOP |
 777                                      SDL_WINDOW_OPENGL |
 778                                      SDL_WINDOW_INPUT_GRABBED
 779                                      )))
 780    {
 781       if( SDL_SetWindowDisplayMode( vg.window, &video_mode ) ){
 782          vg_error( "SDL_SetWindowDisplayMode failed: %s", SDL_GetError() );
 783          SDL_Quit();
 784          exit(0);
 785       }
 786    }
 787 #endif
 788    else{
 789       vg_error( "SDL_CreateWindow failed: %s", SDL_GetError() );
 790       exit(0);
 791    }
 792
 793    SDL_RaiseWindow( vg.window );
 794
 795    vg_info( "CreateContext\n" );
 796
 797    /* ????? */
 798    if( SDL_IsTextInputActive() ) SDL_StopTextInput();
 799
 800    /*
 801     * OpenGL loading
 802     */
 803    if( (vg.gl_context = SDL_GL_CreateContext(vg.window) )){
 804       SDL_GL_GetDrawableSize( vg.window, &vg.window_x, &vg.window_y );
 805       vg_success( "Window created (%dx%d)\n", vg.window_x, vg.window_y );
 806    }
 807    else{
 808       vg_error( "SDL_GL_CreateContext failed: %s\n", SDL_GetError() );
 809       SDL_Quit();
 810       exit(0);
 811    }
 812
 813    if( !gladLoadGLLoader((GLADloadproc)SDL_GL_GetProcAddress) ) {
 814       vg_error( "Glad Failed to initialize\n" );
 815       SDL_GL_DeleteContext( vg.gl_context );
 816       SDL_Quit();
 817       exit(0);
 818    }
 819
 820    const unsigned char* glver = glGetString( GL_VERSION );
 821    vg_success( "Load setup complete, OpenGL version: %s\n", glver );
 822
 823    SDL_GL_SetSwapInterval(0); /* disable vsync while loading */
 824
 825    SDL_DisplayMode dispmode;
 826    if( !SDL_GetWindowDisplayMode( vg.window, &dispmode ) ){
 827       if( dispmode.refresh_rate ){
 828          vg.display_refresh_rate = dispmode.refresh_rate;
 829       }
 830    }
 831
 832    if( vg.display_refresh_rate < 25 || vg.display_refresh_rate > 300 ){
 833       vg.display_refresh_rate = 60;
 834    }
 835
 836    vg_info( "Display refresh rate: %d\n", dispmode.refresh_rate );
 837
 838 #if defined(_WIN32) || defined(VG_DEVWINDOW)
 839    vg.fps_limit = vg.display_refresh_rate;
 840 #else
 841    vg.fps_limit = 0;
 842 #endif
 843 }
 844
 845 VG_STATIC void _vg_terminate(void)
 846 {
 847    /* Shutdown */
 848    _vg_console_write_persistent();
 849
 850    SDL_AtomicLock( &vg.sl_status );
 851    vg.engine_status = k_engine_status_none;
 852    SDL_AtomicUnlock( &vg.sl_status );
 853
 854    _vg_loader_free();
 855
 856    vg_success( "If you see this it means everything went.. \"well\".....\n" );
 857
 858    SDL_GL_DeleteContext( vg.gl_context );
 859    SDL_Quit();
 860    exit(0);
 861 }
 862
 863 VG_STATIC void vg_enter( int argc, char *argv[], const char *window_name )
 864 {
 865    vg_rand_seed( 461 );
 866    _vg_process_launch_opts_internal( argc, argv );
 867
 868    /* Systems init */
 869    vg_alloc_quota();
 870    _vg_console_init();
 871
 872    vg_console_reg_var( "fps_limit", &vg.fps_limit, k_var_dtype_i32, 0 );
 873    _vg_init_window( window_name );
 874
 875    vg_async_init();
 876    SDL_SetRelativeMouseMode(1);
 877
 878    vg.thread_id_main = SDL_GetThreadID(NULL);
 879
 880    /* Opengl-required systems */
 881    _vg_ui_init();
 882    _vg_loader_init();
 883
 884    vg.engine_status = k_engine_status_load_internal;
 885
 886    _vg_opengl_sync_init();
 887     vg_loader_start( _vg_load_full, NULL );
 888    _vg_gameloop();
 889    _vg_terminate();
 890 }
 891
 892 VG_STATIC void vg_fatal_error( const char *fmt, ... )
 893 {
 894    va_list args;
 895    va_start( args, fmt );
 896    _vg_log_write( stderr, KRED "  fatal" KWHT "| " KRED, fmt, args );
 897    va_end( args );
 898
 899    vg_print_backtrace();
 900
 901    SDL_AtomicLock( &vg.sl_status );
 902    vg.engine_status = k_engine_status_crashed;
 903    SDL_AtomicUnlock( &vg.sl_status );
 904
 905    if( vg_thread_purpose() == k_thread_purpose_loader ){
 906       longjmp( vg.env_loader_exit, 1 );
 907    }
 908    else{
 909       vg_error( "There is no jump to the error runner thing yet! bai bai\n" );
 910       _vg_terminate();
 911    }
 912 }
 913
 914 #else /* VG_GAME */
 915
 916 #include "vg_log.h"
 917 VG_STATIC void vg_fatal_error( const char *fmt, ... )
 918 {
 919    va_list args;
 920    va_start( args, fmt );
 921    _vg_log_write( stderr, KRED "  fatal" KWHT "| " KRED, fmt, args );
 922    va_end( args );
 923    exit(0);
 924 }
 925
 926 #endif /* VG_GAME */
 927
 928 /*
 929  * Graphic cards will check these to force it to use the GPU
 930  */
 931 u32 NvOptimusEnablement = 0x00000001;
 932 int AmdPowerXpressRequestHighPerformance = 1;
 933
 934 #endif /* VG_HEADER_H */