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 {
 129    /* Engine sync */
 130    SDL_Window     *window;
 131    SDL_GLContext  gl_context;
 132
 133    SDL_sem *sem_loader;        /* allows only one loader at a time */
 134
 135    jmp_buf env_loader_exit;
 136
 137    SDL_threadID  thread_id_main,
 138                  thread_id_loader;
 139
 140    SDL_SpinLock sl_status;
 141    enum engine_status
 142    {
 143       k_engine_status_none,
 144       k_engine_status_load_internal,
 145       k_engine_status_running,
 146       k_engine_status_crashed
 147    }
 148    engine_status;
 149
 150    /* Window information */
 151    int window_x,
 152        window_y,
 153        samples,
 154        window_should_close;
 155
 156    int display_refresh_rate,
 157        fps_limit;             /* 0: use vsync, >0: cap fps to this, no vsync */
 158
 159    enum vsync_feature
 160    {
 161       k_vsync_feature_disabled=0,
 162       k_vsync_feature_enabled=1,
 163       k_vsync_feature_enabled_adaptive=2,
 164       k_vsync_feature_error=3
 165    }
 166    vsync_feature;
 167
 168    double mouse_pos[2];
 169    v2f mouse_delta,
 170        mouse_wheel;
 171
 172    /* Runtime */
 173    double time,
 174           time_delta,
 175           time_rate,
 176
 177           time_fixed_accumulator,
 178           time_fixed_extrapolate,
 179           time_frame_delta;
 180
 181    u64 time_hp, time_hp_last, time_spinning;
 182
 183    int fixed_iterations;
 184
 185    enum engine_stage
 186    {
 187       k_engine_stage_none,
 188       k_engine_stage_update,
 189       k_engine_stage_update_fixed,
 190       k_engine_stage_rendering,
 191       k_engine_stage_ui
 192    }
 193    engine_stage;
 194
 195    /* graphics */
 196    m4x4f pv;
 197    enum quality_profile
 198    {
 199       k_quality_profile_high = 0,
 200       k_quality_profile_low = 1,
 201    }
 202    quality_profile;
 203
 204    float loader_ring;
 205 }
 206 VG_STATIC vg = { .time_rate = 1.0 };
 207
 208 enum vg_thread_purpose
 209 {
 210    k_thread_purpose_nothing,
 211    k_thread_purpose_main,
 212    k_thread_purpose_loader
 213 };
 214
 215 #include "vg_async.h"
 216
 217 VG_STATIC enum engine_status _vg_engine_status(void)
 218 {
 219    SDL_AtomicLock( &vg.sl_status );
 220    enum engine_status status = vg.engine_status;
 221    SDL_AtomicUnlock( &vg.sl_status );
 222
 223    return status;
 224 }
 225
 226 VG_STATIC enum vg_thread_purpose vg_thread_purpose(void)
 227 {
 228    SDL_AtomicLock( &vg.sl_status );
 229
 230    if( vg.thread_id_main == SDL_GetThreadID(NULL) ){
 231       SDL_AtomicUnlock( &vg.sl_status );
 232       return k_thread_purpose_main;
 233    }
 234    else{
 235       SDL_AtomicUnlock( &vg.sl_status );
 236       return k_thread_purpose_loader;
 237    }
 238 }
 239
 240 VG_STATIC void _vg_opengl_sync_init(void)
 241 {
 242    vg.sem_loader = SDL_CreateSemaphore(1);
 243 }
 244
 245 VG_STATIC void vg_checkgl( const char *src_info );
 246 #define VG_STRINGIT( X ) #X
 247 #define VG_CHECK_GL_ERR() vg_checkgl( __FILE__ ":L" VG_STRINGIT(__LINE__) )
 248
 249 #include "vg_console.h"
 250 #include "vg_profiler.h"
 251 #include "vg_audio.h"
 252 #include "vg_shader.h"
 253 #include "vg_tex.h"
 254 #include "vg_input.h"
 255 #include "vg_ui.h"
 256 #include "vg_imgui.h"
 257 #include "vg_lines.h"
 258 #include "vg_loader.h"
 259 #include "vg_opt.h"
 260
 261 /* Diagnostic */
 262 VG_STATIC struct vg_profile vg_prof_update = {.name="update()"},
 263                             vg_prof_render = {.name="render()"},
 264                             vg_prof_swap   = {.name="swap"};
 265
 266 VG_STATIC void vg_checkgl( const char *src_info )
 267 {
 268    int fail = 0;
 269
 270    GLenum err;
 271    while( (err = glGetError()) != GL_NO_ERROR ){
 272       vg_error( "(%s) OpenGL Error: #%d\n", src_info, err );
 273       fail = 1;
 274    }
 275
 276    if( fail )
 277       vg_fatal_error( "OpenGL Error" );
 278 }
 279
 280 VG_STATIC void async_vg_bake_shaders( void *payload, u32 size )
 281 {
 282    vg_shaders_compile();
 283 }
 284
 285 VG_STATIC void vg_bake_shaders(void)
 286 {
 287    vg_console_reg_cmd( "reload_shaders", vg_shaders_live_recompile, NULL );
 288    vg_async_call( async_vg_bake_shaders, NULL, 0 );
 289 }
 290
 291 void async_internal_complete( void *payload, u32 size )
 292 {
 293    vg_success( "Internal async setup complete\n" );
 294    SDL_AtomicLock( &vg.sl_status );
 295
 296    if( vg.engine_status == k_engine_status_crashed ){
 297       SDL_AtomicUnlock( &vg.sl_status );
 298       return;
 299    }
 300    else{
 301       vg.engine_status = k_engine_status_running;
 302    }
 303
 304    SDL_AtomicUnlock( &vg.sl_status );
 305 }
 306
 307 VG_STATIC void _vg_load_full(void)
 308 {
 309    vg_preload();
 310
 311    /* internal */
 312    vg_loader_step( vg_input_init, vg_input_free );
 313    vg_loader_step( vg_lines_init, NULL );
 314    vg_loader_step( vg_audio_init, vg_audio_free );
 315    vg_loader_step( vg_profiler_init, NULL );
 316
 317    vg_async_call( async_internal_complete, NULL, 0 );
 318
 319    /* client */
 320    vg_load();
 321 }
 322
 323 VG_STATIC void _vg_process_events(void)
 324 {
 325    v2_zero( vg.mouse_wheel );
 326    v2_zero( vg.mouse_delta );
 327
 328    /* Update input */
 329    vg_process_inputs();
 330
 331    /* SDL event loop */
 332    SDL_Event event;
 333    while( SDL_PollEvent( &event ) ){
 334       if( event.type == SDL_KEYDOWN ){
 335          console_proc_key( event.key.keysym );
 336       }
 337       else if( event.type == SDL_MOUSEWHEEL ){
 338          vg.mouse_wheel[0] += event.wheel.preciseX;
 339          vg.mouse_wheel[1] += event.wheel.preciseY;
 340       }
 341       else if( event.type == SDL_CONTROLLERDEVICEADDED ||
 342                event.type == SDL_CONTROLLERDEVICEREMOVED )
 343       {
 344          vg_input_device_event( &event );
 345       }
 346       else if( event.type == SDL_CONTROLLERAXISMOTION ||
 347                event.type == SDL_CONTROLLERBUTTONDOWN ||
 348                event.type == SDL_CONTROLLERBUTTONUP )
 349       {
 350          vg_input_controller_event( &event );
 351       }
 352       else if( event.type == SDL_MOUSEMOTION ){
 353          vg.mouse_delta[0] += event.motion.xrel;
 354          vg.mouse_delta[1] += event.motion.yrel;
 355       }
 356       else if( event.type == SDL_WINDOWEVENT ){
 357          if( event.window.event == SDL_WINDOWEVENT_SIZE_CHANGED ){
 358             int w, h;
 359             SDL_GL_GetDrawableSize( vg.window, &w, &h );
 360
 361             if( !w || !h ){
 362                vg_warn( "Got a invalid framebuffer size: "
 363                         "%dx%d... ignoring\n", w, h );
 364             }
 365             else{
 366                vg.window_x = w;
 367                vg.window_y = h;
 368
 369                vg_framebuffer_resize(w,h);
 370             }
 371          }
 372          else if( event.window.event == SDL_WINDOWEVENT_CLOSE ){
 373             vg.window_should_close = 1;
 374          }
 375       }
 376       else if( event.type == SDL_TEXTINPUT ){
 377          console_proc_utf8( event.text.text );
 378       }
 379    }
 380
 381    vg.mouse_pos[0] += vg.mouse_delta[0];
 382    vg.mouse_pos[1] += vg.mouse_delta[1];
 383 }
 384
 385 VG_STATIC void _vg_gameloop_update(void)
 386 {
 387    vg_profile_begin( &vg_prof_update );
 388
 389    vg.engine_stage = k_engine_stage_update;
 390    vg_update();
 391
 392    /* Fixed update loop */
 393    vg.engine_stage = k_engine_stage_update_fixed;
 394
 395    vg.fixed_iterations = 0;
 396    vg_lines.allow_input = 1;
 397    vg.time_fixed_accumulator += vg.time_delta;
 398
 399    while( vg.time_fixed_accumulator >= VG_TIMESTEP_FIXED ){
 400       vg_update_fixed();
 401       vg_lines.allow_input = 0;
 402
 403       vg.time_fixed_accumulator -= VG_TIMESTEP_FIXED;
 404       //vg.accumulator  = VG_MAX( 0.0, vg.accumulator );
 405
 406       vg.fixed_iterations ++;
 407       if( vg.fixed_iterations == 8 ){
 408          break;
 409       }
 410    }
 411    vg_lines.allow_input = 1;
 412    vg.time_fixed_extrapolate = vg.time_fixed_accumulator / VG_TIMESTEP_FIXED;
 413
 414    vg.engine_stage = k_engine_stage_update;
 415    vg_update_post();
 416    vg_profile_end( &vg_prof_update );
 417 }
 418
 419 VG_STATIC void _vg_gameloop_render(void)
 420 {
 421    vg_profile_begin( &vg_prof_render );
 422
 423    /* render */
 424    vg.engine_stage = k_engine_stage_rendering;
 425    vg_render();
 426
 427    /* ui */
 428    vg.engine_stage = k_engine_stage_ui;
 429    {
 430       ui_prerender();
 431       vg_gui();
 432       ui_postrender();
 433 #if 0
 434       ui_begin( vg.window_x, vg.window_y );
 435
 436       /* TODO */
 437       ui_set_mouse( vg.mouse_pos[0], vg.mouse_pos[1], 0 );
 438
 439       int frame_target = vg.display_refresh_rate;
 440
 441       if( vg.fps_limit > 0 ){
 442          frame_target = vg.fps_limit;
 443       }
 444
 445       vg_profile_drawn(
 446             (struct vg_profile *[]){
 447                &vg_prof_update,&vg_prof_render,&vg_prof_swap}, 3,
 448             (1.0f/(float)frame_target)*1000.0f,
 449             (ui_rect){ 4, 4, 250, 0 }, 0
 450       );
 451
 452       if( vg_profiler ){
 453          char perf[256];
 454
 455          snprintf( perf, 255,
 456                "x: %d y: %d\n"
 457                "refresh: %d (%.1fms)\n"
 458                "samples: %d\n"
 459                "iterations: %d (acc: %.3fms%%)\n"
 460                "time: real(%.2f) delta(%.2f) rate(%.2f)\n"
 461 #ifdef _WIN32
 462                "      extrap(%.2f) frame(%.2f) spin( %llu )\n",
 463 #else
 464                "      extrap(%.2f) frame(%.2f) spin( %lu )\n",
 465 #endif
 466                vg.window_x, vg.window_y,
 467                frame_target, (1.0f/(float)frame_target)*1000.0f,
 468                vg.samples,
 469                vg.fixed_iterations,
 470                (vg.time_fixed_accumulator/VG_TIMESTEP_FIXED)*100.0f,
 471                vg.time, vg.time_delta, vg.time_rate,
 472                vg.time_fixed_extrapolate, vg.time_frame_delta,
 473                vg.time_spinning );
 474
 475          ui_text( (ui_rect){258, 4+24+12+12,0,0},perf, 1,0);
 476       }
 477
 478       /* FIXME */
 479       audio_debug_ui( vg.pv );
 480       vg_gui();
 481       _vg_console_draw();
 482
 483       ui_resolve();
 484       ui_draw( NULL );
 485 #endif
 486    }
 487
 488    vg_profile_end( &vg_prof_render );
 489 }
 490
 491 VG_STATIC int vg_framefilter( double dt )
 492 {
 493    if( (vg.fps_limit <= 0) && (vg.vsync_feature != k_vsync_feature_error) ){
 494       /* turn on vsync if not enabled */
 495
 496       enum vsync_feature requested = k_vsync_feature_enabled;
 497       if( vg.fps_limit < 0 ) requested = k_vsync_feature_enabled_adaptive;
 498
 499       if( vg.vsync_feature != requested ){
 500          vg_info( "Setting swap interval\n" );
 501
 502          int swap_interval = 1;
 503          if( requested == k_vsync_feature_enabled_adaptive ) swap_interval = -1;
 504
 505          if( SDL_GL_SetSwapInterval( swap_interval ) == -1 ){
 506             if( requested == k_vsync_feature_enabled ){
 507                vg_error( "Vsync is not supported by your system\n" );
 508                vg_warn( "You may be overriding it in your"
 509                         " graphics control panel.\n" );
 510             }
 511             else{
 512                vg_error( "Adaptive Vsync is not supported by your system\n" );
 513             }
 514
 515             vg.vsync_feature = k_vsync_feature_error;
 516             vg.fps_limit = vg.display_refresh_rate;
 517
 518             /* TODO: Make popup to notify user that this happened */
 519             return 1;
 520          }
 521          else{
 522             vg_success( "Vsync enabled (%d)\n", requested );
 523             vg.vsync_feature = requested;
 524          }
 525       }
 526
 527       return 0;
 528    }
 529
 530    if( vg.vsync_feature != k_vsync_feature_disabled ){
 531       SDL_GL_SetSwapInterval( 0 );
 532       vg.vsync_feature = k_vsync_feature_disabled;
 533    }
 534
 535    if( vg.fps_limit < 25 ) vg.fps_limit = 25;
 536    if( vg.fps_limit > 300 ) vg.fps_limit = 300;
 537
 538    double min_frametime = 1.0/(double)vg.fps_limit;
 539    if( vg.time_frame_delta < min_frametime ){
 540       /* TODO: we can use high res nanosleep on Linux here */
 541       double sleep_ms = (min_frametime-vg.time_frame_delta) * 1000.0;
 542       u32 ms = (u32)floor( sleep_ms );
 543
 544       if( ms ){
 545          SDL_Delay( ms );
 546       }
 547       else{
 548          vg.time_spinning ++;
 549       }
 550
 551       return 1;
 552    }
 553
 554    return 0;
 555 }
 556
 557 VG_STATIC int _vg_crashscreen(void)
 558 {
 559 #if 0
 560    if( vg_getkey( SDLK_ESCAPE ) )
 561       return 1;
 562 #endif
 563
 564    glBindFramebuffer( GL_FRAMEBUFFER, 0 );
 565    glEnable(GL_BLEND);
 566    glDisable(GL_DEPTH_TEST);
 567    glBlendFunc(GL_ONE_MINUS_DST_ALPHA, GL_DST_ALPHA);
 568    glBlendEquation(GL_FUNC_ADD);
 569
 570    glClearColor( 0.15f + sinf(vg.time)*0.1f, 0.0f, 0.0f,1.0f );
 571    glClear( GL_COLOR_BUFFER_BIT );
 572    glViewport( 0,0, vg.window_x, vg.window_y );
 573
 574    _vg_render_log();
 575
 576    return 0;
 577 }
 578
 579 VG_STATIC void _vg_gameloop(void)
 580 {
 581    //vg.time_fixed_accumulator = 0.75f * (1.0f/60.0f);
 582
 583    vg.time_hp = SDL_GetPerformanceCounter();
 584    vg.time_hp_last = vg.time_hp;
 585
 586    int post_start = 0;
 587    while(1){
 588
 589       vg.time_hp = SDL_GetPerformanceCounter();
 590       u64 udt = vg.time_hp - vg.time_hp_last;
 591       vg.time_hp_last = vg.time_hp;
 592
 593       double dt = (double)udt / (double)SDL_GetPerformanceFrequency();
 594
 595       vg.time_frame_delta += dt;
 596
 597       if( vg_framefilter( dt ) )
 598          continue;
 599
 600       vg_profile_begin( &vg_prof_swap );
 601       SDL_GL_SwapWindow( vg.window );
 602       vg_profile_end( &vg_prof_swap );
 603
 604       enum engine_status status = _vg_engine_status();
 605
 606       vg.time_delta = vg.time_frame_delta * vg.time_rate;
 607       vg.time += vg.time_delta;
 608
 609       vg_run_async_checked();
 610       _vg_process_events();
 611
 612       if( vg.window_should_close )
 613          break;
 614
 615       if( status == k_engine_status_crashed ){
 616          if( _vg_crashscreen() )
 617             break;
 618       }
 619       else{
 620          if( status == k_engine_status_running ){
 621             _vg_gameloop_update();
 622             _vg_gameloop_render();
 623          }
 624          else{
 625             _vg_loader_render();
 626          }
 627       }
 628
 629       if( vg.loader_ring > 0.01f ){
 630          vg.loader_ring -= vg.time_frame_delta * 0.5f;
 631          _vg_loader_render_ring( vg.loader_ring );
 632       }
 633
 634       vg.time_frame_delta = 0.0;
 635       vg.time_spinning = 0;
 636    }
 637 }
 638
 639 VG_STATIC void _vg_process_launch_opts_internal( int argc, char *argv[] )
 640 {
 641    char *arg;
 642    while( vg_argp( argc, argv ) ){
 643       if( (arg = vg_opt_arg( 'w' )) ){
 644          vg.window_x = atoi( arg );
 645       }
 646
 647       if( (arg = vg_opt_arg( 'h' )) ){
 648          vg.window_y = atoi( arg );
 649       }
 650
 651       if( (arg = vg_long_opt_arg( "samples" )) ){
 652          vg.samples = VG_MAX( 0, VG_MIN( 8, atoi( arg ) ) );
 653       }
 654
 655       if(  vg_long_opt( "use-libc-malloc" ) ){
 656          vg_mem.use_libc_malloc = 1;
 657       }
 658
 659       if( vg_long_opt( "high-performance" ) ){
 660          vg.quality_profile = k_quality_profile_low;
 661       }
 662
 663       vg_launch_opt();
 664    }
 665 }
 666
 667 VG_STATIC void _vg_init_window( const char *window_name )
 668 {
 669    vg_info( "SDL_INIT\n" );
 670
 671    if( SDL_Init( SDL_INIT_VIDEO ) != 0  ){
 672       vg_error( "SDL_Init failed: %s\n", SDL_GetError() );
 673       exit(0);
 674    }
 675
 676    SDL_InitSubSystem( SDL_INIT_AUDIO );
 677    SDL_InitSubSystem( SDL_INIT_GAMECONTROLLER );
 678
 679    SDL_GL_SetAttribute( SDL_GL_DOUBLEBUFFER, 1 );
 680    SDL_GL_SetAttribute( SDL_GL_CONTEXT_MAJOR_VERSION, 3 );
 681    SDL_GL_SetAttribute( SDL_GL_CONTEXT_MINOR_VERSION, 3 );
 682    SDL_GL_SetAttribute( SDL_GL_CONTEXT_PROFILE_MASK,
 683                            SDL_GL_CONTEXT_PROFILE_CORE );
 684
 685    SDL_GL_SetAttribute( SDL_GL_CONTEXT_RELEASE_BEHAVIOR,
 686                            SDL_GL_CONTEXT_RELEASE_BEHAVIOR_FLUSH );
 687
 688    SDL_GL_SetAttribute( SDL_GL_RED_SIZE, 8 );
 689    SDL_GL_SetAttribute( SDL_GL_GREEN_SIZE, 8 );
 690    SDL_GL_SetAttribute( SDL_GL_BLUE_SIZE, 8 );
 691    SDL_GL_SetAttribute( SDL_GL_ALPHA_SIZE, 8 );
 692    SDL_GL_SetAttribute( SDL_GL_STENCIL_SIZE, 0 );
 693
 694    /*
 695     * Get monitor information
 696     */
 697    vg_info( "Getting display count\n" );
 698    int display_count = 0,
 699        display_index = 0,
 700        mode_index = 0;
 701
 702 #ifdef VG_DEVWINDOW
 703    vg.window_x = 1600;
 704    vg.window_y = 1000;
 705 #else
 706
 707    SDL_DisplayMode video_mode;
 708    if( SDL_GetDesktopDisplayMode( display_index, &video_mode ) ){
 709       vg_error( "SDL_GetDesktopDisplayMode failed: %s\n", SDL_GetError() );
 710       SDL_Quit();
 711       exit(0);
 712    }
 713
 714    vg.display_refresh_rate = video_mode.refresh_rate;
 715    vg.window_x = video_mode.w;
 716    vg.window_y = video_mode.h;
 717 #endif
 718
 719 #ifndef _WIN32
 720         SDL_SetHint( "SDL_VIDEO_X11_XINERAMA", "1" );
 721         SDL_SetHint( "SDL_VIDEO_X11_XRANDR", "0" );
 722         SDL_SetHint( "SDL_VIDEO_X11_XVIDMODE", "0" );
 723 #endif
 724
 725    vg_info( "CreateWindow( %d %d @%dhz )\n", vg.window_x, vg.window_y,
 726                                              vg.display_refresh_rate );
 727
 728    /* TODO: Allow selecting closest video mode from launch opts */
 729    if((vg.window = SDL_CreateWindow( window_name,
 730
 731 #ifdef VG_DEVWINDOW
 732          0, 0, vg.window_x, vg.window_y,
 733          SDL_WINDOW_BORDERLESS|SDL_WINDOW_OPENGL
 734       ))){}
 735 #else
 736                                      0, 0,
 737                                      vg.window_x, vg.window_y,
 738
 739                                      SDL_WINDOW_FULLSCREEN_DESKTOP |
 740                                      SDL_WINDOW_OPENGL |
 741                                      SDL_WINDOW_INPUT_GRABBED
 742                                      )))
 743    {
 744       if( SDL_SetWindowDisplayMode( vg.window, &video_mode ) ){
 745          vg_error( "SDL_SetWindowDisplayMode failed: %s", SDL_GetError() );
 746          SDL_Quit();
 747          exit(0);
 748       }
 749    }
 750 #endif
 751    else{
 752       vg_error( "SDL_CreateWindow failed: %s", SDL_GetError() );
 753       exit(0);
 754    }
 755
 756    SDL_RaiseWindow( vg.window );
 757
 758    vg_info( "CreateContext\n" );
 759
 760    /*
 761     * OpenGL loading
 762     */
 763    if( (vg.gl_context = SDL_GL_CreateContext(vg.window) )){
 764       SDL_GL_GetDrawableSize( vg.window, &vg.window_x, &vg.window_y );
 765       vg_success( "Window created (%dx%d)\n", vg.window_x, vg.window_y );
 766    }
 767    else{
 768       vg_error( "SDL_GL_CreateContext failed: %s\n", SDL_GetError() );
 769       SDL_Quit();
 770       exit(0);
 771    }
 772
 773    if( !gladLoadGLLoader((GLADloadproc)SDL_GL_GetProcAddress) ) {
 774       vg_error( "Glad Failed to initialize\n" );
 775       SDL_GL_DeleteContext( vg.gl_context );
 776       SDL_Quit();
 777       exit(0);
 778    }
 779
 780    const unsigned char* glver = glGetString( GL_VERSION );
 781    vg_success( "Load setup complete, OpenGL version: %s\n", glver );
 782
 783    SDL_GL_SetSwapInterval(0); /* disable vsync while loading */
 784
 785    SDL_DisplayMode dispmode;
 786    if( !SDL_GetWindowDisplayMode( vg.window, &dispmode ) ){
 787       if( dispmode.refresh_rate ){
 788          vg.display_refresh_rate = dispmode.refresh_rate;
 789       }
 790    }
 791
 792    if( vg.display_refresh_rate < 25 || vg.display_refresh_rate > 300 ){
 793       vg.display_refresh_rate = 60;
 794    }
 795
 796    vg_info( "Display refresh rate: %d\n", dispmode.refresh_rate );
 797
 798 #ifdef _WIN32
 799    vg.fps_limit = vg.display_refresh_rate;
 800 #else
 801    /* request vsync by default on linux to avoid screen tearing.
 802     * this does have its own issues with compositing on X11. */
 803    vg.fps_limit = 0;
 804 #endif
 805 }
 806
 807 VG_STATIC void _vg_terminate(void)
 808 {
 809    /* Shutdown */
 810    _vg_console_write_persistent();
 811
 812    SDL_AtomicLock( &vg.sl_status );
 813    vg.engine_status = k_engine_status_none;
 814    SDL_AtomicUnlock( &vg.sl_status );
 815
 816    _vg_loader_free();
 817
 818    vg_success( "If you see this it means everything went.. \"well\".....\n" );
 819
 820    SDL_GL_DeleteContext( vg.gl_context );
 821    SDL_Quit();
 822    exit(0);
 823 }
 824
 825 VG_STATIC void vg_enter( int argc, char *argv[], const char *window_name )
 826 {
 827    _vg_process_launch_opts_internal( argc, argv );
 828
 829    /* Systems init */
 830    vg_alloc_quota();
 831    _vg_console_init();
 832
 833    vg_console_reg_var( "fps_limit", &vg.fps_limit, k_var_dtype_i32, 0 );
 834    _vg_init_window( window_name );
 835
 836    vg_async_init();
 837
 838 #ifndef VG_DEVWINDOW
 839    SDL_SetRelativeMouseMode(1);
 840 #endif
 841
 842    vg.thread_id_main = SDL_GetThreadID(NULL);
 843
 844    /* Opengl-required systems */
 845    _vg_ui_init();
 846    _vg_loader_init();
 847
 848    vg.engine_status = k_engine_status_load_internal;
 849
 850    _vg_opengl_sync_init();
 851     vg_loader_start( _vg_load_full );
 852    _vg_gameloop();
 853    _vg_terminate();
 854 }
 855
 856 VG_STATIC void vg_fatal_error( const char *fmt, ... )
 857 {
 858    va_list args;
 859    va_start( args, fmt );
 860    _vg_log_write( stderr, KRED "  fatal" KWHT "| " KRED, fmt, args );
 861    va_end( args );
 862
 863    vg_print_backtrace();
 864
 865    SDL_AtomicLock( &vg.sl_status );
 866    vg.engine_status = k_engine_status_crashed;
 867    SDL_AtomicUnlock( &vg.sl_status );
 868
 869    if( vg_thread_purpose() == k_thread_purpose_loader ){
 870       longjmp( vg.env_loader_exit, 1 );
 871    }
 872    else{
 873       vg_error( "There is no jump to the error runner thing yet! bai bai\n" );
 874       _vg_terminate();
 875    }
 876 }
 877
 878 #else /* VG_GAME */
 879
 880 #include "vg_log.h"
 881 VG_STATIC void vg_fatal_error( const char *fmt, ... )
 882 {
 883    va_list args;
 884    va_start( args, fmt );
 885    _vg_log_write( stderr, KRED "  fatal" KWHT "| " KRED, fmt, args );
 886    va_end( args );
 887    exit(0);
 888 }
 889
 890 #endif /* VG_GAME */
 891
 892 /*
 893  * Graphic cards will check these to force it to use the GPU
 894  */
 895 u32 NvOptimusEnablement = 0x00000001;
 896 int AmdPowerXpressRequestHighPerformance = 1;
 897
 898 #endif /* VG_HEADER_H */