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