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