src/vg/vg.h

   1 /* Copyright (C) 2021-2022 Harry Godden (hgn) - All Rights Reserved */
   2
   3 #ifndef VG_HEADER_H
   4 #define VG_HEADER_H
   5
   6 #include "vg_platform.h"
   7
   8
   9 #if defined(VG_SERVER) || defined(VG_TOOLS)
  10  #define VG_NON_CLIENT
  11 #endif
  12
  13 #ifndef VG_SERVER
  14 #include "../../dep/glad/glad.h"
  15
  16 #define GLFW_INCLUDE_GLCOREARB
  17
  18 #ifdef _WIN32
  19   #define GLFW_DLL
  20 #endif
  21
  22 #include "../../dep/glfw/glfw3.h"
  23 #endif
  24
  25 #include "vg_stdint.h"
  26
  27 void vg_register_exit( void( *funcptr )(void), const char *name );
  28
  29 #include "vg_m.h"
  30 #include "vg_io.h"
  31 #include "vg_log.h"
  32
  33 #ifdef VG_STEAM
  34 //#include "vg_steamworks.h"
  35 #include "vg_steam.h"
  36 #endif
  37
  38 #ifndef VG_NON_CLIENT
  39 #include "vg_gldiag.h"
  40 #endif
  41
  42 #ifndef VG_NON_CLIENT
  43
  44 struct vg
  45 {
  46    /* Engine sync */
  47    GLFWwindow* window;
  48
  49    vg_mutex     mux_context;
  50    vg_semaphore sem_allow_exec,
  51                 sem_exec_finished,
  52                 sem_loader,
  53                 sem_fatal;
  54    int exec_context;
  55
  56    vg_mutex     mux_engine_status;
  57    enum engine_status
  58    {
  59       k_engine_status_none,
  60       k_engine_status_running,
  61       k_engine_status_crashed
  62    }
  63    engine_status;
  64    const char *str_const_engine_err;
  65    int          is_loaded;
  66
  67    /* Window information */
  68    int window_x,
  69        window_y,
  70        samples;
  71    float refresh_rate;
  72
  73    v2f mouse,
  74        mouse_wheel;
  75
  76    /* Runtime */
  77    double time,
  78           time_delta,
  79           frame_delta,
  80           time_real,
  81           time_real_last,
  82           time_rate,
  83           accumulator;
  84
  85    int fixed_iterations;
  86
  87    enum engine_stage
  88    {
  89       k_engine_stage_none,
  90       k_engine_stage_update,
  91       k_engine_stage_update_fixed,
  92       k_engine_stage_rendering,
  93       k_engine_stage_ui
  94    }
  95    engine_stage;
  96
  97    /* graphics */
  98    m4x4f pv;
  99
 100    /* Gamepad */
 101    GLFWgamepadstate  gamepad;
 102    int                        gamepad_ready;
 103    const char       *gamepad_name;
 104    int                        gamepad_id;
 105 }
 106 static vg = { .time_rate = 1.0 };
 107
 108 struct vg_thread_info
 109 {
 110    enum vg_thread_purpose
 111    {
 112       k_thread_purpose_nothing,
 113       k_thread_purpose_main,
 114       k_thread_purpose_loader
 115    }
 116    purpose;
 117
 118    int gl_context_level;
 119 };
 120
 121 static VG_THREAD_LOCAL struct vg_thread_info vg_thread_info;
 122
 123
 124 //#define VG_SYNC_DEBUG
 125
 126 #ifdef VG_SYNC_DEBUG
 127   #define VG_SYNC_LOG(STR,...) vg_info(STR,vg_thread_info.purpose,##__VA_ARGS__)
 128 #else
 129   #define VG_SYNC_LOG(...)
 130 #endif
 131
 132 static void vg_fatal_exit_loop( const char *error );
 133
 134 static void vg_ensure_engine_running(void)
 135 {
 136    /* Check if the engine is no longer running */
 137    vg_mutex_lock( &vg.mux_engine_status );
 138    if( vg.engine_status != k_engine_status_running )
 139    {
 140       VG_SYNC_LOG( "[%d] Engine is no longer running\n");
 141       vg_mutex_unlock( &vg.mux_engine_status );
 142
 143       /* Safe to disregard loader thread from this point on, elswhere */
 144       if( vg_thread_info.purpose == k_thread_purpose_loader )
 145       {
 146          vg_semaphore_post( &vg.sem_loader );
 147       }
 148
 149       VG_SYNC_LOG( "[%d] about to kill\n");
 150       vg_thread_exit();
 151    }
 152    vg_mutex_unlock( &vg.mux_engine_status );
 153 }
 154
 155 /*
 156  * Sync execution so that the OpenGL context is switched onto this thread.
 157  * Anything after this call will be in a valid context.
 158  */
 159 static void vg_acquire_thread_sync(void)
 160 {
 161    /* We dont want to do anything if this is the main thread */
 162    if( vg_thread_info.purpose == k_thread_purpose_main )
 163       return;
 164
 165    assert( vg_thread_info.purpose == k_thread_purpose_loader );
 166
 167    vg_ensure_engine_running();
 168
 169    /* Check if thread already has the context */
 170    if( vg_thread_info.gl_context_level )
 171    {
 172       vg_thread_info.gl_context_level ++;
 173       VG_SYNC_LOG( "[%d] We already have sync here\n" );
 174       return;
 175    }
 176
 177    vg_mutex_lock( &vg.mux_context );
 178    VG_SYNC_LOG( "[%d] Signal to sync.\n" );
 179    vg.exec_context = 1;
 180    vg_mutex_unlock( &vg.mux_context );
 181
 182    /* wait until told we can go */
 183    VG_SYNC_LOG( "[%d] Waiting to acuire sync.\n" );
 184    vg_semaphore_wait( &vg.sem_allow_exec );
 185    glfwMakeContextCurrent( vg.window );
 186
 187    /* context now valid to work in while we hold up main thread */
 188    VG_SYNC_LOG( "[%d] Context acquired.\n" );
 189    vg_thread_info.gl_context_level ++;
 190 }
 191
 192 /*
 193  * Signify that we are done with the OpenGL context in this thread.
 194  * Anything after this call will be in an undefined context.
 195  */
 196 static void vg_release_thread_sync(void)
 197 {
 198    if( vg_thread_info.purpose == k_thread_purpose_main )
 199       return;
 200
 201    assert( vg_thread_info.purpose == k_thread_purpose_loader );
 202
 203    /* signal that we are done */
 204    vg_thread_info.gl_context_level --;
 205
 206    if( !vg_thread_info.gl_context_level )
 207    {
 208       VG_SYNC_LOG( "[%d] Releasing context.\n" );
 209       glfwMakeContextCurrent( NULL );
 210       vg_semaphore_post( &vg.sem_exec_finished );
 211    }
 212 }
 213
 214 static void vg_run_synced_content(void)
 215 {
 216    assert( vg_thread_info.purpose == k_thread_purpose_main );
 217
 218    vg_mutex_lock( &vg.mux_context );
 219
 220    if( vg.exec_context != 0 )
 221    {
 222       VG_SYNC_LOG( "[%d] Allowing content (%d).\n", vg.exec_context );
 223
 224       /* allow operations to go */
 225       vg_thread_info.gl_context_level = 0;
 226       glfwMakeContextCurrent( NULL );
 227       vg_semaphore_post( &vg.sem_allow_exec );
 228
 229       /* wait for operations to complete */
 230       VG_SYNC_LOG( "[%d] Waiting for content (%d).\n", vg.exec_context );
 231       vg_semaphore_wait( &vg.sem_exec_finished );
 232
 233       /* check if we killed the engine */
 234       vg_ensure_engine_running();
 235
 236       /* re-engage main thread */
 237       VG_SYNC_LOG( "[%d] Re-engaging.\n" );
 238       vg.exec_context = 0;
 239       glfwMakeContextCurrent( vg.window );
 240       vg_thread_info.gl_context_level = 1;
 241    }
 242
 243    vg_mutex_unlock( &vg.mux_context );
 244 }
 245
 246 static void vg_opengl_sync_init(void)
 247 {
 248    vg_semaphore_init( &vg.sem_allow_exec, 0 );
 249    vg_semaphore_init( &vg.sem_exec_finished, 0 );
 250    vg_semaphore_init( &vg.sem_loader, 1 );
 251    vg_semaphore_init( &vg.sem_fatal, 1 );
 252    vg_mutex_init( &vg.mux_context );
 253
 254    vg_set_thread_name( "[vg] Main" );
 255    vg_thread_info.purpose = k_thread_purpose_main;
 256    vg_thread_info.gl_context_level = 1;
 257 }
 258
 259 static void vg_checkgl( const char *src_info );
 260 #define VG_STRINGIT( X ) #X
 261 #define VG_CHECK_GL_ERR() vg_checkgl( __FILE__ ":L" VG_STRINGIT(__LINE__) )
 262
 263 #include "vg_console.h"
 264 #include "vg_profiler.h"
 265 #include "vg_audio.h"
 266 #include "vg_shader.h"
 267 #include "vg_tex.h"
 268 #include "vg_input.h"
 269 #include "vg_ui.h"
 270 #include "vg_lines.h"
 271 #include "vg_debug.h"
 272 #include "vg_loader.h"
 273 #include "vg_opt.h"
 274
 275 /* Diagnostic */
 276 static struct vg_profile vg_prof_update = {.name="update()"},
 277                          vg_prof_render = {.name="render()"};
 278
 279 #define VG_GAMELOOP
 280 static void vg_register(void) VG_GAMELOOP;
 281 static void vg_start(void) VG_GAMELOOP;
 282
 283 static void vg_update(int loaded) VG_GAMELOOP;
 284 static void vg_update_fixed(int loaded) VG_GAMELOOP;
 285 static void vg_update_post(int loaded) VG_GAMELOOP;
 286
 287 static void vg_framebuffer_resize(int w, int h) VG_GAMELOOP;
 288 static void vg_render(void) VG_GAMELOOP;
 289 static void vg_ui(void) VG_GAMELOOP;
 290
 291 static void vg_checkgl( const char *src_info )
 292 {
 293    int fail = 0;
 294
 295    GLenum err;
 296    while( (err = glGetError()) != GL_NO_ERROR )
 297    {
 298       vg_error( "(%s) OpenGL Error: #%d\n", src_info, err );
 299       fail = 1;
 300    }
 301
 302    if( fail )
 303       vg_fatal_exit_loop( "OpenGL Error" );
 304 }
 305
 306 void vg_mouse_callback( GLFWwindow* ptrW, double xpos, double ypos )
 307 {
 308    vg.mouse[0] = xpos;
 309    vg.mouse[1] = ypos;
 310 }
 311
 312 void vg_scroll_callback( GLFWwindow* ptrW, double xoffset, double yoffset )
 313 {
 314    vg.mouse_wheel[0] += xoffset;
 315    vg.mouse_wheel[1] += yoffset;
 316 }
 317
 318 void vg_framebuffer_resize_callback( GLFWwindow *ptrW, int w, int h )
 319 {
 320    if( !w || !h )
 321    {
 322       vg_warn( "Got a invalid framebuffer size: %dx%d... ignoring\n", w, h );
 323       return;
 324    }
 325
 326    vg.window_x = w;
 327    vg.window_y = h;
 328
 329    vg_framebuffer_resize(w,h);
 330 }
 331
 332 static int vg_bake_shaders(void)
 333 {
 334    vg_acquire_thread_sync();
 335
 336    vg_function_push( (struct vg_cmd)
 337    {
 338       .name = "shaders",
 339       .function = vg_shaders_live_recompile
 340    });
 341
 342    if( !vg_shaders_recompile() )
 343    {
 344       vg_shaders_free(NULL);
 345       vg_release_thread_sync();
 346       return 0;
 347    }
 348    else
 349    {
 350       vg_release_thread_sync();
 351       vg_loader_highwater( NULL, vg_shaders_free, NULL );
 352       return 1;
 353    }
 354 }
 355
 356 void vg_preload(void);
 357 void vg_load(void);
 358 static void vg_load_full(void)
 359 {
 360    vg_preload();
 361
 362    /* internal */
 363    vg_loader_highwater( vg_gamepad_init, NULL, NULL );
 364    vg_loader_highwater( vg_lines_init, vg_lines_free, NULL );
 365    vg_loader_highwater( vg_audio_init, vg_audio_free, NULL );
 366    vg_loader_highwater( vg_profiler_init, NULL, NULL );
 367
 368    /* client */
 369    vg_load();
 370
 371    vg_acquire_thread_sync();
 372    vg.is_loaded = 1;
 373    vg_release_thread_sync();
 374 }
 375
 376 static void vg_enter( int argc, char *argv[], const char *window_name )
 377 {
 378    char *arg;
 379    while( vg_argp( argc, argv ) )
 380    {
 381       if( (arg = vg_opt_arg( 'w' )) )
 382       {
 383          vg.window_x = atoi( arg );
 384       }
 385
 386       if( (arg = vg_opt_arg( 'h' )) )
 387       {
 388          vg.window_y = atoi( arg );
 389       }
 390
 391       if( (arg = vg_long_opt_arg( "samples" )) )
 392       {
 393          vg.samples = VG_MAX( 0, VG_MIN( 8, atoi( arg ) ) );
 394       }
 395    }
 396
 397    vg_log_init();
 398    vg_console_init();
 399
 400    glfwInit();
 401    glfwWindowHint( GLFW_CONTEXT_VERSION_MAJOR, 3 );
 402    glfwWindowHint( GLFW_CONTEXT_VERSION_MINOR, 3 );
 403    glfwWindowHint( GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE );
 404    glfwWindowHint( GLFW_OPENGL_DEBUG_CONTEXT, GL_TRUE );
 405    glfwWindowHint( GLFW_CONTEXT_RELEASE_BEHAVIOR, GLFW_RELEASE_BEHAVIOR_FLUSH );
 406
 407    glfwWindowHint( GLFW_RESIZABLE, GLFW_FALSE );
 408    glfwWindowHint( GLFW_DOUBLEBUFFER, GLFW_TRUE );
 409
 410    glfwWindowHint( GLFW_SAMPLES, vg.samples );
 411
 412    GLFWmonitor *monitor_primary = glfwGetPrimaryMonitor();
 413
 414    const GLFWvidmode *mode = glfwGetVideoMode( monitor_primary );
 415    glfwWindowHint( GLFW_RED_BITS, mode->redBits );
 416    glfwWindowHint( GLFW_GREEN_BITS, mode->greenBits );
 417    glfwWindowHint( GLFW_BLUE_BITS, mode->blueBits );
 418
 419    glfwWindowHint( GLFW_REFRESH_RATE, mode->refreshRate );
 420
 421    if( !vg.window_x )
 422       vg.window_x = mode->width;
 423
 424    if( !vg.window_y )
 425       vg.window_y = mode->height;
 426
 427    vg.refresh_rate = mode->refreshRate;
 428
 429    if( (vg.window = glfwCreateWindow(  vg.window_x, vg.window_y,
 430                                        window_name, monitor_primary, NULL)) )
 431    {
 432       glfwGetFramebufferSize( vg.window, &vg.window_x, &vg.window_y );
 433       vg_success( "Window created (%dx%d)\n", vg.window_x, vg.window_y );
 434    }
 435    else
 436    {
 437       vg_error( "GLFW Failed to initialize\n" );
 438       return;
 439    }
 440
 441    /* We need 3.1.2 for correct VSync on windows */
 442    {
 443       int vmaj, vmin, vrev;
 444       glfwGetVersion( &vmaj, &vmin, &vrev );
 445
 446       if( vmaj < 3 ||
 447          (vmaj == 3 && vmin  < 1) ||
 448          (vmaj == 3 && vmin == 1 && vrev < 2 ) )
 449       {
 450          vg_error( "GLFW out of date (%d.%d.%d); (3.1.2 is required)\n",
 451                     vmaj, vmin, vrev );
 452
 453          glfwTerminate();
 454          return;
 455       }
 456
 457       vg_success( "GLFW Version %d.%d.%d\n", vmaj, vmin, vrev );
 458    }
 459
 460    glfwMakeContextCurrent( vg.window );
 461    glfwSwapInterval( 1 );
 462
 463    glfwSetWindowSizeLimits( vg.window, 800, 600, GLFW_DONT_CARE,GLFW_DONT_CARE);
 464    glfwSetFramebufferSizeCallback( vg.window, vg_framebuffer_resize_callback );
 465
 466    glfwSetCursorPosCallback( vg.window, vg_mouse_callback );
 467    glfwSetScrollCallback( vg.window, vg_scroll_callback );
 468
 469    glfwSetCharCallback( vg.window, console_proc_wchar );
 470    glfwSetKeyCallback( vg.window, console_proc_key );
 471 #if 0
 472    glfwSetInputMode(vg_window, GLFW_CURSOR, GLFW_CURSOR_HIDDEN);
 473 #endif
 474
 475    if( !gladLoadGLLoader((GLADloadproc)glfwGetProcAddress) )
 476    {
 477       vg_error( "Glad Failed to initialize\n" );
 478       glfwTerminate();
 479       return;
 480    }
 481
 482    const unsigned char* glver = glGetString( GL_VERSION );
 483    vg_success( "Load setup complete, OpenGL version: %s\n", glver );
 484    vg_run_gfx_diagnostics();
 485
 486    if( !ui_default_init() )
 487       goto il_exit_ui;
 488
 489    if( !vg_loader_init() )
 490       goto il_exit_loader;
 491
 492    vg_mutex_init( &vg.mux_engine_status );
 493    vg.engine_status = k_engine_status_running;
 494
 495    vg_opengl_sync_init();
 496    vg_loader_start();
 497
 498    vg.accumulator = 0.75f * (1.0f/60.0f);
 499
 500    int loaded = 0;
 501    while(1)
 502    {
 503       if( glfwWindowShouldClose( vg.window ) )
 504          break;
 505
 506       v2_copy( (v2f){ 0.0f, 0.0f }, vg.mouse_wheel );
 507       glfwPollEvents();
 508
 509       vg.time_real_last = vg.time_real;
 510       vg.time_real = glfwGetTime();
 511       vg.frame_delta = vg.time_real-vg.time_real_last;
 512
 513       /* scaled time */
 514       vg.time_delta = vg.frame_delta * vg.time_rate;
 515       vg.time += vg.time_delta;
 516
 517       if( vg.is_loaded )
 518       {
 519 #if 0
 520          glClearColor( 0.0f,sinf(vg.time*20.0)*0.5f+0.5f,0.0f,1.0f );
 521          glClear( GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT );
 522 #endif
 523
 524          if( !loaded )
 525          {
 526             vg_start();
 527             loaded = 1;
 528          }
 529       }
 530       else
 531       {
 532          vg_loader_render();
 533       }
 534
 535       /*
 536        * Game logic
 537        * -------------------------------------------------------
 538        */
 539       vg_profile_begin( &vg_prof_update );
 540       vg_update_inputs();
 541
 542       vg.engine_stage = k_engine_stage_update;
 543       vg_update( loaded );
 544
 545       /* Fixed update loop */
 546       vg.engine_stage = k_engine_stage_update_fixed;
 547       vg.accumulator += vg.time_delta;
 548
 549       vg.fixed_iterations = 0;
 550       while( vg.accumulator >= (VG_TIMESTEP_FIXED-0.00125) )
 551       {
 552          vg_update_fixed( loaded );
 553
 554          vg.accumulator -= VG_TIMESTEP_FIXED;
 555          vg.accumulator  = VG_MAX( 0.0, vg.accumulator );
 556
 557          vg.fixed_iterations ++;
 558          if( vg.fixed_iterations == 8 )
 559          {
 560             break;
 561          }
 562       }
 563
 564       /*
 565        * Rendering
 566        * ---------------------------------------------
 567        */
 568       vg.engine_stage = k_engine_stage_update;
 569       vg_update_post( loaded );
 570       vg_profile_end( &vg_prof_update );
 571
 572       vg_profile_begin( &vg_prof_render );
 573
 574       if( loaded )
 575       {
 576          /* render */
 577          vg.engine_stage = k_engine_stage_rendering;
 578          vg_render();
 579
 580          /* ui */
 581          vg.engine_stage = k_engine_stage_ui;
 582          {
 583             ui_begin( &ui_global_ctx, vg.window_x, vg.window_y );
 584             ui_set_mouse( &ui_global_ctx, vg.mouse[0], vg.mouse[1],
 585                   vg_get_button_state( "primary" ) );
 586
 587             vg_profile_drawn(
 588                   (struct vg_profile *[]){&vg_prof_update,&vg_prof_render}, 2,
 589                   (1.0f/(float)vg.refresh_rate)*1000.0f,
 590                   (ui_rect){ 4, 4, 250, 0 }, 0
 591             );
 592
 593             if( vg_profiler )
 594             {
 595
 596                char perf[128];
 597
 598                snprintf( perf, 127,
 599                      "x: %d y: %d\n"
 600                      "refresh: %.1f (%.1fms)\n"
 601                      "samples: %d\n"
 602                      "iterations: %d (acc: %.3fms%%)\n",
 603                      vg.window_x, vg.window_y,
 604                      vg.refresh_rate, (1.0f/vg.refresh_rate)*1000.0f,
 605                      vg.samples,
 606                      vg.fixed_iterations,
 607                      (vg.accumulator/VG_TIMESTEP_FIXED)*100.0f );
 608
 609                ui_text( &ui_global_ctx, (ui_rect){258, 4+24+12,0,0},perf, 1,0);
 610             }
 611
 612             audio_debug_ui( vg.pv );
 613             vg_ui();
 614             vg_console_draw();
 615
 616             ui_resolve( &ui_global_ctx );
 617             ui_draw( &ui_global_ctx, NULL );
 618          }
 619       }
 620
 621       vg_profile_end( &vg_prof_render );
 622
 623       glfwSwapBuffers( vg.window );
 624       vg_run_synced_content();
 625    }
 626
 627    vg_console_write_persistent();
 628
 629    vg_mutex_lock( &vg.mux_engine_status );
 630    vg.engine_status = k_engine_status_none;
 631    vg_mutex_unlock( &vg.mux_engine_status );
 632
 633    vg_loader_free();
 634
 635 il_exit_loader:
 636    ui_default_free();
 637
 638 il_exit_ui:
 639    glfwTerminate();
 640 }
 641
 642 /*
 643  * Immediately transfer away from calling thread into a safe loop, signal for
 644  * others to shutdown, then free everything once the user closes the window.
 645  *
 646  * FIXME(bug): glfwWindowShouldClose() never returns 1 in windows via wine, only
 647  *             when calling the program from outside its normal directory.
 648  *
 649  *             A workaround is placed to skip the error loop on windows builds
 650  */
 651 static void vg_fatal_exit_loop( const char *error )
 652 {
 653    vg_error( "Fatal error: %s\n", error );
 654    assert( vg_semaphore_trywait( &vg.sem_fatal ) );
 655
 656    vg_mutex_lock( &vg.mux_engine_status );
 657
 658    if( vg.engine_status == k_engine_status_none )
 659    {
 660       vg_mutex_unlock( &vg.mux_engine_status );
 661
 662       /* TODO: Correct shutdown before other systems */
 663       exit(0);
 664    }
 665    else
 666    {
 667       vg_mutex_unlock( &vg.mux_engine_status );
 668
 669       /*
 670        * if main
 671        *    if loader running
 672        *       wait until loader checks in, it will die
 673        *    else
 674        *       pass immediately
 675        * else
 676        *    if have context
 677        *       pass immediately
 678        *    else
 679        *       wait for main to get to us, it will never be used again
 680        *
 681        * undefined behaviour:
 682        *    fatal_exit_loop is called in both threads, preventing an appropriate
 683        *                    reaction to the crash. This *should* be made
 684        *                    obvious by the assertion
 685        */
 686       vg_acquire_thread_sync();
 687
 688       vg_mutex_lock( &vg.mux_engine_status );
 689       vg.engine_status = k_engine_status_crashed;
 690       vg.str_const_engine_err = error;
 691       vg_mutex_unlock( &vg.mux_engine_status );
 692
 693       /*
 694        * Wait for loader to finish what it was doing, if it was running.
 695        * Then we can continue in our nice error screen
 696        */
 697       if( vg_thread_info.purpose == k_thread_purpose_main )
 698       {
 699          vg_semaphore_wait( &vg.sem_loader );
 700       }
 701       vg_audio_free(NULL);
 702
 703 #ifndef _WIN32
 704       while(1)
 705       {
 706          if( glfwWindowShouldClose( vg.window ) )
 707             break;
 708
 709          if( glfwGetKey( vg.window, GLFW_KEY_ESCAPE ) )
 710             break;
 711
 712          glfwPollEvents();
 713
 714          glBindFramebuffer( GL_FRAMEBUFFER, 0 );
 715          glEnable(GL_BLEND);
 716          glDisable(GL_DEPTH_TEST);
 717          glBlendFunc(GL_ONE_MINUS_DST_ALPHA, GL_DST_ALPHA);
 718          glBlendEquation(GL_FUNC_ADD);
 719
 720          glClearColor( 0.15f + sinf(glfwGetTime())*0.1f, 0.0f, 0.0f,1.0f );
 721          glClear( GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT );
 722          glViewport( 0,0, vg.window_x, vg.window_y );
 723
 724          vg_render_log();
 725
 726          glfwSwapBuffers( vg.window );
 727       }
 728 #endif
 729
 730       /* Can now shutdown and EXIT */
 731       vg_loader_free();
 732       ui_default_free();
 733
 734       glfwTerminate();
 735       exit(0);
 736    }
 737 }
 738
 739 #else
 740
 741 static void vg_fatal_exit_loop( const char *error )
 742 {
 743    vg_error( "Fatal error: %s\n", error );
 744    exit(0);
 745 }
 746
 747 #endif
 748
 749 /*
 750  * Graphic cards will check these to force it to use the GPU
 751  */
 752 u32 NvOptimusEnablement = 0x00000001;
 753 int AmdPowerXpressRequestHighPerformance = 1;
 754
 755 #endif