linux_glimp.c

quakeIII源码这个不用我多说吧

    {
      if (r_mode->integer != 3)
      {
        if ( !GLW_StartDriverAndSetMode( name, 3, fullscreen ) )
        {
          goto fail;
        }
      } else
        goto fail;
    }

    return qtrue;
  } else
  {
    ri.Printf( PRINT_ALL, "failed\n" );
  }
  fail:

  QGL_Shutdown();

  return qfalse;
}

/*
** XErrorHandler
**   the default X error handler exits the application
**   I found out that on some hosts some operations would raise X errors (GLXUnsupportedPrivateRequest)
**   but those don't seem to be fatal .. so the default would be to just ignore them
**   our implementation mimics the default handler behaviour (not completely cause I'm lazy)
*/
int qXErrorHandler(Display *dpy, XErrorEvent *ev)
{
  static char buf[1024];
  XGetErrorText(dpy, ev->error_code, buf, 1024);
  ri.Printf( PRINT_ALL, "X Error of failed request: %s\n", buf);
  ri.Printf( PRINT_ALL, "  Major opcode of failed request: %d\n", ev->request_code, buf);
  ri.Printf( PRINT_ALL, "  Minor opcode of failed request: %d\n", ev->minor_code);  
  ri.Printf( PRINT_ALL, "  Serial number of failed request: %d\n", ev->serial);
  return 0;
}

/*
** GLimp_Init
**
** This routine is responsible for initializing the OS specific portions
** of OpenGL.  
*/
void GLimp_Init( void )
{
  qboolean attemptedlibGL = qfalse;
  qboolean attempted3Dfx = qfalse;
  qboolean success = qfalse;
  char  buf[1024];
  cvar_t *lastValidRenderer = ri.Cvar_Get( "r_lastValidRenderer", "(uninitialized)", CVAR_ARCHIVE );

  // guarded, as this is only relevant to SMP renderer thread
#ifdef SMP
  if (!XInitThreads())
  {
    Com_Printf("GLimp_Init() - XInitThreads() failed, disabling r_smp\n");
    ri.Cvar_Set( "r_smp", "0" );
  }
#endif

  r_allowSoftwareGL = ri.Cvar_Get( "r_allowSoftwareGL", "0", CVAR_LATCH );

  r_previousglDriver = ri.Cvar_Get( "r_previousglDriver", "", CVAR_ROM );

  InitSig();

  // Hack here so that if the UI 
  if ( *r_previousglDriver->string )
  {
    // The UI changed it on us, hack it back
    // This means the renderer can't be changed on the fly
    ri.Cvar_Set( "r_glDriver", r_previousglDriver->string );
  }
  
  // set up our custom error handler for X failures
  XSetErrorHandler(&qXErrorHandler);

  //
  // load and initialize the specific OpenGL driver
  //
  if ( !GLW_LoadOpenGL( r_glDriver->string ) )
  {
    if ( !Q_stricmp( r_glDriver->string, OPENGL_DRIVER_NAME ) )
    {
      attemptedlibGL = qtrue;
    } else if ( !Q_stricmp( r_glDriver->string, _3DFX_DRIVER_NAME ) )
    {
      attempted3Dfx = qtrue;
    }

    #if 0
    // TTimo
    // https://zerowing.idsoftware.com/bugzilla/show_bug.cgi?id=455
    // old legacy load code, was confusing people who had a bad OpenGL setup
    if ( !attempted3Dfx && !success )
    {
      attempted3Dfx = qtrue;
      if ( GLW_LoadOpenGL( _3DFX_DRIVER_NAME ) )
      {
        ri.Cvar_Set( "r_glDriver", _3DFX_DRIVER_NAME );
        r_glDriver->modified = qfalse;
        success = qtrue;
      }
    }
    #endif

    // try ICD before trying 3Dfx standalone driver
    if ( !attemptedlibGL && !success )
    {
      attemptedlibGL = qtrue;
      if ( GLW_LoadOpenGL( OPENGL_DRIVER_NAME ) )
      {
        ri.Cvar_Set( "r_glDriver", OPENGL_DRIVER_NAME );
        r_glDriver->modified = qfalse;
        success = qtrue;
      }
    }

    if (!success)
      ri.Error( ERR_FATAL, "GLimp_Init() - could not load OpenGL subsystem\n" );

  }

  // Save it in case the UI stomps it
  ri.Cvar_Set( "r_previousglDriver", r_glDriver->string );

  // This values force the UI to disable driver selection
  glConfig.driverType = GLDRV_ICD;
  glConfig.hardwareType = GLHW_GENERIC;

  // get our config strings
  Q_strncpyz( glConfig.vendor_string, qglGetString (GL_VENDOR), sizeof( glConfig.vendor_string ) );
  Q_strncpyz( glConfig.renderer_string, qglGetString (GL_RENDERER), sizeof( glConfig.renderer_string ) );
  if (*glConfig.renderer_string && glConfig.renderer_string[strlen(glConfig.renderer_string) - 1] == '\n')
    glConfig.renderer_string[strlen(glConfig.renderer_string) - 1] = 0;
  Q_strncpyz( glConfig.version_string, qglGetString (GL_VERSION), sizeof( glConfig.version_string ) );
  Q_strncpyz( glConfig.extensions_string, qglGetString (GL_EXTENSIONS), sizeof( glConfig.extensions_string ) );

  //
  // chipset specific configuration
  //
  strcpy( buf, glConfig.renderer_string );
  strlwr( buf );

  //
  // NOTE: if changing cvars, do it within this block.  This allows them
  // to be overridden when testing driver fixes, etc. but only sets
  // them to their default state when the hardware is first installed/run.
  //
  if ( Q_stricmp( lastValidRenderer->string, glConfig.renderer_string ) )
  {
    glConfig.hardwareType = GLHW_GENERIC;

    ri.Cvar_Set( "r_textureMode", "GL_LINEAR_MIPMAP_NEAREST" );

    // VOODOO GRAPHICS w/ 2MB
    if ( Q_stristr( buf, "voodoo graphics/1 tmu/2 mb" ) )
    {
      ri.Cvar_Set( "r_picmip", "2" );
      ri.Cvar_Get( "r_picmip", "1", CVAR_ARCHIVE | CVAR_LATCH );
    } else
    {
      ri.Cvar_Set( "r_picmip", "1" );

      if ( Q_stristr( buf, "rage 128" ) || Q_stristr( buf, "rage128" ) )
      {
        ri.Cvar_Set( "r_finish", "0" );
      }
      // Savage3D and Savage4 should always have trilinear enabled
      else if ( Q_stristr( buf, "savage3d" ) || Q_stristr( buf, "s3 savage4" ) )
      {
        ri.Cvar_Set( "r_texturemode", "GL_LINEAR_MIPMAP_LINEAR" );
      }
    }
  }

  //
  // this is where hardware specific workarounds that should be
  // detected/initialized every startup should go.
  //
  if ( Q_stristr( buf, "banshee" ) || Q_stristr( buf, "Voodoo_Graphics" ) )
  {
    glConfig.hardwareType = GLHW_3DFX_2D3D;
  } else if ( Q_stristr( buf, "rage pro" ) || Q_stristr( buf, "RagePro" ) )
  {
    glConfig.hardwareType = GLHW_RAGEPRO;
  } else if ( Q_stristr( buf, "permedia2" ) )
  {
    glConfig.hardwareType = GLHW_PERMEDIA2;
  } else if ( Q_stristr( buf, "riva 128" ) )
  {
    glConfig.hardwareType = GLHW_RIVA128;
  } else if ( Q_stristr( buf, "riva tnt " ) )
  {
  }

  ri.Cvar_Set( "r_lastValidRenderer", glConfig.renderer_string );

  // initialize extensions
  GLW_InitExtensions();
  GLW_InitGamma();

  InitSig(); // not clear why this is at begin & end of function

  return;
}


/*
** GLimp_EndFrame
** 
** Responsible for doing a swapbuffers and possibly for other stuff
** as yet to be determined.  Probably better not to make this a GLimp
** function and instead do a call to GLimp_SwapBuffers.
*/
void GLimp_EndFrame (void)
{
  // don't flip if drawing to front buffer
  if ( stricmp( r_drawBuffer->string, "GL_FRONT" ) != 0 )
  {
    qglXSwapBuffers(dpy, win);
  }

  // check logging
  QGL_EnableLogging( (qboolean)r_logFile->integer ); // bk001205 - was ->value
}

#ifdef SMP
/*
===========================================================

SMP acceleration

===========================================================
*/

static pthread_mutex_t	smpMutex = PTHREAD_MUTEX_INITIALIZER;

static pthread_cond_t		renderCommandsEvent = PTHREAD_COND_INITIALIZER;
static pthread_cond_t		renderCompletedEvent = PTHREAD_COND_INITIALIZER;

static void (*glimpRenderThread)( void );

static void *GLimp_RenderThreadWrapper( void *arg )
{
	Com_Printf( "Render thread starting\n" );

  glimpRenderThread();

	qglXMakeCurrent( dpy, None, NULL );

	Com_Printf( "Render thread terminating\n" );

	return arg;
}

qboolean GLimp_SpawnRenderThread( void (*function)( void ) )
{
	pthread_t renderThread;
	int ret;

	pthread_mutex_init( &smpMutex, NULL );

	pthread_cond_init( &renderCommandsEvent, NULL );
	pthread_cond_init( &renderCompletedEvent, NULL );

  glimpRenderThread = function;

	ret = pthread_create( &renderThread,
						  NULL,			// attributes
						  GLimp_RenderThreadWrapper,
						  NULL );		// argument
	if ( ret ) {
		ri.Printf( PRINT_ALL, "pthread_create returned %d: %s", ret, strerror( ret ) );
    return qfalse;
	} else {
		ret = pthread_detach( renderThread );
		if ( ret ) {
			ri.Printf( PRINT_ALL, "pthread_detach returned %d: %s", ret, strerror( ret ) );
		}
  }

  return qtrue;
}

static volatile void    *smpData = NULL;
static volatile qboolean smpDataReady;

void *GLimp_RendererSleep( void )
{
	void  *data;

	qglXMakeCurrent( dpy, None, NULL );

	pthread_mutex_lock( &smpMutex );
	{
		smpData = NULL;
		smpDataReady = qfalse;

		// after this, the front end can exit GLimp_FrontEndSleep
		pthread_cond_signal( &renderCompletedEvent );

		while ( !smpDataReady ) {
			pthread_cond_wait( &renderCommandsEvent, &smpMutex );
		}

		data = (void *)smpData;
	}
	pthread_mutex_unlock( &smpMutex );

	qglXMakeCurrent( dpy, win, ctx );

  return data;
}

void GLimp_FrontEndSleep( void )
{
	pthread_mutex_lock( &smpMutex );
	{
		while ( smpData ) {
			pthread_cond_wait( &renderCompletedEvent, &smpMutex );
		}
	}
	pthread_mutex_unlock( &smpMutex );

	qglXMakeCurrent( dpy, win, ctx );
}

void GLimp_WakeRenderer( void *data )
{
	qglXMakeCurrent( dpy, None, NULL );

	pthread_mutex_lock( &smpMutex );
	{
		assert( smpData == NULL );
		smpData = data;
		smpDataReady = qtrue;

		// after this, the renderer can continue through GLimp_RendererSleep
		pthread_cond_signal( &renderCommandsEvent );
	}
	pthread_mutex_unlock( &smpMutex );
}

#else

void GLimp_RenderThreadWrapper( void *stub ) {}
qboolean GLimp_SpawnRenderThread( void (*function)( void ) ) {
	ri.Printf( PRINT_WARNING, "ERROR: SMP support was disabled at compile time\n");
  return qfalse;
}
void *GLimp_RendererSleep( void ) {
  return NULL;
}
void GLimp_FrontEndSleep( void ) {}
void GLimp_WakeRenderer( void *data ) {}

#endif

/*****************************************************************************/
/* MOUSE                                                                     */
/*****************************************************************************/

void IN_Init(void) {
	Com_Printf ("\n------- Input Initialization -------\n");
  // mouse variables
  in_mouse = Cvar_Get ("in_mouse", "1", CVAR_ARCHIVE);
  in_dgamouse = Cvar_Get ("in_dgamouse", "1", CVAR_ARCHIVE);
	
	// turn on-off sub-frame timing of X events
	in_subframe = Cvar_Get ("in_subframe", "1", CVAR_ARCHIVE);
	
	// developer feature, allows to break without loosing mouse pointer
	in_nograb = Cvar_Get ("in_nograb", "0", 0);

  // bk001130 - from cvs.17 (mkv), joystick variables
  in_joystick = Cvar_Get ("in_joystick", "0", CVAR_ARCHIVE|CVAR_LATCH);
  // bk001130 - changed this to match win32
  in_joystickDebug = Cvar_Get ("in_debugjoystick", "0", CVAR_TEMP);
  joy_threshold = Cvar_Get ("joy_threshold", "0.15", CVAR_ARCHIVE); // FIXME: in_joythreshold

  if (in_mouse->value)
    mouse_avail = qtrue;
  else
    mouse_avail = qfalse;

  IN_StartupJoystick( ); // bk001130 - from cvs1.17 (mkv)
	Com_Printf ("------------------------------------\n");
}

void IN_Shutdown(void)
{
  mouse_avail = qfalse;
}

void IN_Frame (void) {

  // bk001130 - from cvs 1.17 (mkv)
  IN_JoyMove(); // FIXME: disable if on desktop?

  if ( cls.keyCatchers & KEYCATCH_CONSOLE )
  {
    // temporarily deactivate if not in the game and
    // running on the desktop
    // voodoo always counts as full screen
    if (Cvar_VariableValue ("r_fullscreen") == 0
        && strcmp( Cvar_VariableString("r_glDriver"), _3DFX_DRIVER_NAME ) )
    {
      IN_DeactivateMouse ();
      return;
    }
  }

  IN_ActivateMouse();
}

void IN_Activate(void)
{
}

// bk001130 - cvs1.17 joystick code (mkv) was here, no linux_joystick.c

void Sys_SendKeyEvents (void) {
  // XEvent event; // bk001204 - unused

  if (!dpy)
    return;
  HandleEvents();
}


// bk010216 - added stubs for non-Linux UNIXes here
// FIXME - use NO_JOYSTICK or something else generic

#if defined( __FreeBSD__ ) // rb010123
void IN_StartupJoystick( void ) {}
void IN_JoyMove( void ) {}
#endif