win_glimp.c

quakeIII源码这个不用我多说吧

		if ( !( pfd.dwFlags & PFD_STEREO ) && ( r_stereo->integer != 0 ) ) 
		{
			ri.Printf( PRINT_ALL, "...failed to select stereo pixel format\n" );
			glConfig.stereoEnabled = qfalse;
		}
	}

	/*
	** store PFD specifics 
	*/
	glConfig.colorBits = ( int ) pfd.cColorBits;
	glConfig.depthBits = ( int ) pfd.cDepthBits;
	glConfig.stencilBits = ( int ) pfd.cStencilBits;

	return qtrue;
}

/*
** GLW_CreateWindow
**
** Responsible for creating the Win32 window and initializing the OpenGL driver.
*/
#define	WINDOW_STYLE	(WS_OVERLAPPED|WS_BORDER|WS_CAPTION|WS_VISIBLE)
static qboolean GLW_CreateWindow( const char *drivername, int width, int height, int colorbits, qboolean cdsFullscreen )
{
	RECT			r;
	cvar_t			*vid_xpos, *vid_ypos;
	int				stylebits;
	int				x, y, w, h;
	int				exstyle;

	//
	// register the window class if necessary
	//
	if ( !s_classRegistered )
	{
		WNDCLASS wc;

		memset( &wc, 0, sizeof( wc ) );

		wc.style         = 0;
		wc.lpfnWndProc   = (WNDPROC) glw_state.wndproc;
		wc.cbClsExtra    = 0;
		wc.cbWndExtra    = 0;
		wc.hInstance     = g_wv.hInstance;
		wc.hIcon         = LoadIcon( g_wv.hInstance, MAKEINTRESOURCE(IDI_ICON1));
		wc.hCursor       = LoadCursor (NULL,IDC_ARROW);
		wc.hbrBackground = (void *)COLOR_GRAYTEXT;
		wc.lpszMenuName  = 0;
		wc.lpszClassName = WINDOW_CLASS_NAME;

		if ( !RegisterClass( &wc ) )
		{
			ri.Error( ERR_FATAL, "GLW_CreateWindow: could not register window class" );
		}
		s_classRegistered = qtrue;
		ri.Printf( PRINT_ALL, "...registered window class\n" );
	}

	//
	// create the HWND if one does not already exist
	//
	if ( !g_wv.hWnd )
	{
		//
		// compute width and height
		//
		r.left = 0;
		r.top = 0;
		r.right  = width;
		r.bottom = height;

		if ( cdsFullscreen || !Q_stricmp( _3DFX_DRIVER_NAME, drivername ) )
		{
			exstyle = WS_EX_TOPMOST;
			stylebits = WS_POPUP|WS_VISIBLE|WS_SYSMENU;
		}
		else
		{
			exstyle = 0;
			stylebits = WINDOW_STYLE|WS_SYSMENU;
			AdjustWindowRect (&r, stylebits, FALSE);
		}

		w = r.right - r.left;
		h = r.bottom - r.top;

		if ( cdsFullscreen || !Q_stricmp( _3DFX_DRIVER_NAME, drivername ) )
		{
			x = 0;
			y = 0;
		}
		else
		{
			vid_xpos = ri.Cvar_Get ("vid_xpos", "", 0);
			vid_ypos = ri.Cvar_Get ("vid_ypos", "", 0);
			x = vid_xpos->integer;
			y = vid_ypos->integer;

			// adjust window coordinates if necessary 
			// so that the window is completely on screen
			if ( x < 0 )
				x = 0;
			if ( y < 0 )
				y = 0;

			if ( w < glw_state.desktopWidth &&
				 h < glw_state.desktopHeight )
			{
				if ( x + w > glw_state.desktopWidth )
					x = ( glw_state.desktopWidth - w );
				if ( y + h > glw_state.desktopHeight )
					y = ( glw_state.desktopHeight - h );
			}
		}

		g_wv.hWnd = CreateWindowEx (
			 exstyle, 
			 WINDOW_CLASS_NAME,
			 "Quake 3: Arena",
			 stylebits,
			 x, y, w, h,
			 NULL,
			 NULL,
			 g_wv.hInstance,
			 NULL);

		if ( !g_wv.hWnd )
		{
			ri.Error (ERR_FATAL, "GLW_CreateWindow() - Couldn't create window");
		}
	
		ShowWindow( g_wv.hWnd, SW_SHOW );
		UpdateWindow( g_wv.hWnd );
		ri.Printf( PRINT_ALL, "...created window@%d,%d (%dx%d)\n", x, y, w, h );
	}
	else
	{
		ri.Printf( PRINT_ALL, "...window already present, CreateWindowEx skipped\n" );
	}

	if ( !GLW_InitDriver( drivername, colorbits ) )
	{
		ShowWindow( g_wv.hWnd, SW_HIDE );
		DestroyWindow( g_wv.hWnd );
		g_wv.hWnd = NULL;

		return qfalse;
	}

	SetForegroundWindow( g_wv.hWnd );
	SetFocus( g_wv.hWnd );

	return qtrue;
}

static void PrintCDSError( int value )
{
	switch ( value )
	{
	case DISP_CHANGE_RESTART:
		ri.Printf( PRINT_ALL, "restart required\n" );
		break;
	case DISP_CHANGE_BADPARAM:
		ri.Printf( PRINT_ALL, "bad param\n" );
		break;
	case DISP_CHANGE_BADFLAGS:
		ri.Printf( PRINT_ALL, "bad flags\n" );
		break;
	case DISP_CHANGE_FAILED:
		ri.Printf( PRINT_ALL, "DISP_CHANGE_FAILED\n" );
		break;
	case DISP_CHANGE_BADMODE:
		ri.Printf( PRINT_ALL, "bad mode\n" );
		break;
	case DISP_CHANGE_NOTUPDATED:
		ri.Printf( PRINT_ALL, "not updated\n" );
		break;
	default:
		ri.Printf( PRINT_ALL, "unknown error %d\n", value );
		break;
	}
}

/*
** GLW_SetMode
*/
static rserr_t GLW_SetMode( const char *drivername, 
						    int mode, 
							int colorbits, 
							qboolean cdsFullscreen )
{
	HDC hDC;
	const char *win_fs[] = { "W", "FS" };
	int		cdsRet;
	DEVMODE dm;
		
	//
	// print out informational messages
	//
	ri.Printf( PRINT_ALL, "...setting mode %d:", mode );
	if ( !R_GetModeInfo( &glConfig.vidWidth, &glConfig.vidHeight, &glConfig.windowAspect, mode ) )
	{
		ri.Printf( PRINT_ALL, " invalid mode\n" );
		return RSERR_INVALID_MODE;
	}
	ri.Printf( PRINT_ALL, " %d %d %s\n", glConfig.vidWidth, glConfig.vidHeight, win_fs[cdsFullscreen] );

	//
	// check our desktop attributes
	//
	hDC = GetDC( GetDesktopWindow() );
	glw_state.desktopBitsPixel = GetDeviceCaps( hDC, BITSPIXEL );
	glw_state.desktopWidth = GetDeviceCaps( hDC, HORZRES );
	glw_state.desktopHeight = GetDeviceCaps( hDC, VERTRES );
	ReleaseDC( GetDesktopWindow(), hDC );

	//
	// verify desktop bit depth
	//
	if ( glConfig.driverType != GLDRV_VOODOO )
	{
		if ( glw_state.desktopBitsPixel < 15 || glw_state.desktopBitsPixel == 24 )
		{
			if ( colorbits == 0 || ( !cdsFullscreen && colorbits >= 15 ) )
			{
				if ( MessageBox( NULL,
							"It is highly unlikely that a correct\n"
							"windowed display can be initialized with\n"
							"the current desktop display depth.  Select\n"
							"'OK' to try anyway.  Press 'Cancel' if you\n"
							"have a 3Dfx Voodoo, Voodoo-2, or Voodoo Rush\n"
							"3D accelerator installed, or if you otherwise\n"
							"wish to quit.",
							"Low Desktop Color Depth",
							MB_OKCANCEL | MB_ICONEXCLAMATION ) != IDOK )
				{
					return RSERR_INVALID_MODE;
				}
			}
		}
	}

	// do a CDS if needed
	if ( cdsFullscreen )
	{
		memset( &dm, 0, sizeof( dm ) );
		
		dm.dmSize = sizeof( dm );
		
		dm.dmPelsWidth  = glConfig.vidWidth;
		dm.dmPelsHeight = glConfig.vidHeight;
		dm.dmFields     = DM_PELSWIDTH | DM_PELSHEIGHT;

		if ( r_displayRefresh->integer != 0 )
		{
			dm.dmDisplayFrequency = r_displayRefresh->integer;
			dm.dmFields |= DM_DISPLAYFREQUENCY;
		}
		
		// try to change color depth if possible
		if ( colorbits != 0 )
		{
			if ( glw_state.allowdisplaydepthchange )
			{
				dm.dmBitsPerPel = colorbits;
				dm.dmFields |= DM_BITSPERPEL;
				ri.Printf( PRINT_ALL, "...using colorsbits of %d\n", colorbits );
			}
			else
			{
				ri.Printf( PRINT_ALL, "WARNING:...changing depth not supported on Win95 < pre-OSR 2.x\n" );
			}
		}
		else
		{
			ri.Printf( PRINT_ALL, "...using desktop display depth of %d\n", glw_state.desktopBitsPixel );
		}

		//
		// if we're already in fullscreen then just create the window
		//
		if ( glw_state.cdsFullscreen )
		{
			ri.Printf( PRINT_ALL, "...already fullscreen, avoiding redundant CDS\n" );

			if ( !GLW_CreateWindow ( drivername, glConfig.vidWidth, glConfig.vidHeight, colorbits, qtrue ) )
			{
				ri.Printf( PRINT_ALL, "...restoring display settings\n" );
				ChangeDisplaySettings( 0, 0 );
				return RSERR_INVALID_MODE;
			}
		}
		//
		// need to call CDS
		//
		else
		{
			ri.Printf( PRINT_ALL, "...calling CDS: " );
			
			// try setting the exact mode requested, because some drivers don't report
			// the low res modes in EnumDisplaySettings, but still work
			if ( ( cdsRet = ChangeDisplaySettings( &dm, CDS_FULLSCREEN ) ) == DISP_CHANGE_SUCCESSFUL )
			{
				ri.Printf( PRINT_ALL, "ok\n" );

				if ( !GLW_CreateWindow ( drivername, glConfig.vidWidth, glConfig.vidHeight, colorbits, qtrue) )
				{
					ri.Printf( PRINT_ALL, "...restoring display settings\n" );
					ChangeDisplaySettings( 0, 0 );
					return RSERR_INVALID_MODE;
				}
				
				glw_state.cdsFullscreen = qtrue;
			}
			else
			{
				//
				// the exact mode failed, so scan EnumDisplaySettings for the next largest mode
				//
				DEVMODE		devmode;
				int			modeNum;

				ri.Printf( PRINT_ALL, "failed, " );
				
				PrintCDSError( cdsRet );
			
				ri.Printf( PRINT_ALL, "...trying next higher resolution:" );
				
				// we could do a better matching job here...
				for ( modeNum = 0 ; ; modeNum++ ) {
					if ( !EnumDisplaySettings( NULL, modeNum, &devmode ) ) {
						modeNum = -1;
						break;
					}
					if ( devmode.dmPelsWidth >= glConfig.vidWidth
						&& devmode.dmPelsHeight >= glConfig.vidHeight
						&& devmode.dmBitsPerPel >= 15 ) {
						break;
					}
				}

				if ( modeNum != -1 && ( cdsRet = ChangeDisplaySettings( &devmode, CDS_FULLSCREEN ) ) == DISP_CHANGE_SUCCESSFUL )
				{
					ri.Printf( PRINT_ALL, " ok\n" );
					if ( !GLW_CreateWindow( drivername, glConfig.vidWidth, glConfig.vidHeight, colorbits, qtrue) )
					{
						ri.Printf( PRINT_ALL, "...restoring display settings\n" );
						ChangeDisplaySettings( 0, 0 );
						return RSERR_INVALID_MODE;
					}
					
					glw_state.cdsFullscreen = qtrue;
				}
				else
				{
					ri.Printf( PRINT_ALL, " failed, " );
					
					PrintCDSError( cdsRet );
					
					ri.Printf( PRINT_ALL, "...restoring display settings\n" );
					ChangeDisplaySettings( 0, 0 );
					
					glw_state.cdsFullscreen = qfalse;
					glConfig.isFullscreen = qfalse;
					if ( !GLW_CreateWindow( drivername, glConfig.vidWidth, glConfig.vidHeight, colorbits, qfalse) )
					{
						return RSERR_INVALID_MODE;
					}
					return RSERR_INVALID_FULLSCREEN;
				}
			}
		}
	}
	else
	{
		if ( glw_state.cdsFullscreen )
		{
			ChangeDisplaySettings( 0, 0 );
		}

		glw_state.cdsFullscreen = qfalse;
		if ( !GLW_CreateWindow( drivername, glConfig.vidWidth, glConfig.vidHeight, colorbits, qfalse ) )
		{
			return RSERR_INVALID_MODE;
		}
	}

	//
	// success, now check display frequency, although this won't be valid on Voodoo(2)
	//
	memset( &dm, 0, sizeof( dm ) );
	dm.dmSize = sizeof( dm );
	if ( EnumDisplaySettings( NULL, ENUM_CURRENT_SETTINGS, &dm ) )
	{
		glConfig.displayFrequency = dm.dmDisplayFrequency;
	}

	// NOTE: this is overridden later on standalone 3Dfx drivers
	glConfig.isFullscreen = cdsFullscreen;

	return RSERR_OK;
}

/*
** GLW_InitExtensions
*/
static void GLW_InitExtensions( void )
{
	if ( !r_allowExtensions->integer )
	{
		ri.Printf( PRINT_ALL, "*** IGNORING OPENGL EXTENSIONS ***\n" );
		return;
	}

	ri.Printf( PRINT_ALL, "Initializing OpenGL extensions\n" );

	// GL_S3_s3tc
	glConfig.textureCompression = TC_NONE;
	if ( strstr( glConfig.extensions_string, "GL_S3_s3tc" ) )
	{
		if ( r_ext_compressed_textures->integer )
		{
			glConfig.textureCompression = TC_S3TC;
			ri.Printf( PRINT_ALL, "...using GL_S3_s3tc\n" );
		}
		else
		{
			glConfig.textureCompression = TC_NONE;
			ri.Printf( PRINT_ALL, "...ignoring GL_S3_s3tc\n" );
		}
	}
	else
	{
		ri.Printf( PRINT_ALL, "...GL_S3_s3tc not found\n" );
	}

	// GL_EXT_texture_env_add
	glConfig.textureEnvAddAvailable = qfalse;
	if ( strstr( glConfig.extensions_string, "EXT_texture_env_add" ) )
	{
		if ( r_ext_texture_env_add->integer )
		{
			glConfig.textureEnvAddAvailable = qtrue;
			ri.Printf( PRINT_ALL, "...using GL_EXT_texture_env_add\n" );
		}
		else
		{
			glConfig.textureEnvAddAvailable = qfalse;
			ri.Printf( PRINT_ALL, "...ignoring GL_EXT_texture_env_add\n" );
		}
	}
	else
	{
		ri.Printf( PRINT_ALL, "...GL_EXT_texture_env_add not found\n" );
	}

	// WGL_EXT_swap_control
	qwglSwapIntervalEXT = ( BOOL (WINAPI *)(int)) qwglGetProcAddress( "wglSwapIntervalEXT" );
	if ( qwglSwapIntervalEXT )
	{
		ri.Printf( PRINT_ALL, "...using WGL_EXT_swap_control\n" );
		r_swapInterval->modified = qtrue;	// force a set next frame
	}
	else
	{
		ri.Printf( PRINT_ALL, "...WGL_EXT_swap_control not found\n" );
	}

	// GL_ARB_multitexture
	qglMultiTexCoord2fARB = NULL;
	qglActiveTextureARB = NULL;
	qglClientActiveTextureARB = NULL;
	if ( strstr( glConfig.extensions_string, "GL_ARB_multitexture" )  )
	{
		if ( r_ext_multitexture->integer )
		{
			qglMultiTexCoord2fARB = ( PFNGLMULTITEXCOORD2FARBPROC ) qwglGetProcAddress( "glMultiTexCoord2fARB" );
			qglActiveTextureARB = ( PFNGLACTIVETEXTUREARBPROC ) qwglGetProcAddress( "glActiveTextureARB" );
			qglClientActiveTextureARB = ( PFNGLCLIENTACTIVETEXTUREARBPROC ) qwglGetProcAddress( "glClientActiveTextureARB" );

			if ( qglActiveTextureARB )
			{
				qglGetIntegerv( GL_MAX_ACTIVE_TEXTURES_ARB, &glConfig.maxActiveTextures );

				if ( glConfig.maxActiveTextures > 1 )
				{
					ri.Printf( PRINT_ALL, "...using GL_ARB_multitexture\n" );
				}
				else
				{
					qglMultiTexCoord2fARB = NULL;
					qglActiveTextureARB = NULL;
					qglClientActiveTextureARB = NULL;
					ri.Printf( PRINT_ALL, "...not using GL_ARB_multitexture, < 2 texture units\n" );
				}
			}
		}
		else
		{
			ri.Printf( PRINT_ALL, "...ignoring GL_ARB_multitexture\n" );
		}
	}
	else
	{
		ri.Printf( PRINT_ALL, "...GL_ARB_multitexture not found\n" );
	}

	// GL_EXT_compiled_vertex_array
	qglLockArraysEXT = NULL;
	qglUnlockArraysEXT = NULL;
	if ( strstr( glConfig.extensions_string, "GL_EXT_compiled_vertex_array" ) && ( glConfig.hardwareType != GLHW_RIVA128 ) )
	{
		if ( r_ext_compiled_vertex_array->integer )
		{
			ri.Printf( PRINT_ALL, "...using GL_EXT_compiled_vertex_array\n" );
			qglLockArraysEXT = ( void ( APIENTRY * )( int, int ) ) qwglGetProcAddress( "glLockArraysEXT" );
			qglUnlockArraysEXT = ( void ( APIENTRY * )( void ) ) qwglGetProcAddress( "glUnlockArraysEXT" );
			if (!qglLockArraysEXT || !qglUnlockArraysEXT) {
				ri.Error (ERR_FATAL, "bad getprocaddress");
			}
		}
		else
		{
			ri.Printf( PRINT_ALL, "...ignoring GL_EXT_compiled_vertex_array\n" );
		}
	}
	else
	{
		ri.Printf( PRINT_ALL, "...GL_EXT_compiled_vertex_array not found\n" );
	}

	// WGL_3DFX_gamma_control
	qwglGetDeviceGammaRamp3DFX = NULL;
	qwglSetDeviceGammaRamp3DFX = NULL;

	if ( strstr( glConfig.extensions_string, "WGL_3DFX_gamma_control" ) )
	{
		if ( !r_ignorehwgamma->integer && r_ext_gamma_control->integer )
		{
			qwglGetDeviceGammaRamp3DFX = ( BOOL ( WINAPI * )( HDC, LPVOID ) ) qwglGetProcAddress( "wglGetDeviceGammaRamp3DFX" );
			qwglSetDeviceGammaRamp3DFX = ( BOOL ( WINAPI * )( HDC, LPVOID ) ) qwglGetProcAddress( "wglSetDeviceGammaRamp3DFX" );

			if ( qwglGetDeviceGammaRamp3DFX && qwglSetDeviceGammaRamp3DFX )
			{
				ri.Printf( PRINT_ALL, "...using WGL_3DFX_gamma_control\n" );
			}
			else
			{
				qwglGetDeviceGammaRamp3DFX = NULL;
				qwglSetDeviceGammaRamp3DFX = NULL;
			}
		}