SSUTIL.CXX
/******************************Module*Header*******************************\
* Module Name: ssutil.cxx
*
* Screen-saver utility functions
*
* Copyright (c) 1994 Microsoft Corporation
*
\**************************************************************************/
#include <windows.h>
#include <commdlg.h>
#include <scrnsave.h>
#include <GL\gl.h>
#include <memory.h>
#include <string.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <malloc.h>
#include <time.h>
#include "ssintrnl.hxx"
#include "ssutil.hxx"
static OSVERSIONINFO gosvi = {0};
static BOOL gbGLv1_1 = FALSE; // GL version 1.1 boolean
/******************************Public*Routine******************************\
* SSU_ChoosePixelFormat
*
* Local implementation of ChoosePixelFormat
*
* Choose pixel format based on flags.
* This allows us a little a more control than just calling ChoosePixelFormat
\**************************************************************************/
static int
SSU_ChoosePixelFormat( HDC hdc, int flags )
{
int MaxPFDs;
int iBest = 0;
PIXELFORMATDESCRIPTOR pfd;
// Always choose native pixel depth
int cColorBits =
GetDeviceCaps(hdc, BITSPIXEL) * GetDeviceCaps(hdc, PLANES);
BOOL bDoubleBuf = flags & SS_DOUBLEBUF_BIT;
int cDepthBits = 0;
if( SS_HAS_DEPTH16(flags) )
cDepthBits = 16;
else if( SS_HAS_DEPTH32(flags) )
cDepthBits = 32;
int i = 1;
do
{
MaxPFDs = DescribePixelFormat(hdc, i, sizeof(pfd), &pfd);
if ( MaxPFDs <= 0 )
return 0;
if( ! (pfd.dwFlags & PFD_SUPPORT_OPENGL) )
continue;
if( flags & SS_BITMAP_BIT ) {
// need bitmap pixel format
if( ! (pfd.dwFlags & PFD_DRAW_TO_BITMAP) )
continue;
} else {
// need window pixel format
if( ! (pfd.dwFlags & PFD_DRAW_TO_WINDOW) )
continue;
// a window can be double buffered...
if( ( bDoubleBuf && !(pfd.dwFlags & PFD_DOUBLEBUFFER) ) ||
( !bDoubleBuf && (pfd.dwFlags & PFD_DOUBLEBUFFER) ) )
continue;
}
if ( pfd.iPixelType != PFD_TYPE_RGBA )
continue;
if( pfd.cColorBits != cColorBits )
continue;
if( (flags & SS_GENERIC_UNACCELERATED_BIT) &&
((pfd.dwFlags & (PFD_GENERIC_FORMAT|PFD_GENERIC_ACCELERATED))
!= PFD_GENERIC_FORMAT) )
continue;
if( (flags & SS_NO_SYSTEM_PALETTE_BIT) &&
(pfd.dwFlags & PFD_NEED_SYSTEM_PALETTE) )
continue;
if( cDepthBits ) {
if( pfd.cDepthBits < cDepthBits )
continue;
} else {
// No depth buffer required, but use it if nothing better
if( pfd.cDepthBits ) {
iBest = i;
continue;
}
}
// We have found something useful
return i;
} while (++i <= MaxPFDs);
if( iBest )
// not an exact match, but good enough
return iBest;
// If we reach here, we have failed to find a suitable pixel format.
// See if the system can find us one.
memset( &pfd, 0, sizeof( PIXELFORMATDESCRIPTOR ) );
pfd.nSize = sizeof( PIXELFORMATDESCRIPTOR );
pfd.cColorBits = cColorBits;
pfd.cDepthBits = cDepthBits;
pfd.iPixelType = PFD_TYPE_RGBA;
pfd.dwFlags = PFD_SUPPORT_OPENGL;
if( bDoubleBuf )
pfd.dwFlags |= PFD_DOUBLEBUFFER;
if( flags & SS_BITMAP_BIT )
pfd.dwFlags |= PFD_DRAW_TO_BITMAP;
else
pfd.dwFlags |= PFD_DRAW_TO_WINDOW;
if( (flags & SS_GENERIC_UNACCELERATED_BIT) ||
(flags & SS_NO_SYSTEM_PALETTE_BIT) )
// If either of these flags are set, we should be safe specifying a
// 'slow' pixel format that supports bitmap drawing
pfd.dwFlags |= PFD_DRAW_TO_BITMAP;
SS_WARNING( "SSU_ChoosePixelFormat failed, calling ChoosePIxelFormat\n" );
return ChoosePixelFormat( hdc, &pfd );
}
/******************************Public*Routine******************************\
* SSU_SetupPixelFormat
*
* Choose pixel format according to supplied flags. If ppfd is non-NULL,
* call DescribePixelFormat with it.
*
\**************************************************************************/
BOOL
SSU_SetupPixelFormat(HDC hdc, int flags, PIXELFORMATDESCRIPTOR *ppfd )
{
int pixelFormat;
int nTryAgain = 4;
do{
if( (pixelFormat = SSU_ChoosePixelFormat(hdc, flags)) &&
SetPixelFormat(hdc, pixelFormat, NULL) ) {
SS_DBGLEVEL1( SS_LEVEL_INFO,
"SSU_SetupPixelFormat: Setting pixel format %d\n", pixelFormat );
if( ppfd )
DescribePixelFormat(hdc, pixelFormat,
sizeof(PIXELFORMATDESCRIPTOR), ppfd);
return TRUE; // Success
}
// Failed to set pixel format. Try again after waiting a bit (win95
// bug with full screen dos box)
Sleep( 1000 ); // Wait a second between attempts
} while( nTryAgain-- );
return FALSE;
}
/******************************Public*Routine******************************\
* SSU_bNeedPalette
*
\**************************************************************************/
BOOL
SSU_bNeedPalette( PIXELFORMATDESCRIPTOR *ppfd )
{
if (ppfd->dwFlags & PFD_NEED_PALETTE)
return TRUE;
else
return FALSE;
}
/******************************Public*Routine******************************\
* SSU_PixelFormatDescriptorFromDc
*
\**************************************************************************/
int
SSU_PixelFormatDescriptorFromDc( HDC hdc, PIXELFORMATDESCRIPTOR *Pfd )
{
int PfdIndex;
if ( 0 < (PfdIndex = GetPixelFormat( hdc )) )
{
if ( 0 < DescribePixelFormat( hdc, PfdIndex, sizeof(*Pfd), Pfd ) )
{
return(PfdIndex);
}
}
return 0;
}
/******************************Public*Routine******************************\
* ss_ChangeDisplaySettings
*
* Try changing display settings.
* If bitDepth is 0, use current bit depth
*
\**************************************************************************/
BOOL
ss_ChangeDisplaySettings( int width, int height, int bitDepth )
{
int change;
DEVMODE dm = {0};
dm.dmSize = sizeof(dm);
dm.dmFields = DM_PELSWIDTH | DM_PELSHEIGHT;
dm.dmPelsWidth = width;
dm.dmPelsHeight = height;
if( bitDepth != 0 ) {
dm.dmFields |= DM_BITSPERPEL;
dm.dmBitsPerPel = bitDepth;
}
// change = ChangeDisplaySettings(&dm, CDS_TEST);
change = ChangeDisplaySettings(&dm, CDS_FULLSCREEN);
if( change == DISP_CHANGE_SUCCESSFUL )
return TRUE;
else
return FALSE;
}
/******************************Public*Routine******************************\
* ss_QueryDisplaySettings
*
* Find out what diplay resolutions are available.
*
\**************************************************************************/
void
ss_QueryDisplaySettings( void )
{
int i = 0;
DEVMODE devMode = {0};
while( EnumDisplaySettings( NULL, i, &devMode ) ) {
i++;
}
}
/******************************Public*Routine******************************\
* ss_QueryGLVersion
*
* Find out what GL version is being loaded. If it's 1.1, set various
* global capabilities.
*
\**************************************************************************/
void
ss_QueryGLVersion( void )
{
// Get GL version
if( strstr( (char *) glGetString(GL_VERSION), "1.1") ) {
gbGLv1_1 = TRUE;
gbTextureObjects = TRUE;
} else {
gbGLv1_1 = FALSE;
gbTextureObjects = FALSE;
}
#ifdef SS_DEBUG
if( !gbTextureObjects )
DbgPrint( "ss_QueryGLVersion: Texture Objects disabled\n" );
#endif
}
/******************************Public*Routine******************************\
* ss_fOnGL11
*
* True if running on OpenGL v.1.1x
*
\**************************************************************************/
BOOL
ss_fOnGL11( void )
{
return gbGLv1_1;
}
/******************************Public*Routine******************************\
* ss_QueryOSVersion
*
* Query the OS version
*
\**************************************************************************/
void
ss_QueryOSVersion( void )
{
gosvi.dwOSVersionInfoSize = sizeof(gosvi);
GetVersionEx(&gosvi);
}
/******************************Public*Routine******************************\
* ss_fOnNT35
*
* True if running on NT version 3.51 or less
*
\**************************************************************************/
BOOL
ss_fOnNT35( void )
{
static fOnNT35;
static bInited = FALSE;
if( !bInited ) {
if( !gosvi.dwOSVersionInfoSize )
ss_QueryOSVersion();
fOnNT35 =
(
(gosvi.dwPlatformId == VER_PLATFORM_WIN32_NT) &&
(gosvi.dwMajorVersion == 3 && gosvi.dwMinorVersion <= 51)
);
bInited = TRUE;
}
return fOnNT35;
}
/******************************Public*Routine******************************\
* ss_fOnWin95
*
* True if running on Windows 95
*
\**************************************************************************/
BOOL
ss_fOnWin95( void )
{
static fOnWin95;
static bInited = FALSE;
if( !bInited ) {
if( !gosvi.dwOSVersionInfoSize )
ss_QueryOSVersion();
fOnWin95 = ( gosvi.dwPlatformId == VER_PLATFORM_WIN32_WINDOWS );
bInited = TRUE;
}
return fOnWin95;
}
/******************************Public*Routine******************************\
* ss_fPreviewMode
*
* True if running in Display setting's child preview window
*
\**************************************************************************/
BOOL
ss_fPreviewMode( void )
{
return gpss->type == SS_TYPE_PREVIEW;
}
/******************************Public*Routine******************************\
* ss_fFullScreenMode
*
* True if running full screen (/s option)
*
\**************************************************************************/
BOOL
ss_fFullScreenMode( void )
{
return gpss->type == SS_TYPE_FULLSCREEN;
}
BOOL
ss_fConfigMode( void )
{
return gpss->type == SS_TYPE_CONFIG;
}
BOOL
ss_fWindowMode( void )
{
return gpss->type == SS_TYPE_NORMAL;
}
/******************************Public*Routine******************************\
* ss_RedrawDesktop
*
* Causes the entire desktop to be redrawn
*
\**************************************************************************/
BOOL
ss_RedrawDesktop( void )
{
return RedrawWindow( NULL, NULL, NULL, RDW_ERASE | RDW_INVALIDATE |
RDW_ERASENOW | RDW_UPDATENOW | RDW_ALLCHILDREN );
}