201 lines
6 KiB
C
201 lines
6 KiB
C
/******************************Module*Header*******************************\
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* Module Name: pixelfmt.c
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*
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* Pixel format selection
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*
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* Copyright (c) 1994 Microsoft Corporation
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*
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\**************************************************************************/
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#include "mtk.h"
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/******************************Public*Routine******************************\
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* SSU_ChoosePixelFormat
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*
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* Local implementation of ChoosePixelFormat
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*
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* Choose pixel format based on flags.
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* This allows us a little a more control than just calling ChoosePixelFormat
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\**************************************************************************/
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static int
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SSU_ChoosePixelFormat( HDC hdc, int flags )
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{
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int MaxPFDs;
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int iBest = 0;
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int i;
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PIXELFORMATDESCRIPTOR pfd;
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//mf: this don't handle alpha yet...
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// Always choose native pixel depth
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int cColorBits =
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GetDeviceCaps(hdc, BITSPIXEL) * GetDeviceCaps(hdc, PLANES);
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BOOL bDoubleBuf = flags & SS_DOUBLEBUF_BIT;
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int cDepthBits = 0;
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if( SS_HAS_DEPTH16(flags) )
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cDepthBits = 16;
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else if( SS_HAS_DEPTH32(flags) )
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cDepthBits = 32;
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i = 1;
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do
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{
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MaxPFDs = DescribePixelFormat(hdc, i, sizeof(pfd), &pfd);
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if ( MaxPFDs <= 0 )
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return 0;
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if( ! (pfd.dwFlags & PFD_SUPPORT_OPENGL) )
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continue;
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if( flags & SS_BITMAP_BIT ) {
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// need bitmap pixel format
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if( ! (pfd.dwFlags & PFD_DRAW_TO_BITMAP) )
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continue;
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} else {
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// need window pixel format
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if( ! (pfd.dwFlags & PFD_DRAW_TO_WINDOW) )
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continue;
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// a window can be double buffered...
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if( ( bDoubleBuf && !(pfd.dwFlags & PFD_DOUBLEBUFFER) ) ||
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( !bDoubleBuf && (pfd.dwFlags & PFD_DOUBLEBUFFER) ) )
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continue;
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}
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if ( pfd.iPixelType != PFD_TYPE_RGBA )
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continue;
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if( pfd.cColorBits != cColorBits )
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continue;
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if( (flags & SS_GENERIC_UNACCELERATED_BIT) &&
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((pfd.dwFlags & (PFD_GENERIC_FORMAT|PFD_GENERIC_ACCELERATED))
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!= PFD_GENERIC_FORMAT) )
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continue;
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if( (flags & SS_NO_SYSTEM_PALETTE_BIT) &&
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(pfd.dwFlags & PFD_NEED_SYSTEM_PALETTE) )
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continue;
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if( cDepthBits ) {
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if( pfd.cDepthBits < cDepthBits )
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continue;
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} else {
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// No depth buffer required, but use it if nothing better
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if( pfd.cDepthBits ) {
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if( pfd.dwFlags & PFD_GENERIC_ACCELERATED )
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// Accelerated pixel format - we may as well use this, even
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// though we don't need depth. Otherwise if we keep going
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// to find a better match, we run the risk of overstepping
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// all the accelerated formats and picking a slower format.
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return i;
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iBest = i;
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continue;
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}
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}
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// We have found something useful
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return i;
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} while (++i <= MaxPFDs);
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if( iBest )
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// not an exact match, but good enough
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return iBest;
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// If we reach here, we have failed to find a suitable pixel format.
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// See if the system can find us one.
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memset( &pfd, 0, sizeof( PIXELFORMATDESCRIPTOR ) );
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pfd.nSize = sizeof( PIXELFORMATDESCRIPTOR );
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pfd.cColorBits = cColorBits;
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pfd.cDepthBits = cDepthBits;
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pfd.iPixelType = PFD_TYPE_RGBA;
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pfd.dwFlags = PFD_SUPPORT_OPENGL;
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if( bDoubleBuf )
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pfd.dwFlags |= PFD_DOUBLEBUFFER;
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if( flags & SS_BITMAP_BIT )
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pfd.dwFlags |= PFD_DRAW_TO_BITMAP;
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else
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pfd.dwFlags |= PFD_DRAW_TO_WINDOW;
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if( (flags & SS_GENERIC_UNACCELERATED_BIT) ||
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(flags & SS_NO_SYSTEM_PALETTE_BIT) )
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// If either of these flags are set, we should be safe specifying a
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// 'slow' pixel format that supports bitmap drawing
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//mf: DRAW_TO_WINDOW seems to override this...
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pfd.dwFlags |= PFD_DRAW_TO_BITMAP;
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SS_WARNING( "SSU_ChoosePixelFormat failed, calling ChoosePIxelFormat\n" );
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return ChoosePixelFormat( hdc, &pfd );
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}
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/******************************Public*Routine******************************\
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* SSU_SetupPixelFormat
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*
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* Choose pixel format according to supplied flags. If ppfd is non-NULL,
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* call DescribePixelFormat with it.
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*
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\**************************************************************************/
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BOOL
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SSU_SetupPixelFormat(HDC hdc, int flags, PIXELFORMATDESCRIPTOR *ppfd )
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{
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int pixelFormat;
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int nTryAgain = 4;
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do{
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if( (pixelFormat = SSU_ChoosePixelFormat(hdc, flags)) &&
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SetPixelFormat(hdc, pixelFormat, NULL) ) {
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SS_DBGLEVEL1( SS_LEVEL_INFO,
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"SSU_SetupPixelFormat: Setting pixel format %d\n", pixelFormat );
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if( ppfd )
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DescribePixelFormat(hdc, pixelFormat,
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sizeof(PIXELFORMATDESCRIPTOR), ppfd);
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return TRUE; // Success
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}
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// Failed to set pixel format. Try again after waiting a bit (win95
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// bug with full screen dos box)
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Sleep( 1000 ); // Wait a second between attempts
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} while( nTryAgain-- );
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return FALSE;
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}
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/******************************Public*Routine******************************\
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* SSU_bNeedPalette
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*
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\**************************************************************************/
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BOOL
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SSU_bNeedPalette( PIXELFORMATDESCRIPTOR *ppfd )
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{
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if (ppfd->dwFlags & PFD_NEED_PALETTE)
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return TRUE;
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else
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return FALSE;
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}
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/******************************Public*Routine******************************\
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* SSU_PixelFormatDescriptorFromDc
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*
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\**************************************************************************/
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int
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SSU_PixelFormatDescriptorFromDc( HDC hdc, PIXELFORMATDESCRIPTOR *Pfd )
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{
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int PfdIndex;
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if ( 0 < (PfdIndex = GetPixelFormat( hdc )) )
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{
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if ( 0 < DescribePixelFormat( hdc, PfdIndex, sizeof(*Pfd), Pfd ) )
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{
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return(PfdIndex);
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}
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}
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return 0;
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}
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