// Create the buffer surface
static int MakeBufferSurface()
{
int Ret=0;
int UseSys=0;
DDSURFACEDESC ddsd;
UseSys=AutodetectUseSys(pDD);
DispBuff=NULL;
memset(&ddsd,0,sizeof(ddsd));
ddsd.dwSize=sizeof(ddsd);
ddsd.dwFlags=DDSD_CAPS|DDSD_WIDTH|DDSD_HEIGHT;
ddsd.dwWidth=ScrnWidth;
ddsd.dwHeight=ScrnHeight;
TryAgain:
ddsd.ddsCaps.dwCaps=DDSCAPS_OFFSCREENPLAIN;
if (UseSys) ddsd.ddsCaps.dwCaps|=DDSCAPS_SYSTEMMEMORY;
else ddsd.ddsCaps.dwCaps|=DDSCAPS_VIDEOMEMORY;
Ret=pDD->CreateSurface(&ddsd,&DispBuff,NULL);
if (Ret<0 && UseSys!=1) { UseSys=1; goto TryAgain; } // Try again in system memory
if (Ret<0) return 1; if (DispBuff==NULL) return 1;
// Find out the color depth
GetSurfaceFormat(DispBuff,&DispFormat,&DispBpp);
// Clear it
SurfaceClear(DispBuff,0);
return 0;
}
// Create a secondary DD surface for the screen
static int BlitFXMakeSurf()
{
int nRet;
DDSURFACEDESC2 ddsd;
if (BlitFXDD == NULL) {
return 1;
}
nUseSys = nVidTransferMethod;
if (nUseSys < 0) {
nUseSys = AutodetectUseSys();
}
nDirectAccess = 0;
if (nUseSys == 0 && nUseBlitter != 0) {
nDirectAccess = (nVidBlitterOpt[nVidSelect] >> 9) & 1 ^ 1;
}
