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DDS cubemap loading check

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phoenix64

Post subject: DDS cubemap loading check

Posted: 23.11.2010, 22:40

Joined: 15.06.2008, 11:21
Posts: 166
Location: Germany

egTexture.cpp:

Code:

      if( !(ddsHeader.caps.dwCaps2 & DDSCAPS2_CM_COMPLETE) )
         raiseError( "DDS cubemap does not contain all cube sides" );

Is this correct? What about

Code:

if((ddsHeader.caps.dwCaps2 & DDSCAPS2_CM_COMPLETE) != DDSCAPS2_CM_COMPLETE )

?
Looks more like what was intended.

EDIT:

Code:

      if( ddsHeader.pixFormat.dwRBitMask == 0x00ff0000 &&
          ddsHeader.pixFormat.dwGBitMask == 0x0000ff00 &&
          ddsHeader.pixFormat.dwBBitMask == 0x000000ff ) pixFmt = pfBGR;
      else
      if( ddsHeader.pixFormat.dwRBitMask == 0x00ff0000 &&
          ddsHeader.pixFormat.dwGBitMask == 0x0000ff00 &&
          ddsHeader.pixFormat.dwBBitMask == 0x000000ff ) pixFmt = pfRGB;

2x the same check?

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marciano

Post subject: Re: DDS cubemap loading check

Posted: 24.11.2010, 22:17

Engine Developer

Joined: 10.09.2006, 15:52
Posts: 1217

The check for the cubemap flags is correct. This is just standard bitmask/flag logic:

Code:

set flag: flags |= MY_FLAG
unset flag: flags &= ~MY_FLAG
check for flag:  if( flags & MY_FLAG )

However, the double format check is wrong of course. I think the second condition should have the red and blue masks swapped.

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phoenix64

Post subject: Re: DDS cubemap loading check

Posted: 25.11.2010, 14:52

Joined: 15.06.2008, 11:21
Posts: 166
Location: Germany

are you checking that at least one cube side exists, or are you checking for all sides? You initialize numSlices to 6, even if only one of the bits within DDSCAPS2_CM_COMPLETE is set, although the file only contains 5 or less sides. But that check will pass in this case as & checks for the existance of at least one bit in the area of that bit mask.

So:

Code:

set flag: flags |= MY_FLAG
unset flag: flags &= ~MY_FLAG
check for flag:  if( flags & MY_FLAG )
check for a single bit in a mask:  if( flags & MY_MASK )
check for ALL bits in a mask:  if( ( flags & MY_MASK ) == MY_MASK )

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marciano

Post subject: Re: DDS cubemap loading check

Posted: 29.11.2010, 21:39

Engine Developer

Joined: 10.09.2006, 15:52
Posts: 1217

Ah right, DDSCAPS2_CM_COMPLETE is a combination of several flags, so you are right. Will be fixed, thanks for bringing this up.

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