unsigned char * LoadPVRBuffer( const char * fileName, int & width, int & height )
{
width = 0;
height = 0;
MemBufferFile bufferFile( fileName );
MemBuffer buffer = bufferFile.ToMemBuffer( );
if ( buffer.Length < ( int )( sizeof( OVR_PVR_HEADER ) ) )
{
LOG( "Invalid PVR file" );
buffer.FreeData( );
return NULL;
}
const OVR_PVR_HEADER & header = *( OVR_PVR_HEADER * )buffer.Buffer;
if ( header.Version != 0x03525650 )
{
LOG( "Invalid PVR file version" );
buffer.FreeData( );
return NULL;
}
int format = 0;
switch ( header.PixelFormat )
{
case 578721384203708274llu: format = Texture_RGBA; break;
default:
LOG( "Unknown PVR texture format %llu, size %ix%i", header.PixelFormat, width, height );
buffer.FreeData( );
return NULL;
}
// skip the metadata
const UInt32 startTex = sizeof( OVR_PVR_HEADER ) + header.MetaDataSize;
if ( ( startTex < sizeof( OVR_PVR_HEADER ) ) || ( startTex >= buffer.Length ) )
{
LOG( "Invalid PVR header sizes" );
buffer.FreeData( );
return NULL;
}
size_t mipSize = GetOvrTextureSize( format, header.Width, header.Height );
const int outBufferSizeBytes = buffer.Length - startTex;
if ( mipSize > outBufferSizeBytes )
{
buffer.FreeData();
return NULL;
}
width = header.Width;
height = header.Height;
// skip the metadata
unsigned char * outBuffer = ( unsigned char * )malloc( outBufferSizeBytes );
memcpy( outBuffer, ( unsigned char * )buffer.Buffer + startTex, outBufferSizeBytes );
buffer.FreeData( );
return outBuffer;
}
