protected internal override Texture2D Read(
ContentReader reader,
Texture2D existingInstance
)
{
Texture2D texture = null;
SurfaceFormat surfaceFormat;
if (reader.version < 5)
{
/* These integer values are based on the enum values
* from previous XNA versions.
* -flibit
*/
int legacyFormat = reader.ReadInt32();
if (legacyFormat == 1)
{
surfaceFormat = SurfaceFormat.ColorBgraEXT;
}
else if (legacyFormat == 28)
{
surfaceFormat = SurfaceFormat.Dxt1;
}
else if (legacyFormat == 30)
{
surfaceFormat = SurfaceFormat.Dxt3;
}
else if (legacyFormat == 32)
{
surfaceFormat = SurfaceFormat.Dxt5;
}
else
{
throw new NotSupportedException(
"Unsupported legacy surface format."
);
}
}
else
{
surfaceFormat = (SurfaceFormat)reader.ReadInt32();
}
int width = reader.ReadInt32();
int height = reader.ReadInt32();
int levelCount = reader.ReadInt32();
int levelCountOutput = levelCount;
// Check to see if we need to convert the surface data
SurfaceFormat convertedFormat = surfaceFormat;
if (surfaceFormat == SurfaceFormat.Dxt1 &&
!reader.GraphicsDevice.GLDevice.SupportsDxt1)
{
convertedFormat = SurfaceFormat.Color;
}
else if ((surfaceFormat == SurfaceFormat.Dxt3 ||
surfaceFormat == SurfaceFormat.Dxt5) &&
!reader.GraphicsDevice.GLDevice.SupportsS3tc)
{
convertedFormat = SurfaceFormat.Color;
}
// Check for duplicate instances
if (existingInstance == null)
{
texture = new Texture2D(
reader.GraphicsDevice,
width,
height,
levelCountOutput > 1,
convertedFormat
);
}
else
{
texture = existingInstance;
}
for (int level = 0; level < levelCount; level += 1)
{
int levelDataSizeInBytes = reader.ReadInt32();
byte[] levelData = null; // Don't assign this quite yet...
int levelWidth = width >> level;
int levelHeight = height >> level;
if (level >= levelCountOutput)
{
continue;
}
// Swap the image data if required.
if (reader.platform == 'x')
{
if (surfaceFormat == SurfaceFormat.Color ||
surfaceFormat == SurfaceFormat.ColorBgraEXT)
{
if (levelData == null)
{
levelData = reader.ReadBytes(levelDataSizeInBytes);
}
levelData = X360TexUtil.SwapColor(
levelData
);
}
else if (surfaceFormat == SurfaceFormat.Dxt1)
{
if (levelData == null)
{
levelData = reader.ReadBytes(levelDataSizeInBytes);
}
levelData = X360TexUtil.SwapDxt1(
levelData,
levelWidth,
levelHeight
);
}
else if (surfaceFormat == SurfaceFormat.Dxt3)
{
if (levelData == null)
{
levelData = reader.ReadBytes(levelDataSizeInBytes);
}
levelData = X360TexUtil.SwapDxt3(
levelData,
levelWidth,
levelHeight
);
}
else if (surfaceFormat == SurfaceFormat.Dxt5)
{
if (levelData == null)
{
levelData = reader.ReadBytes(levelDataSizeInBytes);
}
levelData = X360TexUtil.SwapDxt5(
levelData,
levelWidth,
levelHeight
);
}
}
// Convert the image data if required
if (surfaceFormat == SurfaceFormat.Dxt1 &&
!reader.GraphicsDevice.GLDevice.SupportsDxt1)
{
if (levelData == null)
{
levelData = reader.ReadBytes(levelDataSizeInBytes);
}
levelData = DxtUtil.DecompressDxt1(
levelData,
levelWidth,
levelHeight
);
}
else if (surfaceFormat == SurfaceFormat.Dxt3 &&
!reader.GraphicsDevice.GLDevice.SupportsS3tc)
{
if (levelData == null)
{
levelData = reader.ReadBytes(levelDataSizeInBytes);
}
levelData = DxtUtil.DecompressDxt3(
levelData,
levelWidth,
levelHeight
);
}
else if (surfaceFormat == SurfaceFormat.Dxt5 &&
!reader.GraphicsDevice.GLDevice.SupportsS3tc)
{
if (levelData == null)
{
levelData = reader.ReadBytes(levelDataSizeInBytes);
}
levelData = DxtUtil.DecompressDxt5(
levelData,
levelWidth,
levelHeight
);
}
if (levelData == null &&
reader.BaseStream.GetType() != typeof(System.IO.MemoryStream))
{
/* If the ContentReader is not backed by a
* MemoryStream, we have to read the data in.
*/
levelData = reader.ReadBytes(levelDataSizeInBytes);
}
if (levelData != null)
{
/* If we had to convert the data, or get the data from a
* non-MemoryStream, we set the data with our levelData
* reference.
*/
texture.SetData(level, null, levelData, 0, levelData.Length);
}
else
{
/* Ideally, we didn't have to perform any conversion or
* unnecessary reading. Just throw the buffer directly
* into SetData, skipping a redundant byte[] copy.
*/
texture.SetData <byte>(
level,
null,
(((System.IO.MemoryStream)(reader.BaseStream)).GetBuffer()),
(int)reader.BaseStream.Position,
levelDataSizeInBytes
);
reader.BaseStream.Seek(
levelDataSizeInBytes,
System.IO.SeekOrigin.Current
);
}
}
return(texture);
}
protected internal override Texture2D Read(
ContentReader reader,
Texture2D existingInstance
)
{
Texture2D texture = null;
SurfaceFormat surfaceFormat;
if (reader.version < 5)
{
/* These integer values are based on the enum values
* from previous XNA versions.
* -flibit
*/
int legacyFormat = reader.ReadInt32();
if (legacyFormat == 1)
{
surfaceFormat = SurfaceFormat.ColorBgraEXT;
}
else if (legacyFormat == 28)
{
surfaceFormat = SurfaceFormat.Dxt1;
}
else if (legacyFormat == 30)
{
surfaceFormat = SurfaceFormat.Dxt3;
}
else if (legacyFormat == 32)
{
surfaceFormat = SurfaceFormat.Dxt5;
}
else
{
throw new NotSupportedException(
"Unsupported legacy surface format."
);
}
}
else
{
surfaceFormat = (SurfaceFormat)reader.ReadInt32();
}
int width = reader.ReadInt32();
int height = reader.ReadInt32();
int levelCount = reader.ReadInt32();
int levelCountOutput = levelCount;
GraphicsDevice device = reader.ContentManager.GetGraphicsDevice();
// Check to see if we need to convert the surface data
SurfaceFormat convertedFormat = surfaceFormat;
if (surfaceFormat == SurfaceFormat.Dxt1 &&
!device.GLDevice.SupportsDxt1)
{
convertedFormat = SurfaceFormat.Color;
}
else if ((surfaceFormat == SurfaceFormat.Dxt3 ||
surfaceFormat == SurfaceFormat.Dxt5) &&
!device.GLDevice.SupportsS3tc)
{
convertedFormat = SurfaceFormat.Color;
}
// Check for duplicate instances
if (existingInstance == null)
{
texture = new Texture2D(
device,
width,
height,
levelCountOutput > 1,
convertedFormat
);
}
else
{
texture = existingInstance;
}
for (int level = 0; level < levelCount; level += 1)
{
int levelDataSizeInBytes = reader.ReadInt32();
byte[] levelData = null; // Don't assign this quite yet...
int levelWidth = width >> level;
int levelHeight = height >> level;
if (level >= levelCountOutput)
{
continue;
}
// Swap the image data if required.
if (reader.platform == 'x')
{
if (surfaceFormat == SurfaceFormat.Color ||
surfaceFormat == SurfaceFormat.ColorBgraEXT)
{
levelData = X360TexUtil.SwapColor(
reader.ReadBytes(levelDataSizeInBytes)
);
levelDataSizeInBytes = levelData.Length;
}
else if (surfaceFormat == SurfaceFormat.Dxt1)
{
levelData = X360TexUtil.SwapDxt1(
reader.ReadBytes(levelDataSizeInBytes),
levelWidth,
levelHeight
);
levelDataSizeInBytes = levelData.Length;
}
else if (surfaceFormat == SurfaceFormat.Dxt3)
{
levelData = X360TexUtil.SwapDxt3(
reader.ReadBytes(levelDataSizeInBytes),
levelWidth,
levelHeight
);
levelDataSizeInBytes = levelData.Length;
}
else if (surfaceFormat == SurfaceFormat.Dxt5)
{
levelData = X360TexUtil.SwapDxt5(
reader.ReadBytes(levelDataSizeInBytes),
levelWidth,
levelHeight
);
levelDataSizeInBytes = levelData.Length;
}
}
// Convert the image data if required
if (convertedFormat != surfaceFormat)
{
// May already be read in by 'x' conversion
if (levelData == null)
{
levelData = reader.ReadBytes(levelDataSizeInBytes);
}
if (surfaceFormat == SurfaceFormat.Dxt1)
{
levelData = DxtUtil.DecompressDxt1(
levelData,
levelWidth,
levelHeight
);
}
else if (surfaceFormat == SurfaceFormat.Dxt3)
{
levelData = DxtUtil.DecompressDxt3(
levelData,
levelWidth,
levelHeight
);
}
else if (surfaceFormat == SurfaceFormat.Dxt5)
{
levelData = DxtUtil.DecompressDxt5(
levelData,
levelWidth,
levelHeight
);
}
levelDataSizeInBytes = levelData.Length;
}
int levelDataByteOffset = 0;
if (levelData == null)
{
if (reader.BaseStream is MemoryStream &&
((MemoryStream)reader.BaseStream).TryGetBuffer(out levelData))
{
/* Ideally, we didn't have to perform any conversion or
* unnecessary reading. Just throw the buffer directly
* into SetData, skipping a redundant byte[] copy.
*/
levelDataByteOffset = (int)reader.BaseStream.Seek(0, SeekOrigin.Current);
reader.BaseStream.Seek(
levelDataSizeInBytes,
SeekOrigin.Current
);
}
else
{
/* If we don't have to perform any conversion and
* the ContentReader is not backed by a MemoryStream
* with a public buffer, we have to read the data in.
*/
levelData = reader.ReadBytes(levelDataSizeInBytes);
}
}
texture.SetData(
level,
null,
levelData,
levelDataByteOffset,
levelDataSizeInBytes
);
}
return(texture);
}
