protected internal override Texture2D Read(ContentReader reader, Texture2D existingInstance)
{
Texture2D texture = null;
SurfaceFormat surfaceFormat;
if (reader.version < 5)
{
SurfaceFormatLegacy legacyFormat = (SurfaceFormatLegacy)reader.ReadInt32();
switch (legacyFormat)
{
case SurfaceFormatLegacy.Dxt1:
surfaceFormat = SurfaceFormat.Dxt1;
break;
case SurfaceFormatLegacy.Dxt3:
surfaceFormat = SurfaceFormat.Dxt3;
break;
case SurfaceFormatLegacy.Dxt5:
surfaceFormat = SurfaceFormat.Dxt5;
break;
case SurfaceFormatLegacy.Color:
surfaceFormat = SurfaceFormat.Color;
break;
default:
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;
// If the system does not fully support Power of Two textures,
// skip any mip maps supplied with any non PoT textures.
if (levelCount > 1 && !reader.GraphicsDevice.GraphicsCapabilities.SupportsNonPowerOfTwo &&
(!MathHelper.IsPowerOfTwo(width) || !MathHelper.IsPowerOfTwo(height)))
{
levelCountOutput = 1;
System.Diagnostics.Debug.WriteLine(
"Device does not support non Power of Two textures. Skipping mipmaps.");
}
SurfaceFormat convertedFormat = surfaceFormat;
switch (surfaceFormat)
{
#if IOS
// At the moment. If a DXT Texture comes in on iOS, it's really a PVR compressed
// texture. We need to use this hack until the content pipeline is implemented.
// For now DXT5 means we're using 4bpp PVRCompression and DXT3 means 2bpp. Look at
// PvrtcBitmapContent.cs for more information.:
case SurfaceFormat.Dxt3:
convertedFormat = SurfaceFormat.RgbaPvrtc2Bpp;
break;
case SurfaceFormat.Dxt5:
convertedFormat = SurfaceFormat.RgbaPvrtc4Bpp;
break;
#else
case SurfaceFormat.Dxt1:
case SurfaceFormat.Dxt1a:
if (!reader.GraphicsDevice.GraphicsCapabilities.SupportsDxt1)
{
convertedFormat = SurfaceFormat.Color;
}
break;
case SurfaceFormat.Dxt3:
case SurfaceFormat.Dxt5:
if (!reader.GraphicsDevice.GraphicsCapabilities.SupportsS3tc)
{
convertedFormat = SurfaceFormat.Color;
}
break;
#endif
case SurfaceFormat.NormalizedByte4:
convertedFormat = SurfaceFormat.Color;
break;
}
if (existingInstance == null)
{
texture = new Texture2D(reader.GraphicsDevice, width, height, levelCountOutput > 1, convertedFormat);
}
else
{
texture = existingInstance;
}
for (int level = 0; level < levelCount; level++)
{
int levelDataSizeInBytes = (reader.ReadInt32());
byte[] levelData = reader.ReadBytes(levelDataSizeInBytes);
int levelWidth = width >> level;
int levelHeight = height >> level;
if (level >= levelCountOutput)
{
continue;
}
//Convert the image data if required
switch (surfaceFormat)
{
#if !IOS
case SurfaceFormat.Dxt1:
case SurfaceFormat.Dxt1a:
if (!reader.GraphicsDevice.GraphicsCapabilities.SupportsDxt1)
{
levelData = DxtUtil.DecompressDxt1(levelData, levelWidth, levelHeight);
}
break;
case SurfaceFormat.Dxt3:
if (!reader.GraphicsDevice.GraphicsCapabilities.SupportsS3tc)
{
levelData = DxtUtil.DecompressDxt3(levelData, levelWidth, levelHeight);
}
break;
case SurfaceFormat.Dxt5:
if (!reader.GraphicsDevice.GraphicsCapabilities.SupportsS3tc)
{
levelData = DxtUtil.DecompressDxt5(levelData, levelWidth, levelHeight);
}
break;
#endif
case SurfaceFormat.Bgr565:
{
/*
* // BGR -> BGR
* int offset = 0;
* for (int y = 0; y < levelHeight; y++)
* {
* for (int x = 0; x < levelWidth; x++)
* {
* ushort pixel = BitConverter.ToUInt16(levelData, offset);
* pixel = (ushort)(((pixel & 0x0FFF) << 4) | ((pixel & 0xF000) >> 12));
* levelData[offset] = (byte)(pixel);
* levelData[offset + 1] = (byte)(pixel >> 8);
* offset += 2;
* }
* }
*/
}
break;
case SurfaceFormat.Bgra5551:
{
#if OPENGL
// Shift the channels to suit OPENGL
int offset = 0;
for (int y = 0; y < levelHeight; y++)
{
for (int x = 0; x < levelWidth; x++)
{
ushort pixel = BitConverter.ToUInt16(levelData, offset);
pixel = (ushort)(((pixel & 0x7FFF) << 1) | ((pixel & 0x8000) >> 15));
levelData[offset] = (byte)(pixel);
levelData[offset + 1] = (byte)(pixel >> 8);
offset += 2;
}
}
#endif
}
break;
case SurfaceFormat.Bgra4444:
{
#if OPENGL
// Shift the channels to suit OPENGL
int offset = 0;
for (int y = 0; y < levelHeight; y++)
{
for (int x = 0; x < levelWidth; x++)
{
ushort pixel = BitConverter.ToUInt16(levelData, offset);
pixel = (ushort)(((pixel & 0x0FFF) << 4) | ((pixel & 0xF000) >> 12));
levelData[offset] = (byte)(pixel);
levelData[offset + 1] = (byte)(pixel >> 8);
offset += 2;
}
}
#endif
}
break;
case SurfaceFormat.NormalizedByte4:
{
int bytesPerPixel = surfaceFormat.GetSize();
int pitch = levelWidth * bytesPerPixel;
for (int y = 0; y < levelHeight; y++)
{
for (int x = 0; x < levelWidth; x++)
{
int color = BitConverter.ToInt32(levelData, y * pitch + x * bytesPerPixel);
levelData[y * pitch + x * 4] = (byte)(((color >> 16) & 0xff)); //R:=W
levelData[y * pitch + x * 4 + 1] = (byte)(((color >> 8) & 0xff)); //G:=V
levelData[y * pitch + x * 4 + 2] = (byte)(((color) & 0xff)); //B:=U
levelData[y * pitch + x * 4 + 3] = (byte)(((color >> 24) & 0xff)); //A:=Q
}
}
}
break;
}
texture.SetData(level, null, levelData, 0, levelData.Length);
}
return(texture);
}
protected internal override Texture2D Read(ContentReader reader, Texture2D existingInstance)
{
Texture2D texture = null;
SurfaceFormat surfaceFormat;
if (reader.version < 5)
{
SurfaceFormatLegacy legacyFormat = (SurfaceFormatLegacy)reader.ReadInt32();
switch (legacyFormat)
{
case SurfaceFormatLegacy.Dxt1:
surfaceFormat = SurfaceFormat.Dxt1;
break;
case SurfaceFormatLegacy.Dxt3:
surfaceFormat = SurfaceFormat.Dxt3;
break;
case SurfaceFormatLegacy.Dxt5:
surfaceFormat = SurfaceFormat.Dxt5;
break;
case SurfaceFormatLegacy.Color:
surfaceFormat = SurfaceFormat.Color;
break;
default:
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;
SurfaceFormat convertedFormat = surfaceFormat;
switch (surfaceFormat)
{
case SurfaceFormat.Dxt1:
case SurfaceFormat.Dxt1a:
convertedFormat = SurfaceFormat.Color;
break;
case SurfaceFormat.Dxt3:
case SurfaceFormat.Dxt5:
convertedFormat = SurfaceFormat.Color;
break;
case SurfaceFormat.NormalizedByte4:
convertedFormat = SurfaceFormat.Color;
break;
}
UnityEngine.Texture2D unityTexture = new UnityEngine.Texture2D(width, height, XnaToUnity.TextureFormat(convertedFormat), levelCountOutput > 1);
for (int level = 0; level < levelCount; level++)
{
int levelDataSizeInBytes = (reader.ReadInt32());
byte[] levelData = reader.ReadBytes(levelDataSizeInBytes);
int levelWidth = width >> level;
int levelHeight = height >> level;
if (level >= levelCountOutput)
{
continue;
}
//Convert the image data if required
switch (surfaceFormat)
{
case SurfaceFormat.Dxt1:
case SurfaceFormat.Dxt1a:
levelData = DxtUtil.DecompressDxt1(levelData, levelWidth, levelHeight);
break;
case SurfaceFormat.Dxt3:
levelData = DxtUtil.DecompressDxt3(levelData, levelWidth, levelHeight);
break;
case SurfaceFormat.Dxt5:
levelData = DxtUtil.DecompressDxt5(levelData, levelWidth, levelHeight);
break;
}
// un-premultiply alpha (instead do it in the shader)
for (int i = 0; i < levelData.Length; i += 4)
{
float r = levelData[i + 0] / 255.0f;
float g = levelData[i + 1] / 255.0f;
float b = levelData[i + 2] / 255.0f;
float a = levelData[i + 3] / 255.0f;
levelData[i + 0] = (byte)(r / a * 255.0f);
levelData[i + 1] = (byte)(g / a * 255.0f);
levelData[i + 2] = (byte)(b / a * 255.0f);
//levelData[i + 0] = 0;
//levelData[i + 1] = 255;
//levelData[i + 2] = 0;
//levelData[i + 3] = 255;
}
// swap rows because unity textures are laid out bottom-top instead of top-bottom
int rowSize = width * 4;
byte[] temp = new byte[rowSize];
for (int i = 0; i < levelData.Length / 2; i += rowSize)
{
for (int j = 0; j < rowSize; j++)
{
temp[j] = levelData[i + j];
}
int p = levelData.Length - (i + rowSize);
for (int j = 0; j < rowSize; j++)
{
levelData[i + j] = levelData[p + j];
}
for (int j = 0; j < rowSize; j++)
{
levelData[p + j] = temp[j];
}
}
UnityEngine.Color[] unityColors = new UnityEngine.Color[levelData.Length * 4];
unityTexture.SetPixels(XnaToUnity.Color(levelData, ref unityColors), level);
unityTexture.Apply();
texture = new Texture2D(unityTexture);
}
return(texture);
}
