static public void CompressEtc1(ContentProcessorContext context, TextureContent content, bool isSpriteFont)
{
// If sharp alpha is required (for a font texture page), use 16-bit color instead of PVR
if (isSpriteFont)
{
CompressColor16Bit(context, content);
return;
}
var face = content.Faces[0][0];
var alphaRange = CalculateAlphaRange(face);
// Use BGRA4444 for textures with non-opaque alpha values
if (alphaRange != AlphaRange.Opaque)
{
content.ConvertBitmapType(typeof(PixelBitmapContent <Bgra4444>));
}
else
{
// PVR SGX does not handle non-POT ETC1 textures.
// https://code.google.com/p/libgdx/issues/detail?id=1310
// Since we already enforce POT for PVR and DXT in Reach, we will also enforce POT for ETC1
if (!IsPowerOfTwo(face.Width) || !IsPowerOfTwo(face.Height))
{
context.Logger.LogWarning(null, content.Identity, "ETC1 compression requires width and height to be powers of two due to hardware restrictions on some devices. Falling back to BGR565.");
content.ConvertBitmapType(typeof(PixelBitmapContent <Bgr565>));
}
else
{
content.ConvertBitmapType(typeof(Etc1BitmapContent));
}
}
}
public static void CompressPvrtc(ContentProcessorContext context, TextureContent content, bool isSpriteFont)
{
// If sharp alpha is required (for a font texture page), use 16-bit color instead of PVR
if (isSpriteFont)
{
CompressColor16Bit(context, content);
return;
}
// Calculate number of mip levels
var width = content.Faces[0][0].Height;
var height = content.Faces[0][0].Width;
if (!IsPowerOfTwo(width) || !IsPowerOfTwo(height) || (width != height))
{
context.Logger.LogWarning(null, content.Identity, "PVR compression requires width and height to be powers of two and equal. Falling back to 16-bit color.");
CompressColor16Bit(context, content);
return;
}
var face = content.Faces[0][0];
var alphaRange = CalculateAlphaRange(face);
if (alphaRange == AlphaRange.Opaque)
{
content.ConvertBitmapType(typeof(PvrtcRgb4BitmapContent));
}
else
{
content.ConvertBitmapType(typeof(PvrtcRgba4BitmapContent));
}
}
internal static void ChangeTextureToRequestedFormat(TextureContent texture,
Type originalType,
TextureProcessorOutputFormat textureFormat)
{
switch (textureFormat)
{
case TextureProcessorOutputFormat.NoChange:
if (originalType == null)
{
break;
}
texture.ConvertBitmapType(originalType);
return;
case TextureProcessorOutputFormat.Color:
texture.ConvertBitmapType(typeof (PixelBitmapContent<Color>));
return;
case TextureProcessorOutputFormat.DxtCompressed:
BestGuessCompress(texture);
break;
default:
return;
}
}
public static void CompressDxt(ContentProcessorContext context, TextureContent content, bool isSpriteFont)
{
var face = content.Faces[0][0];
if (context.TargetProfile == GraphicsProfile.Reach)
{
if (!IsPowerOfTwo(face.Width) || !IsPowerOfTwo(face.Height))
{
throw new PipelineException("DXT compression requires width and height must be powers of two in Reach graphics profile.");
}
}
// Test the alpha channel to figure out if we have alpha.
var alphaRange = CalculateAlphaRange(face);
if (isSpriteFont)
{
CompressFontDXT3(content);
}
else if (alphaRange == AlphaRange.Opaque)
{
content.ConvertBitmapType(typeof(Dxt1BitmapContent));
}
else if (alphaRange == AlphaRange.Cutout)
{
content.ConvertBitmapType(typeof(Dxt3BitmapContent));
}
else
{
content.ConvertBitmapType(typeof(Dxt5BitmapContent));
}
}
private static void BestGuessCompress(TextureContent texture)
{
texture.ConvertBitmapType(typeof (PixelBitmapContent<Color>));
if (!(texture is Texture3DContent))
{
texture.ConvertBitmapType(HasFractionalAlpha(texture)
? typeof (Dxt5BitmapContent)
: typeof (Dxt1BitmapContent));
}
}
static void Compress(Type targetType, TextureContent content, bool generateMipMaps)
{
var wh = new object[2];
if (generateMipMaps)
{
for (int i = 0; i < content.Faces.Count; ++i)
{
// Only generate mipmaps if there are none already
if (content.Faces[i].Count == 1)
{
var src = content.Faces[i][0];
var w = src.Width;
var h = src.Height;
content.Faces[i].Clear();
wh[0] = w;
wh[1] = h;
var dest = (BitmapContent)Activator.CreateInstance(targetType, wh);
BitmapContent.Copy(src, dest);
content.Faces[i].Add(dest);
while (w > 1 && h > 1)
{
if (w > 1)
{
w = w >> 1;
}
if (h > 1)
{
h = h >> 1;
}
wh[0] = w;
wh[1] = h;
dest = (BitmapContent)Activator.CreateInstance(targetType, wh);
BitmapContent.Copy(src, dest);
content.Faces[i].Add(dest);
}
}
else
{
// Convert the existing mipmaps
var chain = content.Faces[i];
for (int j = 0; j < chain.Count; ++j)
{
var src = chain[j];
wh[0] = src.Width;
wh[1] = src.Height;
var dest = (BitmapContent)Activator.CreateInstance(targetType, wh);
BitmapContent.Copy(src, dest);
chain[j] = dest;
}
}
}
}
else
{
// Converts all existing faces and mipmaps
content.ConvertBitmapType(targetType);
}
}
/// <summary>
/// Compresses TextureContent in a format appropriate to the platform
/// </summary>
public static void CompressTexture(GraphicsProfile profile, TextureContent content, TextureProcessorOutputFormat format, ContentProcessorContext context, bool generateMipmaps, bool sharpAlpha)
{
format = GetTextureFormatForPlatform(format, context.TargetPlatform);
// Make sure we're in a floating point format
content.ConvertBitmapType(typeof(PixelBitmapContent <Vector4>));
switch (format)
{
case TextureProcessorOutputFormat.AtcCompressed:
CompressAti(content, generateMipmaps);
break;
case TextureProcessorOutputFormat.Color16Bit:
CompressColor16Bit(content, generateMipmaps);
break;
case TextureProcessorOutputFormat.DxtCompressed:
CompressDxt(profile, content, generateMipmaps, sharpAlpha);
break;
case TextureProcessorOutputFormat.Etc1Compressed:
CompressEtc1(content, generateMipmaps);
break;
case TextureProcessorOutputFormat.PvrCompressed:
CompressPvrtc(content, generateMipmaps);
break;
}
}
private TextureContent GenerateCubemap(TextureContent input, ContentProcessorContext context)
{
if (input.Faces[1].Count != 0)
{
//its already a cubemap
return base.Process(input, context);
}
TextureCubeContent cubeContent = new TextureCubeContent();
// Convert the input data to Color format, for ease of processing.
input.ConvertBitmapType(typeof(PixelBitmapContent<Color>));
int height = input.Faces[0][0].Height;
int width = input.Faces[0][0].Width / 6;
//split the image into 6 pieces, setup: X+,X-, Y+,Y-, Z+, Z-
cubeContent.Faces[(int)CubeMapFace.PositiveX] = CreateFace(input.Faces[0][0], width, height, 0);
cubeContent.Faces[(int)CubeMapFace.NegativeX] = CreateFace(input.Faces[0][0], width, height, width * 1);
cubeContent.Faces[(int)CubeMapFace.PositiveY] = CreateFace(input.Faces[0][0], width, height, width * 2);
cubeContent.Faces[(int)CubeMapFace.NegativeY] = CreateFace(input.Faces[0][0], width, height, width * 3);
cubeContent.Faces[(int)CubeMapFace.PositiveZ] = CreateFace(input.Faces[0][0], width, height, width * 4);
cubeContent.Faces[(int)CubeMapFace.NegativeZ] = CreateFace(input.Faces[0][0], width, height, width * 5);
// Calculate mipmap data.
cubeContent.GenerateMipmaps(true);
// Compress the cubemap into DXT1 format.
cubeContent.ConvertBitmapType(typeof(Dxt1BitmapContent));
return cubeContent;
}
protected override void PlatformCompressTexture(ContentProcessorContext context, TextureContent content, TextureProcessorOutputFormat format, bool isSpriteFont)
{
format = GetTextureFormatForPlatform(format, context.TargetPlatform);
// Make sure we're in a floating point format
content.ConvertBitmapType(typeof(PixelBitmapContent <Vector4>));
switch (format)
{
case TextureProcessorOutputFormat.AtcCompressed:
GraphicsUtil.CompressAti(context, content, isSpriteFont);
break;
case TextureProcessorOutputFormat.Color16Bit:
GraphicsUtil.CompressColor16Bit(context, content);
break;
case TextureProcessorOutputFormat.DxtCompressed:
GraphicsUtil.CompressDxt(context, content, isSpriteFont);
break;
case TextureProcessorOutputFormat.Etc1Compressed:
GraphicsUtil.CompressEtc1(context, content, isSpriteFont);
break;
case TextureProcessorOutputFormat.PvrCompressed:
GraphicsUtil.CompressPvrtc(context, content, isSpriteFont);
break;
}
}
public override TextureContent Process(TextureContent input, ContentProcessorContext context)
{
input.ConvertBitmapType(typeof(PixelBitmapContent<Color>));
foreach (MipmapChain mipChain in input.Faces)
{
foreach (PixelBitmapContent<Color> bitmap in mipChain)
{
for (int y = 0; y < bitmap.Height; y++)
{
for (int x = 0; x < bitmap.Width; x++)
{
Color c = bitmap.GetPixel(x, y);
c.R = (byte)(c.R * c.A / 255);
c.G = (byte)(c.G * c.A / 255);
c.B = (byte)(c.B * c.A / 255);
bitmap.SetPixel(x, y, c);
}
}
}
}
return base.Process(input, context);
}
public static void CompressDxt(ContentProcessorContext context, TextureContent content, bool isSpriteFont)
{
var face = content.Faces[0][0];
if (context.TargetProfile == GraphicsProfile.Reach)
{
if (!IsPowerOfTwo(face.Width) || !IsPowerOfTwo(face.Height))
{
throw new PipelineException("DXT compression requires width and height must be powers of two in Reach graphics profile.");
}
}
// Test the alpha channel to figure out if we have alpha.
var alphaRange = CalculateAlphaRange(face);
// TODO: This isn't quite right.
//
// We should be generating DXT1 textures for cutout alpha
// as DXT1 supports 1bit alpha and it uses less memory.
//
// XNA never generated DXT3 for textures... it always picked
// between DXT1 for cutouts and DXT5 for fractional alpha.
//
// DXT3 however can produce better results for high frequency
// alpha like a chain link fence where is DXT5 is better for
// low frequency alpha like clouds. I don't know how we can
// pick the right thing in this case without a hint.
//
if (isSpriteFont)
{
CompressFontDXT3(content);
}
else if (alphaRange == AlphaRange.Opaque)
{
content.ConvertBitmapType(typeof(Dxt1BitmapContent));
}
else if (alphaRange == AlphaRange.Cutout)
{
content.ConvertBitmapType(typeof(Dxt3BitmapContent));
}
else
{
content.ConvertBitmapType(typeof(Dxt5BitmapContent));
}
}
static public void CompressColor16Bit(ContentProcessorContext context, TextureContent content)
{
var face = content.Faces[0][0];
var alphaRange = CalculateAlphaRange(face);
if (alphaRange == AlphaRange.Opaque)
{
content.ConvertBitmapType(typeof(PixelBitmapContent <Bgr565>));
}
else if (alphaRange == AlphaRange.Cutout)
{
content.ConvertBitmapType(typeof(PixelBitmapContent <Bgra5551>));
}
else
{
content.ConvertBitmapType(typeof(PixelBitmapContent <Bgra4444>));
}
}
static public void CompressAti(ContentProcessorContext context, TextureContent content, bool isSpriteFont)
{
// If sharp alpha is required (for a font texture page), use 16-bit color instead of PVR
if (isSpriteFont)
{
CompressColor16Bit(context, content);
return;
}
var face = content.Faces[0][0];
var alphaRange = CalculateAlphaRange(face);
if (alphaRange == AlphaRange.Full)
{
content.ConvertBitmapType(typeof(AtcExplicitBitmapContent));
}
else
{
content.ConvertBitmapType(typeof(AtcInterpolatedBitmapContent));
}
}
/// <summary>
/// Performs conversion of the texture content to the correct format.
/// </summary>
/// <param name="context">The processor context.</param>
/// <param name="content">The content to be compressed.</param>
/// <param name="format">The user requested format for compression.</param>
/// <param name="generateMipmaps">If mipmap generation is required.</param>
/// <param name="isSpriteFont">If the texture has represents a sprite font, i.e. is greyscale and has sharp black/white contrast.</param>
public void ConvertTexture(ContentProcessorContext context, TextureContent content, TextureProcessorOutputFormat format, bool generateMipmaps, bool isSpriteFont)
{
// We do nothing in this case.
if (format == TextureProcessorOutputFormat.NoChange)
{
return;
}
// If this is color just make sure the format is right and return it.
if (format == TextureProcessorOutputFormat.Color)
{
content.ConvertBitmapType(typeof(PixelBitmapContent <Color>));
if (generateMipmaps)
{
content.GenerateMipmaps(false);
}
return;
}
// Handle this common compression format.
if (format == TextureProcessorOutputFormat.Color16Bit)
{
GraphicsUtil.CompressColor16Bit(content, generateMipmaps);
return;
}
try
{
// All other formats require platform specific choices.
PlatformCompressTexture(context, content, format, generateMipmaps, isSpriteFont);
}
catch (EntryPointNotFoundException ex)
{
context.Logger.LogImportantMessage("Could not find the entry point to compress the texture. " + ex.ToString());
throw ex;
}
catch (DllNotFoundException ex)
{
context.Logger.LogImportantMessage("Could not compress texture. Required shared lib is missing. " + ex.ToString());
throw ex;
}
catch (Exception ex)
{
context.Logger.LogImportantMessage("Could not convert texture. " + ex.ToString());
throw ex;
}
}
public override TextureContent Process(TextureContent input, ContentProcessorContext context)
{
input.ConvertBitmapType(typeof(PixelBitmapContent<Color>));
foreach (var mipmapChain in input.Faces)
{
for (int i = 0; i < mipmapChain.Count; i++)
{
var bitmap = mipmapChain[i] as PixelBitmapContent<Color>;
int newWidth = (int) ((float) bitmap.Width * Scale);
int newHeight = (int) ((float) bitmap.Height * Scale);
var newBitmap = new PixelBitmapContent<Color>(newWidth, newHeight);
for (int y = 0; y < bitmap.Height; y++)
{
for (int x = 0; x < bitmap.Width; x++)
{
for (int scaleY = 0; scaleY < Scale; scaleY++)
{
for (int scaleX = 0; scaleX < Scale; scaleX++)
{
newBitmap.SetPixel(
(int) (x * Scale) + scaleX,
(int) (y * Scale) + scaleY,
bitmap.GetPixel(x, y));
}
}
}
}
mipmapChain[i] = newBitmap;
}
}
return base.Process(input, context);
}
/// <summary>
/// Compresses TextureContent in a format appropriate to the platform
/// </summary>
public static void CompressTexture(GraphicsProfile profile, TextureContent content, TextureProcessorOutputFormat format, ContentProcessorContext context, bool generateMipmaps, bool sharpAlpha)
{
format = GetTextureFormatForPlatform(format, context.TargetPlatform);
// Make sure we're in a floating point format
content.ConvertBitmapType(typeof(PixelBitmapContent<Vector4>));
switch (format)
{
case TextureProcessorOutputFormat.AtcCompressed:
CompressAti(content, generateMipmaps);
break;
case TextureProcessorOutputFormat.Color16Bit:
CompressColor16Bit(content, generateMipmaps);
break;
case TextureProcessorOutputFormat.DxtCompressed:
CompressDxt(profile, content, generateMipmaps, sharpAlpha);
break;
case TextureProcessorOutputFormat.Etc1Compressed:
CompressEtc1(content, generateMipmaps);
break;
case TextureProcessorOutputFormat.PvrCompressed:
CompressPvrtc(content, generateMipmaps);
break;
}
}
static void Compress(Type targetType, TextureContent content, bool generateMipMaps)
{
var wh = new object[2];
if (generateMipMaps)
{
for (int i = 0; i < content.Faces.Count; ++i)
{
// Only generate mipmaps if there are none already
if (content.Faces[i].Count == 1)
{
var src = content.Faces[i][0];
var w = src.Width;
var h = src.Height;
content.Faces[i].Clear();
wh[0] = w;
wh[1] = h;
var dest = (BitmapContent)Activator.CreateInstance(targetType, wh);
BitmapContent.Copy(src, dest);
content.Faces[i].Add(dest);
while (w > 1 && h > 1)
{
if (w > 1)
w = w >> 1;
if (h > 1)
h = h >> 1;
wh[0] = w;
wh[1] = h;
dest = (BitmapContent)Activator.CreateInstance(targetType, wh);
BitmapContent.Copy(src, dest);
content.Faces[i].Add(dest);
}
}
else
{
// Convert the existing mipmaps
var chain = content.Faces[i];
for (int j = 0; j < chain.Count; ++j)
{
var src = chain[j];
wh[0] = src.Width;
wh[1] = src.Height;
var dest = (BitmapContent)Activator.CreateInstance(targetType, wh);
BitmapContent.Copy(src, dest);
chain[j] = dest;
}
}
}
}
else
{
// Converts all existing faces and mipmaps
content.ConvertBitmapType(targetType);
}
}