private bool Initalize(PvrPixelFormat pixelFormat, PvrDataFormat dataFormat)
{
// Set the default values
HasGlobalIndex = true;
GlobalIndex = 0;
CompressionFormat = PvrCompressionFormat.NONE;
// Set the data format and pixel format and load the appropiate codecs
this.PixelFormat = pixelFormat;
PixelCodec = PvrPixelCodec.GetPixelCodec(pixelFormat);
this.DataFormat = dataFormat;
DataCodec = PvrDataCodec.GetDataCodec(dataFormat);
// Make sure the pixel and data codecs exists and we can encode to it
if (PixelCodec == null || !PixelCodec.CanEncode)
{
return(false);
}
if (DataCodec == null || !DataCodec.CanEncode)
{
return(false);
}
DataCodec.PixelCodec = PixelCodec;
if (DataCodec.PaletteEntries != 0)
{
if (DataCodec.VQ)
{
m_decodedData = BitmapToRawVQ(m_decodedBitmap, DataCodec.PaletteEntries, out m_texturePalette);
}
else
{
// Convert the bitmap to an array containing indicies.
m_decodedData = BitmapToRawIndexed(m_decodedBitmap, DataCodec.PaletteEntries, out m_texturePalette);
// If this texture has an external palette file, set up the palette encoder
if (DataCodec.NeedsExternalPalette)
{
PaletteEncoder = new PvpPaletteEncoder(m_texturePalette, (ushort)DataCodec.PaletteEntries, pixelFormat, PixelCodec);
}
}
}
else
{
// Convert the bitmap to an array
m_decodedData = BitmapToRaw(m_decodedBitmap);
}
return(true);
}
public void Initalize()
{
// Determine the offsets of the GBIX (if present) and PVRT header chunks.
if (PTMethods.Contains(m_encodedData, 0x00, gbixFourCC))
{
GbixOffset = 0x00;
PvrtOffset = 0x08 + BitConverter.ToInt32(m_encodedData, GbixOffset + 4);
}
else if (PTMethods.Contains(m_encodedData, 0x04, gbixFourCC))
{
GbixOffset = 0x04;
PvrtOffset = 0x0C + BitConverter.ToInt32(m_encodedData, GbixOffset + 4);
}
else if (PTMethods.Contains(m_encodedData, 0x04, pvrtFourCC))
{
GbixOffset = -1;
PvrtOffset = 0x04;
}
else
{
GbixOffset = -1;
PvrtOffset = 0x00;
}
// Read the global index (if it is present). If it is not present, just set it to 0.
if (GbixOffset != -1)
{
GlobalIndex = BitConverter.ToUInt32(m_encodedData, GbixOffset + 0x08);
}
else
{
GlobalIndex = 0;
}
// Read information about the texture
TextureWidth = BitConverter.ToUInt16(m_encodedData, PvrtOffset + 0x0C);
TextureHeight = BitConverter.ToUInt16(m_encodedData, PvrtOffset + 0x0E);
PixelFormat = (PvrPixelFormat)m_encodedData[PvrtOffset + 0x08];
DataFormat = (PvrDataFormat)m_encodedData[PvrtOffset + 0x09];
// Get the codecs and make sure we can decode using them
PixelCodec = PvrPixelCodec.GetPixelCodec(PixelFormat);
DataCodec = PvrDataCodec.GetDataCodec(DataFormat);
if (DataCodec != null && PixelCodec != null)
{
DataCodec.PixelCodec = PixelCodec;
}
// Set the number of palette entries
// The number in a Small Vq encoded texture various based on its size
m_paletteEntries = DataCodec.PaletteEntries;
if (DataFormat == PvrDataFormat.VECTOR_QUANTIZATION_SMALL || DataFormat == PvrDataFormat.VECTOR_QUANTIZATION_SMALL_MIPMAP)
{
if (TextureWidth <= 16)
{
m_paletteEntries = 64; // Actually 16
}
else if (TextureWidth <= 32)
{
m_paletteEntries = 256; // Actually 64
}
else if (TextureWidth <= 64)
{
m_paletteEntries = 512; // Actually 128
}
else
{
m_paletteEntries = 1024; // Actually 256
}
}
// Set the palette and data offsets
if (m_paletteEntries == 0 || DataCodec.NeedsExternalPalette)
{
m_paletteOffset = -1;
m_dataOffset = PvrtOffset + 0x10;
}
else
{
m_paletteOffset = PvrtOffset + 0x10;
m_dataOffset = m_paletteOffset + (m_paletteEntries * (PixelCodec.Bpp >> 3));
}
// Get the compression format and determine if we need to decompress this texture
CompressionFormat = GetCompressionFormat(m_encodedData, PvrtOffset, m_dataOffset);
CompressionCodec = PvrCompressionCodec.GetCompressionCodec(CompressionFormat);
if (CompressionFormat != PvrCompressionFormat.NONE && CompressionCodec != null)
{
m_encodedData = CompressionCodec.Decompress(m_encodedData, m_dataOffset, PixelCodec, DataCodec);
// Now place the offsets in the appropiate area
if (CompressionFormat == PvrCompressionFormat.RLE)
{
if (GbixOffset != -1)
{
GbixOffset -= 4;
}
PvrtOffset -= 4;
if (m_paletteOffset != -1)
{
m_paletteOffset -= 4;
}
m_dataOffset -= 4;
}
}
// If the texture contains mipmaps, gets the offsets of them
if (DataCodec.HasMipmaps)
{
m_mipmapOffsets = new int[(int)Math.Log(TextureWidth, 2) + 1];
int mipmapOffset = 0;
// Calculate the padding for the first mipmap offset
if (DataFormat == PvrDataFormat.SQUARE_TWIDDLED_MIPMAP)
{
// A 1x1 mipmap takes up as much space as a 2x1 mipmap
mipmapOffset = (DataCodec.Bpp) >> 3;
}
else if (DataFormat == PvrDataFormat.SQUARE_TWIDDLED_MIPMAP_ALT)
{
// A 1x1 mipmap takes up as much space as a 2x2 mipmap
mipmapOffset = (3 * DataCodec.Bpp) >> 3;
}
for (int i = m_mipmapOffsets.Length - 1, size = 1; i >= 0; i--, size <<= 1)
{
m_mipmapOffsets[i] = mipmapOffset;
mipmapOffset += Math.Max((size * size * DataCodec.Bpp) >> 3, 1);
}
}
}
