//on xbox 360 these texture formats must have dimensions that are multiples of these values.
//if the bitmap dimensions are not multiples they are rounded up and cropped when displayed.
private static int GetTileSize(KnownTextureFormat format)
{
switch (format)
{
case KnownTextureFormat.A8:
case KnownTextureFormat.Y8:
case KnownTextureFormat.AY8:
case KnownTextureFormat.A8Y8:
case KnownTextureFormat.A8R8G8B8:
case KnownTextureFormat.X8R8G8B8:
case KnownTextureFormat.A4R4G4B4:
case KnownTextureFormat.R5G6B5:
case KnownTextureFormat.U8V8:
return(32);
case KnownTextureFormat.DXT5a_mono:
case KnownTextureFormat.DXT5a_alpha:
case KnownTextureFormat.DXT1:
case KnownTextureFormat.CTX1:
case KnownTextureFormat.DXT5a:
case KnownTextureFormat.DXT3a_alpha:
case KnownTextureFormat.DXT3a_mono:
case KnownTextureFormat.DXT3:
case KnownTextureFormat.DXT5:
case KnownTextureFormat.DXN:
case KnownTextureFormat.DXN_mono_alpha:
return(128);
default: return(1);
}
}
//the size in bytes of each compressed block
private static int GetLinearTexelPitch(KnownTextureFormat format)
{
switch (format)
{
case KnownTextureFormat.DXT5a_mono:
case KnownTextureFormat.DXT5a_alpha:
case KnownTextureFormat.DXT1:
case KnownTextureFormat.CTX1:
case KnownTextureFormat.DXT5a:
case KnownTextureFormat.DXT3a_alpha:
case KnownTextureFormat.DXT3a_mono:
return(8);
case KnownTextureFormat.DXT3:
case KnownTextureFormat.DXT5:
case KnownTextureFormat.DXN:
case KnownTextureFormat.DXN_mono_alpha:
return(16);
case KnownTextureFormat.A8:
case KnownTextureFormat.AY8:
case KnownTextureFormat.P8:
case KnownTextureFormat.P8_bump:
case KnownTextureFormat.Y8:
return(1);
case KnownTextureFormat.A8R8G8B8:
case KnownTextureFormat.X8R8G8B8:
return(4);
default: return(2);
}
}
//the size in bytes of each read/write unit
//ie 32bit uses ints, DXT uses shorts etc. Used for endian swaps.
private static int GetLinearUnitSize(KnownTextureFormat format)
{
switch (format)
{
case KnownTextureFormat.A8R8G8B8:
case KnownTextureFormat.X8R8G8B8:
return(4);
case KnownTextureFormat.A8:
case KnownTextureFormat.Y8:
case KnownTextureFormat.AY8:
case KnownTextureFormat.P8_bump:
return(1);
default: return(2);
}
}
//the width and height in pixels of each compressed block
private static int GetLinearBlockSize(KnownTextureFormat format)
{
switch (format)
{
case KnownTextureFormat.DXT5a_mono:
case KnownTextureFormat.DXT5a_alpha:
case KnownTextureFormat.DXT1:
case KnownTextureFormat.CTX1:
case KnownTextureFormat.DXT5a:
case KnownTextureFormat.DXT3a_alpha:
case KnownTextureFormat.DXT3a_mono:
case KnownTextureFormat.DXT3:
case KnownTextureFormat.DXT5:
case KnownTextureFormat.DXN:
case KnownTextureFormat.DXN_mono_alpha:
return(4);
default: return(1);
}
}
//number of bits used to store each pixel
private static int GetBpp(KnownTextureFormat format)
{
switch (format)
{
case KnownTextureFormat.A8R8G8B8:
case KnownTextureFormat.X8R8G8B8:
case KnownTextureFormat.ARGBFP32:
case KnownTextureFormat.RGBFP32:
return(32);
case KnownTextureFormat.A8:
case KnownTextureFormat.Y8:
case KnownTextureFormat.AY8:
case KnownTextureFormat.P8_bump:
return(8);
case KnownTextureFormat.CTX1:
case KnownTextureFormat.DXT1:
case KnownTextureFormat.DXT3a_alpha:
case KnownTextureFormat.DXT3a_mono:
case KnownTextureFormat.DXT5a:
case KnownTextureFormat.DXT5a_alpha:
case KnownTextureFormat.DXT5a_mono:
case KnownTextureFormat.BC4_unorm:
return(4);
case KnownTextureFormat.DXT3:
case KnownTextureFormat.DXT5:
case KnownTextureFormat.DXN:
case KnownTextureFormat.DXN_mono_alpha:
case KnownTextureFormat.BC7_unorm:
return(8);
default: return(16);
}
}
