/// <summary>
/// Unpacks the texture minification filter.
/// This defines the filtering used when the texture covers an area on the screen
/// that is smaller than the texture size.
/// </summary>
/// <returns>The minification filter</returns>
public MinFilter UnpackMinFilter()
{
SamplerMinFilter minFilter = (SamplerMinFilter)((Word1 >> 4) & 3);
SamplerMipFilter mipFilter = (SamplerMipFilter)((Word1 >> 6) & 3);
return(ConvertFilter(minFilter, mipFilter));
}
/// <summary>
/// Converts two minification and filter enum, to a single minification enum,
/// including mipmap filtering information, as expected from the host API.
/// </summary>
/// <param name="minFilter">The minification filter</param>
/// <param name="mipFilter">The mipmap level filter</param>
/// <returns>The combined, host API compatible filter enum</returns>
private static MinFilter ConvertFilter(SamplerMinFilter minFilter, SamplerMipFilter mipFilter)
{
switch (mipFilter)
{
case SamplerMipFilter.None:
switch (minFilter)
{
case SamplerMinFilter.Nearest: return(MinFilter.Nearest);
case SamplerMinFilter.Linear: return(MinFilter.Linear);
}
break;
case SamplerMipFilter.Nearest:
switch (minFilter)
{
case SamplerMinFilter.Nearest: return(MinFilter.NearestMipmapNearest);
case SamplerMinFilter.Linear: return(MinFilter.LinearMipmapNearest);
}
break;
case SamplerMipFilter.Linear:
switch (minFilter)
{
case SamplerMinFilter.Nearest: return(MinFilter.NearestMipmapLinear);
case SamplerMinFilter.Linear: return(MinFilter.LinearMipmapLinear);
}
break;
}
return(MinFilter.Nearest);
}
/// <summary>
/// Default SamplerStateDescription values.
/// </summary>
public void SetDefault()
{
AddressModeU = SamplerAddressMode.ClampToEdge;
AddressModeV = SamplerAddressMode.ClampToEdge;
AddressModeW = SamplerAddressMode.ClampToEdge;
MagFilter = SamplerMinMagFilter.Nearest;
MinFilter = SamplerMinMagFilter.Nearest;
MipmapFilter = SamplerMipFilter.Nearest;
MaxAnisotropy = 1;
LodMinClamp = 0.0f;
LodMaxClamp = float.MaxValue;
CompareFunction = CompareFunction.Never;
BorderColor = SamplerBorderColor.TransparentBlack;
}
