/// <summary>
/// Gets the sampler with the given ID.
/// </summary>
/// <param name="id">ID of the sampler. This is effectively a zero-based index</param>
/// <returns>The sampler with the given ID</returns>
public override Sampler Get(int id)
{
if ((uint)id >= Items.Length)
{
return(null);
}
if (_sequenceNumber != Context.SequenceNumber)
{
_sequenceNumber = Context.SequenceNumber;
SynchronizeMemory();
}
Sampler sampler = Items[id];
if (sampler == null)
{
ulong address = Address + (ulong)(uint)id * DescriptorSize;
ReadOnlySpan <byte> data = Context.PhysicalMemory.GetSpan(address, DescriptorSize);
SamplerDescriptor descriptor = MemoryMarshal.Cast <byte, SamplerDescriptor>(data)[0];
sampler = new Sampler(Context, descriptor);
Items[id] = sampler;
}
return(sampler);
}
/// <summary>
/// Creates a new instance of the cached sampler.
/// </summary>
/// <param name="context">The GPU context the sampler belongs to</param>
/// <param name="descriptor">The Maxwell sampler descriptor</param>
public Sampler(GpuContext context, SamplerDescriptor descriptor)
{
MinFilter minFilter = descriptor.UnpackMinFilter();
MagFilter magFilter = descriptor.UnpackMagFilter();
bool seamlessCubemap = descriptor.UnpackSeamlessCubemap();
AddressMode addressU = descriptor.UnpackAddressU();
AddressMode addressV = descriptor.UnpackAddressV();
AddressMode addressP = descriptor.UnpackAddressP();
CompareMode compareMode = descriptor.UnpackCompareMode();
CompareOp compareOp = descriptor.UnpackCompareOp();
ColorF color = new ColorF(
descriptor.BorderColorR,
descriptor.BorderColorG,
descriptor.BorderColorB,
descriptor.BorderColorA);
float minLod = descriptor.UnpackMinLod();
float maxLod = descriptor.UnpackMaxLod();
float mipLodBias = descriptor.UnpackMipLodBias();
float maxRequestedAnisotropy = GraphicsConfig.MaxAnisotropy >= 0 && GraphicsConfig.MaxAnisotropy <= 16 ? GraphicsConfig.MaxAnisotropy : descriptor.UnpackMaxAnisotropy();
float maxSupportedAnisotropy = context.Capabilities.MaximumSupportedAnisotropy;
if (maxRequestedAnisotropy > maxSupportedAnisotropy)
{
maxRequestedAnisotropy = maxSupportedAnisotropy;
}
HostSampler = context.Renderer.CreateSampler(new SamplerCreateInfo(
minFilter,
magFilter,
seamlessCubemap,
addressU,
addressV,
addressP,
compareMode,
compareOp,
color,
minLod,
maxLod,
mipLodBias,
maxRequestedAnisotropy));
}
/// <summary>
/// Creates a new instance of the cached sampler.
/// </summary>
/// <param name="context">The GPU context the sampler belongs to</param>
/// <param name="descriptor">The Maxwell sampler descriptor</param>
public Sampler(GpuContext context, SamplerDescriptor descriptor)
{
MinFilter minFilter = descriptor.UnpackMinFilter();
MagFilter magFilter = descriptor.UnpackMagFilter();
AddressMode addressU = descriptor.UnpackAddressU();
AddressMode addressV = descriptor.UnpackAddressV();
AddressMode addressP = descriptor.UnpackAddressP();
CompareMode compareMode = descriptor.UnpackCompareMode();
CompareOp compareOp = descriptor.UnpackCompareOp();
ColorF color = new ColorF(
descriptor.BorderColorR,
descriptor.BorderColorG,
descriptor.BorderColorB,
descriptor.BorderColorA);
float minLod = descriptor.UnpackMinLod();
float maxLod = descriptor.UnpackMaxLod();
float mipLodBias = descriptor.UnpackMipLodBias();
float maxAnisotropy = descriptor.UnpackMaxAnisotropy();
HostSampler = context.Renderer.CreateSampler(new SamplerCreateInfo(
minFilter,
magFilter,
addressU,
addressV,
addressP,
compareMode,
compareOp,
color,
minLod,
maxLod,
mipLodBias,
maxAnisotropy));
}
/// <summary>
/// Check if two descriptors are equal.
/// </summary>
/// <param name="other">The descriptor to compare against</param>
/// <returns>True if they are equal, false otherwise</returns>
public bool Equals(ref SamplerDescriptor other)
{
return(Unsafe.As <SamplerDescriptor, Vector256 <byte> >(ref this).Equals(Unsafe.As <SamplerDescriptor, Vector256 <byte> >(ref other)));
}
