impeller::SamplerLibraryMTL Class Reference

#include <sampler_library_mtl.h>

Inheritance diagram for impeller::SamplerLibraryMTL:

Public Member Functions
	~SamplerLibraryMTL () override
Public Member Functions inherited from impeller::SamplerLibrary
virtual	~SamplerLibrary ()

Private Member Functions
const std::unique_ptr< const Sampler > &	GetSampler (SamplerDescriptor descriptor) override
	Retrieve a backend specific sampler object for the given sampler descriptor.

Friends
class	ContextMTL

Additional Inherited Members
Static Public Member Functions inherited from impeller::BackendCast< SamplerLibraryMTL, SamplerLibrary >
static SamplerLibraryMTL &	Cast (SamplerLibrary &base)
static const SamplerLibraryMTL &	Cast (const SamplerLibrary &base)
static SamplerLibraryMTL *	Cast (SamplerLibrary *base)
static const SamplerLibraryMTL *	Cast (const SamplerLibrary *base)
Protected Member Functions inherited from impeller::SamplerLibrary
	SamplerLibrary ()

Detailed Description

Definition at line 20 of file sampler_library_mtl.h.

Constructor & Destructor Documentation

~SamplerLibraryMTL()

impeller::SamplerLibraryMTL::~SamplerLibraryMTL ( )

overridedefault

Member Function Documentation

GetSampler()

const std::unique_ptr< const Sampler > & impeller::SamplerLibraryMTL::GetSampler ( SamplerDescriptor  descriptor )

overrideprivatevirtual

Retrieve a backend specific sampler object for the given sampler descriptor.

If the descriptor is invalid or there is a loss of rendering context, this method may return a nullptr.

The sampler library implementations must cache this sampler object and guarantee that the reference will continue to be valid throughout the lifetime of the Impeller context.

Implements impeller::SamplerLibrary.

Definition at line 18 of file sampler_library_mtl.mm.

                                  {
  auto found = samplers_.find(descriptor);
  if (found != samplers_.end()) {
    return found->second;
  }
  if (!device_) {
    return kNullSampler;
  }
  auto desc = [[MTLSamplerDescriptor alloc] init];
  desc.minFilter = ToMTLSamplerMinMagFilter(descriptor.min_filter);
  desc.magFilter = ToMTLSamplerMinMagFilter(descriptor.mag_filter);
  desc.mipFilter = ToMTLSamplerMipFilter(descriptor.mip_filter);
  desc.sAddressMode = ToMTLSamplerAddressMode(descriptor.width_address_mode);
  desc.tAddressMode = ToMTLSamplerAddressMode(descriptor.height_address_mode);
  desc.rAddressMode = ToMTLSamplerAddressMode(descriptor.depth_address_mode);
  if (@available(iOS 14.0, macos 10.12, *)) {
    desc.borderColor = MTLSamplerBorderColorTransparentBlack;
  }
  if (!descriptor.label.empty()) {
    desc.label = @(descriptor.label.c_str());
  }
 
  auto mtl_sampler = [device_ newSamplerStateWithDescriptor:desc];
  if (!mtl_sampler) {
    return kNullSampler;
  }
  auto sampler =
      std::unique_ptr<SamplerMTL>(new SamplerMTL(descriptor, mtl_sampler));
 
  return (samplers_[descriptor] = std::move(sampler));
}

Friends And Related Symbol Documentation

ContextMTL

friend class ContextMTL

friend

Definition at line 28 of file sampler_library_mtl.h.

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The documentation for this class was generated from the following files:

• impeller/renderer/backend/metal/sampler_library_mtl.h
• impeller/renderer/backend/metal/sampler_library_mtl.mm