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* Copyright 2018 Google Inc.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
#ifndef GrMtlSampler_DEFINED
#define GrMtlSampler_DEFINED
#import <metal/metal.h>
#include "src/core/SkOpts.h"
#include <atomic>
class GrSamplerState;
class GrMtlGpu;
// A wrapper for a MTLSamplerState object with caching support.
class GrMtlSampler : public SkRefCnt {
static GrMtlSampler* Create(const GrMtlGpu* gpu, const GrSamplerState&, uint32_t maxMipLevel);
~GrMtlSampler() { fMtlSamplerState = nil; }
id<MTLSamplerState> mtlSampler() const { return fMtlSamplerState; }
typedef uint32_t Key;
// Helpers for hashing GrMtlSampler
static Key GenerateKey(const GrSamplerState&, uint32_t maxMipLevel);
static const Key& GetKey(const GrMtlSampler& sampler) { return sampler.fKey; }
static uint32_t Hash(const Key& key) {
return SkOpts::hash(reinterpret_cast<const uint32_t*>(&key), sizeof(Key));
GrMtlSampler(id<MTLSamplerState> mtlSamplerState, Key key)
: fMtlSamplerState(mtlSamplerState)
, fKey(key) {}
id<MTLSamplerState> fMtlSamplerState;
Key fKey;