GrMtlSampler.h

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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/SkChecksum.h"
#include "src/gpu/ganesh/GrManagedResource.h"
#include <atomic>
 
class GrSamplerState;
class GrMtlGpu;
 
// A wrapper for a MTLSamplerState object with caching support.
class GrMtlSampler : public GrManagedResource {
public:
    static GrMtlSampler* Create(const GrMtlGpu* gpu, GrSamplerState);
    ~GrMtlSampler() override { fMtlSamplerState = nil; }
 
    id<MTLSamplerState> mtlSampler() const { return fMtlSamplerState; }
 
    typedef uint32_t Key;
 
    // Helpers for hashing GrMtlSampler
    static Key GenerateKey(GrSamplerState);
 
    static const Key& GetKey(const GrMtlSampler& sampler) { return sampler.fKey; }
    static uint32_t Hash(const Key& key) {
        return SkChecksum::Hash32(&key, sizeof(Key));
    }
 
#ifdef SK_TRACE_MANAGED_RESOURCES
    /** output a human-readable dump of this resource's information
     */
    void dumpInfo() const override {
        SkDebugf("GrMtlSampler: %p (%ld refs)\n", fMtlSamplerState,
                 CFGetRetainCount((CFTypeRef)fMtlSamplerState));
    }
#endif
 
    void freeGPUData() const override {
        fMtlSamplerState = nil;
    }
 
private:
    GrMtlSampler(id<MTLSamplerState> mtlSamplerState, Key key)
        : fMtlSamplerState(mtlSamplerState)
        , fKey(key) {}
 
    mutable id<MTLSamplerState> fMtlSamplerState;
    Key                 fKey;
};
 
#endif