Revert of Add vulkan files into skia repo.

src/gpu/vk/GrVkResource.h

-/*
- * Copyright 2015 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-#ifndef GrVkResource_DEFINED
-#define GrVkResource_DEFINED
-
-#include "SkAtomics.h"
-#include "SkTDynamicHash.h"
-#include "SkRandom.h"
-
-class GrVkGpu;
-
-// uncomment to enable tracing of resource refs
-//#ifdef SK_DEBUG
-//#define SK_TRACE_VK_RESOURCES
-//#endif
-
-/** \class GrVkResource
-
-  GrVkResource is the base class for Vulkan resources that may be shared by multiple
-  objects. When an existing owner wants to share a reference, it calls ref().
-  When an owner wants to release its reference, it calls unref(). When the
-  shared object's reference count goes to zero as the result of an unref()
-  call, its (virtual) destructor is called. It is an error for the
-  destructor to be called explicitly (or via the object going out of scope on
-  the stack or calling delete) if getRefCnt() > 1.
-
-  This is nearly identical to SkRefCntBase. The exceptions are that unref()
-  takes a GrVkGpu, and any derived classes must implement freeGPUData() and
-  possibly abandonSubResources().
-*/
-
-class GrVkResource : SkNoncopyable {
-public:
-    // Simple refCount tracing, to ensure that everything ref'ed is unref'ed.
-#ifdef SK_TRACE_VK_RESOURCES
-    static const uint32_t& GetKey(const GrVkResource& r) { return r.fKey; }
-    static uint32_t Hash(const uint32_t& k) { return k; }
-    static SkTDynamicHash<GrVkResource, uint32_t> fTrace;
-    static SkRandom fRandom;
-#endif
-
-    /** Default construct, initializing the reference count to 1.
-     */
-    GrVkResource() : fRefCnt(1) {
-#ifdef SK_TRACE_VK_RESOURCES
-        fKey = fRandom.nextU();
-        fTrace.add(this);
-#endif
-    }
-
-    /** Destruct, asserting that the reference count is 1.
-     */
-    virtual ~GrVkResource() {
-#ifdef SK_DEBUG
-        SkASSERTF(fRefCnt == 1, "fRefCnt was %d", fRefCnt);
-        fRefCnt = 0;    // illegal value, to catch us if we reuse after delete
-#endif
-    }
-
-#ifdef SK_DEBUG
-    /** Return the reference count. Use only for debugging. */
-    int32_t getRefCnt() const { return fRefCnt; }
-#endif
-
-    /** May return true if the caller is the only owner.
-     *  Ensures that all previous owner's actions are complete.
-     */
-    bool unique() const {
-        if (1 == sk_atomic_load(&fRefCnt, sk_memory_order_acquire)) {
-            // The acquire barrier is only really needed if we return true.  It
-            // prevents code conditioned on the result of unique() from running
-            // until previous owners are all totally done calling unref().
-            return true;
-        }
-        return false;
-    }
-
-    /** Increment the reference count. 
-        Must be balanced by a call to unref() or unrefAndFreeResources().
-     */
-    void ref() const {
-        SkASSERT(fRefCnt > 0);
-        (void)sk_atomic_fetch_add(&fRefCnt, +1, sk_memory_order_relaxed);  // No barrier required.
-    }
-
-    /** Decrement the reference count. If the reference count is 1 before the
-        decrement, then delete the object. Note that if this is the case, then
-        the object needs to have been allocated via new, and not on the stack.
-        Any GPU data associated with this resource will be freed before it's deleted.
-     */
-    void unref(const GrVkGpu* gpu) const {
-        SkASSERT(fRefCnt > 0);
-        SkASSERT(gpu);
-        // A release here acts in place of all releases we "should" have been doing in ref().
-        if (1 == sk_atomic_fetch_add(&fRefCnt, -1, sk_memory_order_acq_rel)) {
-            // Like unique(), the acquire is only needed on success, to make sure
-            // code in internal_dispose() doesn't happen before the decrement.
-            this->internal_dispose(gpu);
-        }
-    }
-
-    /** Unref without freeing GPU data. Used only when we're abandoning the resource */
-    void unrefAndAbandon() const {
-        SkASSERT(fRefCnt > 0);
-        // A release here acts in place of all releases we "should" have been doing in ref().
-        if (1 == sk_atomic_fetch_add(&fRefCnt, -1, sk_memory_order_acq_rel)) {
-            // Like unique(), the acquire is only needed on success, to make sure
-            // code in internal_dispose() doesn't happen before the decrement.
-            this->internal_dispose();
-        }
-    }
-
-#ifdef SK_DEBUG
-    void validate() const {
-        SkASSERT(fRefCnt > 0);
-    }
-#endif
-
-private:
-    /** Must be implemented by any subclasses. 
-     *  Deletes any Vk data associated with this resource 
-     */
-    virtual void freeGPUData(const GrVkGpu* gpu) const = 0;
-
-    /** Must be overridden by subclasses that themselves store GrVkResources. 
-     *  Will unrefAndAbandon those resources without deleting the underlying Vk data 
-     */
-    virtual void abandonSubResources() const {}
-
-    /**
-     *  Called when the ref count goes to 0. Will free Vk resources.
-     */
-    void internal_dispose(const GrVkGpu* gpu) const {
-        this->freeGPUData(gpu);
-#ifdef SK_TRACE_VK_RESOURCES
-        fTrace.remove(GetKey(*this));
-#endif
-        SkASSERT(0 == fRefCnt);
-        fRefCnt = 1;
-        delete this;
-    }
-
-    /**
-     *  Internal_dispose without freeing Vk resources. Used when we've lost context.
-     */
-    void internal_dispose() const {
-        this->abandonSubResources();
-#ifdef SK_TRACE_VK_RESOURCES
-        fTrace.remove(GetKey(*this));
-#endif
-        SkASSERT(0 == fRefCnt);
-        fRefCnt = 1;
-        delete this;
-    }
-
-    mutable int32_t fRefCnt;
-#ifdef SK_TRACE_VK_RESOURCES
-    uint32_t fKey;
-#endif
-
-    typedef SkNoncopyable INHERITED;
-};
-
-
-#endif