1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/skia/trunk/src/gpu/gl/debug/GrFakeRefObj.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,94 @@
1.4 +/*
1.5 + * Copyright 2012 Google Inc.
1.6 + *
1.7 + * Use of this source code is governed by a BSD-style license that can be
1.8 + * found in the LICENSE file.
1.9 + */
1.10 +
1.11 +#ifndef GrFakeRefObj_DEFINED
1.12 +#define GrFakeRefObj_DEFINED
1.13 +
1.14 +#include "SkTypes.h"
1.15 +#include "gl/GrGLInterface.h"
1.16 +
1.17 +////////////////////////////////////////////////////////////////////////////////
1.18 +// This object is used to track the OpenGL objects. We don't use real
1.19 +// reference counting (i.e., we don't free the objects when their ref count
1.20 +// goes to 0) so that we can detect invalid memory accesses. The refs we
1.21 +// are tracking in this class are actually OpenGL's references to the objects
1.22 +// not "ours"
1.23 +// Each object also gets a unique globally identifying ID
1.24 +class GrFakeRefObj : public SkNoncopyable {
1.25 +public:
1.26 + GrFakeRefObj()
1.27 + : fRef(0)
1.28 + , fHighRefCount(0)
1.29 + , fMarkedForDeletion(false)
1.30 + , fDeleted(false) {
1.31 +
1.32 + // source for globally unique IDs - 0 is reserved!
1.33 + static int fNextID = 0;
1.34 +
1.35 + fID = ++fNextID;
1.36 + }
1.37 + virtual ~GrFakeRefObj() {};
1.38 +
1.39 + void ref() {
1.40 + fRef++;
1.41 + if (fHighRefCount < fRef) {
1.42 + fHighRefCount = fRef;
1.43 + }
1.44 + }
1.45 + void unref() {
1.46 + fRef--;
1.47 + GrAlwaysAssert(fRef >= 0);
1.48 +
1.49 + // often in OpenGL a given object may still be in use when the
1.50 + // delete call is made. In these cases the object is marked
1.51 + // for deletion and then freed when it is no longer in use
1.52 + if (0 == fRef && fMarkedForDeletion) {
1.53 + this->deleteAction();
1.54 + }
1.55 + }
1.56 + int getRefCount() const { return fRef; }
1.57 + int getHighRefCount() const { return fHighRefCount; }
1.58 +
1.59 + GrGLuint getID() const { return fID; }
1.60 +
1.61 + void setMarkedForDeletion() { fMarkedForDeletion = true; }
1.62 + bool getMarkedForDeletion() const { return fMarkedForDeletion; }
1.63 +
1.64 + bool getDeleted() const { return fDeleted; }
1.65 +
1.66 + // The deleteAction fires if the object has been marked for deletion but
1.67 + // couldn't be deleted earlier due to refs
1.68 + virtual void deleteAction() {
1.69 + this->setDeleted();
1.70 + }
1.71 +
1.72 +protected:
1.73 +private:
1.74 + int fRef; // ref count
1.75 + int fHighRefCount; // high water mark of the ref count
1.76 + GrGLuint fID; // globally unique ID
1.77 + bool fMarkedForDeletion;
1.78 + // The deleted flag is only set when OpenGL thinks the object is deleted
1.79 + // It is obviously still allocated w/in this framework
1.80 + bool fDeleted;
1.81 +
1.82 + // setDeleted should only ever appear in the deleteAction method!
1.83 + void setDeleted() { fDeleted = true; }
1.84 +};
1.85 +
1.86 +////////////////////////////////////////////////////////////////////////////////
1.87 +// Each class derived from GrFakeRefObj should use this macro to add a
1.88 +// factory creation entry point. This entry point is used by the GrGLDebug
1.89 +// object to instantiate the various objects
1.90 +// all globally unique IDs
1.91 +#define GR_DEFINE_CREATOR(className) \
1.92 + public: \
1.93 + static GrFakeRefObj *create ## className() { \
1.94 + return SkNEW(className); \
1.95 + }
1.96 +
1.97 +#endif // GrFakeRefObj_DEFINED
