1 2 /* 3 * Copyright 2012 Google Inc. 4 * 5 * Use of this source code is governed by a BSD-style license that can be 6 * found in the LICENSE file. 7 */ 8 9 #ifndef GrFakeRefObj_DEFINED 10 #define GrFakeRefObj_DEFINED 11 12 #include "gl/GrGLInterface.h" 13 #include "GrNoncopyable.h" 14 15 //////////////////////////////////////////////////////////////////////////////// 16 // This object is used to track the OpenGL objects. We don't use real 17 // reference counting (i.e., we don't free the objects when their ref count 18 // goes to 0) so that we can detect invalid memory accesses. The refs we 19 // are tracking in this class are actually OpenGL's references to the objects 20 // not "ours" 21 // Each object also gets a unique globally identifying ID 22 class GrFakeRefObj : public GrNoncopyable { 23 public: GrFakeRefObj()24 GrFakeRefObj() 25 : fRef(0) 26 , fHighRefCount(0) 27 , fMarkedForDeletion(false) 28 , fDeleted(false) { 29 30 // source for globally unique IDs - 0 is reserved! 31 static int fNextID = 0; 32 33 fID = ++fNextID; 34 } ~GrFakeRefObj()35 virtual ~GrFakeRefObj() {}; 36 ref()37 void ref() { 38 fRef++; 39 if (fHighRefCount < fRef) { 40 fHighRefCount = fRef; 41 } 42 } unref()43 void unref() { 44 fRef--; 45 GrAlwaysAssert(fRef >= 0); 46 47 // often in OpenGL a given object may still be in use when the 48 // delete call is made. In these cases the object is marked 49 // for deletion and then freed when it is no longer in use 50 if (0 == fRef && fMarkedForDeletion) { 51 this->deleteAction(); 52 } 53 } getRefCount()54 int getRefCount() const { return fRef; } getHighRefCount()55 int getHighRefCount() const { return fHighRefCount; } 56 getID()57 GrGLuint getID() const { return fID; } 58 setMarkedForDeletion()59 void setMarkedForDeletion() { fMarkedForDeletion = true; } getMarkedForDeletion()60 bool getMarkedForDeletion() const { return fMarkedForDeletion; } 61 getDeleted()62 bool getDeleted() const { return fDeleted; } 63 64 // The deleteAction fires if the object has been marked for deletion but 65 // couldn't be deleted earlier due to refs deleteAction()66 virtual void deleteAction() { 67 this->setDeleted(); 68 } 69 70 protected: 71 private: 72 int fRef; // ref count 73 int fHighRefCount; // high water mark of the ref count 74 GrGLuint fID; // globally unique ID 75 bool fMarkedForDeletion; 76 // The deleted flag is only set when OpenGL thinks the object is deleted 77 // It is obviously still allocated w/in this framework 78 bool fDeleted; 79 80 // setDeleted should only ever appear in the deleteAction method! setDeleted()81 void setDeleted() { fDeleted = true; } 82 }; 83 84 //////////////////////////////////////////////////////////////////////////////// 85 // Each class derived from GrFakeRefObj should use this macro to add a 86 // factory creation entry point. This entry point is used by the GrGLDebug 87 // object to instantiate the various objects 88 // all globally unique IDs 89 #define GR_DEFINE_CREATOR(className) \ 90 public: \ 91 static GrFakeRefObj *create ## className() { \ 92 return SkNEW(className); \ 93 } 94 95 #endif // GrFakeRefObj_DEFINED 96