Add UniqueID to GrDrawTargetCaps.

src/gpu/GrDrawTargetCaps.h

 
 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #ifndef GrDrawTargetCaps_DEFINED
 #define GrDrawTargetCaps_DEFINED
 
 #include "GrTypes.h"
 #include "SkRefCnt.h"
 #include "SkString.h"
 
 /**
  * Represents the draw target capabilities.
  */
 class GrDrawTargetCaps : public SkRefCnt {
 public:
     SK_DECLARE_INST_COUNT(GrDrawTargetCaps)
 
-    GrDrawTargetCaps() { this->reset(); }
-    GrDrawTargetCaps(const GrDrawTargetCaps& other) : INHERITED() { *this = other; }
+    GrDrawTargetCaps() : fUniqueID(CreateUniqueID()) {
+        this->reset();
+    }
+    GrDrawTargetCaps(const GrDrawTargetCaps& other) : INHERITED(), fUniqueID(CreateUniqueID()) {
+        *this = other;
+    }
     GrDrawTargetCaps& operator= (const GrDrawTargetCaps&);
 
     virtual void reset();
     virtual SkString dump() const;
 
     bool npotTextureTileSupport() const { return fNPOTTextureTileSupport; }
     /** To avoid as-yet-unnecessary complexity we don't allow any partial support of MIP Maps (e.g.
         only for POT textures) */
     bool mipMapSupport() const { return fMipMapSupport; }
     bool twoSidedStencilSupport() const { return fTwoSidedStencilSupport; }
@@ skipping 36 matching lines @@
     bool isConfigRenderable(GrPixelConfig config, bool withMSAA) const {
         SkASSERT(kGrPixelConfigCnt > config);
         return fConfigRenderSupport[config][withMSAA];
     }
 
     bool isConfigTexturable(GrPixelConfig config) const {
         SkASSERT(kGrPixelConfigCnt > config);
         return fConfigTextureSupport[config];
     }
 
+    /**
+     * Gets an id that is unique for this GrDrawTargetCaps object. It is static in that it does
+     * not change when the content of the GrDrawTargetCaps object changes. This will never return
+     * 0.
+     */
+    uint32_t getUniqueID() const { return fUniqueID; }
+
 protected:
     bool fNPOTTextureTileSupport    : 1;
     bool fMipMapSupport             : 1;
     bool fTwoSidedStencilSupport    : 1;
     bool fStencilWrapOpsSupport     : 1;
     bool fHWAALineSupport           : 1;
     bool fShaderDerivativeSupport   : 1;
     bool fGeometryShaderSupport     : 1;
     bool fDualSourceBlendingSupport : 1;
     bool fPathRenderingSupport      : 1;
     bool fDstReadInShaderSupport    : 1;
     bool fDiscardRenderTargetSupport: 1;
     bool fReuseScratchTextures      : 1;
     bool fGpuTracingSupport         : 1;
     bool fCompressedTexSubImageSupport : 1;
 
     uint32_t fMapBufferFlags;
 
     int fMaxRenderTargetSize;
     int fMaxTextureSize;
     int fMaxSampleCount;
 
     // The first entry for each config is without msaa and the second is with.
     bool fConfigRenderSupport[kGrPixelConfigCnt][2];
     bool fConfigTextureSupport[kGrPixelConfigCnt];
 
+private:
+    static uint32_t CreateUniqueID();
+
+    const uint32_t          fUniqueID;
+
     typedef SkRefCnt INHERITED;
 };
 
 #endif