Revert of Improve tracking of bound FBOs in GrGLGpu.

src/gpu/gl/GrGLGpu.h

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrGLGpu_DEFINED
 #define GrGLGpu_DEFINED
 
@@ skipping 228 matching lines @@
 
     void initFSAASupport();
 
     // determines valid stencil formats
     void initStencilFormats();
 
     // sets a texture unit to use for texture operations other than binding a texture to a program.
     // ensures that such operations don't negatively interact with tracking bound textures.
     void setScratchTextureUnit();
 
-    // Binds the render target, sets the viewport, tracks dirty are for resolve, and tracks whether
-    // mip maps need rebuilding. bounds is region that may be modified by the draw. NULL means whole
-    // target. Can be an empty rect.
-    void prepareToDrawToRenderTarget(GrGLRenderTarget*, const SkIRect* bounds);
-
-    // On older GLs there may not be separate FBO bindings for draw and read. In that case these
-    // alias each other.
-    enum FBOBinding {
-        kDraw_FBOBinding, // drawing or dst of blit
-        kRead_FBOBinding, // src of blit, read pixels.
-
-        kLast_FBOBinding = kRead_FBOBinding
-    };
-    static const int kFBOBindingCnt = kLast_FBOBinding + 1;
-
-    // binds the FBO and returns the GL enum of the framebuffer target it was bound to.
-    GrGLenum bindFBO(FBOBinding, const GrGLFBO*);
-
-    void setViewport(const GrGLIRect& viewport);
+    // bounds is region that may be modified and therefore has to be resolved.
+    // NULL means whole target. Can be an empty rect.
+    void flushRenderTarget(GrGLRenderTarget*, const SkIRect* bounds);
 
     void flushStencil(const GrStencilSettings&);
     void flushHWAAState(GrRenderTarget* rt, bool useHWAA, bool isLineDraw);
 
     bool configToGLFormats(GrPixelConfig config,
                            bool getSizedInternal,
                            GrGLenum* internalFormat,
                            GrGLenum* externalFormat,
                            GrGLenum* externalType);
     // helper for onCreateTexture and writeTexturePixels
@@ skipping 12 matching lines @@
     // with new data.
     bool uploadCompressedTexData(const GrSurfaceDesc& desc,
                                  const void* data,
                                  bool isNewTexture = true,
                                  int left = 0, int top = 0,
                                  int width = -1, int height = -1);
 
     bool createRenderTargetObjects(const GrSurfaceDesc&, bool budgeted, GrGLuint texID, 
                                    GrGLRenderTarget::IDDesc*);
 
-    static const FBOBinding kInvalidFBOBinding = static_cast<FBOBinding>(-1);
+    enum TempFBOTarget {
+        kSrc_TempFBOTarget,
+        kDst_TempFBOTarget
+    };
 
-    // Binds a surface as an FBO. A temporary FBO ID may be used if the surface is not already
-    // a render target. Afterwards unbindSurfaceAsFBOForCopy must be called with the value returned.
-    FBOBinding bindSurfaceAsFBOForCopy(GrSurface*, FBOBinding, GrGLIRect* viewport);
+    GrGLuint bindSurfaceAsFBO(GrSurface* surface, GrGLenum fboTarget, GrGLIRect* viewport,
+                              TempFBOTarget tempFBOTarget);
 
-    // Must be matched with bindSurfaceAsFBOForCopy.
-    void unbindSurfaceAsFBOForCopy(FBOBinding);
+    void unbindTextureFromFBO(GrGLenum fboTarget);
 
     GrGLContext fGLContext;
 
     // GL program-related state
     ProgramCache*               fProgramCache;
     SkAutoTUnref<GrGLProgram>   fCurrentProgram;
 
     ///////////////////////////////////////////////////////////////////////////
     ///@name Caching of GL State
     ///@{
     int                         fHWActiveTextureUnitIdx;
     GrGLuint                    fHWProgramID;
 
     enum TriState {
         kNo_TriState,
         kYes_TriState,
         kUnknown_TriState
     };
 
-    SkAutoTUnref<GrGLFBO> fTempSrcFBO;
-    SkAutoTUnref<GrGLFBO> fTempDstFBO;
-    SkAutoTUnref<GrGLFBO> fStencilClearFBO;
+    GrGLuint                    fTempSrcFBOID;
+    GrGLuint                    fTempDstFBOID;
+
+    GrGLuint                    fStencilClearFBOID;
 
     // last scissor / viewport scissor state seen by the GL.
     struct {
         TriState    fEnabled;
         GrGLIRect   fRect;
         void invalidate() {
             fEnabled = kUnknown_TriState;
             fRect.invalidate();
         }
     } fHWScissorSettings;
@@ skipping 125 matching lines @@
 
     TriState fMSAAEnabled;
 
     GrStencilSettings           fHWStencilSettings;
     TriState                    fHWStencilTestEnabled;
 
 
     GrPipelineBuilder::DrawFace fHWDrawFace;
     TriState                    fHWWriteToColor;
     TriState                    fHWDitherEnabled;
+    uint32_t                    fHWBoundRenderTargetUniqueID;
     SkTArray<uint32_t, true>    fHWBoundTextureUniqueIDs;
 
-    // Track fbo binding state.
-    struct HWFBOBinding {
-        SkAutoTUnref<const GrGLFBO> fFBO;
-        void invalidate() { fFBO.reset(NULL); }
-    } fHWFBOBinding[kFBOBindingCnt];
-
     ///@}
 
     // we record what stencil format worked last time to hopefully exit early
     // from our loop that tries stencil formats and calls check fb status.
     int fLastSuccessfulStencilFmtIdx;
 
     typedef GrGpu INHERITED;
     friend class GrGLPathRendering; // For accessing setTextureUnit.
 };
 
 #endif