Revert of Refactor GrBufferAllocPools to use resource cache

src/gpu/GrBufferAllocPool.h

 /*
  * Copyright 2010 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrBufferAllocPool_DEFINED
 #define GrBufferAllocPool_DEFINED
 
@@ skipping 46 matching lines @@
     };
 
     /**
      * Constructor
      *
      * @param gpu                   The GrGpu used to create the buffers.
      * @param bufferType            The type of buffers to create.
      * @param bufferSize            The minimum size of created buffers.
      *                              This value will be clamped to some
      *                              reasonable minimum.
+     * @param preallocBufferCnt     The pool will allocate this number of
+     *                              buffers at bufferSize and keep them until it
+     *                              is destroyed.
      */
      GrBufferAllocPool(GrGpu* gpu,
                        BufferType bufferType,
-                       size_t   bufferSize = 0);
+                       size_t   bufferSize = 0,
+                       int preallocBufferCnt = 0);
 
-     virtual ~GrBufferAllocPool();
+    virtual ~GrBufferAllocPool();
 
     /**
      * Returns a block of memory to hold data. A buffer designated to hold the
      * data is given to the caller. The buffer may or may not be locked. The
      * returned ptr remains valid until any of the following:
      *      *makeSpace is called again.
      *      *unmap is called.
      *      *reset is called.
      *      *this object is destroyed.
      *
      * Once unmap on the pool is called the data is guaranteed to be in the
      * buffer at the offset indicated by offset. Until that time it may be
      * in temporary storage and/or the buffer may be locked.
      *
      * @param size         the amount of data to make space for
      * @param alignment    alignment constraint from start of buffer
      * @param buffer       returns the buffer that will hold the data.
      * @param offset       returns the offset into buffer of the data.
      * @return pointer to where the client should write the data.
      */
     void* makeSpace(size_t size,
                     size_t alignment,
                     const GrGeometryBuffer** buffer,
                     size_t* offset);
 
-    GrGeometryBuffer* getBuffer(size_t size);
+    GrGeometryBuffer* createBuffer(size_t size);
 
 private:
     struct BufferBlock {
         size_t              fBytesFree;
         GrGeometryBuffer*   fBuffer;
     };
 
     bool createBlock(size_t requestSize);
     void destroyBlock();
-    void deleteBlocks();
     void flushCpuData(const BufferBlock& block, size_t flushSize);
 #ifdef SK_DEBUG
     void validate(bool unusedBlockAllowed = false) const;
 #endif
 
     size_t                          fBytesInUse;
 
     GrGpu*                          fGpu;
+    SkTDArray<GrGeometryBuffer*>    fPreallocBuffers;
     size_t                          fMinBlockSize;
     BufferType                      fBufferType;
 
     SkTArray<BufferBlock>           fBlocks;
+    int                             fPreallocBuffersInUse;
+    // We attempt to cycle through the preallocated buffers rather than
+    // always starting from the first.
+    int                             fPreallocBufferStartIdx;
     SkAutoMalloc                    fCpuData;
     void*                           fBufferPtr;
 };
 
 class GrVertexBuffer;
 
 /**
  * A GrBufferAllocPool of vertex buffers
  */
 class GrVertexBufferAllocPool : public GrBufferAllocPool {
 public:
     /**
      * Constructor
      *
      * @param gpu                   The GrGpu used to create the vertex buffers.
+     * @param bufferSize            The minimum size of created VBs. This value
+     *                              will be clamped to some reasonable minimum.
+     * @param preallocBufferCnt     The pool will allocate this number of VBs at
+     *                              bufferSize and keep them until it is
+     *                              destroyed.
      */
-    GrVertexBufferAllocPool(GrGpu* gpu);
+    GrVertexBufferAllocPool(GrGpu* gpu, size_t bufferSize = 0, int preallocBufferCnt = 0);
 
     /**
      * Returns a block of memory to hold vertices. A buffer designated to hold
      * the vertices given to the caller. The buffer may or may not be locked.
      * The returned ptr remains valid until any of the following:
      *      *makeSpace is called again.
      *      *unmap is called.
      *      *reset is called.
      *      *this object is destroyed.
      *
@@ skipping 22 matching lines @@
 
 /**
  * A GrBufferAllocPool of index buffers
  */
 class GrIndexBufferAllocPool : public GrBufferAllocPool {
 public:
     /**
      * Constructor
      *
      * @param gpu                   The GrGpu used to create the index buffers.
+     * @param bufferSize            The minimum size of created IBs. This value
+     *                              will be clamped to some reasonable minimum.
+     * @param preallocBufferCnt     The pool will allocate this number of VBs at
+     *                              bufferSize and keep them until it is
+     *                              destroyed.
      */
-    GrIndexBufferAllocPool(GrGpu* gpu);
+    GrIndexBufferAllocPool(GrGpu* gpu,
+                           size_t bufferSize = 0,
+                           int preallocBufferCnt = 0);
 
     /**
      * Returns a block of memory to hold indices. A buffer designated to hold
      * the indices is given to the caller. The buffer may or may not be locked.
      * The returned ptr remains valid until any of the following:
      *      *makeSpace is called again.
      *      *unmap is called.
      *      *reset is called.
      *      *this object is destroyed.
      *
      * Once unmap on the pool is called the indices are guaranteed to be in the
      * buffer at the offset indicated by startIndex. Until that time they may be
      * in temporary storage and/or the buffer may be locked.
      *
      * @param indexCount   number of indices to allocate space for
      * @param buffer       returns the index buffer that will hold the indices.
      * @param startIndex   returns the offset into buffer of the first index.
      * @return pointer to first index.
      */
     void* makeSpace(int indexCount,
                     const GrIndexBuffer** buffer,
                     int* startIndex);
 
 private:
     typedef GrBufferAllocPool INHERITED;
 };
 
 #endif