Consolidate GPU buffer implementations

include/gpu/GrTypesPriv.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 GrTypesPriv_DEFINED
 #define GrTypesPriv_DEFINED
 
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     bool enabled() const { return fEnabled; }
     const SkIRect& rect() const { return fRect; }
 
 private:
     bool    fEnabled;
     SkIRect fRect;
 };
 
 /**
- * Indicates the transfer direction for a transfer buffer
- */
-enum TransferType {
-    /** Caller intends to use the buffer to transfer data to the GPU */
-    kCpuToGpu_TransferType,
-    /** Caller intends to use the buffer to transfer data from the GPU */
-    kGpuToCpu_TransferType
+* Indicates the type of data that a GPU buffer will be used for.
+*/
+enum GrBufferType {
+    kVertex_GrBufferType,
+    kIndex_GrBufferType,
+    kXferCpuToGpu_GrBufferType,
+    kXferGpuToCpu_GrBufferType,
+
+    kLast_GrBufferType = kXferGpuToCpu_GrBufferType
+};
+
+/**
+* Provides a performance hint regarding the frequency at which a data store will be accessed.
+*/
+enum GrAccessPattern {
+    /** Data store will be respecified repeatedly and used many times. */
+    kDynamic_GrAccessPattern,
+    /** Data store will be specified once and used many times. (Thus disqualified from caching.) */
+    kStatic_GrAccessPattern,
+    /** Data store will be specified once and used at most a few times. (Also can't be cached.) */
+    kStream_GrAccessPattern,
+
+    kLast_GrAccessPattern = kStream_GrAccessPattern
 };
 
 
 #ifdef SK_DEBUG
 // Takes a pointer to a GrCaps, and will suppress prints if required
 #define GrCapsDebugf(caps, ...)         \
     if (!caps->suppressPrints()) {      \
         SkDebugf(__VA_ARGS__);          \
     }
 #else
 #define GrCapsDebugf(caps, ...)
 #endif
 
 #endif