Refactor how Gr handles vertex and index data. GrGpu and GrInOrderDrawBuffer both GrBufferAllocPool to manage reserved and set-to-array vertex and index data.
rietveld issue 4188049
git-svn-id: http://skia.googlecode.com/svn/trunk@786 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gpu/include/GrGeometryBuffer.h b/gpu/include/GrGeometryBuffer.h
new file mode 100644
index 0000000..fc3e358
--- /dev/null
+++ b/gpu/include/GrGeometryBuffer.h
@@ -0,0 +1,116 @@
+/*
+ Copyright 2011 Google Inc.
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+ */
+
+#ifndef GrGeometryBuffer_DEFINED
+#define GrGeometryBuffer_DEFINED
+
+#include "GrRefCnt.h"
+
+/**
+ * Parent class for vertex and index buffers
+ */
+class GrGeometryBuffer : public GrRefCnt {
+public:
+ virtual ~GrGeometryBuffer() {}
+
+ /**
+ * Retrieves the size of the buffer
+ *
+ * @return the size of the buffer in bytes
+ */
+ size_t size() { return fSizeInBytes; }
+
+ /**
+ *Retrieves whether the buffer was created with the dynamic flag
+ *
+ * @return true if the buffer was created with the dynamic flag
+ */
+ bool dynamic() const { return fDynamic; }
+
+ /**
+ * Indicates that GPU context in which this veretx buffer was created is
+ * destroyed and that Ganesh should not attempt to free the buffer in the
+ * underlying API.
+ */
+ virtual void abandon() = 0;
+
+ /**
+ * Locks the buffer to be written by the CPU.
+ *
+ * The previous content of the buffer is invalidated. It is an error
+ * to draw from the buffer while it is locked. It is an error to call lock
+ * on an already locked buffer.
+ *
+ * @return a pointer to the data or NULL if the lock fails.
+ */
+ virtual void* lock() = 0;
+
+ /**
+ * Returns the same ptr that lock() returned at time of lock or NULL if the
+ * is not locked.
+ *
+ * @return ptr to locked buffer data or undefined if buffer is not locked.
+ */
+ virtual void* lockPtr() const = 0;
+
+ /**
+ * Unlocks the buffer.
+ *
+ * The pointer returned by the previous lock call will no longer be valid.
+ */
+ virtual void unlock() = 0;
+
+ /**
+ Queries whether the buffer has been locked.
+
+ @return true if the buffer is locked, false otherwise.
+ */
+ virtual bool isLocked() const = 0;
+
+ /**
+ * Updates the buffer data.
+ *
+ * The size of the buffer will be preserved. The src data will be
+ * placed at the begining of the buffer and any remaining contents will
+ * be undefined.
+ *
+ * @return returns true if the update succeeds, false otherwise.
+ */
+ virtual bool updateData(const void* src, size_t srcSizeInBytes) = 0;
+
+ /**
+ * Updates a portion of the buffer data.
+ *
+ * The contents of the buffer outside the update region are preserved.
+ *
+ * @return returns true if the update succeeds, false otherwise.
+ */
+ virtual bool updateSubData(const void* src,
+ size_t srcSizeInBytes,
+ size_t offset) = 0;
+protected:
+ GrGeometryBuffer(size_t sizeInBytes, bool dynamic) :
+ fSizeInBytes(sizeInBytes),
+ fDynamic(dynamic) {}
+
+private:
+ size_t fSizeInBytes;
+ bool fDynamic;
+
+ typedef GrRefCnt INHERITED;
+};
+
+#endif