Revert of Consolidate GPU buffer implementations

src/gpu/GrGeometryBuffer.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 GrGeometryBuffer_DEFINED
+#define GrGeometryBuffer_DEFINED
+
+#include "GrGpuResource.h"
+
+class GrGpu;
+
+/**
+ * Parent class for vertex and index buffers
+ */
+class GrGeometryBuffer : public GrGpuResource {
+public:
+    
+
+    /**
+     *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; }
+
+    /**
+     * Returns true if the buffer is a wrapper around a CPU array. If true it
+     * indicates that map will always succeed and will be free.
+     */
+    bool isCPUBacked() const { return fCPUBacked; }
+
+    /**
+     * Maps 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 mapped. It is an error to call map
+     * on an already mapped buffer. It may fail if the backend doesn't support
+     * mapping the buffer. If the buffer is CPU backed then it will always
+     * succeed and is a free operation. Must be matched by an unmap() call.
+     * Currently only one map at a time is supported (no nesting of
+     * map/unmap).
+     *
+     * Note that buffer mapping does not go through GrContext and therefore is
+     * not serialized with other operations.
+     *
+     * @return a pointer to the data or nullptr if the map fails.
+     */
+     void* map() { return (fMapPtr = this->onMap()); }
+
+    /**
+     * Unmaps the buffer.
+     *
+     * The pointer returned by the previous map call will no longer be valid.
+     */
+     void unmap() {
+         SkASSERT(fMapPtr);
+         this->onUnmap();
+         fMapPtr = nullptr;
+     }
+
+    /**
+     * Returns the same ptr that map() returned at time of map or nullptr if the
+     * is not mapped.
+     *
+     * @return ptr to mapped buffer data or nullptr if buffer is not mapped.
+     */
+     void* mapPtr() const { return fMapPtr; }
+
+    /**
+     Queries whether the buffer has been mapped.
+
+     @return true if the buffer is mapped, false otherwise.
+     */
+     bool isMapped() const { return SkToBool(fMapPtr); }
+
+    /**
+     * Updates the buffer data.
+     *
+     * The size of the buffer will be preserved. The src data will be
+     * placed at the beginning of the buffer and any remaining contents will
+     * be undefined. srcSizeInBytes must be <= to the buffer size.
+     *
+     * The buffer must not be mapped.
+     *
+     * Note that buffer updates do not go through GrContext and therefore are
+     * not serialized with other operations.
+     *
+     * @return returns true if the update succeeds, false otherwise.
+     */
+    bool updateData(const void* src, size_t srcSizeInBytes) {
+        SkASSERT(!this->isMapped());
+        SkASSERT(srcSizeInBytes <= fGpuMemorySize);
+        return this->onUpdateData(src, srcSizeInBytes);
+    }
+
+protected:
+    GrGeometryBuffer(GrGpu* gpu, size_t gpuMemorySize, bool dynamic, bool cpuBacked)
+        : INHERITED(gpu, kCached_LifeCycle)
+        , fMapPtr(nullptr)
+        , fGpuMemorySize(gpuMemorySize)
+        , fDynamic(dynamic)
+        , fCPUBacked(cpuBacked) {}
+
+private:
+    virtual size_t onGpuMemorySize() const { return fGpuMemorySize; }
+
+    virtual void* onMap() = 0;
+    virtual void onUnmap() = 0;
+    virtual bool onUpdateData(const void* src, size_t srcSizeInBytes) = 0;
+
+    void*    fMapPtr;
+    size_t   fGpuMemorySize;
+    bool     fDynamic;
+    bool     fCPUBacked;
+
+    typedef GrGpuResource INHERITED;
+};
+
+#endif