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