//
// Copyright 2021 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
// CLBuffer.h: Defines the cl::Buffer class, which is a collection of elements.

#ifndef LIBANGLE_CLBUFFER_H_
#define LIBANGLE_CLBUFFER_H_

#include "libANGLE/CLMemory.h"
#include "libANGLE/cl_utils.h"

namespace cl
{

class Buffer final : public Memory
{
  public:
    // Front end entry functions, only called from OpenCL entry points

    static bool IsValid(const _cl_mem *buffer);

    cl_mem createSubBuffer(MemFlags flags,
                           cl_buffer_create_type createType,
                           const void *createInfo);

    bool isRegionValid(size_t offset, size_t size) const;
    bool isRegionValid(const cl_buffer_region &region) const;

  public:
    ~Buffer() override;

    MemObjectType getType() const final;

    bool isSubBuffer() const;
    static Buffer *Cast(cl_mem memobj);

  private:
    Buffer(Context &context, PropArray &&properties, MemFlags flags, size_t size, void *hostPtr);

    Buffer(Buffer &parent, MemFlags flags, size_t offset, size_t size);

    friend class Object;
};

inline bool Buffer::IsValid(const _cl_mem *buffer)
{
    return Memory::IsValid(buffer) && buffer->cast<Memory>().getType() == MemObjectType::Buffer;
}

inline bool Buffer::isRegionValid(size_t offset, size_t size) const
{
    return offset < mSize && offset + size <= mSize;
}

inline bool Buffer::isRegionValid(const cl_buffer_region &region) const
{
    return region.origin < mSize && region.origin + region.size <= mSize;
}

inline MemObjectType Buffer::getType() const
{
    return MemObjectType::Buffer;
}

inline bool Buffer::isSubBuffer() const
{
    return mParent != nullptr;
}

inline Buffer *Buffer::Cast(cl_mem memobj)
{
    ASSERT(cl::IsBufferType(Memory::Cast(memobj)->getType()));
    return static_cast<Buffer *>(memobj);
}

}  // namespace cl

#endif  // LIBANGLE_CLBUFFER_H_