magnum/src/Magnum/Vk/Buffer.h

#ifndef Magnum_Vk_Buffer_h
#define Magnum_Vk_Buffer_h
/*
    This file is part of Magnum.

    Copyright © 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019,
                2020 Vladimír Vondruš <mosra@centrum.cz>

    Permission is hereby granted, free of charge, to any person obtaining a
    copy of this software and associated documentation files (the "Software"),
    to deal in the Software without restriction, including without limitation
    the rights to use, copy, modify, merge, publish, distribute, sublicense,
    and/or sell copies of the Software, and to permit persons to whom the
    Software is furnished to do so, subject to the following conditions:

    The above copyright notice and this permission notice shall be included
    in all copies or substantial portions of the Software.

    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
    THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
    FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
    DEALINGS IN THE SOFTWARE.
*/

/** @file
 * @brief Class @ref Magnum::Vk::BufferCreateInfo, @ref Magnum::Vk::Buffer, enum @ref Magnum::Vk::BufferUsage, enum set @ref Magnum::Vk::BufferUsages
 * @m_since_latest
 */

#include <Corrade/Containers/EnumSet.h>

#include "Magnum/Magnum.h"
#include "Magnum/Tags.h"
#include "Magnum/Vk/Vk.h"
#include "Magnum/Vk/Vulkan.h"
#include "Magnum/Vk/visibility.h"

namespace Magnum { namespace Vk {

/**
@brief Buffer usage
@m_since_latest

Wraps a @type_vk_keyword{BufferUsageFlagBits}.
@see @ref BufferUsages, @ref BufferCreateInfo
@m_enum_values_as_keywords
*/
enum class BufferUsage: UnsignedInt {
    TransferSource = VK_BUFFER_USAGE_TRANSFER_SRC_BIT,
    TransferDestination = VK_BUFFER_USAGE_TRANSFER_DST_BIT,
    UniformTexelBuffer = VK_BUFFER_USAGE_UNIFORM_TEXEL_BUFFER_BIT,
    StorageTexelBuffer = VK_BUFFER_USAGE_STORAGE_TEXEL_BUFFER_BIT,
    UniformBuffer = VK_BUFFER_USAGE_UNIFORM_BUFFER_BIT,
    StorageBuffer = VK_BUFFER_USAGE_STORAGE_BUFFER_BIT,
    IndexBuffer = VK_BUFFER_USAGE_INDEX_BUFFER_BIT,
    VertexBuffer = VK_BUFFER_USAGE_VERTEX_BUFFER_BIT,
    IndirectBuffer = VK_BUFFER_USAGE_INDIRECT_BUFFER_BIT,

    /** @todo VK_BUFFER_USAGE_SHADER_DEVICE_ADDRESS_BIT, 1.2 */
};

/**
@brief Buffer usages
@m_since_latest

Type-safe wrapper for @type_vk_keyword{BufferUsageFlags}.
@see @ref BufferCreateInfo
*/
typedef Containers::EnumSet<BufferUsage> BufferUsages;

CORRADE_ENUMSET_OPERATORS(BufferUsages)

/**
@brief Buffer creation info
@m_since_latest

Wraps a @type_vk_keyword{BufferCreateInfo}. See @ref Buffer for usage
information.
*/
class MAGNUM_VK_EXPORT BufferCreateInfo {
    public:
        /**
         * @brief Buffer creation flag
         *
         * Wraps @type_vk_keyword{BufferCreateFlagBits}.
         * @see @ref Flags, @ref BufferCreateInfo()
         * @m_enum_values_as_keywords
         */
        enum class Flag: UnsignedInt {
            /** @todo sparse binding, protected ... */
        };

        /**
         * @brief Buffer creation flags
         *
         * Type-safe wrapper for @type_vk_keyword{BufferCreateFlags}.
         * @see @ref BufferCreateInfo()
         */
        typedef Containers::EnumSet<Flag> Flags;

        /**
         * @brief Constructor
         * @param usages    Desired buffer usage. At least one flag is
         *      required.
         * @param size      Buffer size
         * @param flags     Buffer creation flags
         *
         * The following @type_vk{BufferCreateInfo} fields are pre-filled in
         * addition to `sType`, everything else is zero-filled:
         *
         * -    `flags`
         * -    `size`
         * -    `usage` to @p usages
         * -    `sharingMode` to @val_vk{SHARING_MODE_EXCLUSIVE,SharingMode}
         */
        explicit BufferCreateInfo(BufferUsages usages, UnsignedLong size, Flags flags = {});

        /**
         * @brief Construct without initializing the contents
         *
         * Note that not even the `sType` field is set --- the structure has to
         * be fully initialized afterwards in order to be usable.
         */
        explicit BufferCreateInfo(NoInitT) noexcept;

        /**
         * @brief Construct from existing data
         *
         * Copies the existing values verbatim, pointers are kept unchanged
         * without taking over the ownership. Modifying the newly created
         * instance will not modify the original data nor the pointed-to data.
         */
        explicit BufferCreateInfo(const VkBufferCreateInfo& info);

        /** @brief Underlying @type_vk{BufferCreateInfo} structure */
        VkBufferCreateInfo& operator*() { return _info; }
        /** @overload */
        const VkBufferCreateInfo& operator*() const { return _info; }
        /** @overload */
        VkBufferCreateInfo* operator->() { return &_info; }
        /** @overload */
        const VkBufferCreateInfo* operator->() const { return &_info; }
        /** @overload */
        operator const VkBufferCreateInfo*() const { return &_info; }

    private:
        VkBufferCreateInfo _info;
};

CORRADE_ENUMSET_OPERATORS(BufferCreateInfo::Flags)

/**
@brief Buffer
@m_since_latest

Wraps a @type_vk_keyword{Buffer}.
*/
class MAGNUM_VK_EXPORT Buffer {
    public:
        /**
         * @brief Wrap existing Vulkan handle
         * @param device    Vulkan device the buffer is created on
         * @param handle    The @type_vk{Buffer} handle
         * @param flags     Handle flags
         *
         * The @p handle is expected to be originating from @p device. Unlike
         * a buffer created using a constructor, the Vulkan buffer is by
         * default not deleted on destruction, use @p flags for different
         * behavior.
         * @see @ref release()
         */
        static Buffer wrap(Device& device, VkBuffer handle, HandleFlags flags = {});

        /**
         * @brief Construct a buffer without allocating
         * @param device    Vulkan device to create the buffer on
         * @param info      Buffer creation info
         *
         * @see @fn_vk_keyword{CreateBuffer}
         */
        explicit Buffer(Device& device, const BufferCreateInfo& info, NoAllocateT);

        /**
         * @brief Construct without creating the buffer
         *
         * The constructed instance is equivalent to moved-from state. Useful
         * in cases where you will overwrite the instance later anyway. Move
         * another object over it to make it useful.
         */
        explicit Buffer(NoCreateT);

        /** @brief Copying is not allowed */
        Buffer(const Buffer&) = delete;

        /** @brief Move constructor */
        Buffer(Buffer&& other) noexcept;

        /**
         * @brief Destructor
         *
         * Destroys associated @type_vk{Buffer} handle, unless the instance was
         * created using @ref wrap() without
         * @ref HandleFlag::DestroyOnDestruction specified.
         * @see @fn_vk_keyword{DestroyBuffer}, @ref release()
         */
        ~Buffer();

        /** @brief Copying is not allowed */
        Buffer& operator=(const Buffer&) = delete;

        /** @brief Move assignment */
        Buffer& operator=(Buffer&& other) noexcept;

        /** @brief Underlying @type_vk{Buffer} handle */
        VkBuffer handle() { return _handle; }
        /** @overload */
        operator VkBuffer() { return _handle; }

        /** @brief Handle flags */
        HandleFlags handleFlags() const { return _flags; }

        /**
         * @brief Release the underlying Vulkan buffer
         *
         * Releases ownership of the Vulkan buffer and returns its handle so
         * @fn_vk{DestroyBuffer} is not called on destruction. The internal
         * state is then equivalent to moved-from state.
         * @see @ref wrap()
         */
        VkBuffer release();

    private:
        /* Can't be a reference because of the NoCreate constructor */
        Device* _device;

        VkBuffer _handle;
        HandleFlags _flags;
};

}}

#endif