comp_d3d_common.hpp

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// Copyright 2019-2022, Collabora, Ltd.
// SPDX-License-Identifier: BSL-1.0
/*!
 * @file
 * @brief  Functionality common to D3D11 and D3D12 for client side compositor implementation.
 * @author Rylie Pavlik <rylie.pavlik@collabora.com>
 * @author Jakob Bornecrantz <jakob@collabora.com>
 * @author Fernando Velazquez Innella <finnella@magicleap.com>
 * @ingroup comp_client
 */
#pragma once
 
#include "xrt/xrt_compositor.h"
#include "xrt/xrt_deleters.hpp"
#include "xrt/xrt_results.h"
 
#include "util/u_handles.h"
#include "util/u_logging.h"
 
#include <wil/com.h>
#include <wil/resource.h>
#include <wil/result_macros.h>
 
#include <d3d11_3.h>
 
#include <memory>
#include <vector>
#include <stdint.h>
 
 
namespace xrt::compositor::client {
 
using unique_swapchain_ref =
    std::unique_ptr<struct xrt_swapchain,
                    xrt::deleters::reference_deleter<struct xrt_swapchain, xrt_swapchain_reference>>;
 
 
/**
 * Import the provided handles into a native compositor, without consuming them.
 *
 * @param xcn The native compositor
 * @param handles A vector of uniquely-owned handles. These will be duplicated, not consumed, by this import.
 * @param vkinfo The swapchain create info, with format as a Vulkan constant
 * @param use_dedicated_allocation Passed through to @ref xrt_image_native
 * @param[out] out_xsc The swapchain to populate
 * @return XRT_SUCCESS if everything went well, otherwise whatever error a call internally returned.
 */
static inline xrt_result_t
importFromHandleDuplicates(xrt_compositor_native &xcn,
                           std::vector<wil::unique_handle> const &handles,
                           const struct xrt_swapchain_create_info &vkinfo,
                           bool use_dedicated_allocation,
                           unique_swapchain_ref &out_xsc)
{
        uint32_t image_count = static_cast<uint32_t>(handles.size());
        // Populate for import
        std::vector<xrt_image_native> xins;
        xins.reserve(image_count);
 
        // Keep this around until after successful import, then detach all.
        std::vector<wil::unique_handle> handlesForImport;
        handlesForImport.reserve(image_count);
 
        for (const wil::unique_handle &handle : handles) {
                wil::unique_handle duped{u_graphics_buffer_ref(handle.get())};
                xrt_image_native xin{};
                xin.handle = duped.get();
                xin.size = 0;
                xin.use_dedicated_allocation = use_dedicated_allocation;
 
                handlesForImport.emplace_back(std::move(duped));
                xins.emplace_back(xin);
        }
 
        // Import into the native compositor, to create the corresponding swapchain which we wrap.
        xrt_swapchain *xsc = nullptr;
        xrt_result_t xret = xrt_comp_import_swapchain(&(xcn.base), &vkinfo, xins.data(), image_count, &xsc);
        if (xret != XRT_SUCCESS) {
                return xret;
        }
        // Let unique_ptr manage the lifetime of xsc now
        out_xsc.reset(xsc);
 
        // The imported swapchain took ownership of them now, release them from ownership here.
        for (auto &h : handlesForImport) {
                h.release();
        }
        return XRT_SUCCESS;
}
 
 
/**
 * Import the provided handles into a native compositor.
 *
 * @param xcn The native compositor
 * @param handles A vector of DXGI handles.
 * @param vkinfo The swapchain create info, with format as a Vulkan constant
 * @param use_dedicated_allocation Passed through to @ref xrt_image_native
 * @param[out] out_xsc The swapchain to populate
 * @return XRT_SUCCESS if everything went well, otherwise whatever error a call internally returned.
 */
static inline xrt_result_t
importFromDxgiHandles(xrt_compositor_native &xcn,
                      std::vector<HANDLE> const &handles,
                      const struct xrt_swapchain_create_info &vkinfo,
                      bool use_dedicated_allocation,
                      unique_swapchain_ref &out_xsc)
{
        uint32_t image_count = static_cast<uint32_t>(handles.size());
        // Populate for import
        std::vector<xrt_image_native> xins;
        xins.reserve(image_count);
 
        for (HANDLE handle : handles) {
                xrt_image_native xin{};
                xin.handle = handle;
                xin.size = 0;
                xin.use_dedicated_allocation = use_dedicated_allocation;
                xin.is_dxgi_handle = true;
 
                xins.emplace_back(xin);
        }
 
        // Import into the native compositor, to create the corresponding swapchain which we wrap.
        xrt_swapchain *xsc = nullptr;
        xrt_result_t xret = xrt_comp_import_swapchain(&(xcn.base), &vkinfo, xins.data(), image_count, &xsc);
        if (xret != XRT_SUCCESS) {
                return xret;
        }
        // Let unique_ptr manage the lifetime of xsc now
        out_xsc.reset(xsc);
 
        return XRT_SUCCESS;
}
 
/**
 * A collection of DXGIKeyedMutex objects, one for each swapchain image in a swapchain.
 *
 */
class KeyedMutexCollection
{
public:
        // 0 is special
        static constexpr uint64_t kKeyedMutexKey = 0;
 
        /**
         * @brief Construct a new Keyed Mutex Collection object
         *
         * @param log_level The compositor log level to use
         */
        explicit KeyedMutexCollection(u_logging_level log_level) noexcept;
 
        /**
         * Make the keyed mutex vector before starting to use the images.
         *
         * @param images Your vector of textures to acquire keyed mutexes from.
         */
        xrt_result_t
        init(const std::vector<wil::com_ptr<ID3D11Texture2D1>> &images) noexcept;
 
        /**
         * Wait for acquisition of the keyed mutex.
         *
         * @param index Swapchain image index
         * @param timeout_ns Timeout in nanoseconds or XRT_INFINITE_DURATION
         * @return xrt_result_t: XRT_SUCCESS, XRT_TIMEOUT, or some error
         */
        xrt_result_t
        waitKeyedMutex(uint32_t index, uint64_t timeout_ns) noexcept;
 
        /**
         * Release the keyed mutex
         *
         * @param index Swapchain image index
         * @return xrt_result_t
         */
        xrt_result_t
        releaseKeyedMutex(uint32_t index) noexcept;
 
private:
        //! Keyed mutex per image associated with client_d3d11_compositor::app_device
        std::vector<wil::com_ptr<IDXGIKeyedMutex>> keyed_mutex_collection;
 
        std::vector<bool> keyed_mutex_acquired;
 
        //! Logging level.
        u_logging_level log_level;
};
 
 
} // namespace xrt::compositor::client