vulkan/libvulkan/swapchain.cpp

/*
 * Copyright 2015 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <algorithm>

#include <log/log.h>
#include <gui/BufferQueue.h>
#include <sync/sync.h>
#include <utils/StrongPointer.h>
#include <utils/SortedVector.h>

#include "driver.h"

// TODO(jessehall): Currently we don't have a good error code for when a native
// window operation fails. Just returning INITIALIZATION_FAILED for now. Later
// versions (post SDK 0.9) of the API/extension have a better error code.
// When updating to that version, audit all error returns.
namespace vulkan {
namespace driver {

namespace {

const VkSurfaceTransformFlagsKHR kSupportedTransforms =
    VK_SURFACE_TRANSFORM_IDENTITY_BIT_KHR |
    VK_SURFACE_TRANSFORM_ROTATE_90_BIT_KHR |
    VK_SURFACE_TRANSFORM_ROTATE_180_BIT_KHR |
    VK_SURFACE_TRANSFORM_ROTATE_270_BIT_KHR |
    // TODO(jessehall): See TODO in TranslateNativeToVulkanTransform.
    // VK_SURFACE_TRANSFORM_HORIZONTAL_MIRROR_BIT_KHR |
    // VK_SURFACE_TRANSFORM_HORIZONTAL_MIRROR_ROTATE_90_BIT_KHR |
    // VK_SURFACE_TRANSFORM_HORIZONTAL_MIRROR_ROTATE_180_BIT_KHR |
    // VK_SURFACE_TRANSFORM_HORIZONTAL_MIRROR_ROTATE_270_BIT_KHR |
    VK_SURFACE_TRANSFORM_INHERIT_BIT_KHR;

VkSurfaceTransformFlagBitsKHR TranslateNativeToVulkanTransform(int native) {
    // Native and Vulkan transforms are isomorphic, but are represented
    // differently. Vulkan transforms are built up of an optional horizontal
    // mirror, followed by a clockwise 0/90/180/270-degree rotation. Native
    // transforms are built up from a horizontal flip, vertical flip, and
    // 90-degree rotation, all optional but always in that order.

    // TODO(jessehall): For now, only support pure rotations, not
    // flip or flip-and-rotate, until I have more time to test them and build
    // sample code. As far as I know we never actually use anything besides
    // pure rotations anyway.

    switch (native) {
        case 0:  // 0x0
            return VK_SURFACE_TRANSFORM_IDENTITY_BIT_KHR;
        // case NATIVE_WINDOW_TRANSFORM_FLIP_H:  // 0x1
        //     return VK_SURFACE_TRANSFORM_HORIZONTAL_MIRROR_BIT_KHR;
        // case NATIVE_WINDOW_TRANSFORM_FLIP_V:  // 0x2
        //     return VK_SURFACE_TRANSFORM_HORIZONTAL_MIRROR_ROTATE_180_BIT_KHR;
        case NATIVE_WINDOW_TRANSFORM_ROT_180:  // FLIP_H | FLIP_V
            return VK_SURFACE_TRANSFORM_ROTATE_180_BIT_KHR;
        case NATIVE_WINDOW_TRANSFORM_ROT_90:  // 0x4
            return VK_SURFACE_TRANSFORM_ROTATE_90_BIT_KHR;
        // case NATIVE_WINDOW_TRANSFORM_FLIP_H | NATIVE_WINDOW_TRANSFORM_ROT_90:
        //     return VK_SURFACE_TRANSFORM_HORIZONTAL_MIRROR_ROTATE_90_BIT_KHR;
        // case NATIVE_WINDOW_TRANSFORM_FLIP_V | NATIVE_WINDOW_TRANSFORM_ROT_90:
        //     return VK_SURFACE_TRANSFORM_HORIZONTAL_MIRROR_ROTATE_270_BIT_KHR;
        case NATIVE_WINDOW_TRANSFORM_ROT_270:  // FLIP_H | FLIP_V | ROT_90
            return VK_SURFACE_TRANSFORM_ROTATE_270_BIT_KHR;
        case NATIVE_WINDOW_TRANSFORM_INVERSE_DISPLAY:
        default:
            return VK_SURFACE_TRANSFORM_IDENTITY_BIT_KHR;
    }
}

int InvertTransformToNative(VkSurfaceTransformFlagBitsKHR transform) {
    switch (transform) {
        case VK_SURFACE_TRANSFORM_ROTATE_90_BIT_KHR:
            return NATIVE_WINDOW_TRANSFORM_ROT_270;
        case VK_SURFACE_TRANSFORM_ROTATE_180_BIT_KHR:
            return NATIVE_WINDOW_TRANSFORM_ROT_180;
        case VK_SURFACE_TRANSFORM_ROTATE_270_BIT_KHR:
            return NATIVE_WINDOW_TRANSFORM_ROT_90;
        // TODO(jessehall): See TODO in TranslateNativeToVulkanTransform.
        // case VK_SURFACE_TRANSFORM_HORIZONTAL_MIRROR_BIT_KHR:
        //     return NATIVE_WINDOW_TRANSFORM_FLIP_H;
        // case VK_SURFACE_TRANSFORM_HORIZONTAL_MIRROR_ROTATE_90_BIT_KHR:
        //     return NATIVE_WINDOW_TRANSFORM_FLIP_H |
        //            NATIVE_WINDOW_TRANSFORM_ROT_90;
        // case VK_SURFACE_TRANSFORM_HORIZONTAL_MIRROR_ROTATE_180_BIT_KHR:
        //     return NATIVE_WINDOW_TRANSFORM_FLIP_V;
        // case VK_SURFACE_TRANSFORM_HORIZONTAL_MIRROR_ROTATE_270_BIT_KHR:
        //     return NATIVE_WINDOW_TRANSFORM_FLIP_V |
        //            NATIVE_WINDOW_TRANSFORM_ROT_90;
        case VK_SURFACE_TRANSFORM_IDENTITY_BIT_KHR:
        case VK_SURFACE_TRANSFORM_INHERIT_BIT_KHR:
        default:
            return 0;
    }
}

class TimingInfo {
   public:
    TimingInfo() {}
    TimingInfo(const VkPresentTimeGOOGLE* qp) {
        vals_.presentID = qp->presentID;
        vals_.desiredPresentTime = qp->desiredPresentTime;
        timestamp_desired_present_time_ = 0;
        timestamp_actual_present_time_ = 0;
        timestamp_render_complete_time_ = 0;
        timestamp_composition_latch_time_ = 0;
    }
    bool ready() {
        return (timestamp_desired_present_time_ &&
                timestamp_actual_present_time_ &&
                timestamp_render_complete_time_ &&
                timestamp_composition_latch_time_);
    }
    void calculate(uint64_t rdur) {
        vals_.actualPresentTime = timestamp_actual_present_time_;
        uint64_t margin = (timestamp_composition_latch_time_ -
                           timestamp_render_complete_time_);
        // Calculate vals_.earliestPresentTime, and potentially adjust
        // vals_.presentMargin.  The initial value of vals_.earliestPresentTime
        // is vals_.actualPresentTime.  If we can subtract rdur (the duration
        // of a refresh cycle) from vals_.earliestPresentTime (and also from
        // vals_.presentMargin) and still leave a positive margin, then we can
        // report to the application that it could have presented earlier than
        // it did (per the extension specification).  If for some reason, we
        // can do this subtraction repeatedly, we do, since
        // vals_.earliestPresentTime really is supposed to be the "earliest".
        uint64_t early_time = vals_.actualPresentTime;
        while ((margin > rdur) &&
               ((early_time - rdur) > timestamp_composition_latch_time_)) {
            early_time -= rdur;
            margin -= rdur;
        }
        vals_.earliestPresentTime = early_time;
        vals_.presentMargin = margin;
    }
    void get_values(VkPastPresentationTimingGOOGLE* values) { *values = vals_; }

   public:
    VkPastPresentationTimingGOOGLE vals_;

    uint64_t timestamp_desired_present_time_;
    uint64_t timestamp_actual_present_time_;
    uint64_t timestamp_render_complete_time_;
    uint64_t timestamp_composition_latch_time_;
};

static inline int compare_type(const TimingInfo& lhs, const TimingInfo& rhs) {
    // TODO(ianelliott): Change this from presentID to the frame ID once
    // brianderson lands the appropriate patch:
    if (lhs.vals_.presentID < rhs.vals_.presentID)
        return -1;
    if (lhs.vals_.presentID > rhs.vals_.presentID)
        return 1;
    return 0;
}

// ----------------------------------------------------------------------------

struct Surface {
    android::sp<ANativeWindow> window;
    VkSwapchainKHR swapchain_handle;
};

VkSurfaceKHR HandleFromSurface(Surface* surface) {
    return VkSurfaceKHR(reinterpret_cast<uint64_t>(surface));
}

Surface* SurfaceFromHandle(VkSurfaceKHR handle) {
    return reinterpret_cast<Surface*>(handle);
}

// Maximum number of TimingInfo structs to keep per swapchain:
enum { MAX_TIMING_INFOS = 10 };
// Minimum number of frames to look for in the past (so we don't cause
// syncronous requests to Surface Flinger):
enum { MIN_NUM_FRAMES_AGO = 5 };

struct Swapchain {
    Swapchain(Surface& surface_, uint32_t num_images_)
        : surface(surface_),
          num_images(num_images_),
          frame_timestamps_enabled(false) {
        timing.clear();
    }

    Surface& surface;
    uint32_t num_images;
    bool frame_timestamps_enabled;

    struct Image {
        Image() : image(VK_NULL_HANDLE), dequeue_fence(-1), dequeued(false) {}
        VkImage image;
        android::sp<ANativeWindowBuffer> buffer;
        // The fence is only valid when the buffer is dequeued, and should be
        // -1 any other time. When valid, we own the fd, and must ensure it is
        // closed: either by closing it explicitly when queueing the buffer,
        // or by passing ownership e.g. to ANativeWindow::cancelBuffer().
        int dequeue_fence;
        bool dequeued;
    } images[android::BufferQueue::NUM_BUFFER_SLOTS];

    android::SortedVector<TimingInfo> timing;
};

VkSwapchainKHR HandleFromSwapchain(Swapchain* swapchain) {
    return VkSwapchainKHR(reinterpret_cast<uint64_t>(swapchain));
}

Swapchain* SwapchainFromHandle(VkSwapchainKHR handle) {
    return reinterpret_cast<Swapchain*>(handle);
}

void ReleaseSwapchainImage(VkDevice device,
                           ANativeWindow* window,
                           int release_fence,
                           Swapchain::Image& image) {
    ALOG_ASSERT(release_fence == -1 || image.dequeued,
                "ReleaseSwapchainImage: can't provide a release fence for "
                "non-dequeued images");

    if (image.dequeued) {
        if (release_fence >= 0) {
            // We get here from vkQueuePresentKHR. The application is
            // responsible for creating an execution dependency chain from
            // vkAcquireNextImage (dequeue_fence) to vkQueuePresentKHR
            // (release_fence), so we can drop the dequeue_fence here.
            if (image.dequeue_fence >= 0)
                close(image.dequeue_fence);
        } else {
            // We get here during swapchain destruction, or various serious
            // error cases e.g. when we can't create the release_fence during
            // vkQueuePresentKHR. In non-error cases, the dequeue_fence should
            // have already signalled, since the swapchain images are supposed
            // to be idle before the swapchain is destroyed. In error cases,
            // there may be rendering in flight to the image, but since we
            // weren't able to create a release_fence, waiting for the
            // dequeue_fence is about the best we can do.
            release_fence = image.dequeue_fence;
        }
        image.dequeue_fence = -1;

        if (window) {
            window->cancelBuffer(window, image.buffer.get(), release_fence);
        } else {
            if (release_fence >= 0) {
                sync_wait(release_fence, -1 /* forever */);
                close(release_fence);
            }
        }

        image.dequeued = false;
    }

    if (image.image) {
        GetData(device).driver.DestroyImage(device, image.image, nullptr);
        image.image = VK_NULL_HANDLE;
    }

    image.buffer.clear();
}

void OrphanSwapchain(VkDevice device, Swapchain* swapchain) {
    if (swapchain->surface.swapchain_handle != HandleFromSwapchain(swapchain))
        return;
    for (uint32_t i = 0; i < swapchain->num_images; i++) {
        if (!swapchain->images[i].dequeued)
            ReleaseSwapchainImage(device, nullptr, -1, swapchain->images[i]);
    }
    swapchain->surface.swapchain_handle = VK_NULL_HANDLE;
    swapchain->timing.clear();
}

uint32_t get_num_ready_timings(Swapchain& swapchain) {
    uint32_t num_ready = 0;
    uint32_t num_timings = static_cast<uint32_t>(swapchain.timing.size());
    uint32_t frames_ago = num_timings;
    for (uint32_t i = 0; i < num_timings; i++) {
        TimingInfo* ti = &swapchain.timing.editItemAt(i);
        if (ti) {
            if (ti->ready()) {
                // This TimingInfo is ready to be reported to the user.  Add it
                // to the num_ready.
                num_ready++;
            } else {
                // This TimingInfo is not yet ready to be reported to the user,
                // and so we should look for any available timestamps that
                // might make it ready.
                int64_t desired_present_time = 0;
                int64_t render_complete_time = 0;
                int64_t composition_latch_time = 0;
                int64_t actual_present_time = 0;
                for (uint32_t f = MIN_NUM_FRAMES_AGO; f < frames_ago; f++) {
                    // Obtain timestamps:
                    int ret = native_window_get_frame_timestamps(
                        swapchain.surface.window.get(), f,
                        &desired_present_time, &render_complete_time,
                        &composition_latch_time,
                        NULL,  //&first_composition_start_time,
                        NULL,  //&last_composition_start_time,
                        NULL,  //&composition_finish_time,
                        // TODO(ianelliott): Maybe ask if this one is
                        // supported, at startup time (since it may not be
                        // supported):
                        &actual_present_time,
                        NULL,  //&display_retire_time,
                        NULL,  //&dequeue_ready_time,
                        NULL /*&reads_done_time*/);
                    if (ret) {
                        break;
                    } else if (!ret) {
                        // We obtained at least one valid timestamp.  See if it
                        // is for the present represented by this TimingInfo:
                        if (static_cast<uint64_t>(desired_present_time) ==
                            ti->vals_.desiredPresentTime) {
                            // Record the timestamp(s) we received, and then
                            // see if this TimingInfo is ready to be reported
                            // to the user:
                            ti->timestamp_desired_present_time_ =
                                static_cast<uint64_t>(desired_present_time);
                            ti->timestamp_actual_present_time_ =
                                static_cast<uint64_t>(actual_present_time);
                            ti->timestamp_render_complete_time_ =
                                static_cast<uint64_t>(render_complete_time);
                            ti->timestamp_composition_latch_time_ =
                                static_cast<uint64_t>(composition_latch_time);

                            if (ti->ready()) {
                                // The TimingInfo has received enough
                                // timestamps, and should now use those
                                // timestamps to calculate the info that should
                                // be reported to the user:
                                //
                                // FIXME: GET ACTUAL VALUE RATHER THAN HARD-CODE
                                // IT:
                                ti->calculate(16666666);
                                num_ready++;
                            }
                            break;
                        }
                    }
                }
            }
        }
    }
    return num_ready;
}

// TODO(ianelliott): DEAL WITH RETURN VALUE (e.g. VK_INCOMPLETE)!!!
void copy_ready_timings(Swapchain& swapchain,
                        uint32_t* count,
                        VkPastPresentationTimingGOOGLE* timings) {
    uint32_t num_copied = 0;
    uint32_t num_timings = static_cast<uint32_t>(swapchain.timing.size());
    if (*count < num_timings) {
        num_timings = *count;
    }
    for (uint32_t i = 0; i < num_timings; i++) {
        TimingInfo* ti = &swapchain.timing.editItemAt(i);
        if (ti && ti->ready()) {
            ti->get_values(&timings[num_copied]);
            num_copied++;
            // We only report the values for a given present once, so remove
            // them from swapchain.timing:
            //
            // TODO(ianelliott): SEE WHAT HAPPENS TO THE LOOP WHEN THE
            // FOLLOWING IS DONE:
            swapchain.timing.removeAt(i);
            i--;
            num_timings--;
            if (*count == num_copied) {
                break;
            }
        }
    }
    *count = num_copied;
}

}  // anonymous namespace

VKAPI_ATTR
VkResult CreateAndroidSurfaceKHR(
    VkInstance instance,
    const VkAndroidSurfaceCreateInfoKHR* pCreateInfo,
    const VkAllocationCallbacks* allocator,
    VkSurfaceKHR* out_surface) {
    if (!allocator)
        allocator = &GetData(instance).allocator;
    void* mem = allocator->pfnAllocation(allocator->pUserData, sizeof(Surface),
                                         alignof(Surface),
                                         VK_SYSTEM_ALLOCATION_SCOPE_OBJECT);
    if (!mem)
        return VK_ERROR_OUT_OF_HOST_MEMORY;
    Surface* surface = new (mem) Surface;

    surface->window = pCreateInfo->window;
    surface->swapchain_handle = VK_NULL_HANDLE;

    // TODO(jessehall): Create and use NATIVE_WINDOW_API_VULKAN.
    int err =
        native_window_api_connect(surface->window.get(), NATIVE_WINDOW_API_EGL);
    if (err != 0) {
        // TODO(jessehall): Improve error reporting. Can we enumerate possible
        // errors and translate them to valid Vulkan result codes?
        ALOGE("native_window_api_connect() failed: %s (%d)", strerror(-err),
              err);
        surface->~Surface();
        allocator->pfnFree(allocator->pUserData, surface);
        return VK_ERROR_INITIALIZATION_FAILED;
    }

    *out_surface = HandleFromSurface(surface);
    return VK_SUCCESS;
}

VKAPI_ATTR
void DestroySurfaceKHR(VkInstance instance,
                       VkSurfaceKHR surface_handle,
                       const VkAllocationCallbacks* allocator) {
    Surface* surface = SurfaceFromHandle(surface_handle);
    if (!surface)
        return;
    native_window_api_disconnect(surface->window.get(), NATIVE_WINDOW_API_EGL);
    ALOGV_IF(surface->swapchain_handle != VK_NULL_HANDLE,
             "destroyed VkSurfaceKHR 0x%" PRIx64
             " has active VkSwapchainKHR 0x%" PRIx64,
             reinterpret_cast<uint64_t>(surface_handle),
             reinterpret_cast<uint64_t>(surface->swapchain_handle));
    surface->~Surface();
    if (!allocator)
        allocator = &GetData(instance).allocator;
    allocator->pfnFree(allocator->pUserData, surface);
}

VKAPI_ATTR
VkResult GetPhysicalDeviceSurfaceSupportKHR(VkPhysicalDevice /*pdev*/,
                                            uint32_t /*queue_family*/,
                                            VkSurfaceKHR /*surface*/,
                                            VkBool32* supported) {
    *supported = VK_TRUE;
    return VK_SUCCESS;
}

VKAPI_ATTR
VkResult GetPhysicalDeviceSurfaceCapabilitiesKHR(
    VkPhysicalDevice /*pdev*/,
    VkSurfaceKHR surface,
    VkSurfaceCapabilitiesKHR* capabilities) {
    int err;
    ANativeWindow* window = SurfaceFromHandle(surface)->window.get();

    int width, height;
    err = window->query(window, NATIVE_WINDOW_DEFAULT_WIDTH, &width);
    if (err != 0) {
        ALOGE("NATIVE_WINDOW_DEFAULT_WIDTH query failed: %s (%d)",
              strerror(-err), err);
        return VK_ERROR_INITIALIZATION_FAILED;
    }
    err = window->query(window, NATIVE_WINDOW_DEFAULT_HEIGHT, &height);
    if (err != 0) {
        ALOGE("NATIVE_WINDOW_DEFAULT_WIDTH query failed: %s (%d)",
              strerror(-err), err);
        return VK_ERROR_INITIALIZATION_FAILED;
    }

    int transform_hint;
    err = window->query(window, NATIVE_WINDOW_TRANSFORM_HINT, &transform_hint);
    if (err != 0) {
        ALOGE("NATIVE_WINDOW_TRANSFORM_HINT query failed: %s (%d)",
              strerror(-err), err);
        return VK_ERROR_INITIALIZATION_FAILED;
    }

    // TODO(jessehall): Figure out what the min/max values should be.
    capabilities->minImageCount = 2;
    capabilities->maxImageCount = 3;

    capabilities->currentExtent =
        VkExtent2D{static_cast<uint32_t>(width), static_cast<uint32_t>(height)};

    // TODO(jessehall): Figure out what the max extent should be. Maximum
    // texture dimension maybe?
    capabilities->minImageExtent = VkExtent2D{1, 1};
    capabilities->maxImageExtent = VkExtent2D{4096, 4096};

    capabilities->maxImageArrayLayers = 1;

    capabilities->supportedTransforms = kSupportedTransforms;
    capabilities->currentTransform =
        TranslateNativeToVulkanTransform(transform_hint);

    // On Android, window composition is a WindowManager property, not something
    // associated with the bufferqueue. It can't be changed from here.
    capabilities->supportedCompositeAlpha = VK_COMPOSITE_ALPHA_INHERIT_BIT_KHR;

    // TODO(jessehall): I think these are right, but haven't thought hard about
    // it. Do we need to query the driver for support of any of these?
    // Currently not included:
    // - VK_IMAGE_USAGE_DEPTH_STENCIL_BIT: definitely not
    // - VK_IMAGE_USAGE_TRANSIENT_ATTACHMENT_BIT: definitely not
    capabilities->supportedUsageFlags =
        VK_IMAGE_USAGE_TRANSFER_SRC_BIT | VK_IMAGE_USAGE_TRANSFER_DST_BIT |
        VK_IMAGE_USAGE_SAMPLED_BIT | VK_IMAGE_USAGE_STORAGE_BIT |
        VK_IMAGE_USAGE_COLOR_ATTACHMENT_BIT |
        VK_IMAGE_USAGE_INPUT_ATTACHMENT_BIT;

    return VK_SUCCESS;
}

VKAPI_ATTR
VkResult GetPhysicalDeviceSurfaceFormatsKHR(VkPhysicalDevice /*pdev*/,
                                            VkSurfaceKHR /*surface*/,
                                            uint32_t* count,
                                            VkSurfaceFormatKHR* formats) {
    // TODO(jessehall): Fill out the set of supported formats. Longer term, add
    // a new gralloc method to query whether a (format, usage) pair is
    // supported, and check that for each gralloc format that corresponds to a
    // Vulkan format. Shorter term, just add a few more formats to the ones
    // hardcoded below.

    const VkSurfaceFormatKHR kFormats[] = {
        {VK_FORMAT_R8G8B8A8_UNORM, VK_COLOR_SPACE_SRGB_NONLINEAR_KHR},
        {VK_FORMAT_R8G8B8A8_SRGB, VK_COLOR_SPACE_SRGB_NONLINEAR_KHR},
        {VK_FORMAT_R5G6B5_UNORM_PACK16, VK_COLOR_SPACE_SRGB_NONLINEAR_KHR},
    };
    const uint32_t kNumFormats = sizeof(kFormats) / sizeof(kFormats[0]);

    VkResult result = VK_SUCCESS;
    if (formats) {
        if (*count < kNumFormats)
            result = VK_INCOMPLETE;
        *count = std::min(*count, kNumFormats);
        std::copy(kFormats, kFormats + *count, formats);
    } else {
        *count = kNumFormats;
    }
    return result;
}

VKAPI_ATTR
VkResult GetPhysicalDeviceSurfacePresentModesKHR(VkPhysicalDevice /*pdev*/,
                                                 VkSurfaceKHR /*surface*/,
                                                 uint32_t* count,
                                                 VkPresentModeKHR* modes) {
    const VkPresentModeKHR kModes[] = {
        VK_PRESENT_MODE_MAILBOX_KHR, VK_PRESENT_MODE_FIFO_KHR,
        // TODO(chrisforbes): should only expose this if the driver can.
        VK_PRESENT_MODE_FRONT_BUFFERED_DEMAND_REFRESH_KHR,
        VK_PRESENT_MODE_FRONT_BUFFERED_CONTINUOUS_REFRESH_KHR,
    };
    const uint32_t kNumModes = sizeof(kModes) / sizeof(kModes[0]);

    VkResult result = VK_SUCCESS;
    if (modes) {
        if (*count < kNumModes)
            result = VK_INCOMPLETE;
        *count = std::min(*count, kNumModes);
        std::copy(kModes, kModes + *count, modes);
    } else {
        *count = kNumModes;
    }
    return result;
}

VKAPI_ATTR
VkResult CreateSwapchainKHR(VkDevice device,
                            const VkSwapchainCreateInfoKHR* create_info,
                            const VkAllocationCallbacks* allocator,
                            VkSwapchainKHR* swapchain_handle) {
    int err;
    VkResult result = VK_SUCCESS;

    ALOGV("vkCreateSwapchainKHR: surface=0x%" PRIx64
          " minImageCount=%u imageFormat=%u imageColorSpace=%u"
          " imageExtent=%ux%u imageUsage=%#x preTransform=%u presentMode=%u"
          " oldSwapchain=0x%" PRIx64,
          reinterpret_cast<uint64_t>(create_info->surface),
          create_info->minImageCount, create_info->imageFormat,
          create_info->imageColorSpace, create_info->imageExtent.width,
          create_info->imageExtent.height, create_info->imageUsage,
          create_info->preTransform, create_info->presentMode,
          reinterpret_cast<uint64_t>(create_info->oldSwapchain));

    if (!allocator)
        allocator = &GetData(device).allocator;

    ALOGV_IF(create_info->imageArrayLayers != 1,
             "swapchain imageArrayLayers=%u not supported",
             create_info->imageArrayLayers);
    ALOGV_IF(create_info->imageColorSpace != VK_COLOR_SPACE_SRGB_NONLINEAR_KHR,
             "swapchain imageColorSpace=%u not supported",
             create_info->imageColorSpace);
    ALOGV_IF((create_info->preTransform & ~kSupportedTransforms) != 0,
             "swapchain preTransform=%#x not supported",
             create_info->preTransform);
    ALOGV_IF(!(create_info->presentMode == VK_PRESENT_MODE_FIFO_KHR ||
               create_info->presentMode == VK_PRESENT_MODE_MAILBOX_KHR ||
               create_info->presentMode == VK_PRESENT_MODE_FRONT_BUFFERED_DEMAND_REFRESH_KHR ||
               create_info->presentMode == VK_PRESENT_MODE_FRONT_BUFFERED_CONTINUOUS_REFRESH_KHR),
             "swapchain presentMode=%u not supported",
             create_info->presentMode);

    Surface& surface = *SurfaceFromHandle(create_info->surface);

    if (surface.swapchain_handle != create_info->oldSwapchain) {
        ALOGV("Can't create a swapchain for VkSurfaceKHR 0x%" PRIx64
              " because it already has active swapchain 0x%" PRIx64
              " but VkSwapchainCreateInfo::oldSwapchain=0x%" PRIx64,
              reinterpret_cast<uint64_t>(create_info->surface),
              reinterpret_cast<uint64_t>(surface.swapchain_handle),
              reinterpret_cast<uint64_t>(create_info->oldSwapchain));
        return VK_ERROR_NATIVE_WINDOW_IN_USE_KHR;
    }
    if (create_info->oldSwapchain != VK_NULL_HANDLE)
        OrphanSwapchain(device, SwapchainFromHandle(create_info->oldSwapchain));

    // -- Reset the native window --
    // The native window might have been used previously, and had its properties
    // changed from defaults. That will affect the answer we get for queries
    // like MIN_UNDEQUED_BUFFERS. Reset to a known/default state before we
    // attempt such queries.

    // The native window only allows dequeueing all buffers before any have
    // been queued, since after that point at least one is assumed to be in
    // non-FREE state at any given time. Disconnecting and re-connecting
    // orphans the previous buffers, getting us back to the state where we can
    // dequeue all buffers.
    err = native_window_api_disconnect(surface.window.get(),
                                       NATIVE_WINDOW_API_EGL);
    ALOGW_IF(err != 0, "native_window_api_disconnect failed: %s (%d)",
             strerror(-err), err);
    err =
        native_window_api_connect(surface.window.get(), NATIVE_WINDOW_API_EGL);
    ALOGW_IF(err != 0, "native_window_api_connect failed: %s (%d)",
             strerror(-err), err);

    err = native_window_set_buffer_count(surface.window.get(), 0);
    if (err != 0) {
        ALOGE("native_window_set_buffer_count(0) failed: %s (%d)",
              strerror(-err), err);
        return VK_ERROR_INITIALIZATION_FAILED;
    }

    err = surface.window->setSwapInterval(surface.window.get(), 1);
    if (err != 0) {
        // TODO(jessehall): Improve error reporting. Can we enumerate possible
        // errors and translate them to valid Vulkan result codes?
        ALOGE("native_window->setSwapInterval(1) failed: %s (%d)",
              strerror(-err), err);
        return VK_ERROR_INITIALIZATION_FAILED;
    }

    err = native_window_set_shared_buffer_mode(surface.window.get(), false);
    if (err != 0) {
        ALOGE("native_window_set_shared_buffer_mode(false) failed: %s (%d)",
              strerror(-err), err);
        return VK_ERROR_INITIALIZATION_FAILED;
    }

    err = native_window_set_auto_refresh(surface.window.get(), false);
    if (err != 0) {
        ALOGE("native_window_set_auto_refresh(false) failed: %s (%d)",
              strerror(-err), err);
        return VK_ERROR_INITIALIZATION_FAILED;
    }

    // -- Configure the native window --

    const auto& dispatch = GetData(device).driver;

    int native_format = HAL_PIXEL_FORMAT_RGBA_8888;
    switch (create_info->imageFormat) {
        case VK_FORMAT_R8G8B8A8_UNORM:
        case VK_FORMAT_R8G8B8A8_SRGB:
            native_format = HAL_PIXEL_FORMAT_RGBA_8888;
            break;
        case VK_FORMAT_R5G6B5_UNORM_PACK16:
            native_format = HAL_PIXEL_FORMAT_RGB_565;
            break;
        default:
            ALOGV("unsupported swapchain format %d", create_info->imageFormat);
            break;
    }
    err = native_window_set_buffers_format(surface.window.get(), native_format);
    if (err != 0) {
        // TODO(jessehall): Improve error reporting. Can we enumerate possible
        // errors and translate them to valid Vulkan result codes?
        ALOGE("native_window_set_buffers_format(%d) failed: %s (%d)",
              native_format, strerror(-err), err);
        return VK_ERROR_INITIALIZATION_FAILED;
    }
    err = native_window_set_buffers_data_space(surface.window.get(),
                                               HAL_DATASPACE_SRGB_LINEAR);
    if (err != 0) {
        // TODO(jessehall): Improve error reporting. Can we enumerate possible
        // errors and translate them to valid Vulkan result codes?
        ALOGE("native_window_set_buffers_data_space(%d) failed: %s (%d)",
              HAL_DATASPACE_SRGB_LINEAR, strerror(-err), err);
        return VK_ERROR_INITIALIZATION_FAILED;
    }

    err = native_window_set_buffers_dimensions(
        surface.window.get(), static_cast<int>(create_info->imageExtent.width),
        static_cast<int>(create_info->imageExtent.height));
    if (err != 0) {
        // TODO(jessehall): Improve error reporting. Can we enumerate possible
        // errors and translate them to valid Vulkan result codes?
        ALOGE("native_window_set_buffers_dimensions(%d,%d) failed: %s (%d)",
              create_info->imageExtent.width, create_info->imageExtent.height,
              strerror(-err), err);
        return VK_ERROR_INITIALIZATION_FAILED;
    }

    // VkSwapchainCreateInfo::preTransform indicates the transformation the app
    // applied during rendering. native_window_set_transform() expects the
    // inverse: the transform the app is requesting that the compositor perform
    // during composition. With native windows, pre-transform works by rendering
    // with the same transform the compositor is applying (as in Vulkan), but
    // then requesting the inverse transform, so that when the compositor does
    // it's job the two transforms cancel each other out and the compositor ends
    // up applying an identity transform to the app's buffer.
    err = native_window_set_buffers_transform(
        surface.window.get(),
        InvertTransformToNative(create_info->preTransform));
    if (err != 0) {
        // TODO(jessehall): Improve error reporting. Can we enumerate possible
        // errors and translate them to valid Vulkan result codes?
        ALOGE("native_window_set_buffers_transform(%d) failed: %s (%d)",
              InvertTransformToNative(create_info->preTransform),
              strerror(-err), err);
        return VK_ERROR_INITIALIZATION_FAILED;
    }

    err = native_window_set_scaling_mode(
        surface.window.get(), NATIVE_WINDOW_SCALING_MODE_SCALE_TO_WINDOW);
    if (err != 0) {
        // TODO(jessehall): Improve error reporting. Can we enumerate possible
        // errors and translate them to valid Vulkan result codes?
        ALOGE("native_window_set_scaling_mode(SCALE_TO_WINDOW) failed: %s (%d)",
              strerror(-err), err);
        return VK_ERROR_INITIALIZATION_FAILED;
    }

    int query_value;
    err = surface.window->query(surface.window.get(),
                                NATIVE_WINDOW_MIN_UNDEQUEUED_BUFFERS,
                                &query_value);
    if (err != 0 || query_value < 0) {
        // TODO(jessehall): Improve error reporting. Can we enumerate possible
        // errors and translate them to valid Vulkan result codes?
        ALOGE("window->query failed: %s (%d) value=%d", strerror(-err), err,
              query_value);
        return VK_ERROR_INITIALIZATION_FAILED;
    }
    uint32_t min_undequeued_buffers = static_cast<uint32_t>(query_value);
    // The MIN_UNDEQUEUED_BUFFERS query doesn't know whether we'll be using
    // async mode or not, and assumes not. But in async mode, the BufferQueue
    // requires an extra undequeued buffer.
    // See BufferQueueCore::getMinUndequeuedBufferCountLocked().
    if (create_info->presentMode == VK_PRESENT_MODE_MAILBOX_KHR)
        min_undequeued_buffers += 1;

    uint32_t num_images =
        (create_info->minImageCount - 1) + min_undequeued_buffers;
    err = native_window_set_buffer_count(surface.window.get(), num_images);
    if (err != 0) {
        // TODO(jessehall): Improve error reporting. Can we enumerate possible
        // errors and translate them to valid Vulkan result codes?
        ALOGE("native_window_set_buffer_count(%d) failed: %s (%d)", num_images,
              strerror(-err), err);
        return VK_ERROR_INITIALIZATION_FAILED;
    }

    VkSwapchainImageUsageFlagsANDROID swapchain_image_usage = 0;
    if (create_info->presentMode == VK_PRESENT_MODE_FRONT_BUFFERED_DEMAND_REFRESH_KHR ||
        create_info->presentMode == VK_PRESENT_MODE_FRONT_BUFFERED_CONTINUOUS_REFRESH_KHR) {
        swapchain_image_usage |= VK_SWAPCHAIN_IMAGE_USAGE_FRONT_BUFFER_BIT_ANDROID;

        err = native_window_set_shared_buffer_mode(surface.window.get(), true);
        if (err != 0) {
            ALOGE("native_window_set_shared_buffer_mode failed: %s (%d)", strerror(-err), err);
            return VK_ERROR_INITIALIZATION_FAILED;
        }
    }

    if (create_info->presentMode == VK_PRESENT_MODE_FRONT_BUFFERED_CONTINUOUS_REFRESH_KHR) {
        err = native_window_set_auto_refresh(surface.window.get(), true);
        if (err != 0) {
            ALOGE("native_window_set_auto_refresh failed: %s (%d)", strerror(-err), err);
            return VK_ERROR_INITIALIZATION_FAILED;
        }
    }

    int gralloc_usage = 0;
    if (dispatch.GetSwapchainGrallocUsage2ANDROID) {
        result = dispatch.GetSwapchainGrallocUsage2ANDROID(
            device, create_info->imageFormat, create_info->imageUsage,
            swapchain_image_usage, &gralloc_usage);
        if (result != VK_SUCCESS) {
            ALOGE("vkGetSwapchainGrallocUsage2ANDROID failed: %d", result);
            return VK_ERROR_INITIALIZATION_FAILED;
        }
    } else if (dispatch.GetSwapchainGrallocUsageANDROID) {
        result = dispatch.GetSwapchainGrallocUsageANDROID(
            device, create_info->imageFormat, create_info->imageUsage,
            &gralloc_usage);
        if (result != VK_SUCCESS) {
            ALOGE("vkGetSwapchainGrallocUsageANDROID failed: %d", result);
            return VK_ERROR_INITIALIZATION_FAILED;
        }
    } else {
        gralloc_usage = GRALLOC_USAGE_HW_RENDER | GRALLOC_USAGE_HW_TEXTURE;
    }
    err = native_window_set_usage(surface.window.get(), gralloc_usage);
    if (err != 0) {
        // TODO(jessehall): Improve error reporting. Can we enumerate possible
        // errors and translate them to valid Vulkan result codes?
        ALOGE("native_window_set_usage failed: %s (%d)", strerror(-err), err);
        return VK_ERROR_INITIALIZATION_FAILED;
    }

    int swap_interval =
        create_info->presentMode == VK_PRESENT_MODE_MAILBOX_KHR ? 0 : 1;
    err = surface.window->setSwapInterval(surface.window.get(), swap_interval);
    if (err != 0) {
        // TODO(jessehall): Improve error reporting. Can we enumerate possible
        // errors and translate them to valid Vulkan result codes?
        ALOGE("native_window->setSwapInterval(%d) failed: %s (%d)",
              swap_interval, strerror(-err), err);
        return VK_ERROR_INITIALIZATION_FAILED;
    }

    // -- Allocate our Swapchain object --
    // After this point, we must deallocate the swapchain on error.

    void* mem = allocator->pfnAllocation(allocator->pUserData,
                                         sizeof(Swapchain), alignof(Swapchain),
                                         VK_SYSTEM_ALLOCATION_SCOPE_OBJECT);
    if (!mem)
        return VK_ERROR_OUT_OF_HOST_MEMORY;
    Swapchain* swapchain = new (mem) Swapchain(surface, num_images);

    // -- Dequeue all buffers and create a VkImage for each --
    // Any failures during or after this must cancel the dequeued buffers.

    VkSwapchainImageCreateInfoANDROID swapchain_image_create = {
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wold-style-cast"
        .sType = VK_STRUCTURE_TYPE_SWAPCHAIN_IMAGE_CREATE_INFO_ANDROID,
#pragma clang diagnostic pop
        .pNext = nullptr,
        .usage = swapchain_image_usage,
    };
    VkNativeBufferANDROID image_native_buffer = {
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wold-style-cast"
        .sType = VK_STRUCTURE_TYPE_NATIVE_BUFFER_ANDROID,
#pragma clang diagnostic pop
        .pNext = &swapchain_image_create,
    };
    VkImageCreateInfo image_create = {
        .sType = VK_STRUCTURE_TYPE_IMAGE_CREATE_INFO,
        .pNext = &image_native_buffer,
        .imageType = VK_IMAGE_TYPE_2D,
        .format = create_info->imageFormat,
        .extent = {0, 0, 1},
        .mipLevels = 1,
        .arrayLayers = 1,
        .samples = VK_SAMPLE_COUNT_1_BIT,
        .tiling = VK_IMAGE_TILING_OPTIMAL,
        .usage = create_info->imageUsage,
        .flags = 0,
        .sharingMode = create_info->imageSharingMode,
        .queueFamilyIndexCount = create_info->queueFamilyIndexCount,
        .pQueueFamilyIndices = create_info->pQueueFamilyIndices,
    };

    for (uint32_t i = 0; i < num_images; i++) {
        Swapchain::Image& img = swapchain->images[i];

        ANativeWindowBuffer* buffer;
        err = surface.window->dequeueBuffer(surface.window.get(), &buffer,
                                            &img.dequeue_fence);
        if (err != 0) {
            // TODO(jessehall): Improve error reporting. Can we enumerate
            // possible errors and translate them to valid Vulkan result codes?
            ALOGE("dequeueBuffer[%u] failed: %s (%d)", i, strerror(-err), err);
            result = VK_ERROR_INITIALIZATION_FAILED;
            break;
        }
        img.buffer = buffer;
        img.dequeued = true;

        image_create.extent =
            VkExtent3D{static_cast<uint32_t>(img.buffer->width),
                       static_cast<uint32_t>(img.buffer->height),
                       1};
        image_native_buffer.handle = img.buffer->handle;
        image_native_buffer.stride = img.buffer->stride;
        image_native_buffer.format = img.buffer->format;
        image_native_buffer.usage = img.buffer->usage;

        result =
            dispatch.CreateImage(device, &image_create, nullptr, &img.image);
        if (result != VK_SUCCESS) {
            ALOGD("vkCreateImage w/ native buffer failed: %u", result);
            break;
        }
    }

    // -- Cancel all buffers, returning them to the queue --
    // If an error occurred before, also destroy the VkImage and release the
    // buffer reference. Otherwise, we retain a strong reference to the buffer.
    //
    // TODO(jessehall): The error path here is the same as DestroySwapchain,
    // but not the non-error path. Should refactor/unify.
    for (uint32_t i = 0; i < num_images; i++) {
        Swapchain::Image& img = swapchain->images[i];
        if (img.dequeued) {
            surface.window->cancelBuffer(surface.window.get(), img.buffer.get(),
                                         img.dequeue_fence);
            img.dequeue_fence = -1;
            img.dequeued = false;
        }
        if (result != VK_SUCCESS) {
            if (img.image)
                dispatch.DestroyImage(device, img.image, nullptr);
        }
    }

    if (result != VK_SUCCESS) {
        swapchain->~Swapchain();
        allocator->pfnFree(allocator->pUserData, swapchain);
        return result;
    }

    surface.swapchain_handle = HandleFromSwapchain(swapchain);
    *swapchain_handle = surface.swapchain_handle;
    return VK_SUCCESS;
}

VKAPI_ATTR
void DestroySwapchainKHR(VkDevice device,
                         VkSwapchainKHR swapchain_handle,
                         const VkAllocationCallbacks* allocator) {
    const auto& dispatch = GetData(device).driver;
    Swapchain* swapchain = SwapchainFromHandle(swapchain_handle);
    if (!swapchain)
        return;
    bool active = swapchain->surface.swapchain_handle == swapchain_handle;
    ANativeWindow* window = active ? swapchain->surface.window.get() : nullptr;

    if (swapchain->frame_timestamps_enabled) {
        native_window_enable_frame_timestamps(window, false);
    }
    for (uint32_t i = 0; i < swapchain->num_images; i++)
        ReleaseSwapchainImage(device, window, -1, swapchain->images[i]);
    if (active)
        swapchain->surface.swapchain_handle = VK_NULL_HANDLE;
    if (!allocator)
        allocator = &GetData(device).allocator;
    swapchain->~Swapchain();
    allocator->pfnFree(allocator->pUserData, swapchain);
}

VKAPI_ATTR
VkResult GetSwapchainImagesKHR(VkDevice,
                               VkSwapchainKHR swapchain_handle,
                               uint32_t* count,
                               VkImage* images) {
    Swapchain& swapchain = *SwapchainFromHandle(swapchain_handle);
    ALOGW_IF(swapchain.surface.swapchain_handle != swapchain_handle,
             "getting images for non-active swapchain 0x%" PRIx64
             "; only dequeued image handles are valid",
             reinterpret_cast<uint64_t>(swapchain_handle));
    VkResult result = VK_SUCCESS;
    if (images) {
        uint32_t n = swapchain.num_images;
        if (*count < swapchain.num_images) {
            n = *count;
            result = VK_INCOMPLETE;
        }
        for (uint32_t i = 0; i < n; i++)
            images[i] = swapchain.images[i].image;
        *count = n;
    } else {
        *count = swapchain.num_images;
    }
    return result;
}

VKAPI_ATTR
VkResult AcquireNextImageKHR(VkDevice device,
                             VkSwapchainKHR swapchain_handle,
                             uint64_t timeout,
                             VkSemaphore semaphore,
                             VkFence vk_fence,
                             uint32_t* image_index) {
    Swapchain& swapchain = *SwapchainFromHandle(swapchain_handle);
    ANativeWindow* window = swapchain.surface.window.get();
    VkResult result;
    int err;

    if (swapchain.surface.swapchain_handle != swapchain_handle)
        return VK_ERROR_OUT_OF_DATE_KHR;

    ALOGW_IF(
        timeout != UINT64_MAX,
        "vkAcquireNextImageKHR: non-infinite timeouts not yet implemented");

    ANativeWindowBuffer* buffer;
    int fence_fd;
    err = window->dequeueBuffer(window, &buffer, &fence_fd);
    if (err != 0) {
        // TODO(jessehall): Improve error reporting. Can we enumerate possible
        // errors and translate them to valid Vulkan result codes?
        ALOGE("dequeueBuffer failed: %s (%d)", strerror(-err), err);
        return VK_ERROR_INITIALIZATION_FAILED;
    }

    uint32_t idx;
    for (idx = 0; idx < swapchain.num_images; idx++) {
        if (swapchain.images[idx].buffer.get() == buffer) {
            swapchain.images[idx].dequeued = true;
            swapchain.images[idx].dequeue_fence = fence_fd;
            break;
        }
    }
    if (idx == swapchain.num_images) {
        ALOGE("dequeueBuffer returned unrecognized buffer");
        window->cancelBuffer(window, buffer, fence_fd);
        return VK_ERROR_OUT_OF_DATE_KHR;
    }

    int fence_clone = -1;
    if (fence_fd != -1) {
        fence_clone = dup(fence_fd);
        if (fence_clone == -1) {
            ALOGE("dup(fence) failed, stalling until signalled: %s (%d)",
                  strerror(errno), errno);
            sync_wait(fence_fd, -1 /* forever */);
        }
    }

    result = GetData(device).driver.AcquireImageANDROID(
        device, swapchain.images[idx].image, fence_clone, semaphore, vk_fence);
    if (result != VK_SUCCESS) {
        // NOTE: we're relying on AcquireImageANDROID to close fence_clone,
        // even if the call fails. We could close it ourselves on failure, but
        // that would create a race condition if the driver closes it on a
        // failure path: some other thread might create an fd with the same
        // number between the time the driver closes it and the time we close
        // it. We must assume one of: the driver *always* closes it even on
        // failure, or *never* closes it on failure.
        window->cancelBuffer(window, buffer, fence_fd);
        swapchain.images[idx].dequeued = false;
        swapchain.images[idx].dequeue_fence = -1;
        return result;
    }

    *image_index = idx;
    return VK_SUCCESS;
}

static VkResult WorstPresentResult(VkResult a, VkResult b) {
    // See the error ranking for vkQueuePresentKHR at the end of section 29.6
    // (in spec version 1.0.14).
    static const VkResult kWorstToBest[] = {
        VK_ERROR_DEVICE_LOST,
        VK_ERROR_SURFACE_LOST_KHR,
        VK_ERROR_OUT_OF_DATE_KHR,
        VK_ERROR_OUT_OF_DEVICE_MEMORY,
        VK_ERROR_OUT_OF_HOST_MEMORY,
        VK_SUBOPTIMAL_KHR,
    };
    for (auto result : kWorstToBest) {
        if (a == result || b == result)
            return result;
    }
    ALOG_ASSERT(a == VK_SUCCESS, "invalid vkQueuePresentKHR result %d", a);
    ALOG_ASSERT(b == VK_SUCCESS, "invalid vkQueuePresentKHR result %d", b);
    return a != VK_SUCCESS ? a : b;
}

VKAPI_ATTR
VkResult QueuePresentKHR(VkQueue queue, const VkPresentInfoKHR* present_info) {
    ALOGV_IF(present_info->sType != VK_STRUCTURE_TYPE_PRESENT_INFO_KHR,
             "vkQueuePresentKHR: invalid VkPresentInfoKHR structure type %d",
             present_info->sType);

    VkDevice device = GetData(queue).driver_device;
    const auto& dispatch = GetData(queue).driver;
    VkResult final_result = VK_SUCCESS;

    // Look at the pNext chain for supported extension structs:
    const VkPresentRegionsKHR* present_regions = nullptr;
    const VkPresentTimesInfoGOOGLE* present_times = nullptr;
    const VkPresentRegionsKHR* next =
        reinterpret_cast<const VkPresentRegionsKHR*>(present_info->pNext);
    while (next) {
        switch (next->sType) {
            case VK_STRUCTURE_TYPE_PRESENT_REGIONS_KHR:
                present_regions = next;
                break;
            case VK_STRUCTURE_TYPE_PRESENT_TIMES_GOOGLE:
                present_times =
                    reinterpret_cast<const VkPresentTimesInfoGOOGLE*>(next);
                break;
            default:
                ALOGV("QueuePresentKHR ignoring unrecognized pNext->sType = %x",
                      next->sType);
                break;
        }
        next = reinterpret_cast<const VkPresentRegionsKHR*>(next->pNext);
    }
    ALOGV_IF(
        present_regions &&
            present_regions->swapchainCount != present_info->swapchainCount,
        "VkPresentRegions::swapchainCount != VkPresentInfo::swapchainCount");
    ALOGV_IF(present_times &&
                 present_times->swapchainCount != present_info->swapchainCount,
             "VkPresentTimesInfoGOOGLE::swapchainCount != "
             "VkPresentInfo::swapchainCount");
    const VkPresentRegionKHR* regions =
        (present_regions) ? present_regions->pRegions : nullptr;
    const VkPresentTimeGOOGLE* times =
        (present_times) ? present_times->pTimes : nullptr;
    const VkAllocationCallbacks* allocator = &GetData(device).allocator;
    android_native_rect_t* rects = nullptr;
    uint32_t nrects = 0;

    for (uint32_t sc = 0; sc < present_info->swapchainCount; sc++) {
        Swapchain& swapchain =
            *SwapchainFromHandle(present_info->pSwapchains[sc]);
        uint32_t image_idx = present_info->pImageIndices[sc];
        Swapchain::Image& img = swapchain.images[image_idx];
        const VkPresentRegionKHR* region = (regions) ? &regions[sc] : nullptr;
        const VkPresentTimeGOOGLE* time = (times) ? &times[sc] : nullptr;
        VkResult swapchain_result = VK_SUCCESS;
        VkResult result;
        int err;

        int fence = -1;
        result = dispatch.QueueSignalReleaseImageANDROID(
            queue, present_info->waitSemaphoreCount,
            present_info->pWaitSemaphores, img.image, &fence);
        if (result != VK_SUCCESS) {
            ALOGE("QueueSignalReleaseImageANDROID failed: %d", result);
            swapchain_result = result;
        }

        if (swapchain.surface.swapchain_handle ==
            present_info->pSwapchains[sc]) {
            ANativeWindow* window = swapchain.surface.window.get();
            if (swapchain_result == VK_SUCCESS) {
                if (region) {
                    // Process the incremental-present hint for this swapchain:
                    uint32_t rcount = region->rectangleCount;
                    if (rcount > nrects) {
                        android_native_rect_t* new_rects =
                            static_cast<android_native_rect_t*>(
                                allocator->pfnReallocation(
                                    allocator->pUserData, rects,
                                    sizeof(android_native_rect_t) * rcount,
                                    alignof(android_native_rect_t),
                                    VK_SYSTEM_ALLOCATION_SCOPE_COMMAND));
                        if (new_rects) {
                            rects = new_rects;
                            nrects = rcount;
                        } else {
                            rcount = 0;  // Ignore the hint for this swapchain
                        }
                    }
                    for (uint32_t r = 0; r < rcount; ++r) {
                        if (region->pRectangles[r].layer > 0) {
                            ALOGV(
                                "vkQueuePresentKHR ignoring invalid layer "
                                "(%u); using layer 0 instead",
                                region->pRectangles[r].layer);
                        }
                        int x = region->pRectangles[r].offset.x;
                        int y = region->pRectangles[r].offset.y;
                        int width = static_cast<int>(
                            region->pRectangles[r].extent.width);
                        int height = static_cast<int>(
                            region->pRectangles[r].extent.height);
                        android_native_rect_t* cur_rect = &rects[r];
                        cur_rect->left = x;
                        cur_rect->top = y + height;
                        cur_rect->right = x + width;
                        cur_rect->bottom = y;
                    }
                    native_window_set_surface_damage(window, rects, rcount);
                }
                if (time) {
                    if (!swapchain.frame_timestamps_enabled) {
                        ALOGV(
                            "Calling "
                            "native_window_enable_frame_timestamps(true)");
                        native_window_enable_frame_timestamps(window, true);
                        swapchain.frame_timestamps_enabled = true;
                    }
                    // Record this presentID and desiredPresentTime so it can
                    // be later correlated to this present.
                    TimingInfo timing_record(time);
                    swapchain.timing.add(timing_record);
                    uint32_t num_timings =
                        static_cast<uint32_t>(swapchain.timing.size());
                    if (num_timings > MAX_TIMING_INFOS) {
                        swapchain.timing.removeAt(0);
                    }
                    if (time->desiredPresentTime) {
                        // Set the desiredPresentTime:
                        ALOGV(
                            "Calling "
                            "native_window_set_buffers_timestamp(%" PRId64 ")",
                            time->desiredPresentTime);
                        native_window_set_buffers_timestamp(
                            window,
                            static_cast<int64_t>(time->desiredPresentTime));
                    }
                }
                err = window->queueBuffer(window, img.buffer.get(), fence);
                // queueBuffer always closes fence, even on error
                if (err != 0) {
                    // TODO(jessehall): What now? We should probably cancel the
                    // buffer, I guess?
                    ALOGE("queueBuffer failed: %s (%d)", strerror(-err), err);
                    swapchain_result = WorstPresentResult(
                        swapchain_result, VK_ERROR_OUT_OF_DATE_KHR);
                }
                if (img.dequeue_fence >= 0) {
                    close(img.dequeue_fence);
                    img.dequeue_fence = -1;
                }
                img.dequeued = false;
            }
            if (swapchain_result != VK_SUCCESS) {
                ReleaseSwapchainImage(device, window, fence, img);
                OrphanSwapchain(device, &swapchain);
            }
        } else {
            ReleaseSwapchainImage(device, nullptr, fence, img);
            swapchain_result = VK_ERROR_OUT_OF_DATE_KHR;
        }

        if (present_info->pResults)
            present_info->pResults[sc] = swapchain_result;

        if (swapchain_result != final_result)
            final_result = WorstPresentResult(final_result, swapchain_result);
    }
    if (rects) {
        allocator->pfnFree(allocator->pUserData, rects);
    }

    return final_result;
}

VKAPI_ATTR
VkResult GetRefreshCycleDurationGOOGLE(
    VkDevice,
    VkSwapchainKHR,
    VkRefreshCycleDurationGOOGLE* pDisplayTimingProperties) {
    VkResult result = VK_SUCCESS;

    // TODO(ianelliott): FULLY IMPLEMENT THIS FUNCTION!!!
    pDisplayTimingProperties->minRefreshDuration = 16666666;
    pDisplayTimingProperties->maxRefreshDuration = 16666666;

    return result;
}

VKAPI_ATTR
VkResult GetPastPresentationTimingGOOGLE(
    VkDevice,
    VkSwapchainKHR swapchain_handle,
    uint32_t* count,
    VkPastPresentationTimingGOOGLE* timings) {
    Swapchain& swapchain = *SwapchainFromHandle(swapchain_handle);
    ANativeWindow* window = swapchain.surface.window.get();
    VkResult result = VK_SUCCESS;

    if (!swapchain.frame_timestamps_enabled) {
        ALOGV("Calling native_window_enable_frame_timestamps(true)");
        native_window_enable_frame_timestamps(window, true);
        swapchain.frame_timestamps_enabled = true;
    }

    if (timings) {
        // TODO(ianelliott): plumb return value (e.g. VK_INCOMPLETE)
        copy_ready_timings(swapchain, count, timings);
    } else {
        *count = get_num_ready_timings(swapchain);
    }

    return result;
}

VKAPI_ATTR
VkResult GetSwapchainStatusKHR(
    VkDevice,
    VkSwapchainKHR) {
    VkResult result = VK_SUCCESS;

    // TODO(chrisforbes): Implement this function properly

    return result;
}

}  // namespace driver
}  // namespace vulkan