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renderer_vulkan: Use VMA for buffers

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This commit is contained in:
GPUCode 2023-05-27 17:09:17 +03:00
parent 48e39756f1
commit 7b2f680468
16 changed files with 262 additions and 211 deletions
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9
src/video_core/renderer_vulkan/renderer_vulkan.cpp
View file

@ -233,8 +233,8 @@ void Vulkan::RendererVulkan::RenderScreenshot(const Tegra::FramebufferConfig& fr
.queueFamilyIndexCount = 0,
.pQueueFamilyIndices = nullptr,
};
const vk::Buffer dst_buffer = device.GetLogical().CreateBuffer(dst_buffer_info);
MemoryCommit dst_buffer_memory = memory_allocator.Commit(dst_buffer, MemoryUsage::Download);
const vk::Buffer dst_buffer =
memory_allocator.CreateBuffer(dst_buffer_info, MemoryUsage::Download);
scheduler.RequestOutsideRenderPassOperationContext();
scheduler.Record([&](vk::CommandBuffer cmdbuf) {
@ -308,8 +308,9 @@ void Vulkan::RendererVulkan::RenderScreenshot(const Tegra::FramebufferConfig& fr
scheduler.Finish();
// Copy backing image data to the QImage screenshot buffer
const auto dst_memory_map = dst_buffer_memory.Map();
std::memcpy(renderer_settings.screenshot_bits, dst_memory_map.data(), dst_memory_map.size());
dst_buffer.Invalidate();
std::memcpy(renderer_settings.screenshot_bits, dst_buffer.Mapped().data(),
dst_buffer.Mapped().size());
renderer_settings.screenshot_complete_callback(false);
renderer_settings.screenshot_requested = false;
}

6
src/video_core/renderer_vulkan/vk_blit_screen.cpp
View file

@ -162,7 +162,7 @@ void BlitScreen::Draw(const Tegra::FramebufferConfig& framebuffer,
SetUniformData(data, layout);
SetVertexData(data, framebuffer, layout);
const std::span<u8> mapped_span = buffer_commit.Map();
const std::span<u8> mapped_span = buffer.Mapped();
std::memcpy(mapped_span.data(), &data, sizeof(data));
if (!use_accelerated) {
@ -1074,7 +1074,6 @@ void BlitScreen::ReleaseRawImages() {
aa_image_view.reset();
aa_image.reset();
buffer.reset();
buffer_commit = MemoryCommit{};
}
void BlitScreen::CreateStagingBuffer(const Tegra::FramebufferConfig& framebuffer) {
@ -1090,8 +1089,7 @@ void BlitScreen::CreateStagingBuffer(const Tegra::FramebufferConfig& framebuffer
.pQueueFamilyIndices = nullptr,
};
buffer = device.GetLogical().CreateBuffer(ci);
buffer_commit = memory_allocator.Commit(buffer, MemoryUsage::Upload);
buffer = memory_allocator.CreateBuffer(ci, MemoryUsage::Upload);
}
void BlitScreen::CreateRawImages(const Tegra::FramebufferConfig& framebuffer) {

1
src/video_core/renderer_vulkan/vk_blit_screen.h
View file

@ -142,7 +142,6 @@ private:
vk::Sampler sampler;
vk::Buffer buffer;
MemoryCommit buffer_commit;
std::vector<u64> resource_ticks;

81
src/video_core/renderer_vulkan/vk_buffer_cache.cpp
View file

@ -50,7 +50,7 @@ size_t BytesPerIndex(VkIndexType index_type) {
}
}
vk::Buffer CreateBuffer(const Device& device, u64 size) {
vk::Buffer CreateBuffer(const Device& device, const MemoryAllocator& memory_allocator, u64 size) {
VkBufferUsageFlags flags =
VK_BUFFER_USAGE_TRANSFER_SRC_BIT | VK_BUFFER_USAGE_TRANSFER_DST_BIT |
VK_BUFFER_USAGE_UNIFORM_TEXEL_BUFFER_BIT | VK_BUFFER_USAGE_STORAGE_TEXEL_BUFFER_BIT |
@ -60,7 +60,7 @@ vk::Buffer CreateBuffer(const Device& device, u64 size) {
if (device.IsExtTransformFeedbackSupported()) {
flags |= VK_BUFFER_USAGE_TRANSFORM_FEEDBACK_BUFFER_BIT_EXT;
}
return device.GetLogical().CreateBuffer({
const VkBufferCreateInfo buffer_ci = {
.sType = VK_STRUCTURE_TYPE_BUFFER_CREATE_INFO,
.pNext = nullptr,
.flags = 0,
@ -69,7 +69,8 @@ vk::Buffer CreateBuffer(const Device& device, u64 size) {
.sharingMode = VK_SHARING_MODE_EXCLUSIVE,
.queueFamilyIndexCount = 0,
.pQueueFamilyIndices = nullptr,
});
};
return memory_allocator.CreateBuffer(buffer_ci, MemoryUsage::DeviceLocal);
}
} // Anonymous namespace
@ -79,8 +80,8 @@ Buffer::Buffer(BufferCacheRuntime&, VideoCommon::NullBufferParams null_params)
Buffer::Buffer(BufferCacheRuntime& runtime, VideoCore::RasterizerInterface& rasterizer_,
VAddr cpu_addr_, u64 size_bytes_)
: VideoCommon::BufferBase<VideoCore::RasterizerInterface>(rasterizer_, cpu_addr_, size_bytes_),
device{&runtime.device}, buffer{CreateBuffer(*device, SizeBytes())},
commit{runtime.memory_allocator.Commit(buffer, MemoryUsage::DeviceLocal)} {
device{&runtime.device}, buffer{
CreateBuffer(*device, runtime.memory_allocator, SizeBytes())} {
if (runtime.device.HasDebuggingToolAttached()) {
buffer.SetObjectNameEXT(fmt::format("Buffer 0x{:x}", CpuAddr()).c_str());
}
@ -138,7 +139,7 @@ public:
const u32 num_first_offset_copies = 4;
const size_t bytes_per_index = BytesPerIndex(index_type);
const size_t size_bytes = num_triangle_indices * bytes_per_index * num_first_offset_copies;
buffer = device.GetLogical().CreateBuffer(VkBufferCreateInfo{
const VkBufferCreateInfo buffer_ci = {
.sType = VK_STRUCTURE_TYPE_BUFFER_CREATE_INFO,
.pNext = nullptr,
.flags = 0,
@ -147,14 +148,21 @@ public:
.sharingMode = VK_SHARING_MODE_EXCLUSIVE,
.queueFamilyIndexCount = 0,
.pQueueFamilyIndices = nullptr,
});
};
buffer = memory_allocator.CreateBuffer(buffer_ci, MemoryUsage::DeviceLocal);
if (device.HasDebuggingToolAttached()) {
buffer.SetObjectNameEXT("Quad LUT");
}
memory_commit = memory_allocator.Commit(buffer, MemoryUsage::DeviceLocal);
const StagingBufferRef staging = staging_pool.Request(size_bytes, MemoryUsage::Upload);
u8* staging_data = staging.mapped_span.data();
const bool host_visible = buffer.IsHostVisible();
const StagingBufferRef staging = [&] {
if (host_visible) {
return StagingBufferRef{};
}
return staging_pool.Request(size_bytes, MemoryUsage::Upload);
}();
u8* staging_data = host_visible ? buffer.Mapped().data() : staging.mapped_span.data();
const size_t quad_size = bytes_per_index * 6;
for (u32 first = 0; first < num_first_offset_copies; ++first) {
@ -164,29 +172,33 @@ public:
}
}
scheduler.RequestOutsideRenderPassOperationContext();
scheduler.Record([src_buffer = staging.buffer, src_offset = staging.offset,
dst_buffer = *buffer, size_bytes](vk::CommandBuffer cmdbuf) {
const VkBufferCopy copy{
.srcOffset = src_offset,
.dstOffset = 0,
.size = size_bytes,
};
const VkBufferMemoryBarrier write_barrier{
.sType = VK_STRUCTURE_TYPE_BUFFER_MEMORY_BARRIER,
.pNext = nullptr,
.srcAccessMask = VK_ACCESS_TRANSFER_WRITE_BIT,
.dstAccessMask = VK_ACCESS_INDEX_READ_BIT,
.srcQueueFamilyIndex = VK_QUEUE_FAMILY_IGNORED,
.dstQueueFamilyIndex = VK_QUEUE_FAMILY_IGNORED,
.buffer = dst_buffer,
.offset = 0,
.size = size_bytes,
};
cmdbuf.CopyBuffer(src_buffer, dst_buffer, copy);
cmdbuf.PipelineBarrier(VK_PIPELINE_STAGE_TRANSFER_BIT,
VK_PIPELINE_STAGE_VERTEX_INPUT_BIT, 0, write_barrier);
});
if (!host_visible) {
scheduler.RequestOutsideRenderPassOperationContext();
scheduler.Record([src_buffer = staging.buffer, src_offset = staging.offset,
dst_buffer = *buffer, size_bytes](vk::CommandBuffer cmdbuf) {
const VkBufferCopy copy{
.srcOffset = src_offset,
.dstOffset = 0,
.size = size_bytes,
};
const VkBufferMemoryBarrier write_barrier{
.sType = VK_STRUCTURE_TYPE_BUFFER_MEMORY_BARRIER,
.pNext = nullptr,
.srcAccessMask = VK_ACCESS_TRANSFER_WRITE_BIT,
.dstAccessMask = VK_ACCESS_INDEX_READ_BIT,
.srcQueueFamilyIndex = VK_QUEUE_FAMILY_IGNORED,
.dstQueueFamilyIndex = VK_QUEUE_FAMILY_IGNORED,
.buffer = dst_buffer,
.offset = 0,
.size = size_bytes,
};
cmdbuf.CopyBuffer(src_buffer, dst_buffer, copy);
cmdbuf.PipelineBarrier(VK_PIPELINE_STAGE_TRANSFER_BIT,
VK_PIPELINE_STAGE_VERTEX_INPUT_BIT, 0, write_barrier);
});
} else {
buffer.Flush();
}
}
void BindBuffer(u32 first) {
@ -587,11 +599,10 @@ void BufferCacheRuntime::ReserveNullBuffer() {
create_info.usage |= VK_BUFFER_USAGE_TRANSFORM_FEEDBACK_BUFFER_BIT_EXT;
}
create_info.usage |= VK_BUFFER_USAGE_INDIRECT_BUFFER_BIT;
null_buffer = device.GetLogical().CreateBuffer(create_info);
null_buffer = memory_allocator.CreateBuffer(create_info, MemoryUsage::DeviceLocal);
if (device.HasDebuggingToolAttached()) {
null_buffer.SetObjectNameEXT("Null buffer");
}
null_buffer_commit = memory_allocator.Commit(null_buffer, MemoryUsage::DeviceLocal);
scheduler.RequestOutsideRenderPassOperationContext();
scheduler.Record([buffer = *null_buffer](vk::CommandBuffer cmdbuf) {

2
src/video_core/renderer_vulkan/vk_buffer_cache.h
View file

@ -48,7 +48,6 @@ private:
const Device* device{};
vk::Buffer buffer;
MemoryCommit commit;
std::vector<BufferView> views;
};
@ -142,7 +141,6 @@ private:
std::shared_ptr<QuadStripIndexBuffer> quad_strip_index_buffer;
vk::Buffer null_buffer;
MemoryCommit null_buffer_commit;
std::unique_ptr<Uint8Pass> uint8_pass;
QuadIndexedPass quad_index_pass;

12
src/video_core/renderer_vulkan/vk_smaa.cpp
View file

@ -76,7 +76,7 @@ void TransitionImageLayout(vk::CommandBuffer& cmdbuf, VkImage image, VkImageLayo
void UploadImage(const Device& device, MemoryAllocator& allocator, Scheduler& scheduler,
vk::Image& image, VkExtent2D dimensions, VkFormat format,
std::span<const u8> initial_contents = {}) {
auto upload_buffer = device.GetLogical().CreateBuffer(VkBufferCreateInfo{
const VkBufferCreateInfo upload_ci = {
.sType = VK_STRUCTURE_TYPE_BUFFER_CREATE_INFO,
.pNext = nullptr,
.flags = 0,
@ -85,9 +85,10 @@ void UploadImage(const Device& device, MemoryAllocator& allocator, Scheduler& sc
.sharingMode = VK_SHARING_MODE_EXCLUSIVE,
.queueFamilyIndexCount = 0,
.pQueueFamilyIndices = nullptr,
});
auto upload_commit = allocator.Commit(upload_buffer, MemoryUsage::Upload);
std::ranges::copy(initial_contents, upload_commit.Map().begin());
};
auto upload_buffer = allocator.CreateBuffer(upload_ci, MemoryUsage::Upload);
std::ranges::copy(initial_contents, upload_buffer.Mapped().begin());
upload_buffer.Flush();
const std::array<VkBufferImageCopy, 1> regions{{{
.bufferOffset = 0,
@ -111,9 +112,6 @@ void UploadImage(const Device& device, MemoryAllocator& allocator, Scheduler& sc
VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL);
});
scheduler.Finish();
// This should go out of scope before the commit
auto upload_buffer2 = std::move(upload_buffer);
}
vk::ImageView CreateWrappedImageView(const Device& device, vk::Image& image, VkFormat format) {

105
src/video_core/renderer_vulkan/vk_staging_buffer_pool.cpp
View file

@ -30,55 +30,6 @@ constexpr VkDeviceSize MAX_STREAM_BUFFER_REQUEST_SIZE = 8_MiB;
constexpr VkDeviceSize STREAM_BUFFER_SIZE = 128_MiB;
constexpr VkDeviceSize REGION_SIZE = STREAM_BUFFER_SIZE / StagingBufferPool::NUM_SYNCS;
constexpr VkMemoryPropertyFlags HOST_FLAGS =
VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT;
constexpr VkMemoryPropertyFlags STREAM_FLAGS = VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT | HOST_FLAGS;
bool IsStreamHeap(VkMemoryHeap heap) noexcept {
return STREAM_BUFFER_SIZE < (heap.size * 2) / 3;
}
std::optional<u32> FindMemoryTypeIndex(const VkPhysicalDeviceMemoryProperties& props, u32 type_mask,
VkMemoryPropertyFlags flags) noexcept {
for (u32 type_index = 0; type_index < props.memoryTypeCount; ++type_index) {
if (((type_mask >> type_index) & 1) == 0) {
// Memory type is incompatible
continue;
}
const VkMemoryType& memory_type = props.memoryTypes[type_index];
if ((memory_type.propertyFlags & flags) != flags) {
// Memory type doesn't have the flags we want
continue;
}
if (!IsStreamHeap(props.memoryHeaps[memory_type.heapIndex])) {
// Memory heap is not suitable for streaming
continue;
}
// Success!
return type_index;
}
return std::nullopt;
}
u32 FindMemoryTypeIndex(const VkPhysicalDeviceMemoryProperties& props, u32 type_mask,
bool try_device_local) {
std::optional<u32> type;
if (try_device_local) {
// Try to find a DEVICE_LOCAL_BIT type, Nvidia and AMD have a dedicated heap for this
type = FindMemoryTypeIndex(props, type_mask, STREAM_FLAGS);
if (type) {
return *type;
}
}
// Otherwise try without the DEVICE_LOCAL_BIT
type = FindMemoryTypeIndex(props, type_mask, HOST_FLAGS);
if (type) {
return *type;
}
// This should never happen, and in case it does, signal it as an out of memory situation
throw vk::Exception(VK_ERROR_OUT_OF_DEVICE_MEMORY);
}
size_t Region(size_t iterator) noexcept {
return iterator / REGION_SIZE;
}
@ -87,8 +38,7 @@ size_t Region(size_t iterator) noexcept {
StagingBufferPool::StagingBufferPool(const Device& device_, MemoryAllocator& memory_allocator_,
Scheduler& scheduler_)
: device{device_}, memory_allocator{memory_allocator_}, scheduler{scheduler_} {
const vk::Device& dev = device.GetLogical();
stream_buffer = dev.CreateBuffer(VkBufferCreateInfo{
const VkBufferCreateInfo stream_ci = {
.sType = VK_STRUCTURE_TYPE_BUFFER_CREATE_INFO,
.pNext = nullptr,
.flags = 0,
@ -99,46 +49,13 @@ StagingBufferPool::StagingBufferPool(const Device& device_, MemoryAllocator& mem
.sharingMode = VK_SHARING_MODE_EXCLUSIVE,
.queueFamilyIndexCount = 0,
.pQueueFamilyIndices = nullptr,
});
};
stream_buffer = memory_allocator.CreateBuffer(stream_ci, MemoryUsage::Stream);
if (device.HasDebuggingToolAttached()) {
stream_buffer.SetObjectNameEXT("Stream Buffer");
}
VkMemoryDedicatedRequirements dedicated_reqs{
.sType = VK_STRUCTURE_TYPE_MEMORY_DEDICATED_REQUIREMENTS,
.pNext = nullptr,
.prefersDedicatedAllocation = VK_FALSE,
.requiresDedicatedAllocation = VK_FALSE,
};
const auto requirements = dev.GetBufferMemoryRequirements(*stream_buffer, &dedicated_reqs);
const bool make_dedicated = dedicated_reqs.prefersDedicatedAllocation == VK_TRUE ||
dedicated_reqs.requiresDedicatedAllocation == VK_TRUE;
const VkMemoryDedicatedAllocateInfo dedicated_info{
.sType = VK_STRUCTURE_TYPE_MEMORY_DEDICATED_ALLOCATE_INFO,
.pNext = nullptr,
.image = nullptr,
.buffer = *stream_buffer,
};
const auto memory_properties = device.GetPhysical().GetMemoryProperties().memoryProperties;
VkMemoryAllocateInfo stream_memory_info{
.sType = VK_STRUCTURE_TYPE_MEMORY_ALLOCATE_INFO,
.pNext = make_dedicated ? &dedicated_info : nullptr,
.allocationSize = requirements.size,
.memoryTypeIndex =
FindMemoryTypeIndex(memory_properties, requirements.memoryTypeBits, true),
};
stream_memory = dev.TryAllocateMemory(stream_memory_info);
if (!stream_memory) {
LOG_INFO(Render_Vulkan, "Dynamic memory allocation failed, trying with system memory");
stream_memory_info.memoryTypeIndex =
FindMemoryTypeIndex(memory_properties, requirements.memoryTypeBits, false);
stream_memory = dev.AllocateMemory(stream_memory_info);
}
if (device.HasDebuggingToolAttached()) {
stream_memory.SetObjectNameEXT("Stream Buffer Memory");
}
stream_buffer.BindMemory(*stream_memory, 0);
stream_pointer = stream_memory.Map(0, STREAM_BUFFER_SIZE);
stream_pointer = stream_buffer.Mapped();
ASSERT_MSG(!stream_pointer.empty(), "Stream buffer must be host visible!");
}
StagingBufferPool::~StagingBufferPool() = default;
@ -199,7 +116,7 @@ StagingBufferRef StagingBufferPool::GetStreamBuffer(size_t size) {
return StagingBufferRef{
.buffer = *stream_buffer,
.offset = static_cast<VkDeviceSize>(offset),
.mapped_span = std::span<u8>(stream_pointer + offset, size),
.mapped_span = stream_pointer.subspan(offset, size),
.usage{},
.log2_level{},
.index{},
@ -247,7 +164,7 @@ std::optional<StagingBufferRef> StagingBufferPool::TryGetReservedBuffer(size_t s
StagingBufferRef StagingBufferPool::CreateStagingBuffer(size_t size, MemoryUsage usage,
bool deferred) {
const u32 log2 = Common::Log2Ceil64(size);
vk::Buffer buffer = device.GetLogical().CreateBuffer({
const VkBufferCreateInfo buffer_ci = {
.sType = VK_STRUCTURE_TYPE_BUFFER_CREATE_INFO,
.pNext = nullptr,
.flags = 0,
@ -259,17 +176,15 @@ StagingBufferRef StagingBufferPool::CreateStagingBuffer(size_t size, MemoryUsage
.sharingMode = VK_SHARING_MODE_EXCLUSIVE,
.queueFamilyIndexCount = 0,
.pQueueFamilyIndices = nullptr,
});
};
vk::Buffer buffer = memory_allocator.CreateBuffer(buffer_ci, usage);
if (device.HasDebuggingToolAttached()) {
++buffer_index;
buffer.SetObjectNameEXT(fmt::format("Staging Buffer {}", buffer_index).c_str());
}
MemoryCommit commit = memory_allocator.Commit(buffer, usage);
const std::span<u8> mapped_span = IsHostVisible(usage) ? commit.Map() : std::span<u8>{};
const std::span<u8> mapped_span = buffer.Mapped();
StagingBuffer& entry = GetCache(usage)[log2].entries.emplace_back(StagingBuffer{
.buffer = std::move(buffer),
.commit = std::move(commit),
.mapped_span = mapped_span,
.usage = usage,
.log2_level = log2,

4
src/video_core/renderer_vulkan/vk_staging_buffer_pool.h
View file

@ -46,7 +46,6 @@ private:
struct StagingBuffer {
vk::Buffer buffer;
MemoryCommit commit;
std::span<u8> mapped_span;
MemoryUsage usage;
u32 log2_level;
@ -97,8 +96,7 @@ private:
Scheduler& scheduler;
vk::Buffer stream_buffer;
vk::DeviceMemory stream_memory;
u8* stream_pointer = nullptr;
std::span<u8> stream_pointer;
size_t iterator = 0;
size_t used_iterator = 0;

9
src/video_core/renderer_vulkan/vk_texture_cache.cpp
View file

@ -839,14 +839,14 @@ bool TextureCacheRuntime::ShouldReinterpret(Image& dst, Image& src) {
VkBuffer TextureCacheRuntime::GetTemporaryBuffer(size_t needed_size) {
const auto level = (8 * sizeof(size_t)) - std::countl_zero(needed_size - 1ULL);
if (buffer_commits[level]) {
if (buffers[level]) {
return *buffers[level];
}
const auto new_size = Common::NextPow2(needed_size);
static constexpr VkBufferUsageFlags flags =
VK_BUFFER_USAGE_TRANSFER_SRC_BIT | VK_BUFFER_USAGE_TRANSFER_DST_BIT |
VK_BUFFER_USAGE_UNIFORM_TEXEL_BUFFER_BIT | VK_BUFFER_USAGE_STORAGE_TEXEL_BUFFER_BIT;
buffers[level] = device.GetLogical().CreateBuffer({
const VkBufferCreateInfo temp_ci = {
.sType = VK_STRUCTURE_TYPE_BUFFER_CREATE_INFO,
.pNext = nullptr,
.flags = 0,
@ -855,9 +855,8 @@ VkBuffer TextureCacheRuntime::GetTemporaryBuffer(size_t needed_size) {
.sharingMode = VK_SHARING_MODE_EXCLUSIVE,
.queueFamilyIndexCount = 0,
.pQueueFamilyIndices = nullptr,
});
buffer_commits[level] = std::make_unique<MemoryCommit>(
memory_allocator.Commit(buffers[level], MemoryUsage::DeviceLocal));
};
buffers[level] = memory_allocator.CreateBuffer(temp_ci, MemoryUsage::DeviceLocal);
return *buffers[level];
}

1
src/video_core/renderer_vulkan/vk_texture_cache.h
View file

@ -116,7 +116,6 @@ public:
static constexpr size_t indexing_slots = 8 * sizeof(size_t);
std::array<vk::Buffer, indexing_slots> buffers{};
std::array<std::unique_ptr<MemoryCommit>, indexing_slots> buffer_commits{};
};
class Image : public VideoCommon::ImageBase {

8
src/video_core/renderer_vulkan/vk_turbo_mode.cpp
View file

@ -41,7 +41,7 @@ void TurboMode::Run(std::stop_token stop_token) {
auto& dld = m_device.GetLogical();
// Allocate buffer. 2MiB should be sufficient.
auto buffer = dld.CreateBuffer(VkBufferCreateInfo{
const VkBufferCreateInfo buffer_ci = {
.sType = VK_STRUCTURE_TYPE_BUFFER_CREATE_INFO,
.pNext = nullptr,
.flags = 0,
@ -50,10 +50,8 @@ void TurboMode::Run(std::stop_token stop_token) {
.sharingMode = VK_SHARING_MODE_EXCLUSIVE,
.queueFamilyIndexCount = 0,
.pQueueFamilyIndices = nullptr,
});
// Commit some device local memory for the buffer.
auto commit = m_allocator.Commit(buffer, MemoryUsage::DeviceLocal);
};
vk::Buffer buffer = m_allocator.CreateBuffer(buffer_ci, MemoryUsage::DeviceLocal);
// Create the descriptor pool to contain our descriptor.
static constexpr VkDescriptorPoolSize pool_size{