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early-access version 1335

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pineappleEA
2021-01-18 00:31:15 +01:00
parent 2a0ecc5567
commit 2b31de3238
36 changed files with 531 additions and 341 deletions
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17
src/video_core/renderer_vulkan/vk_buffer_cache.cpp
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@@ -138,17 +138,18 @@ void BufferCacheRuntime::CopyBuffer(VkBuffer dst_buffer, VkBuffer src_buffer,
void BufferCacheRuntime::BindIndexBuffer(PrimitiveTopology topology, IndexFormat index_format,
u32 base_vertex, u32 num_indices, VkBuffer buffer,
u32 offset, [[maybe_unused]] u32 size) {
VkIndexType index_type = MaxwellToVK::IndexFormat(index_format);
VkIndexType vk_index_type = MaxwellToVK::IndexFormat(index_format);
VkDeviceSize vk_offset = offset;
if (topology == PrimitiveTopology::Quads) {
index_type = VK_INDEX_TYPE_UINT32;
std::tie(buffer, offset) =
vk_index_type = VK_INDEX_TYPE_UINT32;
std::tie(buffer, vk_offset) =
quad_index_pass.Assemble(index_format, num_indices, base_vertex, buffer, offset);
} else if (index_type == VK_INDEX_TYPE_UINT8_EXT && !device.IsExtIndexTypeUint8Supported()) {
index_type = VK_INDEX_TYPE_UINT16;
std::tie(buffer, offset) = uint8_pass.Assemble(num_indices, buffer, offset);
} else if (vk_index_type == VK_INDEX_TYPE_UINT8_EXT && !device.IsExtIndexTypeUint8Supported()) {
vk_index_type = VK_INDEX_TYPE_UINT16;
std::tie(buffer, vk_offset) = uint8_pass.Assemble(num_indices, buffer, offset);
}
scheduler.Record([buffer, offset, index_type](vk::CommandBuffer cmdbuf) {
cmdbuf.BindIndexBuffer(buffer, offset, index_type);
scheduler.Record([buffer, vk_offset, vk_index_type](vk::CommandBuffer cmdbuf) {
cmdbuf.BindIndexBuffer(buffer, vk_offset, vk_index_type);
});
}

7
src/video_core/renderer_vulkan/vk_buffer_cache.h
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@@ -69,6 +69,13 @@ public:
void BindTransformFeedbackBuffer(u32 index, VkBuffer buffer, u32 offset, u32 size);
std::span<u8> BindMappedUniformBuffer([[maybe_unused]] size_t stage,
[[maybe_unused]] u32 binding_index, u32 size) {
const StagingBufferRef ref = staging_pool.Request(size, MemoryUsage::Upload);
BindBuffer(ref.buffer, static_cast<u32>(ref.offset), size);
return ref.mapped_span;
}
void BindUniformBuffer(VkBuffer buffer, u32 offset, u32 size) {
BindBuffer(buffer, offset, size);
}

61
src/video_core/renderer_vulkan/vk_compute_pass.cpp
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@@ -10,6 +10,7 @@
#include "common/alignment.h"
#include "common/assert.h"
#include "common/common_types.h"
#include "common/div_ceil.h"
#include "video_core/host_shaders/vulkan_quad_indexed_comp_spv.h"
#include "video_core/host_shaders/vulkan_uint8_comp_spv.h"
#include "video_core/renderer_vulkan/vk_compute_pass.h"
@@ -148,38 +149,33 @@ Uint8Pass::Uint8Pass(const Device& device, VKScheduler& scheduler_,
Uint8Pass::~Uint8Pass() = default;
std::pair<VkBuffer, u32> Uint8Pass::Assemble(u32 num_vertices, VkBuffer src_buffer,
u32 src_offset) {
std::pair<VkBuffer, VkDeviceSize> Uint8Pass::Assemble(u32 num_vertices, VkBuffer src_buffer,
u32 src_offset) {
const u32 staging_size = static_cast<u32>(num_vertices * sizeof(u16));
const auto staging = staging_buffer_pool.Request(staging_size, MemoryUsage::DeviceLocal);
update_descriptor_queue.Acquire();
update_descriptor_queue.AddBuffer(src_buffer, src_offset, num_vertices);
update_descriptor_queue.AddBuffer(staging.buffer, 0, staging_size);
update_descriptor_queue.AddBuffer(staging.buffer, staging.offset, staging_size);
const VkDescriptorSet set = CommitDescriptorSet(update_descriptor_queue);
scheduler.RequestOutsideRenderPassOperationContext();
scheduler.Record([layout = *layout, pipeline = *pipeline, buffer = staging.buffer, set,
num_vertices](vk::CommandBuffer cmdbuf) {
constexpr u32 dispatch_size = 1024;
static constexpr u32 DISPATCH_SIZE = 1024;
static constexpr VkMemoryBarrier WRITE_BARRIER{
.sType = VK_STRUCTURE_TYPE_MEMORY_BARRIER,
.pNext = nullptr,
.srcAccessMask = VK_ACCESS_SHADER_WRITE_BIT,
.dstAccessMask = VK_ACCESS_VERTEX_ATTRIBUTE_READ_BIT,
};
cmdbuf.BindPipeline(VK_PIPELINE_BIND_POINT_COMPUTE, pipeline);
cmdbuf.BindDescriptorSets(VK_PIPELINE_BIND_POINT_COMPUTE, layout, 0, set, {});
cmdbuf.Dispatch(Common::AlignUp(num_vertices, dispatch_size) / dispatch_size, 1, 1);
VkBufferMemoryBarrier barrier;
barrier.sType = VK_STRUCTURE_TYPE_BUFFER_MEMORY_BARRIER;
barrier.pNext = nullptr;
barrier.srcAccessMask = VK_ACCESS_SHADER_WRITE_BIT;
barrier.dstAccessMask = VK_ACCESS_VERTEX_ATTRIBUTE_READ_BIT;
barrier.srcQueueFamilyIndex = VK_QUEUE_FAMILY_IGNORED;
barrier.dstQueueFamilyIndex = VK_QUEUE_FAMILY_IGNORED;
barrier.buffer = buffer;
barrier.offset = 0;
barrier.size = static_cast<VkDeviceSize>(num_vertices * sizeof(u16));
cmdbuf.Dispatch(Common::DivCeil(num_vertices, DISPATCH_SIZE), 1, 1);
cmdbuf.PipelineBarrier(VK_PIPELINE_STAGE_COMPUTE_SHADER_BIT,
VK_PIPELINE_STAGE_VERTEX_INPUT_BIT, 0, {}, barrier, {});
VK_PIPELINE_STAGE_VERTEX_INPUT_BIT, 0, WRITE_BARRIER);
});
return {staging.buffer, 0};
return {staging.buffer, staging.offset};
}
QuadIndexedPass::QuadIndexedPass(const Device& device_, VKScheduler& scheduler_,
@@ -194,7 +190,7 @@ QuadIndexedPass::QuadIndexedPass(const Device& device_, VKScheduler& scheduler_,
QuadIndexedPass::~QuadIndexedPass() = default;
std::pair<VkBuffer, u32> QuadIndexedPass::Assemble(
std::pair<VkBuffer, VkDeviceSize> QuadIndexedPass::Assemble(
Tegra::Engines::Maxwell3D::Regs::IndexFormat index_format, u32 num_vertices, u32 base_vertex,
VkBuffer src_buffer, u32 src_offset) {
const u32 index_shift = [index_format] {
@@ -217,34 +213,29 @@ std::pair<VkBuffer, u32> QuadIndexedPass::Assemble(
update_descriptor_queue.Acquire();
update_descriptor_queue.AddBuffer(src_buffer, src_offset, input_size);
update_descriptor_queue.AddBuffer(staging.buffer, 0, staging_size);
update_descriptor_queue.AddBuffer(staging.buffer, staging.offset, staging_size);
const VkDescriptorSet set = CommitDescriptorSet(update_descriptor_queue);
scheduler.RequestOutsideRenderPassOperationContext();
scheduler.Record([layout = *layout, pipeline = *pipeline, buffer = staging.buffer, set,
num_tri_vertices, base_vertex, index_shift](vk::CommandBuffer cmdbuf) {
static constexpr u32 dispatch_size = 1024;
static constexpr u32 DISPATCH_SIZE = 1024;
static constexpr VkMemoryBarrier WRITE_BARRIER{
.sType = VK_STRUCTURE_TYPE_MEMORY_BARRIER,
.pNext = nullptr,
.srcAccessMask = VK_ACCESS_SHADER_WRITE_BIT,
.dstAccessMask = VK_ACCESS_VERTEX_ATTRIBUTE_READ_BIT,
};
const std::array push_constants = {base_vertex, index_shift};
cmdbuf.BindPipeline(VK_PIPELINE_BIND_POINT_COMPUTE, pipeline);
cmdbuf.BindDescriptorSets(VK_PIPELINE_BIND_POINT_COMPUTE, layout, 0, set, {});
cmdbuf.PushConstants(layout, VK_SHADER_STAGE_COMPUTE_BIT, 0, sizeof(push_constants),
&push_constants);
cmdbuf.Dispatch(Common::AlignUp(num_tri_vertices, dispatch_size) / dispatch_size, 1, 1);
VkBufferMemoryBarrier barrier;
barrier.sType = VK_STRUCTURE_TYPE_BUFFER_MEMORY_BARRIER;
barrier.pNext = nullptr;
barrier.srcAccessMask = VK_ACCESS_SHADER_WRITE_BIT;
barrier.dstAccessMask = VK_ACCESS_VERTEX_ATTRIBUTE_READ_BIT;
barrier.srcQueueFamilyIndex = VK_QUEUE_FAMILY_IGNORED;
barrier.dstQueueFamilyIndex = VK_QUEUE_FAMILY_IGNORED;
barrier.buffer = buffer;
barrier.offset = 0;
barrier.size = static_cast<VkDeviceSize>(num_tri_vertices * sizeof(u32));
cmdbuf.Dispatch(Common::DivCeil(num_tri_vertices, DISPATCH_SIZE), 1, 1);
cmdbuf.PipelineBarrier(VK_PIPELINE_STAGE_COMPUTE_SHADER_BIT,
VK_PIPELINE_STAGE_VERTEX_INPUT_BIT, 0, {}, barrier, {});
VK_PIPELINE_STAGE_VERTEX_INPUT_BIT, 0, WRITE_BARRIER);
});
return {staging.buffer, 0};
return {staging.buffer, staging.offset};
}
} // namespace Vulkan

9
src/video_core/renderer_vulkan/vk_compute_pass.h
View File

@@ -50,7 +50,8 @@ public:
/// Assemble uint8 indices into an uint16 index buffer
/// Returns a pair with the staging buffer, and the offset where the assembled data is
std::pair<VkBuffer, u32> Assemble(u32 num_vertices, VkBuffer src_buffer, u32 src_offset);
std::pair<VkBuffer, VkDeviceSize> Assemble(u32 num_vertices, VkBuffer src_buffer,
u32 src_offset);
private:
VKScheduler& scheduler;
@@ -66,9 +67,9 @@ public:
VKUpdateDescriptorQueue& update_descriptor_queue_);
~QuadIndexedPass();
std::pair<VkBuffer, u32> Assemble(Tegra::Engines::Maxwell3D::Regs::IndexFormat index_format,
u32 num_vertices, u32 base_vertex, VkBuffer src_buffer,
u32 src_offset);
std::pair<VkBuffer, VkDeviceSize> Assemble(
Tegra::Engines::Maxwell3D::Regs::IndexFormat index_format, u32 num_vertices,
u32 base_vertex, VkBuffer src_buffer, u32 src_offset);
private:
VKScheduler& scheduler;

143
src/video_core/renderer_vulkan/vk_staging_buffer_pool.cpp
View File

@@ -8,6 +8,7 @@
#include <fmt/format.h>
#include "common/alignment.h"
#include "common/assert.h"
#include "common/bit_util.h"
#include "common/common_types.h"
@@ -17,14 +18,118 @@
#include "video_core/vulkan_common/vulkan_wrapper.h"
namespace Vulkan {
namespace {
// Maximum potential alignment of a Vulkan buffer
constexpr VkDeviceSize MAX_ALIGNMENT = 256;
// Maximum size to put elements in the stream buffer
constexpr VkDeviceSize MAX_STREAM_BUFFER_REQUEST_SIZE = 8 * 1024 * 1024;
// Stream buffer size in bytes
constexpr VkDeviceSize STREAM_BUFFER_SIZE = 128 * 1024 * 1024;
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) {
// Try to find a DEVICE_LOCAL_BIT type, Nvidia and AMD have a dedicated heap for this
std::optional<u32> 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;
}
} // Anonymous namespace
StagingBufferPool::StagingBufferPool(const Device& device_, MemoryAllocator& memory_allocator_,
VKScheduler& scheduler_)
: device{device_}, memory_allocator{memory_allocator_}, scheduler{scheduler_} {}
: device{device_}, memory_allocator{memory_allocator_}, scheduler{scheduler_} {
const vk::Device& dev = device.GetLogical();
stream_buffer = dev.CreateBuffer(VkBufferCreateInfo{
.sType = VK_STRUCTURE_TYPE_BUFFER_CREATE_INFO,
.pNext = nullptr,
.flags = 0,
.size = STREAM_BUFFER_SIZE,
.usage = VK_BUFFER_USAGE_TRANSFER_SRC_BIT | VK_BUFFER_USAGE_UNIFORM_BUFFER_BIT |
VK_BUFFER_USAGE_INDEX_BUFFER_BIT,
.sharingMode = VK_SHARING_MODE_EXCLUSIVE,
.queueFamilyIndexCount = 0,
.pQueueFamilyIndices = nullptr,
});
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();
stream_memory = dev.AllocateMemory(VkMemoryAllocateInfo{
.sType = VK_STRUCTURE_TYPE_MEMORY_ALLOCATE_INFO,
.pNext = make_dedicated ? &dedicated_info : nullptr,
.allocationSize = requirements.size,
.memoryTypeIndex = FindMemoryTypeIndex(memory_properties, requirements.memoryTypeBits),
});
if (device.HasDebuggingToolAttached()) {
stream_memory.SetObjectNameEXT("Stream Buffer Memory");
}
stream_buffer.BindMemory(*stream_memory, 0);
stream_pointer = stream_memory.Map(0, STREAM_BUFFER_SIZE);
}
StagingBufferPool::~StagingBufferPool() = default;
StagingBufferRef StagingBufferPool::Request(size_t size, MemoryUsage usage) {
if (usage == MemoryUsage::Upload && size <= MAX_STREAM_BUFFER_REQUEST_SIZE) {
return GetStreamBuffer(size);
}
if (const std::optional<StagingBufferRef> ref = TryGetReservedBuffer(size, usage)) {
return *ref;
}
@@ -39,6 +144,42 @@ void StagingBufferPool::TickFrame() {
ReleaseCache(MemoryUsage::Download);
}
StagingBufferRef StagingBufferPool::GetStreamBuffer(size_t size) {
for (size_t region = Region(used_iterator), region_end = Region(iterator); region < region_end;
++region) {
sync_ticks[region] = scheduler.CurrentTick();
}
used_iterator = iterator;
for (size_t region = Region(free_iterator) + 1,
region_end = std::min(Region(iterator + size) + 1, NUM_SYNCS);
region < region_end; ++region) {
scheduler.Wait(sync_ticks[region]);
}
if (iterator + size > free_iterator) {
free_iterator = iterator + size;
}
if (iterator + size > STREAM_BUFFER_SIZE) {
for (size_t region = Region(used_iterator); region < NUM_SYNCS; ++region) {
sync_ticks[region] = scheduler.CurrentTick();
}
used_iterator = 0;
iterator = 0;
free_iterator = size;
for (size_t region = 0, region_end = Region(size); region <= region_end; ++region) {
scheduler.Wait(sync_ticks[region]);
}
}
const size_t offset = iterator;
iterator = Common::AlignUp(iterator + size, MAX_ALIGNMENT);
return StagingBufferRef{
.buffer = *stream_buffer,
.offset = static_cast<VkDeviceSize>(offset),
.mapped_span = std::span<u8>(stream_pointer + offset, size),
};
}
std::optional<StagingBufferRef> StagingBufferPool::TryGetReservedBuffer(size_t size,
MemoryUsage usage) {
StagingBuffers& cache_level = GetCache(usage)[Common::Log2Ceil64(size)];

20
src/video_core/renderer_vulkan/vk_staging_buffer_pool.h
View File

@@ -19,11 +19,14 @@ class VKScheduler;
struct StagingBufferRef {
VkBuffer buffer;
VkDeviceSize offset;
std::span<u8> mapped_span;
};
class StagingBufferPool {
public:
static constexpr size_t NUM_SYNCS = 16;
explicit StagingBufferPool(const Device& device, MemoryAllocator& memory_allocator,
VKScheduler& scheduler);
~StagingBufferPool();
@@ -33,6 +36,11 @@ public:
void TickFrame();
private:
struct StreamBufferCommit {
size_t upper_bound;
u64 tick;
};
struct StagingBuffer {
vk::Buffer buffer;
MemoryCommit commit;
@@ -42,6 +50,7 @@ private:
StagingBufferRef Ref() const noexcept {
return {
.buffer = *buffer,
.offset = 0,
.mapped_span = mapped_span,
};
}
@@ -56,6 +65,8 @@ private:
static constexpr size_t NUM_LEVELS = sizeof(size_t) * CHAR_BIT;
using StagingBuffersCache = std::array<StagingBuffers, NUM_LEVELS>;
StagingBufferRef GetStreamBuffer(size_t size);
std::optional<StagingBufferRef> TryGetReservedBuffer(size_t size, MemoryUsage usage);
StagingBufferRef CreateStagingBuffer(size_t size, MemoryUsage usage);
@@ -70,6 +81,15 @@ private:
MemoryAllocator& memory_allocator;
VKScheduler& scheduler;
vk::Buffer stream_buffer;
vk::DeviceMemory stream_memory;
u8* stream_pointer = nullptr;
size_t iterator = 0;
size_t used_iterator = 0;
size_t free_iterator = 0;
std::array<u64, NUM_SYNCS> sync_ticks{};
StagingBuffersCache device_local_cache;
StagingBuffersCache upload_cache;
StagingBuffersCache download_cache;

14
src/video_core/renderer_vulkan/vk_texture_cache.cpp
View File

@@ -802,11 +802,10 @@ Image::Image(TextureCacheRuntime& runtime, const ImageInfo& info_, GPUVAddr gpu_
}
}
void Image::UploadMemory(const StagingBufferRef& map, size_t buffer_offset,
std::span<const BufferImageCopy> copies) {
void Image::UploadMemory(const StagingBufferRef& map, std::span<const BufferImageCopy> copies) {
// TODO: Move this to another API
scheduler->RequestOutsideRenderPassOperationContext();
std::vector vk_copies = TransformBufferImageCopies(copies, buffer_offset, aspect_mask);
std::vector vk_copies = TransformBufferImageCopies(copies, map.offset, aspect_mask);
const VkBuffer src_buffer = map.buffer;
const VkImage vk_image = *image;
const VkImageAspectFlags vk_aspect_mask = aspect_mask;
@@ -817,11 +816,11 @@ void Image::UploadMemory(const StagingBufferRef& map, size_t buffer_offset,
});
}
void Image::UploadMemory(const StagingBufferRef& map, size_t buffer_offset,
void Image::UploadMemory(const StagingBufferRef& map,
std::span<const VideoCommon::BufferCopy> copies) {
// TODO: Move this to another API
scheduler->RequestOutsideRenderPassOperationContext();
std::vector vk_copies = TransformBufferCopies(copies, buffer_offset);
std::vector vk_copies = TransformBufferCopies(copies, map.offset);
const VkBuffer src_buffer = map.buffer;
const VkBuffer dst_buffer = *buffer;
scheduler->Record([src_buffer, dst_buffer, vk_copies](vk::CommandBuffer cmdbuf) {
@@ -830,9 +829,8 @@ void Image::UploadMemory(const StagingBufferRef& map, size_t buffer_offset,
});
}
void Image::DownloadMemory(const StagingBufferRef& map, size_t buffer_offset,
std::span<const BufferImageCopy> copies) {
std::vector vk_copies = TransformBufferImageCopies(copies, buffer_offset, aspect_mask);
void Image::DownloadMemory(const StagingBufferRef& map, std::span<const BufferImageCopy> copies) {
std::vector vk_copies = TransformBufferImageCopies(copies, map.offset, aspect_mask);
scheduler->Record([buffer = map.buffer, image = *image, aspect_mask = aspect_mask,
vk_copies](vk::CommandBuffer cmdbuf) {
const VkImageMemoryBarrier read_barrier{

9
src/video_core/renderer_vulkan/vk_texture_cache.h
View File

@@ -82,7 +82,7 @@ struct TextureCacheRuntime {
return false;
}
void AccelerateImageUpload(Image&, const StagingBufferRef&, size_t,
void AccelerateImageUpload(Image&, const StagingBufferRef&,
std::span<const VideoCommon::SwizzleParameters>) {
UNREACHABLE();
}
@@ -100,13 +100,12 @@ public:
explicit Image(TextureCacheRuntime&, const VideoCommon::ImageInfo& info, GPUVAddr gpu_addr,
VAddr cpu_addr);
void UploadMemory(const StagingBufferRef& map, size_t buffer_offset,
void UploadMemory(const StagingBufferRef& map,
std::span<const VideoCommon::BufferImageCopy> copies);
void UploadMemory(const StagingBufferRef& map, size_t buffer_offset,
std::span<const VideoCommon::BufferCopy> copies);
void UploadMemory(const StagingBufferRef& map, std::span<const VideoCommon::BufferCopy> copies);
void DownloadMemory(const StagingBufferRef& map, size_t buffer_offset,
void DownloadMemory(const StagingBufferRef& map,
std::span<const VideoCommon::BufferImageCopy> copies);
[[nodiscard]] VkImage Handle() const noexcept {