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// Copyright 2019 yuzu Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include <algorithm>
#include <limits>
#include <optional>
#include <tuple>
#include <vector>
#include "common/alignment.h"
#include "common/assert.h"
#include "video_core/renderer_vulkan/vk_scheduler.h"
#include "video_core/renderer_vulkan/vk_stream_buffer.h"
#include "video_core/vulkan_common/vulkan_device.h"
#include "video_core/vulkan_common/vulkan_wrapper.h"
namespace Vulkan {
namespace {
constexpr VkBufferUsageFlags BUFFER_USAGE =
VK_BUFFER_USAGE_VERTEX_BUFFER_BIT | VK_BUFFER_USAGE_INDEX_BUFFER_BIT |
VK_BUFFER_USAGE_UNIFORM_BUFFER_BIT | VK_BUFFER_USAGE_STORAGE_BUFFER_BIT;
constexpr u64 WATCHES_INITIAL_RESERVE = 0x4000;
constexpr u64 WATCHES_RESERVE_CHUNK = 0x1000;
constexpr u64 PREFERRED_STREAM_BUFFER_SIZE = 256 * 1024 * 1024;
/// Find a memory type with the passed requirements
std::optional<u32> FindMemoryType(const VkPhysicalDeviceMemoryProperties& properties,
VkMemoryPropertyFlags wanted,
u32 filter = std::numeric_limits<u32>::max()) {
for (u32 i = 0; i < properties.memoryTypeCount; ++i) {
const auto flags = properties.memoryTypes[i].propertyFlags;
if ((flags & wanted) == wanted && (filter & (1U << i)) != 0) {
return i;
}
}
return std::nullopt;
}
/// Get the preferred host visible memory type.
u32 GetMemoryType(const VkPhysicalDeviceMemoryProperties& properties,
u32 filter = std::numeric_limits<u32>::max()) {
// Prefer device local host visible allocations. Both AMD and Nvidia now provide one.
// Otherwise search for a host visible allocation.
static constexpr auto HOST_MEMORY =
VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT;
static constexpr auto DYNAMIC_MEMORY = HOST_MEMORY | VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT;
std::optional preferred_type = FindMemoryType(properties, DYNAMIC_MEMORY);
if (!preferred_type) {
preferred_type = FindMemoryType(properties, HOST_MEMORY);
ASSERT_MSG(preferred_type, "No host visible and coherent memory type found");
}
return preferred_type.value_or(0);
}
} // Anonymous namespace
VKStreamBuffer::VKStreamBuffer(const Device& device_, VKScheduler& scheduler_)
: device{device_}, scheduler{scheduler_} {
CreateBuffers();
ReserveWatches(current_watches, WATCHES_INITIAL_RESERVE);
ReserveWatches(previous_watches, WATCHES_INITIAL_RESERVE);
}
VKStreamBuffer::~VKStreamBuffer() = default;
std::pair<u8*, u64> VKStreamBuffer::Map(u64 size, u64 alignment) {
ASSERT(size <= stream_buffer_size);
mapped_size = size;
if (alignment > 0) {
offset = Common::AlignUp(offset, alignment);
}
WaitPendingOperations(offset);
if (offset + size > stream_buffer_size) {
// The buffer would overflow, save the amount of used watches and reset the state.
invalidation_mark = current_watch_cursor;
current_watch_cursor = 0;
offset = 0;
// Swap watches and reset waiting cursors.
std::swap(previous_watches, current_watches);
wait_cursor = 0;
wait_bound = 0;
// Ensure that we don't wait for uncommitted fences.
scheduler.Flush();
}
return std::make_pair(memory.Map(offset, size), offset);
}
void VKStreamBuffer::Unmap(u64 size) {
ASSERT_MSG(size <= mapped_size, "Reserved size is too small");
memory.Unmap();
offset += size;
if (current_watch_cursor + 1 >= current_watches.size()) {
// Ensure that there are enough watches.
ReserveWatches(current_watches, WATCHES_RESERVE_CHUNK);
}
auto& watch = current_watches[current_watch_cursor++];
watch.upper_bound = offset;
watch.tick = scheduler.CurrentTick();
}
void VKStreamBuffer::CreateBuffers() {
const auto memory_properties = device.GetPhysical().GetMemoryProperties();
const u32 preferred_type = GetMemoryType(memory_properties);
const u32 preferred_heap = memory_properties.memoryTypes[preferred_type].heapIndex;
// Substract from the preferred heap size some bytes to avoid getting out of memory.
const VkDeviceSize heap_size = memory_properties.memoryHeaps[preferred_heap].size;
// As per DXVK's example, using `heap_size / 2`
const VkDeviceSize allocable_size = heap_size / 2;
buffer = device.GetLogical().CreateBuffer({
.sType = VK_STRUCTURE_TYPE_BUFFER_CREATE_INFO,
.pNext = nullptr,
.flags = 0,
.size = std::min(PREFERRED_STREAM_BUFFER_SIZE, allocable_size),
.usage = BUFFER_USAGE,
.sharingMode = VK_SHARING_MODE_EXCLUSIVE,
.queueFamilyIndexCount = 0,
.pQueueFamilyIndices = nullptr,
});
const auto requirements = device.GetLogical().GetBufferMemoryRequirements(*buffer);
const u32 required_flags = requirements.memoryTypeBits;
stream_buffer_size = static_cast<u64>(requirements.size);
memory = device.GetLogical().AllocateMemory({
.sType = VK_STRUCTURE_TYPE_MEMORY_ALLOCATE_INFO,
.pNext = nullptr,
.allocationSize = requirements.size,
.memoryTypeIndex = GetMemoryType(memory_properties, required_flags),
});
buffer.BindMemory(*memory, 0);
}
void VKStreamBuffer::ReserveWatches(std::vector<Watch>& watches, std::size_t grow_size) {
watches.resize(watches.size() + grow_size);
}
void VKStreamBuffer::WaitPendingOperations(u64 requested_upper_bound) {
if (!invalidation_mark) {
return;
}
while (requested_upper_bound < wait_bound && wait_cursor < *invalidation_mark) {
auto& watch = previous_watches[wait_cursor];
wait_bound = watch.upper_bound;
scheduler.Wait(watch.tick);
++wait_cursor;
}
}
} // namespace Vulkan
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