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buffer_cache: Implement a generic buffer cache 

Implements a templated class with a similar approach to our current
generic texture cache. It is designed to be compatible with Vulkan and
OpenGL,
This commit is contained in:
ReinUsesLisp 2019-06-16 20:00:48 -03:00
parent 2bcae41a73
commit 32c0212b24
2 changed files with 301 additions and 0 deletions
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1
src/video_core/CMakeLists.txt
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@ -1,4 +1,5 @@
add_library(video_core STATIC add_library(video_core STATIC
buffer_cache.h
dma_pusher.cpp dma_pusher.cpp
dma_pusher.h dma_pusher.h
debug_utils/debug_utils.cpp debug_utils/debug_utils.cpp

300
src/video_core/buffer_cache.h Normal file
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// Copyright 2019 yuzu Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#pragma once
#include <array>
#include <memory>
#include <mutex>
#include <unordered_map>
#include <unordered_set>
#include <utility>
#include <vector>
#include "common/alignment.h"
#include "common/common_types.h"
#include "core/core.h"
#include "video_core/memory_manager.h"
#include "video_core/rasterizer_cache.h"
namespace VideoCore {
class RasterizerInterface;
}
namespace VideoCommon {
template <typename BufferStorageType>
class CachedBuffer final : public RasterizerCacheObject {
public:
explicit CachedBuffer(VAddr cpu_addr, u8* host_ptr)
: RasterizerCacheObject{host_ptr}, host_ptr{host_ptr}, cpu_addr{cpu_addr} {}
~CachedBuffer() override = default;
VAddr GetCpuAddr() const override {
return cpu_addr;
}
std::size_t GetSizeInBytes() const override {
return size;
}
u8* GetWritableHostPtr() const {
return host_ptr;
}
std::size_t GetSize() const {
return size;
}
std::size_t GetCapacity() const {
return capacity;
}
bool IsInternalized() const {
return is_internal;
}
const BufferStorageType& GetBuffer() const {
return buffer;
}
void SetSize(std::size_t new_size) {
size = new_size;
}
void SetInternalState(bool is_internal_) {
is_internal = is_internal_;
}
BufferStorageType ExchangeBuffer(BufferStorageType buffer_, std::size_t new_capacity) {
capacity = new_capacity;
std::swap(buffer, buffer_);
return buffer_;
}
private:
u8* host_ptr{};
VAddr cpu_addr{};
std::size_t size{};
std::size_t capacity{};
bool is_internal{};
BufferStorageType buffer;
};
template <typename BufferStorageType, typename BufferType, typename StreamBuffer>
class BufferCache : public RasterizerCache<std::shared_ptr<CachedBuffer<BufferStorageType>>> {
public:
using Buffer = std::shared_ptr<CachedBuffer<BufferStorageType>>;
using BufferInfo = std::pair<const BufferType*, u64>;
explicit BufferCache(VideoCore::RasterizerInterface& rasterizer, Core::System& system,
std::unique_ptr<StreamBuffer> stream_buffer)
: RasterizerCache<Buffer>{rasterizer}, system{system},
stream_buffer{std::move(stream_buffer)}, stream_buffer_handle{
this->stream_buffer->GetHandle()} {}
~BufferCache() = default;
void Unregister(const Buffer& entry) override {
std::lock_guard lock{RasterizerCache<Buffer>::mutex};
if (entry->IsInternalized()) {
internalized_entries.erase(entry->GetCacheAddr());
}
ReserveBuffer(entry);
RasterizerCache<Buffer>::Unregister(entry);
}
void TickFrame() {
marked_for_destruction_index =
(marked_for_destruction_index + 1) % marked_for_destruction_ring_buffer.size();
MarkedForDestruction().clear();
}
[[nodiscard]] BufferInfo UploadMemory(GPUVAddr gpu_addr, std::size_t size,
std::size_t alignment = 4, bool internalize = false,
bool is_written = false) {
std::lock_guard lock{RasterizerCache<Buffer>::mutex};
auto& memory_manager = system.GPU().MemoryManager();
const auto host_ptr = memory_manager.GetPointer(gpu_addr);
if (!host_ptr) {
return {GetEmptyBuffer(size), 0};
}
const auto cache_addr = ToCacheAddr(host_ptr);
// Cache management is a big overhead, so only cache entries with a given size.
// TODO: Figure out which size is the best for given games.
constexpr std::size_t max_stream_size = 0x800;
if (!internalize && size < max_stream_size &&
internalized_entries.find(cache_addr) == internalized_entries.end()) {
return StreamBufferUpload(host_ptr, size, alignment);
}
auto entry = RasterizerCache<Buffer>::TryGet(cache_addr);
if (!entry) {
return FixedBufferUpload(gpu_addr, host_ptr, size, internalize, is_written);
}
if (entry->GetSize() < size) {
IncreaseBufferSize(entry, size);
}
if (is_written) {
entry->MarkAsModified(true, *this);
}
return {ToHandle(entry->GetBuffer()), 0};
}
/// Uploads from a host memory. Returns the OpenGL buffer where it's located and its offset.
[[nodiscard]] BufferInfo UploadHostMemory(const void* raw_pointer, std::size_t size,
std::size_t alignment = 4) {
std::lock_guard lock{RasterizerCache<Buffer>::mutex};
return StreamBufferUpload(raw_pointer, size, alignment);
}
void Map(std::size_t max_size) {
std::tie(buffer_ptr, buffer_offset_base, invalidated) = stream_buffer->Map(max_size, 4);
buffer_offset = buffer_offset_base;
}
/// Finishes the upload stream, returns true on bindings invalidation.
bool Unmap() {
stream_buffer->Unmap(buffer_offset - buffer_offset_base);
return std::exchange(invalidated, false);
}
protected:
void FlushObjectInner(const Buffer& entry) override {
DownloadBufferData(entry->GetBuffer(), 0, entry->GetSize(), entry->GetWritableHostPtr());
}
virtual BufferStorageType CreateBuffer(std::size_t size) = 0;
virtual const BufferType* ToHandle(const BufferStorageType& storage) = 0;
virtual const BufferType* GetEmptyBuffer(std::size_t size) = 0;
virtual void UploadBufferData(const BufferStorageType& buffer, std::size_t offset,
std::size_t size, const u8* data) = 0;
virtual void DownloadBufferData(const BufferStorageType& buffer, std::size_t offset,
std::size_t size, u8* data) = 0;
virtual void CopyBufferData(const BufferStorageType& src, const BufferStorageType& dst,
std::size_t src_offset, std::size_t dst_offset,
std::size_t size) = 0;
private:
BufferInfo StreamBufferUpload(const void* raw_pointer, std::size_t size,
std::size_t alignment) {
AlignBuffer(alignment);
const std::size_t uploaded_offset = buffer_offset;
std::memcpy(buffer_ptr, raw_pointer, size);
buffer_ptr += size;
buffer_offset += size;
return {&stream_buffer_handle, uploaded_offset};
}
BufferInfo FixedBufferUpload(GPUVAddr gpu_addr, u8* host_ptr, std::size_t size,
bool internalize, bool is_written) {
auto& memory_manager = Core::System::GetInstance().GPU().MemoryManager();
const auto cpu_addr = memory_manager.GpuToCpuAddress(gpu_addr);
ASSERT(cpu_addr);
auto entry = GetUncachedBuffer(*cpu_addr, host_ptr);
entry->SetSize(size);
entry->SetInternalState(internalize);
RasterizerCache<Buffer>::Register(entry);
if (internalize) {
internalized_entries.emplace(ToCacheAddr(host_ptr));
}
if (is_written) {
entry->MarkAsModified(true, *this);
}
if (entry->GetCapacity() < size) {
MarkedForDestruction().push_back(entry->ExchangeBuffer(CreateBuffer(size), size));
}
UploadBufferData(entry->GetBuffer(), 0, size, host_ptr);
return {ToHandle(entry->GetBuffer()), 0};
}
void IncreaseBufferSize(Buffer& entry, std::size_t new_size) {
const std::size_t old_size = entry->GetSize();
if (entry->GetCapacity() < new_size) {
const auto& old_buffer = entry->GetBuffer();
auto new_buffer = CreateBuffer(new_size);
// Copy bits from the old buffer to the new buffer.
CopyBufferData(old_buffer, new_buffer, 0, 0, old_size);
MarkedForDestruction().push_back(
entry->ExchangeBuffer(std::move(new_buffer), new_size));
// This buffer could have been used
invalidated = true;
}
// Upload the new bits.
const std::size_t size_diff = new_size - old_size;
UploadBufferData(entry->GetBuffer(), old_size, size_diff, entry->GetHostPtr() + old_size);
// Update entry's size in the object and in the cache.
Unregister(entry);
entry->SetSize(new_size);
RasterizerCache<Buffer>::Register(entry);
}
Buffer GetUncachedBuffer(VAddr cpu_addr, u8* host_ptr) {
if (auto entry = TryGetReservedBuffer(host_ptr)) {
return entry;
}
return std::make_shared<Buffer::element_type>(cpu_addr, host_ptr);
}
Buffer TryGetReservedBuffer(u8* host_ptr) {
const auto it = buffer_reserve.find(ToCacheAddr(host_ptr));
if (it == buffer_reserve.end()) {
return {};
}
auto& reserve = it->second;
auto entry = reserve.back();
reserve.pop_back();
return entry;
}
void ReserveBuffer(Buffer entry) {
buffer_reserve[entry->GetCacheAddr()].push_back(std::move(entry));
}
void AlignBuffer(std::size_t alignment) {
// Align the offset, not the mapped pointer
const std::size_t offset_aligned = Common::AlignUp(buffer_offset, alignment);
buffer_ptr += offset_aligned - buffer_offset;
buffer_offset = offset_aligned;
}
std::vector<BufferStorageType>& MarkedForDestruction() {
return marked_for_destruction_ring_buffer[marked_for_destruction_index];
}
Core::System& system;
std::unique_ptr<StreamBuffer> stream_buffer;
BufferType stream_buffer_handle{};
bool invalidated = false;
u8* buffer_ptr = nullptr;
u64 buffer_offset = 0;
u64 buffer_offset_base = 0;
std::size_t marked_for_destruction_index = 0;
std::array<std::vector<BufferStorageType>, 4> marked_for_destruction_ring_buffer;
std::unordered_set<CacheAddr> internalized_entries;
std::unordered_map<CacheAddr, std::vector<Buffer>> buffer_reserve;
};
} // namespace VideoCommon