suyu/src/video_core/memory_manager.h
ameerj eb67a45ca8 video_core: NVDEC Implementation
This commit aims to implement the NVDEC (Nvidia Decoder) functionality, with video frame decoding being handled by the FFmpeg library.

The process begins with Ioctl commands being sent to the NVDEC and VIC (Video Image Composer) emulated devices. These allocate the necessary GPU buffers for the frame data, along with providing information on the incoming video data. A Submit command then signals the GPU to process and decode the frame data.

To decode the frame, the respective codec's header must be manually composed from the information provided by NVDEC, then sent with the raw frame data to the ffmpeg library.

Currently, H264 and VP9 are supported, with VP9 having some minor artifacting issues related mainly to the reference frame composition in its uncompressed header.

Async GPU is not properly implemented at the moment.

Co-Authored-By: David <25727384+ogniK5377@users.noreply.github.com>
2020-10-26 23:07:36 -04:00

155 lines
5.5 KiB
C++

// Copyright 2018 yuzu emulator team
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#pragma once
#include <map>
#include <optional>
#include <vector>
#include "common/common_types.h"
namespace VideoCore {
class RasterizerInterface;
}
namespace Core {
class System;
}
namespace Tegra {
class PageEntry final {
public:
enum class State : u32 {
Unmapped = static_cast<u32>(-1),
Allocated = static_cast<u32>(-2),
};
constexpr PageEntry() = default;
constexpr PageEntry(State state) : state{state} {}
constexpr PageEntry(VAddr addr) : state{static_cast<State>(addr >> ShiftBits)} {}
[[nodiscard]] constexpr bool IsUnmapped() const {
return state == State::Unmapped;
}
[[nodiscard]] constexpr bool IsAllocated() const {
return state == State::Allocated;
}
[[nodiscard]] constexpr bool IsValid() const {
return !IsUnmapped() && !IsAllocated();
}
[[nodiscard]] constexpr VAddr ToAddress() const {
if (!IsValid()) {
return {};
}
return static_cast<VAddr>(state) << ShiftBits;
}
[[nodiscard]] constexpr PageEntry operator+(u64 offset) const {
// If this is a reserved value, offsets do not apply
if (!IsValid()) {
return *this;
}
return PageEntry{(static_cast<VAddr>(state) << ShiftBits) + offset};
}
private:
static constexpr std::size_t ShiftBits{12};
State state{State::Unmapped};
};
static_assert(sizeof(PageEntry) == 4, "PageEntry is too large");
class MemoryManager final {
public:
explicit MemoryManager(Core::System& system);
~MemoryManager();
/// Binds a renderer to the memory manager.
void BindRasterizer(VideoCore::RasterizerInterface& rasterizer);
[[nodiscard]] std::optional<VAddr> GpuToCpuAddress(GPUVAddr addr) const;
template <typename T>
[[nodiscard]] T Read(GPUVAddr addr) const;
template <typename T>
void Write(GPUVAddr addr, T data);
[[nodiscard]] u8* GetPointer(GPUVAddr addr);
[[nodiscard]] const u8* GetPointer(GPUVAddr addr) const;
/**
* ReadBlock and WriteBlock are full read and write operations over virtual
* GPU Memory. It's important to use these when GPU memory may not be continuous
* in the Host Memory counterpart. Note: This functions cause Host GPU Memory
* Flushes and Invalidations, respectively to each operation.
*/
void ReadBlock(GPUVAddr gpu_src_addr, void* dest_buffer, std::size_t size) const;
void WriteBlock(GPUVAddr gpu_dest_addr, const void* src_buffer, std::size_t size);
void CopyBlock(GPUVAddr gpu_dest_addr, GPUVAddr gpu_src_addr, std::size_t size);
/**
* ReadBlockUnsafe and WriteBlockUnsafe are special versions of ReadBlock and
* WriteBlock respectively. In this versions, no flushing or invalidation is actually
* done and their performance is similar to a memcpy. This functions can be used
* on either of this 2 scenarios instead of their safe counterpart:
* - Memory which is sure to never be represented in the Host GPU.
* - Memory Managed by a Cache Manager. Example: Texture Flushing should use
* WriteBlockUnsafe instead of WriteBlock since it shouldn't invalidate the texture
* being flushed.
*/
void ReadBlockUnsafe(GPUVAddr gpu_src_addr, void* dest_buffer, std::size_t size) const;
void WriteBlockUnsafe(GPUVAddr gpu_dest_addr, const void* src_buffer, std::size_t size);
void CopyBlockUnsafe(GPUVAddr gpu_dest_addr, GPUVAddr gpu_src_addr, std::size_t size);
/**
* IsGranularRange checks if a gpu region can be simply read with a pointer.
*/
[[nodiscard]] bool IsGranularRange(GPUVAddr gpu_addr, std::size_t size) const;
[[nodiscard]] GPUVAddr Map(VAddr cpu_addr, GPUVAddr gpu_addr, std::size_t size);
[[nodiscard]] GPUVAddr MapAllocate(VAddr cpu_addr, std::size_t size, std::size_t align);
[[nodiscard]] GPUVAddr MapAllocate32(VAddr cpu_addr, std::size_t size);
[[nodiscard]] std::optional<GPUVAddr> AllocateFixed(GPUVAddr gpu_addr, std::size_t size);
[[nodiscard]] GPUVAddr Allocate(std::size_t size, std::size_t align);
void Unmap(GPUVAddr gpu_addr, std::size_t size);
private:
[[nodiscard]] PageEntry GetPageEntry(GPUVAddr gpu_addr) const;
void SetPageEntry(GPUVAddr gpu_addr, PageEntry page_entry, std::size_t size = page_size);
GPUVAddr UpdateRange(GPUVAddr gpu_addr, PageEntry page_entry, std::size_t size);
[[nodiscard]] std::optional<GPUVAddr> FindFreeRange(std::size_t size, std::size_t align,
bool start_32bit_address = false) const;
void TryLockPage(PageEntry page_entry, std::size_t size);
void TryUnlockPage(PageEntry page_entry, std::size_t size);
[[nodiscard]] static constexpr std::size_t PageEntryIndex(GPUVAddr gpu_addr) {
return (gpu_addr >> page_bits) & page_table_mask;
}
static constexpr u64 address_space_size = 1ULL << 40;
static constexpr u64 address_space_start = 1ULL << 32;
static constexpr u64 address_space_start_low = 1ULL << 16;
static constexpr u64 page_bits{16};
static constexpr u64 page_size{1 << page_bits};
static constexpr u64 page_mask{page_size - 1};
static constexpr u64 page_table_bits{24};
static constexpr u64 page_table_size{1 << page_table_bits};
static constexpr u64 page_table_mask{page_table_size - 1};
Core::System& system;
VideoCore::RasterizerInterface* rasterizer = nullptr;
std::vector<PageEntry> page_table;
};
} // namespace Tegra