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// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
// SPDX-License-Identifier: GPL-3.0-or-later
// SPDX-FileCopyrightText: Copyright 2022 yuzu Emulator Project
// SPDX-License-Identifier: GPL-3.0-or-later
#pragma once
#include <algorithm>
#include <bit>
#include <limits>
#include <utility>
#include "common/alignment.h"
#include "common/common_funcs.h"
#include "common/common_types.h"
#include "video_core/buffer_cache/word_manager.h"
namespace VideoCommon {
enum class BufferFlagBits {
Picked = 1 << 0,
CachedWrites = 1 << 1,
PreemtiveDownload = 1 << 2,
};
DECLARE_ENUM_FLAG_OPERATORS(BufferFlagBits)
/// Tag for creating null buffers with no storage or size
struct NullBufferParams {};
/**
* Range tracking buffer container.
*
* It keeps track of the modified CPU and GPU ranges on a CPU page granularity, notifying the given
* rasterizer about state changes in the tracking behavior of the buffer.
*
* The buffer size and address is forcefully aligned to CPU page boundaries.
*/
class BufferBase {
public:
static constexpr u64 BASE_PAGE_BITS = 16;
static constexpr u64 BASE_PAGE_SIZE = 1ULL << BASE_PAGE_BITS;
explicit BufferBase(VAddr cpu_addr_, u64 size_bytes_)
: cpu_addr_cached{static_cast<DAddr>(cpu_addr_)}, cpu_addr{cpu_addr_},
size_bytes{size_bytes_} {}
explicit BufferBase(NullBufferParams) {}
BufferBase& operator=(const BufferBase&) = delete;
BufferBase(const BufferBase&) = delete;
BufferBase& operator=(BufferBase&&) = default;
BufferBase(BufferBase&&) = default;
/// Mark buffer as picked
void Pick() noexcept {
flags |= BufferFlagBits::Picked;
}
void MarkPreemtiveDownload() noexcept {
flags |= BufferFlagBits::PreemtiveDownload;
}
/// Unmark buffer as picked
void Unpick() noexcept {
flags &= ~BufferFlagBits::Picked;
}
/// Increases the likeliness of this being a stream buffer
void IncreaseStreamScore(int score) noexcept {
stream_score += score;
}
/// Returns the likeliness of this being a stream buffer
[[nodiscard]] int StreamScore() const noexcept {
return stream_score;
}
/// Returns true when vaddr -> vaddr+size is fully contained in the buffer
[[nodiscard]] bool IsInBounds(VAddr addr, u64 size) const noexcept {
return addr >= cpu_addr && addr + size <= cpu_addr + SizeBytes();
}
/// Returns true if the buffer has been marked as picked
[[nodiscard]] bool IsPicked() const noexcept {
return True(flags & BufferFlagBits::Picked);
}
/// Returns true when the buffer has pending cached writes
[[nodiscard]] bool HasCachedWrites() const noexcept {
return True(flags & BufferFlagBits::CachedWrites);
}
bool IsPreemtiveDownload() const noexcept {
return True(flags & BufferFlagBits::PreemtiveDownload);
}
/// Returns the base CPU address of the buffer
[[nodiscard]] VAddr CpuAddr() const noexcept {
return cpu_addr;
}
DAddr cpu_addr_cached = 0;
/// Returns the offset relative to the given CPU address
/// @pre IsInBounds returns true
[[nodiscard]] u32 Offset(VAddr other_cpu_addr) const noexcept {
return static_cast<u32>(other_cpu_addr - cpu_addr);
}
size_t getLRUID() const noexcept {
return lru_id;
}
void setLRUID(size_t lru_id_) {
lru_id = lru_id_;
}
size_t SizeBytes() const {
return size_bytes;
}
u64 getWriteTick() const noexcept {
return write_tick;
}
void setWriteTick(u64 write_tick_) {
write_tick = write_tick_;
}
private:
VAddr cpu_addr = 0;
BufferFlagBits flags{};
int stream_score = 0;
size_t lru_id = SIZE_MAX;
size_t size_bytes = 0;
u64 write_tick = 0;
};
} // namespace VideoCommon
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