| // |
| // Copyright (c) 2014 The ANGLE Project Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| // |
| |
| #ifndef COMMON_MEMORYBUFFER_H_ |
| #define COMMON_MEMORYBUFFER_H_ |
| |
| #include "common/Optional.h" |
| #include "common/angleutils.h" |
| #include "common/debug.h" |
| |
| #include <stdint.h> |
| #include <cstddef> |
| |
| namespace angle |
| { |
| |
| class MemoryBuffer final : NonCopyable |
| { |
| public: |
| MemoryBuffer() = default; |
| MemoryBuffer(size_t size) { resize(size); } |
| ~MemoryBuffer(); |
| |
| MemoryBuffer(MemoryBuffer &&other); |
| MemoryBuffer &operator=(MemoryBuffer &&other); |
| |
| bool resize(size_t size); |
| size_t size() const { return mSize; } |
| bool empty() const { return mSize == 0; } |
| |
| const uint8_t *data() const { return mData; } |
| uint8_t *data() |
| { |
| ASSERT(mData); |
| return mData; |
| } |
| |
| uint8_t &operator[](size_t pos) |
| { |
| ASSERT(pos < mSize); |
| return mData[pos]; |
| } |
| const uint8_t &operator[](size_t pos) const |
| { |
| ASSERT(pos < mSize); |
| return mData[pos]; |
| } |
| |
| void fill(uint8_t datum); |
| |
| private: |
| size_t mSize = 0; |
| uint8_t *mData = nullptr; |
| }; |
| |
| class ScratchBuffer final : NonCopyable |
| { |
| public: |
| // If we request a scratch buffer requesting a smaller size this many times, release and |
| // recreate the scratch buffer. This ensures we don't have a degenerate case where we are stuck |
| // hogging memory. |
| ScratchBuffer(uint32_t lifetime); |
| ~ScratchBuffer(); |
| |
| // Returns true with a memory buffer of the requested size, or false on failure. |
| bool get(size_t requestedSize, MemoryBuffer **memoryBufferOut); |
| |
| // Same as get, but ensures new values are initialized to a fixed constant. |
| bool getInitialized(size_t requestedSize, MemoryBuffer **memoryBufferOut, uint8_t initValue); |
| |
| // Ticks the release counter for the scratch buffer. Also done implicitly in get(). |
| void tick(); |
| |
| void clear(); |
| |
| private: |
| bool getImpl(size_t requestedSize, MemoryBuffer **memoryBufferOut, Optional<uint8_t> initValue); |
| |
| const uint32_t mLifetime; |
| uint32_t mResetCounter; |
| MemoryBuffer mScratchMemory; |
| }; |
| |
| } // namespace angle |
| |
| #endif // COMMON_MEMORYBUFFER_H_ |