diff options
| author | riperiperi <rhy3756547@hotmail.com> | 2022-10-29 23:07:37 +0100 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2022-10-29 22:07:37 +0000 |
| commit | 3d98e1361b2f1c3993aa7f1e9b1ac49fc5b6e512 (patch) | |
| tree | 010767e20636e9837652a0133fc1ef40838c942e /Ryujinx.Memory/Tracking/BitMap.cs | |
| parent | 141cf61ff72224c394cab4e5e252907d0cdb797a (diff) | |
GPU: Use a bitmap to track buffer modified flags. (#3775)1.1.335
* Initial implementation
* Some improvements.
* Fix incorrect cast
* Performance improvement and improved correctness
* Add very fast path when all handles are checked.
* Slightly faster
* Add comment
* De-virtualize region handle
All region handles are now bitmap backed.
* Remove non-bitmap tracking
* Remove unused methods
* Add docs, remove unused methods
* Address Feedback
* Rename file
Diffstat (limited to 'Ryujinx.Memory/Tracking/BitMap.cs')
| -rw-r--r-- | Ryujinx.Memory/Tracking/BitMap.cs | 199 |
1 files changed, 199 insertions, 0 deletions
diff --git a/Ryujinx.Memory/Tracking/BitMap.cs b/Ryujinx.Memory/Tracking/BitMap.cs new file mode 100644 index 00000000..d3f15994 --- /dev/null +++ b/Ryujinx.Memory/Tracking/BitMap.cs @@ -0,0 +1,199 @@ +using System.Runtime.CompilerServices; + +namespace Ryujinx.Memory.Tracking +{ + /// <summary> + /// A bitmap that can check or set large ranges of true/false values at once. + /// </summary> + struct BitMap + { + public const int IntSize = 64; + + private const int IntShift = 6; + private const int IntMask = IntSize - 1; + + /// <summary> + /// Masks representing the bitmap. Least significant bit first, 64-bits per mask. + /// </summary> + public readonly long[] Masks; + + /// <summary> + /// Create a new bitmap. + /// </summary> + /// <param name="count">The number of bits to reserve</param> + public BitMap(int count) + { + Masks = new long[(count + IntMask) / IntSize]; + } + + /// <summary> + /// Check if any bit in the bitmap is set. + /// </summary> + /// <returns>True if any bits are set, false otherwise</returns> + public bool AnySet() + { + for (int i = 0; i < Masks.Length; i++) + { + if (Masks[i] != 0) + { + return true; + } + } + + return false; + } + + /// <summary> + /// Check if a bit in the bitmap is set. + /// </summary> + /// <param name="bit">The bit index to check</param> + /// <returns>True if the bit is set, false otherwise</returns> + [MethodImpl(MethodImplOptions.AggressiveInlining)] + public bool IsSet(int bit) + { + int wordIndex = bit >> IntShift; + int wordBit = bit & IntMask; + + long wordMask = 1L << wordBit; + + return (Masks[wordIndex] & wordMask) != 0; + } + + /// <summary> + /// Check if any bit in a range of bits in the bitmap are set. (inclusive) + /// </summary> + /// <param name="start">The first bit index to check</param> + /// <param name="end">The last bit index to check</param> + /// <returns>True if a bit is set, false otherwise</returns> + public bool IsSet(int start, int end) + { + if (start == end) + { + return IsSet(start); + } + + int startIndex = start >> IntShift; + int startBit = start & IntMask; + long startMask = -1L << startBit; + + int endIndex = end >> IntShift; + int endBit = end & IntMask; + long endMask = (long)(ulong.MaxValue >> (IntMask - endBit)); + + if (startIndex == endIndex) + { + return (Masks[startIndex] & startMask & endMask) != 0; + } + + if ((Masks[startIndex] & startMask) != 0) + { + return true; + } + + for (int i = startIndex + 1; i < endIndex; i++) + { + if (Masks[i] != 0) + { + return true; + } + } + + if ((Masks[endIndex] & endMask) != 0) + { + return true; + } + + return false; + } + + /// <summary> + /// Set a bit at a specific index to 1. + /// </summary> + /// <param name="bit">The bit index to set</param> + /// <returns>True if the bit is set, false if it was already set</returns> + public bool Set(int bit) + { + int wordIndex = bit >> IntShift; + int wordBit = bit & IntMask; + + long wordMask = 1L << wordBit; + + if ((Masks[wordIndex] & wordMask) != 0) + { + return false; + } + + Masks[wordIndex] |= wordMask; + + return true; + } + + /// <summary> + /// Set a range of bits in the bitmap to 1. + /// </summary> + /// <param name="start">The first bit index to set</param> + /// <param name="end">The last bit index to set</param> + public void SetRange(int start, int end) + { + if (start == end) + { + Set(start); + return; + } + + int startIndex = start >> IntShift; + int startBit = start & IntMask; + long startMask = -1L << startBit; + + int endIndex = end >> IntShift; + int endBit = end & IntMask; + long endMask = (long)(ulong.MaxValue >> (IntMask - endBit)); + + if (startIndex == endIndex) + { + Masks[startIndex] |= startMask & endMask; + } + else + { + Masks[startIndex] |= startMask; + + for (int i = startIndex + 1; i < endIndex; i++) + { + Masks[i] |= -1; + } + + Masks[endIndex] |= endMask; + } + } + + /// <summary> + /// Clear a bit at a specific index to 0. + /// </summary> + /// <param name="bit">The bit index to clear</param> + /// <returns>True if the bit was set, false if it was not</returns> + public bool Clear(int bit) + { + int wordIndex = bit >> IntShift; + int wordBit = bit & IntMask; + + long wordMask = 1L << wordBit; + + bool wasSet = (Masks[wordIndex] & wordMask) != 0; + + Masks[wordIndex] &= ~wordMask; + + return wasSet; + } + + /// <summary> + /// Clear the bitmap entirely, setting all bits to 0. + /// </summary> + public void Clear() + { + for (int i = 0; i < Masks.Length; i++) + { + Masks[i] = 0; + } + } + } +} |