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Optimize GPU particles Bitonic sort to use separate buffers for indices and keys to avoid additional buffer copy

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Wojtek Figat
2025-08-08 18:24:44 +02:00
parent 519a9c0a14
commit 854f3acd4c
9 changed files with 115 additions and 169 deletions
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8
Source/Engine/Renderer/Utils/BitonicSort.h
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@@ -26,16 +26,16 @@ private:
public:
/// <summary>
/// Sorts the specified buffer of index-key pairs.
/// Sorts the specified buffers of index-key pairs.
/// </summary>
/// <param name="context">The GPU context.</param>
/// <param name="sortingKeysBuffer">The sorting keys buffer. Used as a structured buffer of type Item (see above).</param>
/// <param name="indicesBuffer">The sorting indices buffer with an index for each item (sequence of: 0, 1, 2, 3...). After sorting represents actual items order based on their keys. Valid for uint value types - used as RWBuffer.</param>
/// <param name="keysBuffer">The sorting keys buffer with a sort value for each item (must match order of items in indicesBuffer). Valid for float value types - used as RWBuffer.</param>
/// <param name="countBuffer">The buffer that contains a items counter value.</param>
/// <param name="counterOffset">The offset into counter buffer to find count for this list. Must be a multiple of 4 bytes.</param>
/// <param name="sortAscending">True to sort in ascending order (smallest to largest), otherwise false to sort in descending order.</param>
/// <param name="sortedIndicesBuffer">The output buffer for sorted values extracted from the sorted sortingKeysBuffer after algorithm run. Valid for uint value types - used as RWBuffer.</param>
/// <param name="maxElements">Optional upper limit of elements to sort. Cna be used to optimize indirect dispatches allocation. If non-zero, then it gets calculated based on the input item buffer size.</param>
void Sort(GPUContext* context, GPUBuffer* sortingKeysBuffer, GPUBuffer* countBuffer, uint32 counterOffset, bool sortAscending, GPUBuffer* sortedIndicesBuffer, uint32 maxElements = 0);
void Sort(GPUContext* context, GPUBuffer* indicesBuffer, GPUBuffer* keysBuffer, GPUBuffer* countBuffer, uint32 counterOffset, bool sortAscending, int32 maxElements = 0);
public: