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[Perf] (DirectVulkan): reuse unchanged global-UBO slices and skip identical descriptor binds

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swung0x48
2026-07-30 08:18:21 -04:00
parent e9ffd99313
commit 6b0c2a15ab
2 changed files with 102 additions and 11 deletions
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MobileGL/MG_Backend/DirectVulkan/Renderer/UniformManager.h
+32
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@@ -39,6 +39,9 @@ namespace MobileGL::MG_Backend::DirectVulkan {
void Shutdown();
void BeginFrame(Uint32 frameIndex);
// A command buffer (re)began recording: descriptor bindings recorded into
// the previous buffer do not carry over, so drop the bind-dedup shadow.
void OnCommandBufferBoundary() { m_lastBindValid = false; }
// A ProgramFactory eviction just destroyed this layout: purge every frame
// slot's cached descriptor sets for it, so a recycled handle value can never
// stale-hit sets written for the dead layout's bindings. The sets are
@@ -185,6 +188,35 @@ namespace MobileGL::MG_Backend::DirectVulkan {
Uint64 m_lastDescriptorSignature = 0;
Bool m_hasLastDescriptor = false;
// vkCmdBindDescriptorSets dedup: consecutive draws with a static uniform
// block resolve to the same set AND the same dynamic offsets, so the
// driver call can be skipped outright. Command-buffer-scope state; reset
// via OnCommandBufferBoundary whenever a recording (re)begins. Keyed on
// layout+bind point, so a pipeline-layout switch always rebinds.
static constexpr Uint32 kMaxShadowedDynamicOffsets = 8;
Bool m_lastBindValid = false;
VkDescriptorSet m_lastBindSet = VK_NULL_HANDLE;
VkPipelineLayout m_lastBindLayout = VK_NULL_HANDLE;
VkPipelineBindPoint m_lastBindPoint = VK_PIPELINE_BIND_POINT_GRAPHICS;
Uint32 m_lastBindOffsetCount = 0;
Uint32 m_lastBindOffsets[kMaxShadowedDynamicOffsets] = {};
// Global-UBO transient-slice reuse: MC leaves the default uniform block
// untouched across long GUI/terrain runs, so the per-draw re-upload of
// the same bytes can reuse the slice uploaded earlier THIS frame (frame
// serial guards arena recycling; the content version guards writes).
struct GlobalUboSliceMemo {
Uint64 programLifetimeId = 0;
Uint64 frameSerial = 0;
Uint32 uboContentVersion = 0;
VkBuffer buffer = VK_NULL_HANDLE;
VkDeviceSize offset = 0;
VkDeviceSize range = 0;
};
static constexpr Uint32 kGlobalUboMemoSize = 4;
GlobalUboSliceMemo m_globalUboMemo[kGlobalUboMemoSize];
Uint32 m_globalUboMemoNext = 0;
// Per-binding fast path over VkSamplerManager's content-hashed sampler cache, which
// stays the source of truth: its key hashes all sampler+texture state, so two distinct
// sampler objects with identical state still resolve to one VkSampler. This memo only