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[Perf] (DirectVulkan): bound vertex-stream conversion by the draw's real fetch range, reuse cached prefixes, pin cached source buffers, and stop repacking client arrays for pointer alignment

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swung0x48
2026-07-20 02:36:25 -04:00
parent 4658536652
commit f0cc07c937
3 changed files with 168 additions and 32 deletions
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MobileGL/MG_Backend/DirectVulkan/Renderer/VertexInputStateFactory.cpp
+6 -1
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@@ -126,8 +126,13 @@ namespace MobileGL::MG_Backend::DirectVulkan {
const Bool packedAttribute = attr.Type == DataType::Int2101010Rev ||
attr.Type == DataType::Uint2101010Rev;
const SizeT requiredAlignment = packedAttribute ? attribByteSize : GetComponentSize(attr.Type);
// For a client-memory array attr.Offset holds the raw client pointer, and the
// draw path re-uploads the data to a 16-aligned transient slice with attribute
// offset 0, so only the stride can violate Vulkan's fetch alignment there.
const Bool clientMemoryAttribute = attr.Buffer == nullptr;
if (conversion == VertexStreamConversion::None && requiredAlignment > 1 &&
((sourceStride % requiredAlignment) != 0 || (attr.Offset % requiredAlignment) != 0)) {
((sourceStride % requiredAlignment) != 0 ||
(!clientMemoryAttribute && (attr.Offset % requiredAlignment) != 0))) {
// GL accepts arbitrary byte strides and offsets. Core Vulkan vertex fetches do not
// unless VK_EXT_legacy_vertex_attributes is available, so deinterleave this one
// attribute into a tightly packed transient stream without changing its format.