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[Perf] (MG_Backend/DirectVulkan, MG_State): stop re-deriving per-draw state

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- Memoize the program content hash on ProgramObject (keyed by the backend
  state version + compile flags; relinking and binding changes invalidate
  it) and the vertex-input hash on VertexArrayObject (keyed by a new
  aggregate config version bumped by every attribute mutation). Full-SPIRV
  XXH64 hashing fell from 13.7% to 1.4% of the render thread.
- ProgramObject also gains a link version and a global-UBO content version
  (bumped by uniform writes and on relink, wrap-safe around the backends'
  "never uploaded" sentinel) for backends to gate uploads and link caches.
- Reuse member scratch vectors in SetupDraw, UploadAndBindVertexBuffers,
  GetOrCreatePipeline and BindProgramUniformBuffers instead of allocating
  per draw (~12% of render-thread time was in the allocator).
- Replace hot-path dynamic_cast with AsMipmapTexture (storage-type tag +
  static_cast); TextureObjectMipmap is the only Mipmap-tagged branch.
- Register/prune texture aliases only when a new (texture, lifetimeId)
  identity appears instead of scanning the entire alive map on every
  sampled-texture sync.
- Make the fallback VkPresentModeKHR log strings report the actual mode.

Vanilla render-thread share of libMobileGL dropped from 48% to 35% on
DirectVulkan (simpleperf, Adreno 830).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
swung0x48
2026-07-09 12:12:50 +00:00
co-authored by Claude Fable 5
parent 08e808ef20
commit bd208783d7
15 changed files with 166 additions and 24 deletions
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MobileGL/MG_Backend/DirectVulkan/Renderer/UniformManager.h
+8
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@@ -113,6 +113,14 @@ namespace MobileGL::MG_Backend::DirectVulkan {
VkTextureManager* m_textureManager = nullptr;
VkSamplerManager* m_samplerManager = nullptr;
mutable SharedPtr<MG_State::GLState::ITextureObject> m_fallbackTexture2D;
// Per-draw scratch buffers for BindProgramUniformBuffers: reused (clear keeps
// capacity) so the descriptor-write path stops allocating on every draw.
Vector<VkWriteDescriptorSet> m_writesScratch;
Vector<VkDescriptorBufferInfo> m_bufferInfosScratch;
Vector<VkDescriptorImageInfo> m_imageInfosScratch;
Vector<VkBufferView> m_texelBufferViewsScratch;
Vector<Uint32> m_dynamicOffsetsScratch;
};
} // namespace MobileGL::MG_Backend::DirectVulkan