[Perf] (MG_Backend/DirectVulkan): skip the per-draw sampled-texture walk when the bound set is unchanged (texture-bind generation + program state version); CollectSampledTextures 5.0%->0.2%, fps 228->249

MobileGL/MG_Backend/DirectVulkan/Renderer/VulkanRenderer.h

@@ -403,6 +403,20 @@ namespace MobileGL::MG_Backend::DirectVulkan {
         DepthMipmapResources m_depthMipmapResources;
         Vector<DeferredDepthMipmapCleanup> m_deferredDepthMipmapCleanup;
 
+        // Skip the per-draw CollectSampledTextures walk (~5% of the render thread) when the sampled
+        // texture SET is provably unchanged from the previous draw: same program (external index +
+        // backend-state version, which covers sampler-uniform reassignment / relink) and transform
+        // flags, and no texture bind/unbind/delete since (GetTextureBindGeneration). On a hit,
+        // m_sampledTexturesScratch still holds the previous draw's list and steps 2-4 (feedback /
+        // layout probe / transition) re-run on it, so layout correctness is unaffected - only the GL
+        // walk is skipped. Reset per command-buffer recording so a reused program/FBO address can't
+        // outlive a frame.
+        Bool m_lastSampledSetValid = false;
+        Uint m_lastSampledSetProgramIndex = 0;
+        Uint32 m_lastSampledSetProgramVersion = 0;
+        ProgramFactory::CompileOptionFlags m_lastSampledSetTransformFlags = {};
+        Uint64 m_lastSampledSetBindGeneration = 0;
+
         // Per-draw scratch buffers (clear keeps capacity) — these paths run for every
         // draw call and must not allocate.
         Vector<MG_State::GLState::ITextureObject*> m_sampledTexturesScratch;