fix(optix): fix userdata derivatives for interpolated params on GPU (#…

…1685) Following #1657, it turns out we forgot to zero initialize the userdata derivatives for the optix path. This leads to some rendering glitches caused by the memory garbage left in those derivatives. Signed-off-by: Pascal Lecocq <[email protected]> Co-authored-by: Pascal Lecocq <[email protected]>
AcademySoftwareFoundation · May 20, 2023 · 5c49a7c · 5c49a7c
1 parent abdc966
commit 5c49a7c
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/src/liboslexec/llvm_instance.cpp b/src/liboslexec/llvm_instance.cpp
@@ -563,6 +563,8 @@ BackendLLVM::llvm_assign_initial_value(const Symbol& sym, bool force)
             llvm::Value* dst = llvm_void_ptr(sym);
             TypeDesc t       = sym.typespec().simpletype();
             ll.op_memcpy(dst, src, t.size(), t.basesize());
+            if (sym.has_derivs())
+                llvm_zero_derivs(sym);
 #endif
         } else if (!sym.lockgeom() && !sym.typespec().is_closure()) {
             // geometrically-varying param; memcpy its default value