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Enable userdata derivatives for interpolated params on GPU #1657

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Mar 22, 2023
Merged

Enable userdata derivatives for interpolated params on GPU #1657

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12 changes: 4 additions & 8 deletions src/liboslexec/llvm_instance.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -279,14 +279,10 @@ BackendLLVM::llvm_type_groupdata()
++order;
for (int i = 0; i < nuserdata; ++i) {
TypeDesc type = types[i];
// NB: Userdata derivs are not currently supported in OptiX, since
// making room for them in the GroupData struct can result in a
// large per-thread memory allocation, which could negatively
// impact performance.
int n = (!use_optix()) ? type.numelements()
* 3 // make room for derivs by default
: type.numelements();
type.arraylen = n;
// make room for float derivs only
type.arraylen = type.basetype == TypeDesc::FLOAT
? type.numelements() * 3
: type.numelements();
fields.push_back(llvm_type(type));
m_groupdata_field_names.emplace_back(
fmtformat("userdata{}_{}_", i, names[i]));
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