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/* SPDX-License-Identifier: Apache-2.0
* Copyright 2022 NVIDIA Corporation
* Copyright 2022 Blender Foundation */
#include "hydra/attribute.h"
#include "scene/attribute.h"
#include "scene/geometry.h"
#include "scene/scene.h"
#include <pxr/base/gf/vec2f.h>
#include <pxr/base/gf/vec3f.h>
#include <pxr/base/gf/vec4f.h>
#include <pxr/base/vt/array.h>
#include <pxr/imaging/hd/tokens.h>
HDCYCLES_NAMESPACE_OPEN_SCOPE
void ApplyPrimvars(AttributeSet &attributes,
const ustring &name,
VtValue value,
AttributeElement elem,
AttributeStandard std)
{
const void *data = HdGetValueData(value);
size_t size = value.GetArraySize();
const HdType valueType = HdGetValueTupleType(value).type;
TypeDesc attrType = CCL_NS::TypeUnknown;
switch (valueType) {
case HdTypeFloat:
attrType = CCL_NS::TypeFloat;
size *= sizeof(float);
break;
case HdTypeFloatVec2:
attrType = CCL_NS::TypeFloat2;
size *= sizeof(float2);
static_assert(sizeof(GfVec2f) == sizeof(float2));
break;
case HdTypeFloatVec3: {
attrType = CCL_NS::TypeVector;
size *= sizeof(float3);
// The Cycles "float3" data type is padded to "float4", so need to convert the array
const auto &valueData = value.Get<VtVec3fArray>();
VtArray<float3> valueConverted;
valueConverted.reserve(valueData.size());
for (const GfVec3f &vec : valueData) {
valueConverted.push_back(make_float3(vec[0], vec[1], vec[2]));
}
data = valueConverted.data();
value = std::move(valueConverted);
break;
}
case HdTypeFloatVec4:
attrType = CCL_NS::TypeFloat4;
size *= sizeof(float4);
static_assert(sizeof(GfVec4f) == sizeof(float4));
break;
default:
TF_WARN("Unsupported attribute type %d", static_cast<int>(valueType));
return;
}
Attribute *const attr = attributes.add(name, attrType, elem);
attr->std = std;
assert(size == attr->buffer.size());
std::memcpy(attr->data(), data, size);
}
HDCYCLES_NAMESPACE_CLOSE_SCOPE
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