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/* SPDX-License-Identifier: Apache-2.0
* Copyright 2011-2022 Blender Foundation */
#pragma once
CCL_NAMESPACE_BEGIN
/* Attributes
*
* We support an arbitrary number of attributes on various mesh elements.
* On vertices, triangles, curve keys, curves, meshes and volume grids.
* Most of the code for attribute reading is in the primitive files.
*
* Lookup of attributes is different between OSL and SVM, as OSL is ustring
* based while for SVM we use integer ids. */
/* Patch index for triangle, -1 if not subdivision triangle */
ccl_device_inline uint subd_triangle_patch(KernelGlobals kg, ccl_private const ShaderData *sd)
{
return (sd->prim != PRIM_NONE) ? kernel_tex_fetch(__tri_patch, sd->prim) : ~0;
}
ccl_device_inline uint attribute_primitive_type(KernelGlobals kg, ccl_private const ShaderData *sd)
{
if ((sd->type & PRIMITIVE_TRIANGLE) && subd_triangle_patch(kg, sd) != ~0) {
return ATTR_PRIM_SUBD;
}
else {
return ATTR_PRIM_GEOMETRY;
}
}
ccl_device_inline AttributeDescriptor attribute_not_found()
{
const AttributeDescriptor desc = {
ATTR_ELEMENT_NONE, (NodeAttributeType)0, 0, ATTR_STD_NOT_FOUND};
return desc;
}
/* Find attribute based on ID */
ccl_device_inline uint object_attribute_map_offset(KernelGlobals kg, int object)
{
return kernel_tex_fetch(__objects, object).attribute_map_offset;
}
ccl_device_inline AttributeDescriptor find_attribute(KernelGlobals kg,
ccl_private const ShaderData *sd,
uint id)
{
if (sd->object == OBJECT_NONE) {
return attribute_not_found();
}
/* for SVM, find attribute by unique id */
uint attr_offset = object_attribute_map_offset(kg, sd->object);
attr_offset += attribute_primitive_type(kg, sd);
uint4 attr_map = kernel_tex_fetch(__attributes_map, attr_offset);
while (attr_map.x != id) {
if (UNLIKELY(attr_map.x == ATTR_STD_NONE)) {
if (UNLIKELY(attr_map.y == 0)) {
return attribute_not_found();
}
else {
/* Chain jump to a different part of the table. */
attr_offset = attr_map.z;
}
}
else {
attr_offset += ATTR_PRIM_TYPES;
}
attr_map = kernel_tex_fetch(__attributes_map, attr_offset);
}
AttributeDescriptor desc;
desc.element = (AttributeElement)attr_map.y;
if (sd->prim == PRIM_NONE && desc.element != ATTR_ELEMENT_MESH &&
desc.element != ATTR_ELEMENT_VOXEL && desc.element != ATTR_ELEMENT_OBJECT) {
return attribute_not_found();
}
/* return result */
desc.offset = (attr_map.y == ATTR_ELEMENT_NONE) ? (int)ATTR_STD_NOT_FOUND : (int)attr_map.z;
desc.type = (NodeAttributeType)(attr_map.w & 0xff);
desc.flags = (AttributeFlag)(attr_map.w >> 8);
return desc;
}
/* Transform matrix attribute on meshes */
ccl_device Transform primitive_attribute_matrix(KernelGlobals kg,
ccl_private const ShaderData *sd,
const AttributeDescriptor desc)
{
Transform tfm;
tfm.x = kernel_tex_fetch(__attributes_float4, desc.offset + 0);
tfm.y = kernel_tex_fetch(__attributes_float4, desc.offset + 1);
tfm.z = kernel_tex_fetch(__attributes_float4, desc.offset + 2);
return tfm;
}
CCL_NAMESPACE_END
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