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/*
* Copyright 2011-2013 Blender Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
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. */
ccl_device_inline uint subd_triangle_patch(KernelGlobals *kg, const ShaderData *sd);
ccl_device_inline uint attribute_primitive_type(KernelGlobals *kg, const ShaderData *sd)
{
#ifdef __HAIR__
if(ccl_fetch(sd, type) & PRIMITIVE_ALL_CURVE) {
return ATTR_PRIM_CURVE;
}
else
#endif
if(subd_triangle_patch(kg, sd) != ~0) {
return ATTR_PRIM_SUBD;
}
else {
return ATTR_PRIM_TRIANGLE;
}
}
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 AttributeDescriptor find_attribute(KernelGlobals *kg, const ShaderData *sd, uint id)
{
if(ccl_fetch(sd, object) == PRIM_NONE) {
return attribute_not_found();
}
/* for SVM, find attribute by unique id */
uint attr_offset = ccl_fetch(sd, object)*kernel_data.bvh.attributes_map_stride;
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)) {
return attribute_not_found();
}
attr_offset += ATTR_PRIM_TYPES;
attr_map = kernel_tex_fetch(__attributes_map, attr_offset);
}
AttributeDescriptor desc;
desc.element = (AttributeElement)attr_map.y;
if(ccl_fetch(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, const ShaderData *sd, const AttributeDescriptor desc)
{
Transform tfm;
tfm.x = kernel_tex_fetch(__attributes_float3, desc.offset + 0);
tfm.y = kernel_tex_fetch(__attributes_float3, desc.offset + 1);
tfm.z = kernel_tex_fetch(__attributes_float3, desc.offset + 2);
tfm.w = kernel_tex_fetch(__attributes_float3, desc.offset + 3);
return tfm;
}
CCL_NAMESPACE_END
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