Alexander Gavrilov
b7558e3c9c
The existing code for this was incomplete. Each instance can now have a set of attributes stored separately from geometry attributes. Geometry attributes take precedence over instance attributes. Ref D2057
115 lines
3.6 KiB
C++
115 lines
3.6 KiB
C++
/*
|
|
* 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)
|
|
{
|
|
if ((sd->type & PRIMITIVE_ALL_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,
|
|
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,
|
|
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);
|
|
|
|
return tfm;
|
|
}
|
|
|
|
CCL_NAMESPACE_END
|