blender/intern/cycles/kernel/svm/svm_attribute.h
Brecht Van Lommel 27043b8e40 Cycles code internals: add support for mesh voxel grid attributes.
These are internally stored as a 3D image textures, but accessible like e.g.
UV coordinates though the attribute node and getattribute().

This is convenient for rendering e.g. smoke objects where data like density is
really a property of the mesh, and it avoids having to specify the smoke object
in a texture node, instead the material will work with any smoke domain.
2014-03-29 13:03:48 +01:00

161 lines
4.6 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
/* Attribute Node */
ccl_device void svm_node_attr_init(KernelGlobals *kg, ShaderData *sd,
uint4 node, NodeAttributeType *type,
NodeAttributeType *mesh_type, AttributeElement *elem, int *offset, uint *out_offset)
{
if(sd->object != OBJECT_NONE) {
/* find attribute by unique id */
uint id = node.y;
uint attr_offset = sd->object*kernel_data.bvh.attributes_map_stride;
#ifdef __HAIR__
attr_offset = (sd->type & PRIMITIVE_ALL_CURVE)? attr_offset + ATTR_PRIM_CURVE: attr_offset;
#endif
uint4 attr_map = kernel_tex_fetch(__attributes_map, attr_offset);
while(attr_map.x != id) {
attr_offset += ATTR_PRIM_TYPES;
attr_map = kernel_tex_fetch(__attributes_map, attr_offset);
}
/* return result */
*elem = (AttributeElement)attr_map.y;
*offset = as_int(attr_map.z);
*mesh_type = (NodeAttributeType)attr_map.w;
}
else {
/* background */
*elem = ATTR_ELEMENT_NONE;
*offset = 0;
*mesh_type = (NodeAttributeType)node.w;
}
*out_offset = node.z;
*type = (NodeAttributeType)node.w;
}
ccl_device void svm_node_attr(KernelGlobals *kg, ShaderData *sd, float *stack, uint4 node)
{
NodeAttributeType type, mesh_type;
AttributeElement elem;
uint out_offset;
int offset;
svm_node_attr_init(kg, sd, node, &type, &mesh_type, &elem, &offset, &out_offset);
/* fetch and store attribute */
if(type == NODE_ATTR_FLOAT) {
if(mesh_type == NODE_ATTR_FLOAT) {
float f = primitive_attribute_float(kg, sd, elem, offset, NULL, NULL);
stack_store_float(stack, out_offset, f);
}
else {
float3 f = primitive_attribute_float3(kg, sd, elem, offset, NULL, NULL);
stack_store_float(stack, out_offset, average(f));
}
}
else {
if(mesh_type == NODE_ATTR_FLOAT3) {
float3 f = primitive_attribute_float3(kg, sd, elem, offset, NULL, NULL);
stack_store_float3(stack, out_offset, f);
}
else {
float f = primitive_attribute_float(kg, sd, elem, offset, NULL, NULL);
stack_store_float3(stack, out_offset, make_float3(f, f, f));
}
}
}
ccl_device void svm_node_attr_bump_dx(KernelGlobals *kg, ShaderData *sd, float *stack, uint4 node)
{
NodeAttributeType type, mesh_type;
AttributeElement elem;
uint out_offset;
int offset;
svm_node_attr_init(kg, sd, node, &type, &mesh_type, &elem, &offset, &out_offset);
/* fetch and store attribute */
if(type == NODE_ATTR_FLOAT) {
if(mesh_type == NODE_ATTR_FLOAT) {
float dx;
float f = primitive_attribute_float(kg, sd, elem, offset, &dx, NULL);
stack_store_float(stack, out_offset, f+dx);
}
else {
float3 dx;
float3 f = primitive_attribute_float3(kg, sd, elem, offset, &dx, NULL);
stack_store_float(stack, out_offset, average(f+dx));
}
}
else {
if(mesh_type == NODE_ATTR_FLOAT3) {
float3 dx;
float3 f = primitive_attribute_float3(kg, sd, elem, offset, &dx, NULL);
stack_store_float3(stack, out_offset, f+dx);
}
else {
float dx;
float f = primitive_attribute_float(kg, sd, elem, offset, &dx, NULL);
stack_store_float3(stack, out_offset, make_float3(f+dx, f+dx, f+dx));
}
}
}
ccl_device void svm_node_attr_bump_dy(KernelGlobals *kg, ShaderData *sd, float *stack, uint4 node)
{
NodeAttributeType type, mesh_type;
AttributeElement elem;
uint out_offset;
int offset;
svm_node_attr_init(kg, sd, node, &type, &mesh_type, &elem, &offset, &out_offset);
/* fetch and store attribute */
if(type == NODE_ATTR_FLOAT) {
if(mesh_type == NODE_ATTR_FLOAT) {
float dy;
float f = primitive_attribute_float(kg, sd, elem, offset, NULL, &dy);
stack_store_float(stack, out_offset, f+dy);
}
else {
float3 dy;
float3 f = primitive_attribute_float3(kg, sd, elem, offset, NULL, &dy);
stack_store_float(stack, out_offset, average(f+dy));
}
}
else {
if(mesh_type == NODE_ATTR_FLOAT3) {
float3 dy;
float3 f = primitive_attribute_float3(kg, sd, elem, offset, NULL, &dy);
stack_store_float3(stack, out_offset, f+dy);
}
else {
float dy;
float f = primitive_attribute_float(kg, sd, elem, offset, NULL, &dy);
stack_store_float3(stack, out_offset, make_float3(f+dy, f+dy, f+dy));
}
}
}
CCL_NAMESPACE_END