blender/intern/cycles/kernel/svm/svm_attribute.h
Ton Roosendaal da376e0237 Cycles render engine, initial commit. This is the engine itself, blender modifications and build instructions will follow later.
Cycles uses code from some great open source projects, many thanks them:

* BVH building and traversal code from NVidia's "Understanding the Efficiency of Ray Traversal on GPUs":
http://code.google.com/p/understanding-the-efficiency-of-ray-traversal-on-gpus/
* Open Shading Language for a large part of the shading system:
http://code.google.com/p/openshadinglanguage/
* Blender for procedural textures and a few other nodes.
* Approximate Catmull Clark subdivision from NVidia Mesh tools:
http://code.google.com/p/nvidia-mesh-tools/
* Sobol direction vectors from:
http://web.maths.unsw.edu.au/~fkuo/sobol/
* Film response functions from:
http://www.cs.columbia.edu/CAVE/software/softlib/dorf.php
2011-04-27 11:58:34 +00:00

155 lines
4.6 KiB
C

/*
* Copyright 2011, Blender Foundation.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
CCL_NAMESPACE_BEGIN
/* Attribute Node */
__device void svm_node_attr_init(KernelGlobals *kg, ShaderData *sd,
uint4 node, NodeAttributeType *type,
NodeAttributeType *mesh_type, AttributeElement *elem, uint *offset, uint *out_offset)
{
if(sd->object != ~0) {
/* find attribute by unique id */
uint id = node.y;
uint attr_offset = sd->object*kernel_data.bvh.attributes_map_stride;
uint4 attr_map = kernel_tex_fetch(__attributes_map, attr_offset);
while(attr_map.x != id)
attr_map = kernel_tex_fetch(__attributes_map, ++attr_offset);
/* return result */
*elem = (AttributeElement)attr_map.y;
*offset = 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;
}
__device void svm_node_attr(KernelGlobals *kg, ShaderData *sd, float *stack, uint4 node)
{
NodeAttributeType type, mesh_type;
AttributeElement elem;
uint offset, out_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 = triangle_attribute_float(kg, sd, elem, offset, NULL, NULL);
stack_store_float(stack, out_offset, f);
}
else {
float3 f = triangle_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 = triangle_attribute_float3(kg, sd, elem, offset, NULL, NULL);
stack_store_float3(stack, out_offset, f);
}
else {
float f = triangle_attribute_float(kg, sd, elem, offset, NULL, NULL);
stack_store_float3(stack, out_offset, make_float3(f, f, f));
}
}
}
__device void svm_node_attr_bump_dx(KernelGlobals *kg, ShaderData *sd, float *stack, uint4 node)
{
NodeAttributeType type, mesh_type;
AttributeElement elem;
uint offset, out_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 = triangle_attribute_float(kg, sd, elem, offset, &dx, NULL);
stack_store_float(stack, out_offset, f+dx);
}
else {
float3 dx;
float3 f = triangle_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 = triangle_attribute_float3(kg, sd, elem, offset, &dx, NULL);
stack_store_float3(stack, out_offset, f+dx);
}
else {
float dx;
float f = triangle_attribute_float(kg, sd, elem, offset, &dx, NULL);
stack_store_float3(stack, out_offset, make_float3(f+dx, f+dx, f+dx));
}
}
}
__device void svm_node_attr_bump_dy(KernelGlobals *kg, ShaderData *sd, float *stack, uint4 node)
{
NodeAttributeType type, mesh_type;
AttributeElement elem;
uint offset, out_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 = triangle_attribute_float(kg, sd, elem, offset, NULL, &dy);
stack_store_float(stack, out_offset, f+dy);
}
else {
float3 dy;
float3 f = triangle_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 = triangle_attribute_float3(kg, sd, elem, offset, NULL, &dy);
stack_store_float3(stack, out_offset, f+dy);
}
else {
float dy;
float f = triangle_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