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/*
* 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
/* Distorted Noise (variable lacunarity noise) */
__device_noinline float svm_distorted_noise(float3 p, float size, NodeNoiseBasis basis, NodeNoiseBasis distortion_basis, float distortion)
{
float3 r;
float3 offset = make_float3(13.5f, 13.5f, 13.5f);
p /= size;
r.x = noise_basis(p + offset, basis) * distortion;
r.y = noise_basis(p, basis) * distortion;
r.z = noise_basis(p - offset, basis) * distortion;
return noise_basis(p + r, distortion_basis); /* distorted-domain noise */
}
__device void svm_node_tex_distorted_noise(KernelGlobals *kg, ShaderData *sd, float *stack, uint4 node, int *offset)
{
uint4 node2 = read_node(kg, offset);
uint basis, distortion_basis;
uint size_offset, distortion_offset, co_offset, fac_offset;
decode_node_uchar4(node.y, &basis, &distortion_basis, NULL, NULL);
decode_node_uchar4(node.z, &size_offset, &distortion_offset, &co_offset, &fac_offset);
float3 co = stack_load_float3(stack, co_offset);
float size = stack_load_float_default(stack, size_offset, node2.x);
float distortion = stack_load_float_default(stack, distortion_offset, node2.y);
size = nonzerof(size, 1e-5f);
float f = svm_distorted_noise(co, size, (NodeNoiseBasis)basis,
(NodeNoiseBasis)distortion_basis, distortion);
stack_store_float(stack, fac_offset, f);
}
CCL_NAMESPACE_END
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