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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
/* Bump Node */
ccl_device void svm_node_set_bump(KernelGlobals *kg, ShaderData *sd, float *stack, uint4 node)
{
#ifdef __RAY_DIFFERENTIALS__
/* get normal input */
uint normal_offset, distance_offset, invert;
decode_node_uchar4(node.y, &normal_offset, &distance_offset, &invert, NULL);
float3 normal_in = stack_valid(normal_offset)? stack_load_float3(stack, normal_offset): sd->N;
/* get surface tangents from normal */
float3 Rx = cross(sd->dP.dy, normal_in);
float3 Ry = cross(normal_in, sd->dP.dx);
/* get bump values */
uint c_offset, x_offset, y_offset, strength_offset;
decode_node_uchar4(node.z, &c_offset, &x_offset, &y_offset, &strength_offset);
float h_c = stack_load_float(stack, c_offset);
float h_x = stack_load_float(stack, x_offset);
float h_y = stack_load_float(stack, y_offset);
/* compute surface gradient and determinant */
float det = dot(sd->dP.dx, Rx);
float3 surfgrad = (h_x - h_c)*Rx + (h_y - h_c)*Ry;
float absdet = fabsf(det);
float strength = stack_load_float(stack, strength_offset);
float distance = stack_load_float(stack, distance_offset);
if(invert)
distance *= -1.0f;
strength = max(strength, 0.0f);
/* compute and output perturbed normal */
float3 normal_out = normalize(absdet*normal_in - distance*signf(det)*surfgrad);
normal_out = normalize(strength*normal_out + (1.0f - strength)*normal_in);
stack_store_float3(stack, node.w, normal_out);
#endif
}
/* Displacement Node */
ccl_device void svm_node_set_displacement(ShaderData *sd, float *stack, uint fac_offset)
{
float d = stack_load_float(stack, fac_offset);
sd->P += sd->N*d*0.1f; /* todo: get rid of this factor */
}
CCL_NAMESPACE_END
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