/*
 * 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

/* Wave */

ccl_device_noinline float svm_wave(NodeWaveType type,
                                   NodeWaveProfile profile,
                                   float3 p,
                                   float detail,
                                   float distortion,
                                   float dscale)
{
  float n;

  if (type == NODE_WAVE_BANDS)
    n = (p.x + p.y + p.z) * 10.0f;
  else /* NODE_WAVE_RINGS */
    n = len(p) * 20.0f;

  if (distortion != 0.0f)
    n += distortion * noise_turbulence(p * dscale, detail, 0);

  if (profile == NODE_WAVE_PROFILE_SIN) {
    return 0.5f + 0.5f * sinf(n);
  }
  else { /* NODE_WAVE_PROFILE_SAW */
    n /= M_2PI_F;
    n -= (int)n;
    return (n < 0.0f) ? n + 1.0f : n;
  }
}

ccl_device void svm_node_tex_wave(
    KernelGlobals *kg, ShaderData *sd, float *stack, uint4 node, int *offset)
{
  uint4 node2 = read_node(kg, offset);

  uint type;
  uint co_offset, scale_offset, detail_offset, dscale_offset, distortion_offset, color_offset,
      fac_offset;

  decode_node_uchar4(node.y, &type, &color_offset, &fac_offset, &dscale_offset);
  decode_node_uchar4(node.z, &co_offset, &scale_offset, &detail_offset, &distortion_offset);

  float3 co = stack_load_float3(stack, co_offset);
  float scale = stack_load_float_default(stack, scale_offset, node2.x);
  float detail = stack_load_float_default(stack, detail_offset, node2.y);
  float distortion = stack_load_float_default(stack, distortion_offset, node2.z);
  float dscale = stack_load_float_default(stack, dscale_offset, node2.w);

  float f = svm_wave(
      (NodeWaveType)type, (NodeWaveProfile)node.w, co * scale, detail, distortion, dscale);

  if (stack_valid(fac_offset))
    stack_store_float(stack, fac_offset, f);
  if (stack_valid(color_offset))
    stack_store_float3(stack, color_offset, make_float3(f, f, f));
}

CCL_NAMESPACE_END
