blender/intern/cycles/kernel/svm/svm_magic.h

/*
 * 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

/* Magic */

ccl_device_noinline float3 svm_magic(float3 p, int n, float distortion)
{
  float x = sinf((p.x + p.y + p.z) * 5.0f);
  float y = cosf((-p.x + p.y - p.z) * 5.0f);
  float z = -cosf((-p.x - p.y + p.z) * 5.0f);

  if (n > 0) {
    x *= distortion;
    y *= distortion;
    z *= distortion;
    y = -cosf(x - y + z);
    y *= distortion;

    if (n > 1) {
      x = cosf(x - y - z);
      x *= distortion;

      if (n > 2) {
        z = sinf(-x - y - z);
        z *= distortion;

        if (n > 3) {
          x = -cosf(-x + y - z);
          x *= distortion;

          if (n > 4) {
            y = -sinf(-x + y + z);
            y *= distortion;

            if (n > 5) {
              y = -cosf(-x + y + z);
              y *= distortion;

              if (n > 6) {
                x = cosf(x + y + z);
                x *= distortion;

                if (n > 7) {
                  z = sinf(x + y - z);
                  z *= distortion;

                  if (n > 8) {
                    x = -cosf(-x - y + z);
                    x *= distortion;

                    if (n > 9) {
                      y = -sinf(x - y + z);
                      y *= distortion;
                    }
                  }
                }
              }
            }
          }
        }
      }
    }
  }

  if (distortion != 0.0f) {
    distortion *= 2.0f;
    x /= distortion;
    y /= distortion;
    z /= distortion;
  }

  return make_float3(0.5f - x, 0.5f - y, 0.5f - z);
}

ccl_device void svm_node_tex_magic(
    KernelGlobals *kg, ShaderData *sd, float *stack, uint4 node, int *offset)
{
  uint depth;
  uint scale_offset, distortion_offset, co_offset, fac_offset, color_offset;

  decode_node_uchar4(node.y, &depth, &color_offset, &fac_offset, NULL);
  decode_node_uchar4(node.z, &co_offset, &scale_offset, &distortion_offset, NULL);

  uint4 node2 = read_node(kg, offset);
  float3 co = stack_load_float3(stack, co_offset);
  float scale = stack_load_float_default(stack, scale_offset, node2.x);
  float distortion = stack_load_float_default(stack, distortion_offset, node2.y);

  float3 color = svm_magic(co * scale, depth, distortion);

  if (stack_valid(fac_offset))
    stack_store_float(stack, fac_offset, average(color));
  if (stack_valid(color_offset))
    stack_store_float3(stack, color_offset, color);
}

CCL_NAMESPACE_END