vector_rotate.h

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/* SPDX-FileCopyrightText: 2011-2022 Blender Foundation
 *
 * SPDX-License-Identifier: Apache-2.0 */
 
#pragma once
 
CCL_NAMESPACE_BEGIN
 
/* Vector Rotate */
 
ccl_device_noinline void svm_node_vector_rotate(ccl_private ShaderData *sd,
                                                ccl_private float *stack,
                                                uint input_stack_offsets,
                                                uint axis_stack_offsets,
                                                uint result_stack_offset)
{
  uint type, vector_stack_offset, rotation_stack_offset, center_stack_offset, axis_stack_offset,
      angle_stack_offset, invert;
 
  svm_unpack_node_uchar4(
      input_stack_offsets, &type, &vector_stack_offset, &rotation_stack_offset, &invert);
  svm_unpack_node_uchar3(
      axis_stack_offsets, &center_stack_offset, &axis_stack_offset, &angle_stack_offset);
 
  if (stack_valid(result_stack_offset)) {
 
    float3 vector = stack_load_float3(stack, vector_stack_offset);
    float3 center = stack_load_float3(stack, center_stack_offset);
    float3 result = make_float3(0.0f, 0.0f, 0.0f);
 
    if (type == NODE_VECTOR_ROTATE_TYPE_EULER_XYZ) {
      float3 rotation = stack_load_float3(stack, rotation_stack_offset);  // Default XYZ.
      Transform rotationTransform = euler_to_transform(rotation);
      if (invert) {
        result = transform_direction_transposed(&rotationTransform, vector - center) + center;
      }
      else {
        result = transform_direction(&rotationTransform, vector - center) + center;
      }
    }
    else {
      float3 axis;
      float axis_length;
      switch (type) {
        case NODE_VECTOR_ROTATE_TYPE_AXIS_X:
          axis = make_float3(1.0f, 0.0f, 0.0f);
          axis_length = 1.0f;
          break;
        case NODE_VECTOR_ROTATE_TYPE_AXIS_Y:
          axis = make_float3(0.0f, 1.0f, 0.0f);
          axis_length = 1.0f;
          break;
        case NODE_VECTOR_ROTATE_TYPE_AXIS_Z:
          axis = make_float3(0.0f, 0.0f, 1.0f);
          axis_length = 1.0f;
          break;
        default:
          axis = stack_load_float3(stack, axis_stack_offset);
          axis_length = len(axis);
          break;
      }
      float angle = stack_load_float(stack, angle_stack_offset);
      angle = invert ? -angle : angle;
      result = (axis_length != 0.0f) ?
                   rotate_around_axis(vector - center, axis / axis_length, angle) + center :
                   vector;
    }
 
    stack_store_float3(stack, result_stack_offset, result);
  }
}
 
CCL_NAMESPACE_END