node_shader_layer_weight.cc

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/* SPDX-FileCopyrightText: 2005 Blender Authors
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */
 
#include "node_shader_util.hh"
 
namespace blender::nodes::node_shader_layer_weight_cc {
 
static void node_declare(NodeDeclarationBuilder &b)
{
  b.add_input<decl::Float>("Blend").default_value(0.5f).min(0.0f).max(1.0f);
  b.add_input<decl::Vector>("Normal").hide_value();
  b.add_output<decl::Float>("Fresnel");
  b.add_output<decl::Float>("Facing");
}
 
static int node_shader_gpu_layer_weight(GPUMaterial *mat,
                                        bNode *node,
                                        bNodeExecData * /*execdata*/,
                                        GPUNodeStack *in,
                                        GPUNodeStack *out)
{
  if (!in[1].link) {
    GPU_link(mat, "world_normals_get", &in[1].link);
  }
 
  return GPU_stack_link(mat, node, "node_layer_weight", in, out);
}
 
NODE_SHADER_MATERIALX_BEGIN
#ifdef WITH_MATERIALX
{
  /* TODO: some outputs expected be implemented partially within the next iteration
   * (see node-definition `<artistic_ior>`). */
  return get_input_link("Blend", NodeItem::Type::Float);
}
#endif
NODE_SHADER_MATERIALX_END
 
}  // namespace blender::nodes::node_shader_layer_weight_cc
 
/* node type definition */
void register_node_type_sh_layer_weight()
{
  namespace file_ns = blender::nodes::node_shader_layer_weight_cc;
 
  static blender::bke::bNodeType ntype;
 
  sh_node_type_base(&ntype, "ShaderNodeLayerWeight", SH_NODE_LAYER_WEIGHT);
  ntype.ui_name = "Layer Weight";
  ntype.ui_description =
      "Produce a blending factor depending on the angle between the surface normal and the view "
      "direction.\nTypically used for layering shaders with the Mix Shader node";
  ntype.enum_name_legacy = "LAYER_WEIGHT";
  ntype.nclass = NODE_CLASS_INPUT;
  ntype.declare = file_ns::node_declare;
  ntype.gpu_fn = file_ns::node_shader_gpu_layer_weight;
  ntype.materialx_fn = file_ns::node_shader_materialx;
 
  blender::bke::node_register_type(ntype);
}