/* SPDX-FileCopyrightText: 2005 Blender Authors
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */

#include "node_shader_util.hh"

#include "UI_interface_layout.hh"
#include "UI_resources.hh"

namespace blender {

namespace nodes::node_shader_bsdf_glossy_cc {

static void node_declare(NodeDeclarationBuilder &b)
{
  const bNodeTree *ntree = b.tree_or_null();
  const bool is_gpu_internal = ntree && (ntree->flag & NTREE_IS_GPU_SHADER_INTERNAL);

  b.add_input<decl::Color>("Color"_ustr).default_value({0.8f, 0.8f, 0.8f, 1.0f});
  b.add_input<decl::Float>("Roughness"_ustr)
      .default_value(0.5f)
      .min(0.0f)
      .max(1.0f)
      .subtype(PROP_FACTOR);
  b.add_input<decl::Float>("Anisotropy"_ustr).default_value(0.0f).min(-1.0f).max(1.0f);
  b.add_input<decl::Float>("Rotation"_ustr)
      .default_value(0.0f)
      .min(0.0f)
      .max(1.0f)
      .subtype(PROP_FACTOR);
  b.add_input<decl::Vector>("Normal"_ustr).hide_value();
  b.add_input<decl::Vector>("Tangent"_ustr).hide_value();
  b.add_input<decl::Float>("Weight"_ustr).available(is_gpu_internal);
  b.add_output<decl::Shader>("BSDF"_ustr);
}

static void node_shader_buts_glossy(ui::Layout &layout, bContext * /*C*/, PointerRNA *ptr)
{
  layout.prop(ptr, "distribution", ui::ITEM_R_SPLIT_EMPTY_NAME, "", ICON_NONE);
}

static void node_shader_init_glossy(bNodeTree * /*ntree*/, bNode *node)
{
  node->custom1 = SHD_GLOSSY_MULTI_GGX;
}

static int node_shader_gpu_bsdf_glossy(GPUMaterial *mat,
                                       bNode *node,
                                       bNodeExecData * /*execdata*/,
                                       GPUNodeStack *in,
                                       GPUNodeStack *out)
{
  if (!in[4].link) {
    GPU_link(mat, "world_normals_get", &in[4].link);
  }

  GPU_material_flag_set(mat, GPU_MATFLAG_GLOSSY);

  if (in[0].might_be_tinted()) {
    GPU_material_flag_set(mat, GPU_MATFLAG_REFLECTION_MAYBE_COLORED);
  }

  float use_multi_scatter = (node->custom1 == SHD_GLOSSY_MULTI_GGX) ? 1.0f : 0.0f;

  return GPU_stack_link(mat, node, "node_bsdf_glossy", in, out, GPU_constant(&use_multi_scatter));
}

NODE_SHADER_MATERIALX_BEGIN
#ifdef WITH_MATERIALX
{
  if (to_type_ != NodeItem::Type::BSDF) {
    return empty();
  }

  NodeItem color = get_input_value("Color", NodeItem::Type::Color3);
  NodeItem roughness = get_input_value("Roughness", NodeItem::Type::Vector2);
  NodeItem anisotropy = get_input_value("Anisotropy", NodeItem::Type::Color3);
  NodeItem normal = get_input_link("Normal", NodeItem::Type::Vector3);
  NodeItem tangent = get_input_link("Tangent", NodeItem::Type::Vector3);

  NodeItem artistic_ior = create_node("artistic_ior",
                                      NodeItem::Type::Multioutput,
                                      {{"reflectivity", color}, {"edge_color", color}});
  NodeItem ior_out = artistic_ior.add_output("ior", NodeItem::Type::Color3);
  NodeItem extinction_out = artistic_ior.add_output("extinction", NodeItem::Type::Color3);

  return create_node("conductor_bsdf",
                     NodeItem::Type::BSDF,
                     {{"normal", normal},
                      {"tangent", tangent},
                      {"ior", ior_out},
                      {"extinction", extinction_out},
                      {"roughness", roughness}});
}
#endif
NODE_SHADER_MATERIALX_END

}  // namespace nodes::node_shader_bsdf_glossy_cc

/* node type definition */
void register_node_type_sh_bsdf_glossy()
{
  namespace file_ns = nodes::node_shader_bsdf_glossy_cc;

  static bke::bNodeType ntype;

  sh_node_type_base(&ntype, "ShaderNodeBsdfAnisotropic"_ustr, SH_NODE_BSDF_GLOSSY);
  ntype.ui_name = "Glossy BSDF";
  ntype.ui_description =
      "Reflection with microfacet distribution, used for materials such as metal or mirrors";
  ntype.enum_name_legacy = "BSDF_GLOSSY";
  ntype.nclass = NODE_CLASS_SHADER;
  ntype.declare = file_ns::node_declare;
  ntype.gather_link_search_ops = search_link_ops_for_shader_bsdf_node;
  ntype.add_ui_poll = object_shader_nodes_poll;
  ntype.draw_buttons = file_ns::node_shader_buts_glossy;
  ntype.default_width = bke::NodeWidth::_160;
  ntype.initfunc = file_ns::node_shader_init_glossy;
  ntype.gpu_fn = file_ns::node_shader_gpu_bsdf_glossy;
  ntype.materialx_fn = file_ns::node_shader_materialx;

  bke::node_register_type(ntype);

  /* Needed to preserve API compatibility with older versions which had separate
   * Glossy and Anisotropic nodes. */
  bke::node_register_alias(ntype, "ShaderNodeBsdfGlossy"_ustr);
}

}  // namespace blender
