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

#include "node_shader_util.hh"

#include "DNA_customdata_types.h"

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

namespace blender {

namespace nodes::node_shader_tex_coord_cc {

static void node_declare(NodeDeclarationBuilder &b)
{
  b.add_output<decl::Vector>("Generated"_ustr).translation_context(BLT_I18NCONTEXT_ID_TEXTURE);
  b.add_output<decl::Vector>("Normal"_ustr);
  b.add_output<decl::Vector>("UV"_ustr);
  b.add_output<decl::Vector>("Object"_ustr);
  b.add_output<decl::Vector>("Camera"_ustr);
  b.add_output<decl::Vector>("Window"_ustr);
  b.add_output<decl::Vector>("Reflection"_ustr);
}

static void node_shader_buts_tex_coord(ui::Layout &layout, bContext * /*C*/, PointerRNA *ptr)
{
  layout.prop(ptr, "object", ui::ITEM_R_SPLIT_EMPTY_NAME, "", ICON_NONE);
  layout.prop(ptr, "from_instancer", ui::ITEM_R_SPLIT_EMPTY_NAME, std::nullopt, ICON_NONE);
}

static int node_shader_gpu_tex_coord(GPUMaterial *mat,
                                     bNode *node,
                                     bNodeExecData * /*execdata*/,
                                     GPUNodeStack *in,
                                     GPUNodeStack *out)
{
  Object *ob = (Object *)node->id;

  /* Use special matrix to let the shader branch to using the render object's matrix. */
  float dummy_matrix[4][4];
  dummy_matrix[3][3] = 0.0f;
  GPUNodeLink *inv_obmat = (ob != nullptr) ? GPU_uniform(&ob->world_to_object()[0][0]) :
                                             GPU_uniform(&dummy_matrix[0][0]);

  /* Optimization: don't request orco if not needed. */
  float4 zero(0.0f);
  GPUNodeLink *orco = out[0].hasoutput ? GPU_attribute(mat, CD_ORCO, "") : GPU_constant(zero);
  GPUNodeLink *mtface = GPU_attribute(mat, CD_AUTO_FROM_NAME, "");

  GPU_stack_link(mat, node, "node_tex_coord", in, out, inv_obmat, orco, mtface);

  for (const auto [i, sock] : node->outputs.enumerate()) {
    node_shader_gpu_bump_tex_coord(mat, node, &out[i].link);
    /* Normalize some vectors after dFdx/dFdy offsets.
     * This is the case for interpolated, non linear functions.
     * The resulting vector can still be a bit wrong but not as much.
     * (see #70644) */
    if (ELEM(i, 1, 6)) {
      GPU_link(mat,
               "vector_math_normalize",
               out[i].link,
               out[i].link,
               out[i].link,
               out[i].link,
               &out[i].link,
               nullptr);
    }
  }

  return 1;
}

NODE_SHADER_MATERIALX_BEGIN
#ifdef WITH_MATERIALX
{
  /* NOTE: Some outputs aren't supported by MaterialX. */
  NodeItem res = empty();
  std::string name = socket_out_->identifier;

  if (ELEM(name, "Generated", "UV")) {
    res = texcoord_node();
  }
  else if (name == "Normal") {
    res = create_node("normal", NodeItem::Type::Vector3, {{"space", val(std::string("world"))}});
  }
  else if (name == "Object") {
    res = create_node(
        "position", NodeItem::Type::Vector3, {{"space", val(std::string("object"))}});
  }
  else {
    res = get_output_default(name, NodeItem::Type::Any);
  }

  return res;
}
#endif
NODE_SHADER_MATERIALX_END

}  // namespace nodes::node_shader_tex_coord_cc

/* node type definition */
void register_node_type_sh_tex_coord()
{
  namespace file_ns = nodes::node_shader_tex_coord_cc;

  static bke::bNodeType ntype;

  sh_node_type_base(&ntype, "ShaderNodeTexCoord"_ustr, SH_NODE_TEX_COORD);
  ntype.ui_name = "Texture Coordinate";
  ntype.ui_description =
      "Retrieve multiple types of texture coordinates.\nTypically used as inputs for texture "
      "nodes";
  ntype.enum_name_legacy = "TEX_COORD";
  ntype.nclass = NODE_CLASS_INPUT;
  ntype.declare = file_ns::node_declare;
  ntype.draw_buttons = file_ns::node_shader_buts_tex_coord;
  ntype.gpu_fn = file_ns::node_shader_gpu_tex_coord;
  ntype.materialx_fn = file_ns::node_shader_materialx;

  bke::node_register_type(ntype);
}

}  // namespace blender
