/* SPDX-License-Identifier: GPL-2.0-or-later
 * Copyright 2006 Blender Foundation. All rights reserved. */

/** \file
 * \ingroup cmpnodes
 */

#include "GPU_material.h"

#include "COM_shader_node.hh"

#include "NOD_math_functions.hh"

#include "node_composite_util.hh"

/* **************** SCALAR MATH ******************** */

namespace blender::nodes::node_composite_math_cc {

static void cmp_node_math_declare(NodeDeclarationBuilder &b)
{
  b.add_input<decl::Float>(N_("Value"))
      .default_value(0.5f)
      .min(-10000.0f)
      .max(10000.0f)
      .compositor_domain_priority(0);
  b.add_input<decl::Float>(N_("Value"), "Value_001")
      .default_value(0.5f)
      .min(-10000.0f)
      .max(10000.0f)
      .compositor_domain_priority(1);
  b.add_input<decl::Float>(N_("Value"), "Value_002")
      .default_value(0.5f)
      .min(-10000.0f)
      .max(10000.0f)
      .compositor_domain_priority(2);
  b.add_output<decl::Float>(N_("Value"));
}

using namespace blender::realtime_compositor;

class MathShaderNode : public ShaderNode {
 public:
  using ShaderNode::ShaderNode;

  void compile(GPUMaterial *material) override
  {
    GPUNodeStack *inputs = get_inputs_array();
    GPUNodeStack *outputs = get_outputs_array();

    GPU_stack_link(material, &bnode(), get_shader_function_name(), inputs, outputs);

    if (!get_should_clamp()) {
      return;
    }

    const float min = 0.0f;
    const float max = 1.0f;
    GPU_link(material,
             "clamp_value",
             get_output("Value").link,
             GPU_constant(&min),
             GPU_constant(&max),
             &get_output("Value").link);
  }

  NodeMathOperation get_operation()
  {
    return (NodeMathOperation)bnode().custom1;
  }

  const char *get_shader_function_name()
  {
    return get_float_math_operation_info(get_operation())->shader_name.c_str();
  }

  bool get_should_clamp()
  {
    return bnode().custom2 & SHD_MATH_CLAMP;
  }
};

static ShaderNode *get_compositor_shader_node(DNode node)
{
  return new MathShaderNode(node);
}

}  // namespace blender::nodes::node_composite_math_cc

void register_node_type_cmp_math()
{
  namespace file_ns = blender::nodes::node_composite_math_cc;

  static bNodeType ntype;

  cmp_node_type_base(&ntype, CMP_NODE_MATH, "Math", NODE_CLASS_CONVERTER);
  ntype.declare = file_ns::cmp_node_math_declare;
  ntype.labelfunc = node_math_label;
  node_type_update(&ntype, node_math_update);
  ntype.get_compositor_shader_node = file_ns::get_compositor_shader_node;

  nodeRegisterType(&ntype);
}