node_composite_premulkey.cc

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/* SPDX-FileCopyrightText: 2006 Blender Authors
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */

 
#include "BLI_math_vector_types.hh"
 
#include "FN_multi_function_builder.hh"
 
#include "NOD_multi_function.hh"
 
#include "GPU_material.hh"
 
#include "node_composite_util.hh"
 
namespace blender::nodes::node_composite_premulkey_cc {
 
static const EnumPropertyItem type_items[] = {
    {CMP_NODE_ALPHA_CONVERT_PREMULTIPLY,
     "STRAIGHT_TO_PREMULTIPLIED",
     0,
     N_("To Premultiplied"),
     N_("Convert straight to premultiplied")},
    {CMP_NODE_ALPHA_CONVERT_UNPREMULTIPLY,
     "PREMULTIPLIED_TO_STRAIGHT",
     0,
     N_("To Straight"),
     N_("Convert premultiplied to straight")},
    {0, nullptr, 0, nullptr, nullptr},
};
 
static void cmp_node_premulkey_declare(NodeDeclarationBuilder &b)
{
  b.use_custom_socket_order();
  b.allow_any_socket_order();
  b.is_function_node();
  b.add_input<decl::Color>("Image").default_value({1.0f, 1.0f, 1.0f, 1.0f}).hide_value();
  b.add_output<decl::Color>("Image").align_with_previous();
 
  b.add_input<decl::Menu>("Type")
      .default_value(CMP_NODE_ALPHA_CONVERT_PREMULTIPLY)
      .static_items(type_items)
      .optional_label();
}
 
using namespace blender::compositor;
 
static int node_gpu_material(GPUMaterial *material,
                             bNode *node,
                             bNodeExecData * /*execdata*/,
                             GPUNodeStack *inputs,
                             GPUNodeStack *outputs)
{
  return GPU_stack_link(material, node, "node_composite_convert_alpha", inputs, outputs);
}
 
static void node_build_multi_function(blender::nodes::NodeMultiFunctionBuilder &builder)
{
  static auto function = mf::build::SI2_SO<float4, MenuValue, float4>(
      "Alpha Convert",
      [](const float4 color, const MenuValue type) -> float4 {
        switch (CMPNodeAlphaConvertMode(type.value)) {
          case CMP_NODE_ALPHA_CONVERT_PREMULTIPLY:
            return float4(color.xyz() * color.w, color.w);
          case CMP_NODE_ALPHA_CONVERT_UNPREMULTIPLY:
            return color.w == 0.0f ? color : float4(color.xyz() / color.w, color.w);
        }
        return color;
      },
      mf::build::exec_presets::AllSpanOrSingle());
  builder.set_matching_fn(function);
}
 
}  // namespace blender::nodes::node_composite_premulkey_cc
 
static void register_node_type_cmp_premulkey()
{
  namespace file_ns = blender::nodes::node_composite_premulkey_cc;
 
  static blender::bke::bNodeType ntype;
 
  cmp_node_type_base(&ntype, "CompositorNodePremulKey", CMP_NODE_PREMULKEY);
  ntype.ui_name = "Alpha Convert";
  ntype.ui_description = "Convert to and from premultiplied (associated) alpha";
  ntype.enum_name_legacy = "PREMULKEY";
  ntype.nclass = NODE_CLASS_CONVERTER;
  ntype.declare = file_ns::cmp_node_premulkey_declare;
  ntype.gpu_fn = file_ns::node_gpu_material;
  ntype.build_multi_function = file_ns::node_build_multi_function;
 
  blender::bke::node_register_type(ntype);
}
NOD_REGISTER_NODE(register_node_type_cmp_premulkey)