node_composite_mixrgb.cc

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/* SPDX-FileCopyrightText: 2006 Blender Authors
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */
 
#include "BLI_assert.h"
 
#include "DNA_material_types.h"
 
#include "GPU_material.hh"
 
#include "COM_shader_node.hh"
 
#include "NOD_socket_search_link.hh"
 
#include "RNA_enum_types.hh"
 
#include "node_composite_util.hh"
 
/* **************** MIX RGB ******************** */
 
namespace blender::nodes::node_composite_mixrgb_cc {
 
static void cmp_node_mixrgb_declare(NodeDeclarationBuilder &b)
{
  b.add_input<decl::Float>("Fac")
      .default_value(1.0f)
      .min(0.0f)
      .max(1.0f)
      .subtype(PROP_FACTOR)
      .compositor_domain_priority(2);
  b.add_input<decl::Color>("Image")
      .default_value({1.0f, 1.0f, 1.0f, 1.0f})
      .compositor_domain_priority(0);
  b.add_input<decl::Color>("Image", "Image_001")
      .default_value({1.0f, 1.0f, 1.0f, 1.0f})
      .compositor_domain_priority(1);
  b.add_output<decl::Color>("Image");
}
 
class SocketSearchOp {
 public:
  std::string socket_name;
  int mode = MA_RAMP_BLEND;
  void operator()(LinkSearchOpParams &params)
  {
    bNode &node = params.add_node("CompositorNodeMixRGB");
    node.custom1 = mode;
    params.update_and_connect_available_socket(node, socket_name);
  }
};
 
static void node_gather_link_searches(GatherLinkSearchOpParams &params)
{
  const int weight = ELEM(params.other_socket().type, SOCK_RGBA) ? 0 : -1;
 
  for (const EnumPropertyItem *item = rna_enum_ramp_blend_items; item->identifier != nullptr;
       item++)
  {
    if (item->name != nullptr && item->identifier[0] != '\0') {
      params.add_item(IFACE_(item->name), SocketSearchOp{"Image", item->value}, weight);
    }
  }
}
 
using namespace blender::realtime_compositor;
 
class MixRGBShaderNode : public ShaderNode {
 public:
  using ShaderNode::ShaderNode;
 
  void compile(GPUMaterial *material) override
  {
    GPUNodeStack *inputs = get_inputs_array();
    GPUNodeStack *outputs = get_outputs_array();
 
    if (get_use_alpha()) {
      GPU_link(material,
               "multiply_by_alpha",
               get_input_link("Fac"),
               get_input_link("Image_001"),
               &get_input("Fac").link);
    }
 
    GPU_stack_link(material, &bnode(), get_shader_function_name(), inputs, outputs);
 
    if (!get_should_clamp()) {
      return;
    }
 
    const float min[4] = {0.0f, 0.0f, 0.0f, 0.0f};
    const float max[4] = {1.0f, 1.0f, 1.0f, 1.0f};
    GPU_link(material,
             "clamp_color",
             get_output("Image").link,
             GPU_constant(min),
             GPU_constant(max),
             &get_output("Image").link);
  }
 
  int get_mode()
  {
    return bnode().custom1;
  }
 
  const char *get_shader_function_name()
  {
    switch (get_mode()) {
      case MA_RAMP_BLEND:
        return "mix_blend";
      case MA_RAMP_ADD:
        return "mix_add";
      case MA_RAMP_MULT:
        return "mix_mult";
      case MA_RAMP_SUB:
        return "mix_sub";
      case MA_RAMP_SCREEN:
        return "mix_screen";
      case MA_RAMP_DIV:
        return "mix_div";
      case MA_RAMP_DIFF:
        return "mix_diff";
      case MA_RAMP_EXCLUSION:
        return "mix_exclusion";
      case MA_RAMP_DARK:
        return "mix_dark";
      case MA_RAMP_LIGHT:
        return "mix_light";
      case MA_RAMP_OVERLAY:
        return "mix_overlay";
      case MA_RAMP_DODGE:
        return "mix_dodge";
      case MA_RAMP_BURN:
        return "mix_burn";
      case MA_RAMP_HUE:
        return "mix_hue";
      case MA_RAMP_SAT:
        return "mix_sat";
      case MA_RAMP_VAL:
        return "mix_val";
      case MA_RAMP_COLOR:
        return "mix_color";
      case MA_RAMP_SOFT:
        return "mix_soft";
      case MA_RAMP_LINEAR:
        return "mix_linear";
    }
 
    BLI_assert_unreachable();
    return nullptr;
  }
 
  bool get_use_alpha()
  {
    return bnode().custom2 & SHD_MIXRGB_USE_ALPHA;
  }
 
  bool get_should_clamp()
  {
    return bnode().custom2 & SHD_MIXRGB_CLAMP;
  }
};
 
static ShaderNode *get_compositor_shader_node(DNode node)
{
  return new MixRGBShaderNode(node);
}
 
}  // namespace blender::nodes::node_composite_mixrgb_cc
 
void register_node_type_cmp_mix_rgb()
{
  namespace file_ns = blender::nodes::node_composite_mixrgb_cc;
 
  static blender::bke::bNodeType ntype;
 
  cmp_node_type_base(&ntype, CMP_NODE_MIX_RGB, "Mix", NODE_CLASS_OP_COLOR);
  ntype.flag |= NODE_PREVIEW;
  ntype.declare = file_ns::cmp_node_mixrgb_declare;
  ntype.labelfunc = node_blend_label;
  ntype.get_compositor_shader_node = file_ns::get_compositor_shader_node;
  ntype.gather_link_search_ops = file_ns::node_gather_link_searches;
 
  blender::bke::node_register_type(&ntype);
}