node_composite_val_to_rgb.cc

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/* SPDX-FileCopyrightText: 2006 Blender Authors
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */
 
#include "BLI_assert.h"
 
#include "IMB_colormanagement.hh"
 
#include "BKE_colorband.hh"
 
#include "GPU_material.hh"
 
#include "COM_shader_node.hh"
 
#include "node_composite_util.hh"
 
/* **************** VALTORGB ******************** */
 
namespace blender::nodes::node_composite_color_ramp_cc {
 
static void cmp_node_valtorgb_declare(NodeDeclarationBuilder &b)
{
  b.add_input<decl::Float>("Fac")
      .default_value(0.5f)
      .min(0.0f)
      .max(1.0f)
      .subtype(PROP_FACTOR)
      .compositor_domain_priority(1);
  b.add_output<decl::Color>("Image").compositor_domain_priority(0);
  b.add_output<decl::Float>("Alpha");
}
 
static void node_composit_init_valtorgb(bNodeTree * /*ntree*/, bNode *node)
{
  node->storage = BKE_colorband_add(true);
}
 
using namespace blender::realtime_compositor;
 
class ColorRampShaderNode : public ShaderNode {
 public:
  using ShaderNode::ShaderNode;
 
  void compile(GPUMaterial *material) override
  {
    GPUNodeStack *inputs = get_inputs_array();
    GPUNodeStack *outputs = get_outputs_array();
 
    ColorBand *color_band = get_color_band();
 
    /* Common / easy case optimization. */
    if ((color_band->tot <= 2) && (color_band->color_mode == COLBAND_BLEND_RGB)) {
      float mul_bias[2];
      switch (color_band->ipotype) {
        case COLBAND_INTERP_LINEAR:
          mul_bias[0] = 1.0f / (color_band->data[1].pos - color_band->data[0].pos);
          mul_bias[1] = -mul_bias[0] * color_band->data[0].pos;
          GPU_stack_link(material,
                         &bnode(),
                         "valtorgb_opti_linear",
                         inputs,
                         outputs,
                         GPU_uniform(mul_bias),
                         GPU_uniform(&color_band->data[0].r),
                         GPU_uniform(&color_band->data[1].r));
          return;
        case COLBAND_INTERP_CONSTANT:
          mul_bias[1] = max_ff(color_band->data[0].pos, color_band->data[1].pos);
          GPU_stack_link(material,
                         &bnode(),
                         "valtorgb_opti_constant",
                         inputs,
                         outputs,
                         GPU_uniform(&mul_bias[1]),
                         GPU_uniform(&color_band->data[0].r),
                         GPU_uniform(&color_band->data[1].r));
          return;
        case COLBAND_INTERP_EASE:
          mul_bias[0] = 1.0f / (color_band->data[1].pos - color_band->data[0].pos);
          mul_bias[1] = -mul_bias[0] * color_band->data[0].pos;
          GPU_stack_link(material,
                         &bnode(),
                         "valtorgb_opti_ease",
                         inputs,
                         outputs,
                         GPU_uniform(mul_bias),
                         GPU_uniform(&color_band->data[0].r),
                         GPU_uniform(&color_band->data[1].r));
          return;
        case COLBAND_INTERP_B_SPLINE:
        case COLBAND_INTERP_CARDINAL:
          /* Not optimized yet. Fallback to gradient texture. */
          break;
        default:
          BLI_assert_unreachable();
          return;
      }
    }
 
    float *array, layer;
    int size;
    BKE_colorband_evaluate_table_rgba(color_band, &array, &size);
    GPUNodeLink *tex = GPU_color_band(material, size, array, &layer);
 
    if (color_band->ipotype == COLBAND_INTERP_CONSTANT) {
      GPU_stack_link(
          material, &bnode(), "valtorgb_nearest", inputs, outputs, tex, GPU_constant(&layer));
      return;
    }
 
    GPU_stack_link(material, &bnode(), "valtorgb", inputs, outputs, tex, GPU_constant(&layer));
  }
 
  ColorBand *get_color_band()
  {
    return static_cast<ColorBand *>(bnode().storage);
  }
};
 
static ShaderNode *get_compositor_shader_node(DNode node)
{
  return new ColorRampShaderNode(node);
}
 
}  // namespace blender::nodes::node_composite_color_ramp_cc
 
void register_node_type_cmp_valtorgb()
{
  namespace file_ns = blender::nodes::node_composite_color_ramp_cc;
 
  static blender::bke::bNodeType ntype;
 
  cmp_node_type_base(&ntype, CMP_NODE_VALTORGB, "Color Ramp", NODE_CLASS_CONVERTER);
  ntype.declare = file_ns::cmp_node_valtorgb_declare;
  blender::bke::node_type_size(&ntype, 240, 200, 320);
  ntype.initfunc = file_ns::node_composit_init_valtorgb;
  blender::bke::node_type_storage(
      &ntype, "ColorBand", node_free_standard_storage, node_copy_standard_storage);
  ntype.get_compositor_shader_node = file_ns::get_compositor_shader_node;
 
  blender::bke::node_register_type(&ntype);
}
 
/* **************** RGBTOBW ******************** */
 
namespace blender::nodes::node_composite_rgb_to_bw_cc {
 
static void cmp_node_rgbtobw_declare(NodeDeclarationBuilder &b)
{
  b.add_input<decl::Color>("Image")
      .default_value({0.8f, 0.8f, 0.8f, 1.0f})
      .compositor_domain_priority(0);
  b.add_output<decl::Float>("Val");
}
 
using namespace blender::realtime_compositor;
 
class RGBToBWShaderNode : public ShaderNode {
 public:
  using ShaderNode::ShaderNode;
 
  void compile(GPUMaterial *material) override
  {
    GPUNodeStack *inputs = get_inputs_array();
    GPUNodeStack *outputs = get_outputs_array();
 
    float luminance_coefficients[3];
    IMB_colormanagement_get_luminance_coefficients(luminance_coefficients);
 
    GPU_stack_link(material,
                   &bnode(),
                   "color_to_luminance",
                   inputs,
                   outputs,
                   GPU_constant(luminance_coefficients));
  }
};
 
static ShaderNode *get_compositor_shader_node(DNode node)
{
  return new RGBToBWShaderNode(node);
}
 
}  // namespace blender::nodes::node_composite_rgb_to_bw_cc
 
void register_node_type_cmp_rgbtobw()
{
  namespace file_ns = blender::nodes::node_composite_rgb_to_bw_cc;
 
  static blender::bke::bNodeType ntype;
 
  cmp_node_type_base(&ntype, CMP_NODE_RGBTOBW, "RGB to BW", NODE_CLASS_CONVERTER);
  ntype.declare = file_ns::cmp_node_rgbtobw_declare;
  blender::bke::node_type_size_preset(&ntype, blender::bke::eNodeSizePreset::Default);
  ntype.get_compositor_shader_node = file_ns::get_compositor_shader_node;
 
  blender::bke::node_register_type(&ntype);
}