node_composite_pixelate.cc

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/* SPDX-FileCopyrightText: 2006 Blender Authors
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */
 
#include "GPU_shader.hh"
 
#include "COM_node_operation.hh"
#include "COM_utilities.hh"
 
#include "UI_interface.hh"
#include "UI_resources.hh"
 
#include "node_composite_util.hh"
 
/* **************** Pixelate ******************** */
 
namespace blender::nodes::node_composite_pixelate_cc {
 
static void cmp_node_pixelate_declare(NodeDeclarationBuilder &b)
{
  b.add_input<decl::Color>("Color").compositor_domain_priority(0);
  b.add_output<decl::Color>("Color");
}
 
static void node_composit_init_pixelate(bNodeTree * /*ntree*/, bNode *node)
{
  node->custom1 = 1;
}
 
static void node_composit_buts_pixelate(uiLayout *layout, bContext * /*C*/, PointerRNA *ptr)
{
  uiItemR(layout, ptr, "pixel_size", UI_ITEM_R_SPLIT_EMPTY_NAME, nullptr, ICON_NONE);
}
 
using namespace blender::realtime_compositor;
 
class PixelateOperation : public NodeOperation {
 public:
  using NodeOperation::NodeOperation;
 
  void execute() override
  {
    Result &input_image = get_input("Color");
    Result &output_image = get_result("Color");
    const int pixel_size = get_pixel_size();
    if (input_image.is_single_value() || pixel_size == 1) {
      input_image.pass_through(output_image);
      return;
    }
 
    GPUShader *shader = context().get_shader("compositor_pixelate");
    GPU_shader_bind(shader);
 
    GPU_shader_uniform_1i(shader, "pixel_size", pixel_size);
 
    input_image.bind_as_texture(shader, "input_tx");
 
    const Domain domain = compute_domain();
    output_image.allocate_texture(domain);
    output_image.bind_as_image(shader, "output_img");
 
    compute_dispatch_threads_at_least(shader, domain.size);
 
    GPU_shader_unbind();
    output_image.unbind_as_image();
    input_image.unbind_as_texture();
  }
 
  float get_pixel_size()
  {
    return bnode().custom1;
  }
};
 
static NodeOperation *get_compositor_operation(Context &context, DNode node)
{
  return new PixelateOperation(context, node);
}
 
}  // namespace blender::nodes::node_composite_pixelate_cc
 
void register_node_type_cmp_pixelate()
{
  namespace file_ns = blender::nodes::node_composite_pixelate_cc;
 
  static blender::bke::bNodeType ntype;
 
  cmp_node_type_base(&ntype, CMP_NODE_PIXELATE, "Pixelate", NODE_CLASS_OP_FILTER);
  ntype.declare = file_ns::cmp_node_pixelate_declare;
  ntype.draw_buttons = file_ns::node_composit_buts_pixelate;
  ntype.initfunc = file_ns::node_composit_init_pixelate;
  ntype.get_compositor_operation = file_ns::get_compositor_operation;
 
  blender::bke::node_register_type(&ntype);
}