downsample_filter.hpp

// SPDX-License-Identifier: MIT
#ifndef LIBSBX_POST_FILTERS_DOWNSAMPLE_FILTER_HPP_
#define LIBSBX_POST_FILTERS_DOWNSAMPLE_FILTER_HPP_
 
#include <libsbx/core/engine.hpp>
 
#include <libsbx/post/filter.hpp>
 
namespace sbx::post {
 
class downsample_filter final : public filter {
 
  using base = filter;
 
public:
 
  downsample_filter(const std::vector<graphics::attachment_description>& attachments, const std::filesystem::path& path, const std::string& source_attachment)
  : base{attachments, path, base::default_pipeline_definition},
    _source_attachment{source_attachment} { }
 
  ~downsample_filter() override = default;
 
  auto render(graphics::command_buffer& command_buffer) -> void override {
    EASY_BLOCK("downsample_filter::render");
 
    auto& pipeline = base::pipeline();
    auto& descriptor_handler = base::descriptor_handler();
 
    auto& graphics_module = core::engine::get_module<graphics::graphics_module>();
 
    pipeline.bind(command_buffer);
 
    descriptor_handler.push("source_image", graphics_module.attachment(_source_attachment));
 
    if (!descriptor_handler.update(pipeline)) {
      return;
    }
 
    descriptor_handler.bind_descriptors(command_buffer);
 
    command_buffer.draw(3, 1, 0, 0);
  }
 
private:
 
  std::string _source_attachment;
 
}; // class downsample_filter
 
} // namespace sbx::post
 
#endif // LIBSBX_POST_FILTERS_DOWNSAMPLE_FILTER_HPP_