separate_sampler.hpp

#ifndef LIBSBX_GRAPHICS_IMAGES_SEPARATE_SAMPLER_HPP_
#define LIBSBX_GRAPHICS_IMAGES_SEPARATE_SAMPLER_HPP_
 
#include <libsbx/graphics/graphics_module.hpp>
 
#include <libsbx/graphics/descriptor/descriptor.hpp>
 
#include <libsbx/graphics/images/image.hpp>
 
namespace sbx::graphics {
 
class separate_sampler : public descriptor {
 
public:
 
  separate_sampler(VkFilter filter = VK_FILTER_LINEAR, VkSamplerAddressMode address_mode = VK_SAMPLER_ADDRESS_MODE_REPEAT) {
    image::create_image_sampler(_handle, filter, address_mode, false, 1u);
  }
 
  ~separate_sampler() {
    auto& graphics_module = core::engine::get_module<graphics::graphics_module>();
    auto& logical_device = graphics_module.logical_device();
 
    vkDestroySampler(logical_device, _handle, nullptr);
  }
 
  static auto create_descriptor_set_layout_binding(std::uint32_t binding, VkDescriptorType descriptor_type, VkShaderStageFlags shader_stage_flags) noexcept -> VkDescriptorSetLayoutBinding {
    auto descriptor_set_layout_binding = VkDescriptorSetLayoutBinding{};
    descriptor_set_layout_binding.binding = binding;
    descriptor_set_layout_binding.descriptorType = descriptor_type;
    descriptor_set_layout_binding.stageFlags = shader_stage_flags;
    descriptor_set_layout_binding.descriptorCount = 1u;
    descriptor_set_layout_binding.pImmutableSamplers = nullptr;
 
    return descriptor_set_layout_binding;
  }
 
  auto write_descriptor_set(std::uint32_t binding, VkDescriptorType descriptor_type) const noexcept -> graphics::write_descriptor_set override {
    auto descriptor_image_infos = std::vector<VkDescriptorImageInfo>{};
 
    auto descriptor_image_info = VkDescriptorImageInfo{};
    descriptor_image_info.imageLayout = VK_IMAGE_LAYOUT_UNDEFINED;
    descriptor_image_info.imageView = nullptr;
    descriptor_image_info.sampler = _handle;
 
    descriptor_image_infos.push_back(descriptor_image_info);
 
    auto descriptor_write = VkWriteDescriptorSet{};
    descriptor_write.sType = VK_STRUCTURE_TYPE_WRITE_DESCRIPTOR_SET;
    descriptor_write.dstSet = nullptr;
    descriptor_write.dstBinding = binding;
    descriptor_write.dstArrayElement = 0;
    descriptor_write.descriptorCount = 1;
    descriptor_write.descriptorType = descriptor_type;
 
    return graphics::write_descriptor_set{descriptor_write, descriptor_image_infos};
  }
 
  auto handle() const noexcept -> VkSampler {
    return _handle;
  }
 
  operator VkSampler() const noexcept {
    return _handle;
  }
 
private:
 
  VkSampler _handle;
 
}; // class separate_sampler
 
} // namespace sbx::graphics
 
#endif // LIBSBX_GRAPHICS_IMAGES_SEPARATE_SAMPLER_HPP_