pipeline_SDF_specialization_constants.hpp

// Copyright Take Vos 2020.
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at https://www.boost.org/LICENSE_1_0.txt)
 
#pragma once
 
#include "../rapid/sfloat_rg32.hpp"
#include <vulkan/vulkan.hpp>
 
namespace tt::pipeline_SDF {
 
struct specialization_constants {
    float sdf_r8maxDistance;
    float atlasImageWidth;
 
    [[nodiscard]] vk::SpecializationInfo specializationInfo(std::vector<vk::SpecializationMapEntry> &entries) const noexcept {
        return {
            narrow_cast<uint32_t>(std::ssize(entries)), entries.data(),
            sizeof (specialization_constants),
            this
        };
    }
 
    [[nodiscard]] static std::vector<vk::SpecializationMapEntry> specializationConstantMapEntries() noexcept {
        return {
            {0, offsetof(specialization_constants, sdf_r8maxDistance), sizeof(sdf_r8maxDistance)},
            {1, offsetof(specialization_constants, atlasImageWidth), sizeof(atlasImageWidth)},
        };
    }
};
 
}