Method GetSizeInfo

tests/framework/ray_tracing_objects.cpp:1018–1062

}

VkAccelerationStructureBuildSizesInfoKHR BuildGeometryInfoKHR::GetSizeInfo(bool use_ppGeometries /*= true*/) {
    // Computer total primitives count, and get pointers to geometries
    std::vector<uint32_t> primitives_count(geometries_.size());
    std::vector<const VkAccelerationStructureGeometryKHR*> pGeometries;
    std::vector<VkAccelerationStructureGeometryKHR> geometries;

    if (use_ppGeometries) {
        pGeometries.reserve(geometries_.size());
    } else {
        geometries.reserve(geometries_.size());
    }

    for (const auto& [geometry_i, geometry] : vvl::enumerate(geometries_)) {
        primitives_count[geometry_i] = geometry.GetFullBuildRange().primitiveCount;
        if (use_ppGeometries) {
            pGeometries.emplace_back(&geometry.GetVkObj());
        } else {
            geometries.emplace_back(geometry.GetVkObj());
        }
    }
    vk_info_.geometryCount = static_cast<uint32_t>(geometries_.size());
    if (use_null_geometries_) {
        vk_info_.pGeometries = nullptr;
        vk_info_.ppGeometries = nullptr;
    } else if (use_ppGeometries) {
        vk_info_.ppGeometries = pGeometries.data();
    } else {
        vk_info_.pGeometries = geometries.data();
    }

    // Get VkAccelerationStructureBuildSizesInfoKHR using this->vk_info_
    VkAccelerationStructureBuildSizesInfoKHR size_info = vku::InitStructHelper();
    if (vk_info_.type == VK_ACCELERATION_STRUCTURE_TYPE_OPACITY_MICROMAP_KHR) {
        vk::GetAccelerationStructureBuildSizesKHR(device_->handle(), build_type_, &vk_info_, nullptr, &size_info);
    } else {
        vk::GetAccelerationStructureBuildSizesKHR(device_->handle(), build_type_, &vk_info_, primitives_count.data(), &size_info);
    }

    // pGeometries and geometries are going to be destroyed
    vk_info_.geometryCount = 0;
    vk_info_.ppGeometries = nullptr;
    vk_info_.pGeometries = nullptr;

    return size_info;
}

std::vector<VkAccelerationStructureBuildRangeInfoKHR> BuildGeometryInfoKHR::GetBuildRangeInfosFromGeometries() {
    std::vector<VkAccelerationStructureBuildRangeInfoKHR> range_infos(geometries_.size());