Method prepare

framework/core/descriptor_set.cpp:58–147

}

void DescriptorSet::prepare()
{
	// We don't want to prepare twice during the life cycle of a Descriptor Set
	if (!write_descriptor_sets.empty())
	{
		LOGW("Trying to prepare a descriptor set that has already been prepared, skipping.");
		return;
	}

	// Iterate over all buffer bindings
	for (auto &binding_it : buffer_infos)
	{
		auto  binding_index   = binding_it.first;
		auto &buffer_bindings = binding_it.second;

		if (auto binding_info = descriptor_set_layout.get_layout_binding(binding_index))
		{
			// Iterate over all binding buffers in array
			for (auto &element_it : buffer_bindings)
			{
				auto &buffer_info = element_it.second;

				size_t uniform_buffer_range_limit = device.get_gpu().get_properties().limits.maxUniformBufferRange;
				size_t storage_buffer_range_limit = device.get_gpu().get_properties().limits.maxStorageBufferRange;

				size_t buffer_range_limit = static_cast<size_t>(buffer_info.range);

				if ((binding_info->descriptorType == VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER || binding_info->descriptorType == VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER_DYNAMIC) && buffer_range_limit > uniform_buffer_range_limit)
				{
					LOGE("Set {} binding {} cannot be updated: buffer size {} exceeds the uniform buffer range limit {}", descriptor_set_layout.get_index(), binding_index, buffer_info.range, uniform_buffer_range_limit);
					buffer_range_limit = uniform_buffer_range_limit;
				}
				else if ((binding_info->descriptorType == VK_DESCRIPTOR_TYPE_STORAGE_BUFFER || binding_info->descriptorType == VK_DESCRIPTOR_TYPE_STORAGE_BUFFER_DYNAMIC) && buffer_range_limit > storage_buffer_range_limit)
				{
					LOGE("Set {} binding {} cannot be updated: buffer size {} exceeds the storage buffer range limit {}", descriptor_set_layout.get_index(), binding_index, buffer_info.range, storage_buffer_range_limit);
					buffer_range_limit = storage_buffer_range_limit;
				}

				// Clip the buffers range to the limit if one exists as otherwise we will receive a Vulkan validation error
				buffer_info.range = buffer_range_limit;

				VkWriteDescriptorSet write_descriptor_set{VK_STRUCTURE_TYPE_WRITE_DESCRIPTOR_SET};

				write_descriptor_set.dstBinding      = binding_index;
				write_descriptor_set.descriptorType  = binding_info->descriptorType;
				write_descriptor_set.pBufferInfo     = &buffer_info;
				write_descriptor_set.dstSet          = handle;
				write_descriptor_set.dstArrayElement = element_it.first;
				write_descriptor_set.descriptorCount = 1;

				write_descriptor_sets.push_back(write_descriptor_set);
			}
		}
		else
		{
			LOGE("Shader layout set does not use buffer binding at #{}", binding_index);
		}
	}