我将使用的一些网格并不总是具有 DiffuseMap 或 SpecularMap。当我尝试加载没有漫反射和镜面反射贴图的内容时,程序崩溃,因为 DiffuseMap.ImageView/SpecularMap.ImageView 中没有任何内容,因为它没有指向任何内容。如果我尝试将 imageview/sample 设置为 VK_NULL_HANDLE,程序会给出此信息并在 vkUpdateDescriptorSets 处崩溃:
Validation Layer: Invalid VkImageView Object 0x0. The Vulkan spec states: If descriptorType is VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE, VK_DESCRIPTOR_TYPE_STORAGE_IMAGE, or VK_DESCRIPTOR_TYPE_INPUT_ATTACHMENT, the imageView and imageLayout members of each element of pImageInfo must be a valid VkImageView and VkImageLayout, respectively (https://www.khronos.org/registry/vulkan/specs/1.1-extensions/html/vkspec.html#VUID-VkWriteDescriptorSet-descriptorType-00326)
然后,如果我尝试将绑定设置为 null,我会得到以下结果:
Validation Layer: vkUpdateDescriptorSets: required parameter pDescriptorWrites[2].dstSet specified as VK_NULL_HANDLE
验证层:无法对尚未分配的 VkDescriptorSet 0x0[] 调用 vkUpdateDescriptorSets()。
这就是基本代码现在的样子。这是定义描述符集的区域,以便更容易地查看正在发生的情况:
void Mesh::CreateDescriptorSets(VulkanRenderer& Renderer)
{
BaseMesh::CreateDescriptorSets(Renderer, *GetDescriptorSetLayout(Renderer));
VkDescriptorImageInfo DiffuseMap = {};
DiffuseMap.imageLayout = VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL;
DiffuseMap.imageView = TextureList[0].textureImageView;
DiffuseMap.sampler = TextureList[0].textureSampler;
VkDescriptorImageInfo SpecularMap = {};
SpecularMap.imageLayout = VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL;
SpecularMap.imageView = TextureList[1].textureImageView;
SpecularMap.sampler = TextureList[1].textureSampler;
for (size_t i = 0; i < GetSwapChainImageCount(Renderer); i++)
{
VkDescriptorBufferInfo PositionInfo = {};
PositionInfo.buffer = uniformBuffers[i];
PositionInfo.offset = 0;
PositionInfo.range = sizeof(UniformBufferObject);
VkDescriptorBufferInfo AmbiantLightInfo = {};
AmbiantLightInfo.buffer = AmbientLightUniformBuffers[i];
AmbiantLightInfo.offset = 0;
AmbiantLightInfo.range = sizeof(AmbientLightUniformBuffer);
VkDescriptorBufferInfo LightInfo = {};
LightInfo.buffer = LighterUniformBuffers[i];
LightInfo.offset = 0;
LightInfo.range = sizeof(Lighter);
std::array<WriteDescriptorSetInfo, 5> WriteDescriptorInfo = {};
WriteDescriptorInfo[0].DstBinding = 0;
WriteDescriptorInfo[0].DstSet = descriptorSets[i];
WriteDescriptorInfo[0].DescriptorType = VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER;
WriteDescriptorInfo[0].DescriptorBufferInfo = PositionInfo;
WriteDescriptorInfo[1].DstBinding = 1;
WriteDescriptorInfo[1].DstSet = descriptorSets[i];
WriteDescriptorInfo[1].DescriptorType = VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER;
WriteDescriptorInfo[1].DescriptorImageInfo = DiffuseMap;
WriteDescriptorInfo[2].DstBinding = 2;
WriteDescriptorInfo[2].DstSet = descriptorSets[i];
WriteDescriptorInfo[2].DescriptorType = VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER;
WriteDescriptorInfo[2].DescriptorImageInfo = SpecularMap;
WriteDescriptorInfo[3].DstBinding = 3;
WriteDescriptorInfo[3].DstSet = descriptorSets[i];
WriteDescriptorInfo[3].DescriptorType = VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER;
WriteDescriptorInfo[3].DescriptorBufferInfo = AmbiantLightInfo;
WriteDescriptorInfo[4].DstBinding = 4;
WriteDescriptorInfo[4].DstSet = descriptorSets[i];
WriteDescriptorInfo[4].DescriptorType = VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER;
WriteDescriptorInfo[4].DescriptorBufferInfo = LightInfo;
Mesh::CreateDescriptorSetsData(Renderer, std::vector<WriteDescriptorSetInfo>(WriteDescriptorInfo.begin(), WriteDescriptorInfo.end()));
}
}