vulkan 绑定在着色器中必须是顺序的吗

Question

在 vulkan 中，制服、变量或属性的绑定是否必须按顺序进行？假设我们有

layout (std140, set = 0, binding = 0) uniform ubo1 {}
layout (std140, set = 0, binding = 3) uniform ubo2 {}

允许吗？属性绑定也一样。?

Answer 1

是的，这在着色器代码中是允许的。不太确定实现。

您可以查看 VkDescriptorSetLayoutCreateInfo 的文档，了解定义描述符集布局所涉及的内容。您会注意到 VkDescriptorSetLayoutBinding 允许在任意索引处指定绑定。

作为个人偏好的问题（并且我没有找到关于此事的任何明确措辞），我根本不相信实现可以直观地处理这个问题。因此，我创建了 "fill in the gaps".

的空绑定

Answer 2

不，它们不一定要塞得严严实实。在 Descriptor Layout 描述 (13.2.1) 中，规范说：

Bindings that are not specified have a descriptorCount and stageFlags of zero, and the descriptorType is treated as undefined. However, all binding numbers between 0 and the maximum binding number in the VkDescriptorSetLayoutCreateInfo::pBindings array may consume memory in the descriptor set layout even if not all descriptor bindings are used, though it should not consume additional memory from the descriptor pool.

Note: The maximum binding number specified should be as compact as possible to avoid wasted memory.

vulkan 绑定在着色器中必须是顺序的吗

does vulkan bindings have to be sequential in shaders

glsl

vulkan