[FIXED] counting of duplicate entries in _availableDescriptorPoolSizes

[siystar]

Pull Request Template

Description

Fixed underflow in _availableDescriptorPoolSizes when VkDescriptorPoolSizes contain duplicate entries.

Type of change

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

info: DescriptorPool::allocateDescriptorSet(..) allocated ref_ptr<vsg::DescriptorSet::Implementation>(...)
info: _availableDescriptorPoolSizes [DescriptorType = Count]
info: 0 = 2
info: 1 = 4294967288
info: 2 = 2
info: 6 = 4
info: 7 = 3
info: 0 = 2
info: 1 = 4294967288
info: 2 = 2
info: 6 = 4
info: 7 = 3
Validation Error: [ VUID-VkDescriptorSetAllocateInfo-apiVersion-07896 ] (...) | vkAllocateDescriptorSets(): Unable to allocate 3 descriptors of type VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER from VkDescriptorPool (...). This pool only has 0 descriptors of this type remaining.

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[siystar]

The Vulkan spec 14.2.3. states: "If multiple VkDescriptorPoolSize structures containing the same descriptor type appear in the pPoolSizes array then the pool will be created with enough storage for the total number of descriptors of each type."