update_descriptor_buffers()

void MayaFlux::Portal::Graphics::ShaderFoundry::update_descriptor_buffers

(

std::span< const DescriptorBufferWrite >

writes

)

Update several buffer descriptor slots in one Vulkan call.

Equivalent to calling update_descriptor_buffer once per entry, except every entry is submitted through a single vkUpdateDescriptorSets call instead of one call per entry. Entries may target different descriptor sets; order among them does not matter since each names a distinct (descriptor set, binding). An entry naming an unknown descriptor_set_id is skipped, matching update_descriptor_buffer's behaviour for the same case. A call with an empty span does nothing.

Parameters

writes

Slots to update.

Definition at line 784 of file ShaderFoundry.cpp.

{
    if (writes.empty()) {
        return;
    }
 
    std::vector<vk::DescriptorBufferInfo> buffer_infos;
    buffer_infos.reserve(writes.size());
    std::vector<vk::WriteDescriptorSet> descriptor_writes;
    descriptor_writes.reserve(writes.size());
 
    for (const auto& w : writes) {
        auto it = m_descriptor_sets.find(w.descriptor_set_id);
        if (it == m_descriptor_sets.end()) {
            continue;
        }
 
        buffer_infos.emplace_back(w.buffer, w.offset, w.size);
 
        vk::WriteDescriptorSet write;
        write.dstSet = it->second.descriptor_set;
        write.dstBinding = w.binding;
        write.dstArrayElement = 0;
        write.descriptorCount = 1;
        write.descriptorType = w.type;
        write.pBufferInfo = &buffer_infos.back();
        descriptor_writes.push_back(write);
    }
 
    if (!descriptor_writes.empty()) {
        get_device().updateDescriptorSets(
            static_cast<uint32_t>(descriptor_writes.size()), descriptor_writes.data(), 0, nullptr);
    }
}

References get_device(), and m_descriptor_sets.

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