Method setupDescriptorSets

examples/vulkan/Vulkan.cpp:2159–2222

Set up our descriptor sets

    // Set up our descriptor sets
    void setupDescriptorSets()
    {
        // Allocate a descriptor set for each frame in flight
        std::vector<VkDescriptorSetLayout> descriptorSetLayouts(swapchainImages.size(), descriptorSetLayout);

        VkDescriptorSetAllocateInfo descriptorSetAllocateInfo = VkDescriptorSetAllocateInfo();
        descriptorSetAllocateInfo.sType                       = VK_STRUCTURE_TYPE_DESCRIPTOR_SET_ALLOCATE_INFO;
        descriptorSetAllocateInfo.descriptorPool              = descriptorPool;
        descriptorSetAllocateInfo.descriptorSetCount          = static_cast<std::uint32_t>(swapchainImages.size());
        descriptorSetAllocateInfo.pSetLayouts                 = descriptorSetLayouts.data();

        descriptorSets.resize(swapchainImages.size());

        if (vkAllocateDescriptorSets(device, &descriptorSetAllocateInfo, descriptorSets.data()) != VK_SUCCESS)
        {
            descriptorSets.clear();

            vulkanAvailable = false;
            return;
        }

        // For every descriptor set, set up the bindings to our uniform buffer and texture sampler
        for (std::size_t i = 0; i < descriptorSets.size(); ++i)
        {
            std::array<VkWriteDescriptorSet, 2> writeDescriptorSets{};

            // Uniform buffer binding information
            VkDescriptorBufferInfo descriptorBufferInfo = VkDescriptorBufferInfo();
            descriptorBufferInfo.buffer                 = uniformBuffers[i];
            descriptorBufferInfo.offset                 = 0;
            descriptorBufferInfo.range                  = sizeof(Matrix) * 3;

            writeDescriptorSets[0]                 = VkWriteDescriptorSet();
            writeDescriptorSets[0].sType           = VK_STRUCTURE_TYPE_WRITE_DESCRIPTOR_SET;
            writeDescriptorSets[0].dstSet          = descriptorSets[i];
            writeDescriptorSets[0].dstBinding      = 0;
            writeDescriptorSets[0].dstArrayElement = 0;
            writeDescriptorSets[0].descriptorType  = VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER;
            writeDescriptorSets[0].descriptorCount = 1;
            writeDescriptorSets[0].pBufferInfo     = &descriptorBufferInfo;

            // Texture sampler binding information
            VkDescriptorImageInfo descriptorImageInfo = VkDescriptorImageInfo();
            descriptorImageInfo.imageLayout           = VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL;
            descriptorImageInfo.imageView             = textureImageView;
            descriptorImageInfo.sampler               = textureSampler;

            writeDescriptorSets[1]                 = VkWriteDescriptorSet();
            writeDescriptorSets[1].sType           = VK_STRUCTURE_TYPE_WRITE_DESCRIPTOR_SET;
            writeDescriptorSets[1].dstSet          = descriptorSets[i];
            writeDescriptorSets[1].dstBinding      = 1;
            writeDescriptorSets[1].dstArrayElement = 0;
            writeDescriptorSets[1].descriptorType  = VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER;
            writeDescriptorSets[1].descriptorCount = 1;
            writeDescriptorSets[1].pImageInfo      = &descriptorImageInfo;

            // Update the descriptor set
            vkUpdateDescriptorSets(device,