private void PrepareDescriptor(VkDevice device)
{
// 今は定数バッファを１つ、サンプラーを１つを格納できるだけのディスクリプタプールを準備.
VkDescriptorPoolSize descriptorPoolSize = new VkDescriptorPoolSize()
{
descriptorCount = 1,
type = VkDescriptorType.VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER,
};
VkDescriptorPoolSize descriptorPoolSizeForSampler = new VkDescriptorPoolSize()
{
descriptorCount = 1,
type = VkDescriptorType.VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER,
};
var descriptorPoolCreateInfo = new VkDescriptorPoolCreateInfo()
{
poolSizes = new[] { descriptorPoolSize, descriptorPoolSizeForSampler },
maxSets = 1,
flags = VkDescriptorPoolCreateFlags.VK_DESCRIPTOR_POOL_CREATE_FREE_DESCRIPTOR_SET_BIT,
};
VulkanAPI.vkCreateDescriptorPool(device, ref descriptorPoolCreateInfo, out m_descriptorPool);
// ディスクリプタセットレイアウトの作成.
// - 定数バッファを１つ
// - テクスチャサンプラ１つ
var descLayoutBindingForUniform = new VkDescriptorSetLayoutBinding();
descLayoutBindingForUniform.binding = 0;
descLayoutBindingForUniform.descriptorCount = 1;
descLayoutBindingForUniform.descriptorType = VkDescriptorType.VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER;
descLayoutBindingForUniform.stageFlags = VkShaderStageFlagBits.VK_SHADER_STAGE_VERTEX_BIT;
var descLayoutBindingForSampler = new VkDescriptorSetLayoutBinding();
descLayoutBindingForSampler.binding = 1;
descLayoutBindingForSampler.descriptorCount = 1;
descLayoutBindingForSampler.descriptorType = VkDescriptorType.VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER;
descLayoutBindingForSampler.stageFlags = VkShaderStageFlagBits.VK_SHADER_STAGE_FRAGMENT_BIT;
var descriptorSetLayoutCreateInfo = new VkDescriptorSetLayoutCreateInfo();
descriptorSetLayoutCreateInfo.bindings = new[] {
descLayoutBindingForUniform,
descLayoutBindingForSampler
};
VulkanAPI.vkCreateDescriptorSetLayout(device, ref descriptorSetLayoutCreateInfo, out m_descriptorSetLayout);
// ディスクリプタを作成＆更新.
VkDescriptorSet[] descriptorSets;
var descriptorSetAllocateInfo = new VkDescriptorSetAllocateInfo(m_descriptorPool, new[] { m_descriptorSetLayout });
VulkanAPI.vkAllocateDescriptorSets(device, ref descriptorSetAllocateInfo, out descriptorSets);
m_descriptorSet = descriptorSets[0];
var descUniform = new VkDescriptorBufferInfo()
{
buffer = m_uniformBuffer,
range = Marshal.SizeOf <Transform>(),
};
var descSampler = new VkDescriptorImageInfo()
{
imageView = m_imageView,
sampler = m_imageSampler,
};
var descForUniform = SampleHelpers.CreateDescriptorFromUniformBuffer(0, descUniform, m_descriptorSet);
var descForSampler = SampleHelpers.CreateDescriptorFromImageSampler(1, descSampler, m_descriptorSet);
var descriptorWrites = new[] { descForUniform, descForSampler };
VulkanAPI.vkUpdateDescriptorSets(device, descriptorWrites, null);
}