initial commit-moved from vulkan_guide

src/core/vk_descriptors.h

@@ -0,0 +1,79 @@
+#pragma once
+
+#include <core/vk_types.h>
+
+
+struct DescriptorLayoutBuilder
+{
+    std::vector<VkDescriptorSetLayoutBinding> bindings;
+
+    void add_binding(uint32_t binding, VkDescriptorType type);
+
+    void clear();
+
+    VkDescriptorSetLayout build(VkDevice device, VkShaderStageFlags shaderStages, void *pNext = nullptr,
+                                VkDescriptorSetLayoutCreateFlags flags = 0);
+};
+
+struct DescriptorWriter
+{
+    std::deque<VkDescriptorImageInfo> imageInfos;
+    std::deque<VkDescriptorBufferInfo> bufferInfos;
+    std::vector<VkWriteDescriptorSet> writes;
+
+    void write_image(int binding, VkImageView image, VkSampler sampler, VkImageLayout layout, VkDescriptorType type);
+
+    void write_buffer(int binding, VkBuffer buffer, size_t size, size_t offset, VkDescriptorType type);
+
+    void clear();
+
+    void update_set(VkDevice device, VkDescriptorSet set);
+};
+
+
+struct DescriptorAllocator
+{
+    struct PoolSizeRatio
+    {
+        VkDescriptorType type;
+        float ratio;
+    };
+
+    VkDescriptorPool pool;
+
+    void init_pool(VkDevice device, uint32_t maxSets, std::span<PoolSizeRatio> poolRatios);
+
+    void clear_descriptors(VkDevice device);
+
+    void destroy_pool(VkDevice device);
+
+    VkDescriptorSet allocate(VkDevice device, VkDescriptorSetLayout layout);
+};
+
+struct DescriptorAllocatorGrowable
+{
+public:
+    struct PoolSizeRatio
+    {
+        VkDescriptorType type;
+        float ratio;
+    };
+
+    void init(VkDevice device, uint32_t initialSets, std::span<PoolSizeRatio> poolRatios);
+
+    void clear_pools(VkDevice device);
+
+    void destroy_pools(VkDevice device);
+
+    VkDescriptorSet allocate(VkDevice device, VkDescriptorSetLayout layout, void *pNext = nullptr);
+
+private:
+    VkDescriptorPool get_pool(VkDevice device);
+
+    VkDescriptorPool create_pool(VkDevice device, uint32_t setCount, std::span<PoolSizeRatio> poolRatios);
+
+    std::vector<PoolSizeRatio> ratios;
+    std::vector<VkDescriptorPool> fullPools;
+    std::vector<VkDescriptorPool> readyPools;
+    uint32_t setsPerPool;
+};