C_descriptorPool.hpp

/*
 * Copyright 2025 Guillaume Guillet
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
 
#ifndef _FGE_VULKAN_C_DESCRIPTORPOOL_HPP_INCLUDED
#define _FGE_VULKAN_C_DESCRIPTORPOOL_HPP_INCLUDED
 
#include "FastEngine/fge_extern.hpp"
#include "volk.h"
#include "FastEngine/vulkan/C_contextAware.hpp"
#include <optional>
#include <vector>
 
namespace fge::vulkan
{
 
class DescriptorSet;

class FGE_API DescriptorPool : public ContextAware
{
public:
    explicit DescriptorPool(Context const& context);
    DescriptorPool(DescriptorPool const& r) = delete;
    DescriptorPool(DescriptorPool&& r) noexcept;
    ~DescriptorPool() override;
 
    DescriptorPool& operator=(DescriptorPool const& r) = delete;
    DescriptorPool& operator=(DescriptorPool&& r) noexcept = delete;

    void create(std::vector<VkDescriptorPoolSize>&& descriptorPoolSizes,
                uint32_t maxSetsPerPool,
                bool isUnique,
                bool individuallyFree);
    void destroy() final;

    [[nodiscard]] std::optional<DescriptorSet> allocateDescriptorSet(VkDescriptorSetLayout layout,
                                                                     uint32_t variableElements = 0) const;

    void freeDescriptorSet(VkDescriptorSet descriptorSet, VkDescriptorPool descriptorPool) const;
    void resetPools() const;
 
    [[nodiscard]] uint32_t getMaxSetsPerPool() const;
    [[nodiscard]] bool isUnique() const;
    [[nodiscard]] bool isCreated() const;
 
private:
    struct Pool
    {
        VkDescriptorPool _pool;
        uint32_t _count;
    };
 
    [[nodiscard]] Pool createPool() const;
 
    std::vector<VkDescriptorPoolSize> g_descriptorPoolSizes;
 
    uint32_t g_maxSetsPerPool;
    mutable std::vector<Pool> g_descriptorPools;
    bool g_isUnique;
    bool g_isCreated;
    bool g_individuallyFree;
};
 
} // namespace fge::vulkan
 
#endif //_FGE_VULKAN_C_DESCRIPTORPOOL_HPP_INCLUDED