ResourcePool.h

/*
 * AUI Framework - Declarative UI toolkit for modern C++20
 * Copyright (C) 2020-2025 Alex2772 and Contributors
 *
 * SPDX-License-Identifier: MPL-2.0
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 */
 
#pragma once
 
#include <AUI/GL/gl.h>
#include "AUI/Common/AQueue.h"
 
namespace gl {
 
   enum class ResourceKind {
       VERTEX_BUFFER,
       INDEX_BUFFER,
       TEXTURE,
   };
 
   namespace impl {
       template<ResourceKind T>
       struct resource;
 
       struct resource_basic_buffer {
           static GLuint gen() noexcept {
               GLuint b = 0;
               glGenBuffers(1, &b);
               return b;
           }
           static void del(GLuint b) noexcept {
               glDeleteBuffers(1, &b);
           }
       };
 
       template<> struct resource<ResourceKind::VERTEX_BUFFER>: resource_basic_buffer {};
       template<> struct resource<ResourceKind::INDEX_BUFFER>: resource_basic_buffer {};
 
       template<> struct resource<ResourceKind::TEXTURE> {
           static GLuint gen() noexcept {
               GLuint b = 0;
               glGenTextures(1, &b);
               return b;
           }
           static void del(GLuint b) noexcept {
               glDeleteTextures(1, &b);
           }
       };
   }
 
   template<ResourceKind T>
   class ResourcePool {
   public:
       static GLuint get() {
           return inst().mObjects.popOrGenerate([] {
               return gl::impl::resource<T>::gen();
           });
       }
       static void put(GLuint obj) {
           inst().mObjects.push(obj);
       }
 
       ~ResourcePool() {
           while (!mObjects.empty()) {
               gl::impl::resource<T>::del(mObjects.front());
               mObjects.pop();
           }
       }
 
   private:
       AQueue<GLuint> mObjects;
 
       static ResourcePool& inst() noexcept {
           static ResourcePool r;
           return r;
       }
   };
}

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