texture_manager.hpp

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// texture_manager.hpp
/*
  neogfx C++ App/Game Engine
  Copyright (c) 2015, 2020 Leigh Johnston.  All Rights Reserved.
  
  This program is free software: you can redistribute it and / or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation, either version 3 of the License, or
  (at your option) any later version.
  
  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.
  
  You should have received a copy of the GNU General Public License
  along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/
 
#pragma once
 
#include <neogfx/neogfx.hpp>
#include <variant>
#include <neolib/core/jar.hpp>
#include <neogfx/gfx/i_image.hpp>
#include <neogfx/gfx/i_texture_manager.hpp>
 
namespace neogfx
{
    class texture_manager : public i_texture_manager
    {
        friend class texture_wrapper;
    protected:
        typedef ref_ptr<i_texture> texture_pointer;
        typedef neolib::pair<texture_pointer, uint32_t> texture_list_entry;
        typedef neolib::jar<texture_list_entry> texture_list;
    private:
        friend neolib::cookie item_cookie(texture_list_entry const&);
    protected:
        texture_id allocate_texture_id() override;
    public:
        void find_texture(texture_id aId, i_ref_ptr<i_texture>& aResult) const override;
        void clear_textures() override;
    public:
        void add_ref(texture_id aId) override;
        void release(texture_id aId) override;
        long use_count(texture_id aId) const override;
    public:
        std::unique_ptr<i_texture_atlas> create_texture_atlas(size const& aSize = size{ 1024.0, 1024.0 }) override;
    private:
        void add_sub_texture(i_sub_texture& aSubTexture) override;
        void remove_sub_texture(i_sub_texture& aSubTexture) override;
    protected:
        const texture_list& textures() const;
        texture_list& textures();
        texture_list::const_iterator find_texture(i_image const& aImage, rect const& aImagePart) const;
        texture_list::iterator find_texture(i_image const& aImage, rect const& aImagePart);
        ref_ptr<i_texture> add_texture(i_ref_ptr<i_native_texture> const& aTexture);
    private:
        void cleanup();
    private:
        texture_list iTextures;
        std::vector<std::unique_ptr<i_texture_atlas>> iTextureAtlases;
    };
}