asset.h

/*
    Lightmetrica : A research-oriented renderer

    Copyright (c) 2014 Hisanari Otsu

    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
#ifndef LIB_LIGHTMETRICA_ASSET_H
#define LIB_LIGHTMETRICA_ASSET_H

#include "component.h"

LM_NAMESPACE_BEGIN

class Assets;
class ConfigNode;

class Asset : public Component
{
public:

    Asset() {}
    virtual ~Asset() {}

private:

    LM_DISABLE_COPY_AND_MOVE(Asset);

public:

    virtual bool Load(const ConfigNode& node, const Assets& assets) = 0;

    LM_PUBLIC_API std::string ID() const;

public:

    LM_HIDDEN_API void SetID(const std::string& id);

private:

    std::string id;

};

LM_NAMESPACE_END

#define LM_ASSET_INTERFACE_DEF(Name, GroupName)     \
    LM_COMPONENT_INTERFACE_DEF(Name);               \
    static const char* InterfaceGroupName() { return GroupName; }

#define LM_ASSET_DEPENDENCIES(...)                              \
    static const char** GetAssetDependencies(size_t& n)         \
    {                                                           \
        static const char* deps[] = { __VA_ARGS__ };            \
        n = sizeof(deps) / sizeof(deps[0]);                     \
        return deps;                                            \
    }

#define LM_ASSET_NO_DEPENDENCIES()                              \
    static const char** GetAssetDependencies(size_t& n)         \
    {                                                           \
        n = 0;                                                  \
        return nullptr;                                         \
    }

LM_NAMESPACE_BEGIN
LM_COMPONENT_CREATE_HAS_MEMBER_FUNCTION(GetAssetDependencies, const char** (*)(size_t&));
LM_COMPONENT_CREATE_HAS_MEMBER_FUNCTION(InterfaceGroupName, const char* (*)());
LM_NAMESPACE_END

#define LM_ASSET_CHECK_IS_VALID_INTERFACE(AssetInterfaceType)                           \
    LM_COMPONENT_CHECK_IS_DERIVED_CLASS(AssetInterfaceType, Asset);                     \
    LM_COMPONENT_CHECK_HAS_MEMBER_FUNCTION(AssetInterfaceType, GetAssetDependencies);   \
    LM_COMPONENT_CHECK_HAS_MEMBER_FUNCTION(AssetInterfaceType, InterfaceGroupName);

#endif // LIB_LIGHTMETRICA_ASSET_H