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/**
 * @file llenvmanager.h
 * @brief Declaration of classes managing WindLight and water settings.
 *
 * $LicenseInfo:firstyear=2009&license=viewerlgpl$
 * Second Life Viewer Source Code
 * Copyright (C) 2011, Linden Research, Inc.
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation;
 * version 2.1 of the License only.
 * 
 * This library 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
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 * 
 * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
 * $/LicenseInfo$
 */

#ifndef LL_ENVIRONMENT_H
#define LL_ENVIRONMENT_H

#include "llmemory.h"
#include "llsd.h"

#include "llsettingsbase.h"
#include "llsettingssky.h"
#include "llsettingswater.h"
#include "llsettingsdaycycle.h"

//-------------------------------------------------------------------------
class LLViewerCamera;
class LLGLSLShader;

//-------------------------------------------------------------------------
class LLEnvironment : public LLSingleton<LLEnvironment>
{
    LLSINGLETON(LLEnvironment);
    LOG_CLASS(LLEnvironment);

public:
    static const F32Seconds LLEnvironment::TRANSITION_INSTANT;
    static const F32Seconds LLEnvironment::TRANSITION_FAST;
    static const F32Seconds LLEnvironment::TRANSITION_DEFAULT;
    static const F32Seconds LLEnvironment::TRANSITION_SLOW;

    typedef boost::signals2::connection     connection_t;

    class UserPrefs
    {
        friend class LLEnvironment;
    public:
        UserPrefs();

        bool            getUseRegionSettings() const { return mUseRegionSettings; }
        bool            getUseDayCycle() const { return mUseDayCycle; }
        bool            getUseFixedSky() const { return !getUseDayCycle(); }

        std::string     getWaterPresetName() const { return mWaterPresetName; }
        std::string     getSkyPresetName() const { return mSkyPresetName; }
        std::string     getDayCycleName() const { return mDayCycleName; }

        void            setUseRegionSettings(bool val);
        void            setUseWaterPreset(const std::string& name);
        void            setUseSkyPreset(const std::string& name);
        void            setUseDayCycle(const std::string& name);

    private:
        void            load();
        void            store();

        bool			mUseRegionSettings;
        bool			mUseDayCycle;
        bool            mPersistEnvironment;
        std::string		mWaterPresetName;
        std::string		mSkyPresetName;
        std::string		mDayCycleName;
    };

    typedef std::map<std::string, LLSettingsBase::ptr_t>    namedSettingMap_t;
    typedef std::pair<std::string, LLUUID>                  name_id_t;
    typedef std::vector<name_id_t>                          list_name_id_t;
    typedef boost::signals2::signal<void()>                 change_signal_t;

    virtual ~LLEnvironment();

    void                        loadPreferences();
    const UserPrefs &           getPreferences() const { return mUserPrefs; }

    LLSettingsSky::ptr_t        getCurrentSky() const { return mCurrentSky; }
    LLSettingsWater::ptr_t      getCurrentWater() const { return mCurrentWater; }

    void                        update(const LLViewerCamera * cam);

    void                        updateGLVariablesForSettings(LLGLSLShader *shader, const LLSettingsBase::ptr_t &psetting);
    void                        updateShaderUniforms(LLGLSLShader *shader);

    void                        addSky(const LLSettingsSky::ptr_t &sky);
    void                        addWater(const LLSettingsWater::ptr_t &sky);
    void                        addDayCycle(const LLSettingsDayCycle::ptr_t &day);

    void                        selectSky(const std::string &name, F32Seconds transition = TRANSITION_DEFAULT);
    void                        selectSky(const LLSettingsSky::ptr_t &sky, F32Seconds transition = TRANSITION_DEFAULT);
    void                        applySky(const LLSettingsSky::ptr_t &sky = LLSettingsSky::ptr_t());
    void                        selectWater(const std::string &name, F32Seconds transition = TRANSITION_DEFAULT);
    void                        selectWater(const LLSettingsWater::ptr_t &water, F32Seconds transition = TRANSITION_DEFAULT);
    void                        applyWater(const LLSettingsWater::ptr_t water = LLSettingsWater::ptr_t());
    void                        selectDayCycle(const std::string &name, F32Seconds transition = TRANSITION_DEFAULT);
    void                        selectDayCycle(const LLSettingsDayCycle::ptr_t &daycycle, F32Seconds transition = TRANSITION_DEFAULT);
    void                        applyDayCycle(const LLSettingsDayCycle::ptr_t &daycycle = LLSettingsDayCycle::ptr_t());
    void                        clearAllSelected();
    void                        applyAllSelected();

    list_name_id_t              getSkyList() const;
    list_name_id_t              getWaterList() const;
    list_name_id_t              getDayCycleList() const;

    LLSettingsSky::ptr_t        findSkyByName(std::string name) const;
    LLSettingsWater::ptr_t      findWaterByName(std::string name) const;
    LLSettingsDayCycle::ptr_t   findDayCycleByName(std::string name) const;

    inline LLVector2            getCloudScrollDelta() const { return mCloudScrollDelta; }

    F32                         getCamHeight() const;
    F32                         getWaterHeight() const;
    bool                        getIsDayTime() const;   // "Day Time" is defined as the sun above the horizon.
    bool                        getIsNightTime() const { return !getIsDayTime(); } // "Not Day Time" 

    inline F32                  getSceneLightStrength() const { return mSceneLightStrength; }
    inline void                 setSceneLightStrength(F32 light_strength) { mSceneLightStrength = light_strength; }

    inline LLVector4            getLightDirection() const { return LLVector4(mCurrentSky->getLightDirection(), 0.0f); }
    inline LLVector4            getClampedLightDirection() const { return LLVector4(mCurrentSky->getClampedLightDirection(), 0.0f); }
    inline LLVector4            getRotatedLight() const { return mRotatedLight; }

    //-------------------------------------------
    connection_t                setSkyListChange(const change_signal_t::slot_type& cb);
    connection_t                setWaterListChange(const change_signal_t::slot_type& cb);
    connection_t                setDayCycleListChange(const change_signal_t::slot_type& cb);

    void                        onLegacyRegionSettings(LLSD data);

protected:
    virtual void                initSingleton();

private:
    static const F32            SUN_DELTA_YAW;
    static const F32            NIGHTTIME_ELEVATION_COS;

    typedef std::map<LLUUID, LLSettingsBase::ptr_t> AssetSettingMap_t;

    LLVector2                   mCloudScrollDelta;  // cumulative cloud delta

    LLSettingsSky::ptr_t        mSelectedSky;
    LLSettingsWater::ptr_t      mSelectedWater;
    LLSettingsDayCycle::ptr_t   mSelectedDayCycle;

    LLSettingsBlender::ptr_t              mBlenderSky;
    LLSettingsBlender::ptr_t              mBlenderWater;

    LLSettingsSky::ptr_t        mCurrentSky;
    LLSettingsWater::ptr_t      mCurrentWater;
    LLSettingsDayCycle::ptr_t   mCurrentDayCycle;

    namedSettingMap_t           mSkysByName;
    AssetSettingMap_t           mSkysById;

    namedSettingMap_t           mWaterByName;
    AssetSettingMap_t           mWaterById;

    namedSettingMap_t           mDayCycleByName;
    AssetSettingMap_t           mDayCycleById;

    F32                         mSceneLightStrength;
    LLVector4                   mRotatedLight;

    UserPrefs                   mUserPrefs;

    change_signal_t             mSkyListChange;
    change_signal_t             mWaterListChange;
    change_signal_t             mDayCycleListChange;

    void onSkyTransitionDone(const LLSettingsBlender::ptr_t &blender);
    void onWaterTransitionDone(const LLSettingsBlender::ptr_t &blender);


    //void addSky(const LLUUID &id, const LLSettingsSky::ptr_t &sky);
    void removeSky(const std::string &name);
    //void removeSky(const LLUUID &id);
    void clearAllSkys();

    //void addWater(const LLUUID &id, const LLSettingsSky::ptr_t &sky);
    void removeWater(const std::string &name);
    //void removeWater(const LLUUID &id);
    void clearAllWater();

    //void addDayCycle(const LLUUID &id, const LLSettingsSky::ptr_t &sky);
    void removeDayCycle(const std::string &name);
    //void removeDayCycle(const LLUUID &id);
    void clearAllDayCycles();


    void updateCloudScroll();

    void onRegionChange();

    //=========================================================================
    void                        legacyLoadAllPresets();
    LLSD                        legacyLoadPreset(const std::string& path);
    static std::string          getSysDir(const std::string &subdir);
    static std::string          getUserDir(const std::string &subdir);

};


#endif // LL_ENVIRONMENT_H