/**
 * @file llbakingshadermgr.h
 * @brief Texture Baking Shader Manager
 *
 * $LicenseInfo:firstyear=2012&license=viewerlgpl$
 * Second Life Viewer Source Code
 * Copyright (C) 2012, 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_BAKING_SHADER_MGR_H
#define LL_BAKING_SHADER_MGR_H

#include "llshadermgr.h"

class LLBakingShaderMgr: public LLShaderMgr
{
public:
    static bool sInitialized;
    static bool sSkipReload;

    LLBakingShaderMgr();
    ~LLBakingShaderMgr();

    // singleton pattern implementation
    static LLBakingShaderMgr * instance();

    void initAttribsAndUniforms(void) override;
    void setShaders();
    void unloadShaders();
    S32 getVertexShaderLevel(S32 type);
    bool loadShadersInterface();

    std::vector<S32> mVertexShaderLevel;
    S32 mMaxAvatarShaderLevel;

    enum EShaderClass
    {
        SHADER_LIGHTING,
        SHADER_OBJECT,
        SHADER_AVATAR,
        SHADER_ENVIRONMENT,
        SHADER_INTERFACE,
        SHADER_EFFECT,
        SHADER_WINDLIGHT,
        SHADER_WATER,
        SHADER_DEFERRED,
        SHADER_TRANSFORM,
        SHADER_COUNT
    };

    // simple model of forward iterator
    // http://www.sgi.com/tech/stl/ForwardIterator.html
    class shader_iter
    {
    private:
        friend bool operator == (shader_iter const & a, shader_iter const & b);
        friend bool operator != (shader_iter const & a, shader_iter const & b);

        typedef std::vector<LLGLSLShader *>::const_iterator base_iter_t;
    public:
        shader_iter()
        {
        }

        shader_iter(base_iter_t iter) : mIter(iter)
        {
        }

        LLGLSLShader & operator * () const
        {
            return **mIter;
        }

        LLGLSLShader * operator -> () const
        {
            return *mIter;
        }

        shader_iter & operator++ ()
        {
            ++mIter;
            return *this;
        }

        shader_iter operator++ (int)
        {
            return mIter++;
        }

    private:
        base_iter_t mIter;
    };

    shader_iter beginShaders() const;
    shader_iter endShaders() const;

    std::string getShaderDirPrefix(void) override;

    void updateShaderUniforms(LLGLSLShader * shader) override;

private:

    // the list of shaders we need to propagate parameters to.
    std::vector<LLGLSLShader *> mShaderList;

}; //LLBakingShaderMgr

inline bool operator == (LLBakingShaderMgr::shader_iter const & a, LLBakingShaderMgr::shader_iter const & b)
{
    return a.mIter == b.mIter;
}

inline bool operator != (LLBakingShaderMgr::shader_iter const & a, LLBakingShaderMgr::shader_iter const & b)
{
    return a.mIter != b.mIter;
}

extern LLVector4            gShinyOrigin;

#endif // LL_BAKING_SHADER_MGR_H