source: orxonox.OLD/branches/atmospheric_engine/src/lib/graphics/effects/fog_effect.cc @ 8441

/*
        orxonox - the future of 3D-vertical-scrollers

        Copyright (C) 2004 orx

        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 2, or (at your option)
        any later version.

### File Specific:
        main-programmer: hdavid, amaechler
*/

#include "fog_effect.h"

#include "util/loading/load_param.h"
#include "util/loading/factory.h"

#include "glincl.h"

#include "shell_command.h"

SHELL_COMMAND(activate, FogEffect, activateFog);
SHELL_COMMAND(deactivate, FogEffect, deactivateFog);
SHELL_COMMAND(fadein, FogEffect, fadeInFog);
SHELL_COMMAND(fadeout, FogEffect, fadeOutFog);

// TODO: Fix fades

using namespace std;

CREATE_FACTORY(FogEffect, CL_FOG_EFFECT);

FogEffect::FogEffect(const TiXmlElement* root)
{
        this->setClassID(CL_FOG_EFFECT, "FogEffect");

        this->init();

        if (root != NULL)
                this->loadParams(root);

        if (this->fogActivate)
                this->activate();
}


FogEffect::~FogEffect()
{
        this->deactivate();
}


void FogEffect::loadParams(const TiXmlElement* root)
{
        WeatherEffect::loadParams(root);

        LoadParam(root, "mode", this, FogEffect, setFogMode);
        LoadParam(root, "density", this, FogEffect, setFogDensity);
        LoadParam(root, "range", this, FogEffect, setFogRange);
        LoadParam(root, "color", this, FogEffect, setFogColor);
        LoadParam(root, "fadeinduration", this, FogEffect, setFogFadeIn);
        LoadParam(root, "fadeoutduration", this, FogEffect, setFogFadeOut);

        LOAD_PARAM_START_CYCLE(root, element);
        {
                LoadParam_CYCLE(element, "option", this, FogEffect, setFogOption);
        }
        LOAD_PARAM_END_CYCLE(element);
}

bool FogEffect::init()
{
        //default values
        this->fogActivate = false;
        this->fogFadeInDuration = 0;
        this->fogFadeOutDuration = 0;
        this->localTimer = 0;
        
        this->fogMode = GL_LINEAR;
        this->fogDensity = 0.05;
        this->fogStart = 0;
        this->fogEnd = 500;
        this->colorVector = Vector(0.3, 0.3, 0.3);

        return 0;
}


bool FogEffect::activate()
{
        PRINTF(0)( "Enabling FogEffect, mode: %i, density: %f, start: %f, end: %f, color %f, %f, %f\n", this->fogMode, this->fogDensity, this->fogStart, this->fogEnd, this->colorVector.x, this->colorVector.y, this->colorVector.z);

        this->fogActivate = true;
        
        GLfloat fogColor[4] = { colorVector.x, colorVector.y, colorVector.z, 1.0};
        glFogi(GL_FOG_MODE, this->fogMode);
        glFogfv(GL_FOG_COLOR, fogColor);
        glFogf(GL_FOG_DENSITY, this->fogDensity);
        glHint(GL_FOG_HINT, GL_DONT_CARE);
        glFogf(GL_FOG_START, this->fogStart);
        glFogf(GL_FOG_END, this->fogEnd);
        
        glEnable(GL_FOG);
        // glClearColor(0.5, 0.5, 0.5, 1.0);

        return 0;
}


bool FogEffect::deactivate()
{
        PRINTF(0)("Deactivating FogEffect\n");

        this->fogActivate = false;
        
        glDisable(GL_FOG);

        return 0;
}

void FogEffect::draw() const {

        // If Fog Fade In
        if (this->fogFadeInDuration > 0 && this->localTimer < this->fogFadeInDuration)
                glFogf(GL_FOG_DENSITY, this->fogFadeInDensity);

        // If Fog Fade Out
        else if (this->fogFadeOutDuration > 0 && this->localTimer < this->fogFadeOutDuration)
                glFogf(GL_FOG_DENSITY, this->fogFadeOutDensity);

        // Normal Fog activate
        else
                glFogf(GL_FOG_DENSITY, this->fogDensity);

}
void FogEffect::tick(float dt)
{
        if (!this->fogActivate)
                return;
                
        if ( this->fogFadeInDuration > 0 && this->localTimer < this->fogFadeInDuration ) {
                this->localTimer += dt;
                float progress = this->localTimer / this->fogFadeInDuration;
                this->fogFadeInDensity = progress * this->fogDensity;
        }
        else if ( this->fogFadeOutDuration > 0 ) {
                if ( this->localTimer < this->fogFadeOutDuration ) {
                        this->localTimer += dt;
                        float progress = this->localTimer / this->fogFadeInDuration;
                        this->fogFadeOutDensity = 1 - progress * this->fogDensity;
                }
                else
                        this->deactivate();
        }
}

void FogEffect::fadeInFog() {

        // If Fog is already on, turn it off first
        if (this->fogActivate)
                this->deactivate();

        // If no manual FadeIn value was set, set a default value
        if (!this->fogFadeInDuration > 0)
                this->fogFadeInDuration = 20;

        // Reset local timer
        this->localTimer = 0;

        // Activate Fog
        this->activate();

}


void FogEffect::fadeOutFog() {

        // If Fog is off, turn it on first
        if (!this->fogActivate)
                this->activate();

        // If no manual FadeOut value was set, set a default value
        if (!this->fogFadeOutDuration > 0)
                this->fogFadeOutDuration = 20;

        // Reset local timer
        this->localTimer = 0;

}


GLint FogEffect::stringToFogMode(const std::string& mode)
{
        if(mode == "GL_LINEAR")
                return GL_LINEAR;
        else if(mode == "GL_EXP")
                return GL_EXP;
        else if(mode == "GL_EXP2" )
                return GL_EXP2;
        else
                return -1;
}