Fix line endlings

1 files changed, 799 insertions, 799 deletions

diff --git a/indra/newview/lllegacyatmospherics.cpp b/indra/newview/lllegacyatmospherics.cpp
index a30b0625ae..1403845d07 100644
--- a/indra/newview/lllegacyatmospherics.cpp
+++ b/indra/newview/lllegacyatmospherics.cpp
@@ -1,799 +1,799 @@
-/**

- * @file lllegacyatmospherics.cpp

- * @brief LLAtmospherics class implementation

- *

- * $LicenseInfo:firstyear=2001&license=viewerlgpl$

- * Second Life Viewer Source Code

- * Copyright (C) 2010, 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

- * $/LicenseInfo$

- */

-

-#include "llviewerprecompiledheaders.h"

-

-#include "lllegacyatmospherics.h"

-

-#include "llfeaturemanager.h"

-#include "llviewercontrol.h"

-#include "llframetimer.h"

-

-#include "llagent.h"

-#include "llagentcamera.h"

-#include "lldrawable.h"

-#include "llface.h"

-#include "llglheaders.h"

-#include "llsky.h"

-#include "llviewercamera.h"

-#include "llviewertexturelist.h"

-#include "llviewerobjectlist.h"

-#include "llviewerregion.h"

-#include "llworld.h"

-#include "pipeline.h"

-#include "v3colorutil.h"

-

-#include "llsettingssky.h"

-#include "llenvironment.h"

-#include "lldrawpoolwater.h"

-

-class LLFastLn

-{

-public:

-    LLFastLn()

-    {

-        mTable[0] = 0;

-        for( S32 i = 1; i < 257; i++ )

-        {

-            mTable[i] = log((F32)i);

-        }

-    }

-

-    F32 ln( F32 x )

-    {

-        const F32 OO_255 = 0.003921568627450980392156862745098f;

-        const F32 LN_255 = 5.5412635451584261462455391880218f;

-

-        if( x < OO_255 )

-        {

-            return log(x);

-        }

-        else

-        if( x < 1 )

-        {

-            x *= 255.f;

-            S32 index = llfloor(x);

-            F32 t = x - index;

-            F32 low = mTable[index];

-            F32 high = mTable[index + 1];

-            return low + t * (high - low) - LN_255;

-        }

-        else

-        if( x <= 255 )

-        {

-            S32 index = llfloor(x);

-            F32 t = x - index;

-            F32 low = mTable[index];

-            F32 high = mTable[index + 1];

-            return low + t * (high - low);

-        }

-        else

-        {

-            return log( x );

-        }

-    }

-

-    F32 pow( F32 x, F32 y )

-    {

-        return (F32)LL_FAST_EXP(y * ln(x));

-    }

-

-

-private:

-    F32 mTable[257]; // index 0 is unused

-};

-

-static LLFastLn gFastLn;

-

-

-// Functions used a lot.

-

-inline F32 LLHaze::calcPhase(const F32 cos_theta) const

-{

-    const F32 g2 = mG * mG;

-    const F32 den = 1 + g2 - 2 * mG * cos_theta;

-    return (1 - g2) * gFastLn.pow(den, -1.5);

-}

-

-inline void color_pow(LLColor3 &col, const F32 e)

-{

-    col.mV[0] = gFastLn.pow(col.mV[0], e);

-    col.mV[1] = gFastLn.pow(col.mV[1], e);

-    col.mV[2] = gFastLn.pow(col.mV[2], e);

-}

-

-inline LLColor3 color_norm(const LLColor3 &col)

-{

-    const F32 m = color_max(col);

-    if (m > 1.f)

-    {

-        return 1.f/m * col;

-    }

-    else return col;

-}

-

-inline void color_gamma_correct(LLColor3 &col)

-{

-    const F32 gamma_inv = 1.f/1.2f;

-    if (col.mV[0] != 0.f)

-    {

-        col.mV[0] = gFastLn.pow(col.mV[0], gamma_inv);

-    }

-    if (col.mV[1] != 0.f)

-    {

-        col.mV[1] = gFastLn.pow(col.mV[1], gamma_inv);

-    }

-    if (col.mV[2] != 0.f)

-    {

-        col.mV[2] = gFastLn.pow(col.mV[2], gamma_inv);

-    }

-}

-

-static LLColor3 calc_air_sca_sea_level()

-{

-    static LLColor3 WAVE_LEN(675, 520, 445);

-    static LLColor3 refr_ind = refr_ind_calc(WAVE_LEN);

-    static LLColor3 n21 = refr_ind * refr_ind - LLColor3(1, 1, 1);

-    static LLColor3 n4 = n21 * n21;

-    static LLColor3 wl2 = WAVE_LEN * WAVE_LEN * 1e-6f;

-    static LLColor3 wl4 = wl2 * wl2;

-    static LLColor3 mult_const = fsigma * 2.0f/ 3.0f * 1e24f * (F_PI * F_PI) * n4;

-    static F32 dens_div_N = F32( ATM_SEA_LEVEL_NDENS / Ndens2);

-    return dens_div_N * mult_const.divide(wl4);

-}

-

-// static constants.

-LLColor3 const LLHaze::sAirScaSeaLevel = calc_air_sca_sea_level();

-F32 const LLHaze::sAirScaIntense = color_intens(LLHaze::sAirScaSeaLevel);

-F32 const LLHaze::sAirScaAvg = LLHaze::sAirScaIntense / 3.f;

-

-/***************************************

-        Atmospherics

-***************************************/

-

-LLAtmospherics::LLAtmospherics()

-:   mCloudDensity(0.2f),

-    mWind(0.f),

-    mWorldScale(1.f)

-{

-    /// WL PARAMS

-    mInitialized = false;

-    mAmbientScale = gSavedSettings.getF32("SkyAmbientScale");

-    mNightColorShift = gSavedSettings.getColor3("SkyNightColorShift");

-    mFogColor.mV[VRED] = mFogColor.mV[VGREEN] = mFogColor.mV[VBLUE] = 0.5f;

-    mFogColor.mV[VALPHA] = 0.0f;

-    mFogRatio = 1.2f;

-    mHazeConcentration = 0.f;

-    mInterpVal = 0.f;

-}

-

-

-LLAtmospherics::~LLAtmospherics()

-{

-}

-

-void LLAtmospherics::init()

-{

-    const F32 haze_int = color_intens(mHaze.calcSigSca(0));

-    mHazeConcentration = haze_int / (color_intens(mHaze.calcAirSca(0)) + haze_int);

-    mInitialized = true;

-}

-

-// This cubemap is used as "environmentMap" in indra/newview/app_settings/shaders/class2/deferred/softenLightF.glsl

-LLColor4 LLAtmospherics::calcSkyColorInDir(const LLSettingsSky::ptr_t &psky, AtmosphericsVars& vars, const LLVector3 &dir, bool isShiny, bool low_end)

-{

-    const F32 sky_saturation = 0.25f;

-    const F32 land_saturation = 0.1f;

-

-    if (isShiny && dir.mV[VZ] < -0.02f)

-    {

-        LLColor4 col;

-        LLColor3 desat_fog = LLColor3(mFogColor);

-        F32 brightness = desat_fog.brightness();// NOTE: Linear brightness!

-        // So that shiny somewhat shows up at night.

-        if (brightness < 0.15f)

-        {

-            brightness = 0.15f;

-            desat_fog = smear(0.15f);

-        }

-        F32 greyscale_sat = brightness * (1.0f - land_saturation);

-        desat_fog = desat_fog * land_saturation + smear(greyscale_sat);

-        if (low_end)

-        {

-            col = LLColor4(desat_fog, 0.f);

-        }

-        else

-        {

-            col = LLColor4(desat_fog * 0.5f, 0.f);

-        }

-        float x = 1.0f-fabsf(-0.1f-dir.mV[VZ]);

-        x *= x;

-        col.mV[0] *= x*x;

-        col.mV[1] *= powf(x, 2.5f);

-        col.mV[2] *= x*x*x;

-        return col;

-    }

-

-    // undo OGL_TO_CFR_ROTATION and negate vertical direction.

-    LLVector3 Pn = LLVector3(-dir[1] , -dir[2], -dir[0]);

-

-    //calculates hazeColor

-    calcSkyColorWLVert(psky, Pn, vars);

-

-    if (isShiny)

-    {

-        F32 brightness = vars.hazeColor.brightness();

-        F32 greyscale_sat = brightness * (1.0f - sky_saturation);

-        LLColor3 sky_color = vars.hazeColor * sky_saturation + smear(greyscale_sat);

-        //sky_color *= (0.5f + 0.5f * brightness); // SL-12574 EEP sky is being attenuated too much

-        return LLColor4(sky_color, 0.0f);

-    }

-

-    LLColor3 sky_color = low_end ? vars.hazeColor * 2.0f : psky->gammaCorrect(vars.hazeColor * 2.0f, vars.gamma);

-

-    return LLColor4(sky_color, 0.0f);

-}

-

-// NOTE: Keep these in sync!

-//       indra\newview\app_settings\shaders\class1\deferred\skyV.glsl

-//       indra\newview\app_settings\shaders\class1\deferred\cloudsV.glsl

-//       indra\newview\lllegacyatmospherics.cpp

-void LLAtmospherics::calcSkyColorWLVert(const LLSettingsSky::ptr_t &psky, LLVector3 & Pn, AtmosphericsVars& vars)

-{

-    const LLColor3    blue_density = vars.blue_density;

-    const LLColor3    blue_horizon = vars.blue_horizon;

-    const F32         haze_horizon = vars.haze_horizon;

-    const F32         haze_density = vars.haze_density;

-    const F32         density_multiplier = vars.density_multiplier;

-

-    F32         max_y = vars.max_y;

-    LLVector4   sun_norm = vars.sun_norm;

-

-    // project the direction ray onto the sky dome.

-    F32 phi = acos(Pn[1]);

-    F32 sinA = sin(F_PI - phi);

-    if (fabsf(sinA) < 0.01f)

-    { //avoid division by zero

-        sinA = 0.01f;

-    }

-

-    F32 Plen = vars.dome_radius * sin(F_PI + phi + asin(vars.dome_offset * sinA)) / sinA;

-

-    Pn *= Plen;

-

-    // Set altitude

-    if (Pn[1] > 0.f)

-    {

-        Pn *= (max_y / Pn[1]);

-    }

-    else

-    {

-        Pn *= (-32000.f / Pn[1]);

-    }

-

-    Plen = Pn.length();

-    Pn /= Plen;

-

-    // Initialize temp variables

-    LLColor3 sunlight = vars.sunlight;

-    LLColor3 ambient = vars.ambient;

-

-    LLColor3 glow = vars.glow;

-    F32 cloud_shadow = vars.cloud_shadow;

-

-    // Sunlight attenuation effect (hue and brightness) due to atmosphere

-    // this is used later for sunlight modulation at various altitudes

-    LLColor3 light_atten = vars.light_atten;

-    LLColor3 light_transmittance = psky->getLightTransmittanceFast(vars.total_density, vars.density_multiplier, Plen);

-    (void)light_transmittance; // silence Clang warn-error

-

-    // Calculate relative weights

-    LLColor3 temp2(0.f, 0.f, 0.f);

-    LLColor3 temp1 = vars.total_density;

-

-    LLColor3 blue_weight = componentDiv(blue_density, temp1);

-    LLColor3 blue_factor = blue_horizon * blue_weight;

-    LLColor3 haze_weight = componentDiv(smear(haze_density), temp1);

-    LLColor3 haze_factor = haze_horizon * haze_weight;

-

-

-    // Compute sunlight from P & lightnorm (for long rays like sky)

-    temp2.mV[1] = llmax(F_APPROXIMATELY_ZERO, llmax(0.f, Pn[1]) * 1.0f + sun_norm.mV[1] );

-

-    temp2.mV[1] = 1.f / temp2.mV[1];

-    componentMultBy(sunlight, componentExp((light_atten * -1.f) * temp2.mV[1]));

-    componentMultBy(sunlight, light_transmittance);

-

-    // Distance

-    temp2.mV[2] = Plen * density_multiplier;

-

-    // Transparency (-> temp1)

-    temp1 = componentExp((temp1 * -1.f) * temp2.mV[2]);

-

-    // Compute haze glow

-    temp2.mV[0] = Pn * LLVector3(sun_norm);

-

-    temp2.mV[0] = 1.f - temp2.mV[0];

-        // temp2.x is 0 at the sun and increases away from sun

-    temp2.mV[0] = llmax(temp2.mV[0], .001f);

-        // Set a minimum "angle" (smaller glow.y allows tighter, brighter hotspot)

-

-    // Higher glow.x gives dimmer glow (because next step is 1 / "angle")

-    temp2.mV[0] *= glow.mV[0];

-

-    temp2.mV[0] = pow(temp2.mV[0], glow.mV[2]);

-        // glow.z should be negative, so we're doing a sort of (1 / "angle") function

-

-    // Add "minimum anti-solar illumination"

-    temp2.mV[0] += .25f;

-

-

-    // Haze color above cloud

-    vars.hazeColor = (blue_factor * (sunlight + ambient) + componentMult(haze_factor, sunlight * temp2.mV[0] + ambient));

-

-    // Increase ambient when there are more clouds

-    LLColor3 tmpAmbient = ambient + (LLColor3::white - ambient) * cloud_shadow * 0.5f;

-

-    // Dim sunlight by cloud shadow percentage

-    sunlight *= (1.f - cloud_shadow);

-

-    // Haze color below cloud

-    vars.hazeColorBelowCloud = (blue_factor * (sunlight + tmpAmbient) + componentMult(haze_factor, sunlight * temp2.mV[0] + tmpAmbient));

-

-    // Final atmosphere additive

-    componentMultBy(vars.hazeColor, LLColor3::white - temp1);

-

-/*

-    // SL-12574

-

-    // Attenuate cloud color by atmosphere

-    temp1 = componentSqrt(temp1);   //less atmos opacity (more transparency) below clouds

-

-    // At horizon, blend high altitude sky color towards the darker color below the clouds

-    vars.hazeColor += componentMult(vars.hazeColorBelowCloud - vars.hazeColor, LLColor3::white - componentSqrt(temp1));

-*/

-}

-

-void LLAtmospherics::updateFog(const F32 distance, const LLVector3& tosun_in)

-{

-    LLVector3 tosun = tosun_in;

-

-    if (!gPipeline.hasRenderDebugFeatureMask(LLPipeline::RENDER_DEBUG_FEATURE_FOG))

-    {

-        return;

-    }

-

-    LLColor4 target_fog(0.f, 0.2f, 0.5f, 0.f);

-

-    const F32 water_height = gAgent.getRegion() ? gAgent.getRegion()->getWaterHeight() : 0.f;

-    // LLWorld::getInstance()->getWaterHeight();

-    F32 camera_height = gAgentCamera.getCameraPositionAgent().mV[2];

-

-    F32 near_clip_height = LLViewerCamera::getInstance()->getAtAxis().mV[VZ] * LLViewerCamera::getInstance()->getNear();

-    camera_height += near_clip_height;

-

-    F32 fog_distance = 0.f;

-    LLColor3 res_color[3];

-

-    LLColor3 sky_fog_color = LLColor3::white;

-    LLColor3 render_fog_color = LLColor3::white;

-

-    const F32 tosun_z = tosun.mV[VZ];

-    tosun.mV[VZ] = 0.f;

-    tosun.normalize();

-    LLVector3 perp_tosun;

-    perp_tosun.mV[VX] = -tosun.mV[VY];

-    perp_tosun.mV[VY] = tosun.mV[VX];

-    LLVector3 tosun_45 = tosun + perp_tosun;

-    tosun_45.normalize();

-

-    F32 delta = 0.06f;

-    tosun.mV[VZ] = delta;

-    perp_tosun.mV[VZ] = delta;

-    tosun_45.mV[VZ] = delta;

-    tosun.normalize();

-    perp_tosun.normalize();

-    tosun_45.normalize();

-

-    // Sky colors, just slightly above the horizon in the direction of the sun, perpendicular to the sun, and at a 45 degree angle to the sun.

-    AtmosphericsVars vars;

-

-    LLSettingsSky::ptr_t psky = LLEnvironment::instance().getCurrentSky();

-

-    // NOTE: This is very similar to LLVOSky::cacheEnvironment()

-    // Differences:

-    //     vars.sun_norm

-    //     vars.sunlight

-    // invariants across whole sky tex process...

-    vars.blue_density = psky->getBlueDensity();

-    vars.blue_horizon = psky->getBlueHorizon();

-    vars.haze_density = psky->getHazeDensity();

-    vars.haze_horizon = psky->getHazeHorizon();

-    vars.density_multiplier = psky->getDensityMultiplier();

-    vars.distance_multiplier = psky->getDistanceMultiplier();

-    vars.max_y = psky->getMaxY();

-    vars.sun_norm = LLEnvironment::instance().getSunDirectionCFR();

-    vars.sunlight = psky->getSunlightColor();

-    vars.ambient = psky->getAmbientColor();

-    vars.glow = psky->getGlow();

-    vars.cloud_shadow = psky->getCloudShadow();

-    vars.dome_radius = psky->getDomeRadius();

-    vars.dome_offset = psky->getDomeOffset();

-    vars.light_atten = psky->getLightAttenuation(vars.max_y);

-    vars.light_transmittance = psky->getLightTransmittance(vars.max_y);

-    vars.total_density = psky->getTotalDensity();

-    vars.gamma = psky->getGamma();

-

-    res_color[0] = calcSkyColorInDir(psky, vars, tosun);

-    res_color[1] = calcSkyColorInDir(psky, vars, perp_tosun);

-    res_color[2] = calcSkyColorInDir(psky, vars, tosun_45);

-

-    sky_fog_color = color_norm(res_color[0] + res_color[1] + res_color[2]);

-

-    F32 full_off = -0.25f;

-    F32 full_on = 0.00f;

-    F32 on = (tosun_z - full_off) / (full_on - full_off);

-    on = llclamp(on, 0.01f, 1.f);

-    sky_fog_color *= 0.5f * on;

-

-

-    // We need to clamp these to non-zero, in order for the gamma correction to work. 0^y = ???

-    S32 i;

-    for (i = 0; i < 3; i++)

-    {

-        sky_fog_color.mV[i] = llmax(0.0001f, sky_fog_color.mV[i]);

-    }

-

-    color_gamma_correct(sky_fog_color);

-

-    render_fog_color = sky_fog_color;

-

-    fog_distance = mFogRatio * distance;

-

-    if (camera_height > water_height)

-    {

-        LLColor4 fog(render_fog_color);

-        mGLFogCol = fog;

-    }

-    else

-    {

-        LLSettingsWater::ptr_t pwater = LLEnvironment::instance().getCurrentWater();

-        F32 depth = water_height - camera_height;

-        LLColor4 water_fog_color(pwater->getWaterFogColor());

-

-        // adjust the color based on depth.  We're doing linear approximations

-        float depth_scale = gSavedSettings.getF32("WaterGLFogDepthScale");

-        float depth_modifier = 1.0f - llmin(llmax(depth / depth_scale, 0.01f),

-            gSavedSettings.getF32("WaterGLFogDepthFloor"));

-

-        LLColor4 fogCol = water_fog_color * depth_modifier;

-        fogCol.setAlpha(1);

-

-        // set the gl fog color

-        mGLFogCol = fogCol;

-    }

-

-    mFogColor = sky_fog_color;

-    mFogColor.setAlpha(1);

-

-    LLDrawPoolWater::sWaterFogEnd = fog_distance*2.2f;

-

-    stop_glerror();

-}

-

-// Functions used a lot.

-F32 color_norm_pow(LLColor3& col, F32 e, bool postmultiply)

-{

-    F32 mv = color_max(col);

-    if (0 == mv)

-    {

-        return 0;

-    }

-

-    col *= 1.f / mv;

-    color_pow(col, e);

-    if (postmultiply)

-    {

-        col *= mv;

-    }

-    return mv;

-}

-

-// Returns angle (RADIANs) between the horizontal projection of "v" and the x_axis.

-// Range of output is 0.0f to 2pi //359.99999...f

-// Returns 0.0f when "v" = +/- z_axis.

-F32 azimuth(const LLVector3 &v)

-{

-    F32 azimuth = 0.0f;

-    if (v.mV[VX] == 0.0f)

-    {

-        if (v.mV[VY] > 0.0f)

-        {

-            azimuth = F_PI * 0.5f;

-        }

-        else if (v.mV[VY] < 0.0f)

-        {

-            azimuth = F_PI * 1.5f;// 270.f;

-        }

-    }

-    else

-    {

-        azimuth = (F32) atan(v.mV[VY] / v.mV[VX]);

-        if (v.mV[VX] < 0.0f)

-        {

-            azimuth += F_PI;

-        }

-        else if (v.mV[VY] < 0.0f)

-        {

-            azimuth += F_PI * 2;

-        }

-    }

-    return azimuth;

-}

-

-bool operator==(const AtmosphericsVars& a, const AtmosphericsVars& b)

-{

-    if (a.hazeColor != b.hazeColor)

-    {

-        return false;

-    }

-

-    if (a.hazeColorBelowCloud != b.hazeColorBelowCloud)

-    {

-        return false;

-    }

-

-    if (a.cloudColorSun != b.cloudColorSun)

-    {

-        return false;

-    }

-

-    if (a.cloudColorAmbient != b.cloudColorAmbient)

-    {

-        return false;

-    }

-

-    if (a.cloudDensity != b.cloudDensity)

-    {

-        return false;

-    }

-

-    if (a.density_multiplier != b.density_multiplier)

-    {

-        return false;

-    }

-

-    if (a.haze_horizon != b.haze_horizon)

-    {

-        return false;

-    }

-

-    if (a.haze_density != b.haze_density)

-    {

-        return false;

-    }

-

-    if (a.blue_horizon != b.blue_horizon)

-    {

-        return false;

-    }

-

-    if (a.blue_density != b.blue_density)

-    {

-        return false;

-    }

-

-    if (a.dome_offset != b.dome_offset)

-    {

-        return false;

-    }

-

-    if (a.dome_radius != b.dome_radius)

-    {

-        return false;

-    }

-

-    if (a.cloud_shadow != b.cloud_shadow)

-    {

-        return false;

-    }

-

-    if (a.glow != b.glow)

-    {

-        return false;

-    }

-

-    if (a.ambient != b.ambient)

-    {

-        return false;

-    }

-

-    if (a.sunlight != b.sunlight)

-    {

-        return false;

-    }

-

-    if (a.sun_norm != b.sun_norm)

-    {

-        return false;

-    }

-

-    if (a.gamma != b.gamma)

-    {

-        return false;

-    }

-

-    if (a.max_y != b.max_y)

-    {

-        return false;

-    }

-

-    if (a.distance_multiplier != b.distance_multiplier)

-    {

-        return false;

-    }

-

-    // light_atten, light_transmittance, total_density

-    // are ignored as they always change when the values above do

-    // they're just shared calc across the sky map generation to save cycles

-

-    return true;

-}

-

-bool approximatelyEqual(const F32 &a, const  F32 &b, const F32 &fraction_treshold)

-{

-    F32 diff = fabs(a - b);

-    if (diff < F_APPROXIMATELY_ZERO || diff < llmax(fabs(a), fabs(b)) * fraction_treshold)

-    {

-        return true;

-    }

-    return false;

-}

-

-bool approximatelyEqual(const LLColor3 &a, const  LLColor3 &b, const F32 &fraction_treshold)

-{

-    return approximatelyEqual(a.mV[0], b.mV[0], fraction_treshold)

-           && approximatelyEqual(a.mV[1], b.mV[1], fraction_treshold)

-           && approximatelyEqual(a.mV[2], b.mV[2], fraction_treshold);

-}

-

-bool approximatelyEqual(const LLVector4 &a, const  LLVector4 &b, const F32 &fraction_treshold)

-{

-    return approximatelyEqual(a.mV[0], b.mV[0], fraction_treshold)

-        && approximatelyEqual(a.mV[1], b.mV[1], fraction_treshold)

-        && approximatelyEqual(a.mV[2], b.mV[2], fraction_treshold)

-        && approximatelyEqual(a.mV[3], b.mV[3], fraction_treshold);

-}

-

-bool approximatelyEqual(const AtmosphericsVars& a, const AtmosphericsVars& b, const F32 fraction_treshold)

-{

-    if (!approximatelyEqual(a.hazeColor, b.hazeColor, fraction_treshold))

-    {

-        return false;

-    }

-

-    if (!approximatelyEqual(a.hazeColorBelowCloud, b.hazeColorBelowCloud, fraction_treshold))

-    {

-        return false;

-    }

-

-    if (!approximatelyEqual(a.cloudColorSun, b.cloudColorSun, fraction_treshold))

-    {

-        return false;

-    }

-

-    if (!approximatelyEqual(a.cloudColorAmbient, b.cloudColorAmbient, fraction_treshold))

-    {

-        return false;

-    }

-

-    if (!approximatelyEqual(a.cloudDensity, b.cloudDensity, fraction_treshold))

-    {

-        return false;

-    }

-

-    if (!approximatelyEqual(a.density_multiplier, b.density_multiplier, fraction_treshold))

-    {

-        return false;

-    }

-

-    if (!approximatelyEqual(a.haze_horizon, b.haze_horizon, fraction_treshold))

-    {

-        return false;

-    }

-

-    if (!approximatelyEqual(a.haze_density, b.haze_density, fraction_treshold))

-    {

-        return false;

-    }

-

-    if (!approximatelyEqual(a.blue_horizon, b.blue_horizon, fraction_treshold))

-    {

-        return false;

-    }

-

-    if (!approximatelyEqual(a.blue_density, b.blue_density, fraction_treshold))

-    {

-        return false;

-    }

-

-    if (!approximatelyEqual(a.dome_offset, b.dome_offset, fraction_treshold))

-    {

-        return false;

-    }

-

-    if (!approximatelyEqual(a.dome_radius, b.dome_radius, fraction_treshold))

-    {

-        return false;

-    }

-

-    if (!approximatelyEqual(a.cloud_shadow, b.cloud_shadow, fraction_treshold))

-    {

-        return false;

-    }

-

-    if (!approximatelyEqual(a.glow, b.glow, fraction_treshold))

-    {

-        return false;

-    }

-

-    if (!approximatelyEqual(a.ambient, b.ambient, fraction_treshold))

-    {

-        return false;

-    }

-

-    if (!approximatelyEqual(a.sunlight, b.sunlight, fraction_treshold))

-    {

-        return false;

-    }

-

-    if (!approximatelyEqual(a.sun_norm, b.sun_norm, fraction_treshold))

-    {

-        return false;

-    }

-

-    if (!approximatelyEqual(a.gamma, b.gamma, fraction_treshold))

-    {

-        return false;

-    }

-

-    if (!approximatelyEqual(a.max_y, b.max_y, fraction_treshold))

-    {

-        return false;

-    }

-

-    if (!approximatelyEqual(a.distance_multiplier, b.distance_multiplier, fraction_treshold))

-    {

-        return false;

-    }

-

-    // light_atten, light_transmittance, total_density

-    // are ignored as they always change when the values above do

-    // they're just shared calc across the sky map generation to save cycles

-

-    return true;

-}

-

+/**
+ * @file lllegacyatmospherics.cpp
+ * @brief LLAtmospherics class implementation
+ *
+ * $LicenseInfo:firstyear=2001&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2010, 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
+ * $/LicenseInfo$
+ */
+
+#include "llviewerprecompiledheaders.h"
+
+#include "lllegacyatmospherics.h"
+
+#include "llfeaturemanager.h"
+#include "llviewercontrol.h"
+#include "llframetimer.h"
+
+#include "llagent.h"
+#include "llagentcamera.h"
+#include "lldrawable.h"
+#include "llface.h"
+#include "llglheaders.h"
+#include "llsky.h"
+#include "llviewercamera.h"
+#include "llviewertexturelist.h"
+#include "llviewerobjectlist.h"
+#include "llviewerregion.h"
+#include "llworld.h"
+#include "pipeline.h"
+#include "v3colorutil.h"
+
+#include "llsettingssky.h"
+#include "llenvironment.h"
+#include "lldrawpoolwater.h"
+
+class LLFastLn
+{
+public:
+    LLFastLn()
+    {
+        mTable[0] = 0;
+        for( S32 i = 1; i < 257; i++ )
+        {
+            mTable[i] = log((F32)i);
+        }
+    }
+
+    F32 ln( F32 x )
+    {
+        const F32 OO_255 = 0.003921568627450980392156862745098f;
+        const F32 LN_255 = 5.5412635451584261462455391880218f;
+
+        if( x < OO_255 )
+        {
+            return log(x);
+        }
+        else
+        if( x < 1 )
+        {
+            x *= 255.f;
+            S32 index = llfloor(x);
+            F32 t = x - index;
+            F32 low = mTable[index];
+            F32 high = mTable[index + 1];
+            return low + t * (high - low) - LN_255;
+        }
+        else
+        if( x <= 255 )
+        {
+            S32 index = llfloor(x);
+            F32 t = x - index;
+            F32 low = mTable[index];
+            F32 high = mTable[index + 1];
+            return low + t * (high - low);
+        }
+        else
+        {
+            return log( x );
+        }
+    }
+
+    F32 pow( F32 x, F32 y )
+    {
+        return (F32)LL_FAST_EXP(y * ln(x));
+    }
+
+
+private:
+    F32 mTable[257]; // index 0 is unused
+};
+
+static LLFastLn gFastLn;
+
+
+// Functions used a lot.
+
+inline F32 LLHaze::calcPhase(const F32 cos_theta) const
+{
+    const F32 g2 = mG * mG;
+    const F32 den = 1 + g2 - 2 * mG * cos_theta;
+    return (1 - g2) * gFastLn.pow(den, -1.5);
+}
+
+inline void color_pow(LLColor3 &col, const F32 e)
+{
+    col.mV[0] = gFastLn.pow(col.mV[0], e);
+    col.mV[1] = gFastLn.pow(col.mV[1], e);
+    col.mV[2] = gFastLn.pow(col.mV[2], e);
+}
+
+inline LLColor3 color_norm(const LLColor3 &col)
+{
+    const F32 m = color_max(col);
+    if (m > 1.f)
+    {
+        return 1.f/m * col;
+    }
+    else return col;
+}
+
+inline void color_gamma_correct(LLColor3 &col)
+{
+    const F32 gamma_inv = 1.f/1.2f;
+    if (col.mV[0] != 0.f)
+    {
+        col.mV[0] = gFastLn.pow(col.mV[0], gamma_inv);
+    }
+    if (col.mV[1] != 0.f)
+    {
+        col.mV[1] = gFastLn.pow(col.mV[1], gamma_inv);
+    }
+    if (col.mV[2] != 0.f)
+    {
+        col.mV[2] = gFastLn.pow(col.mV[2], gamma_inv);
+    }
+}
+
+static LLColor3 calc_air_sca_sea_level()
+{
+    static LLColor3 WAVE_LEN(675, 520, 445);
+    static LLColor3 refr_ind = refr_ind_calc(WAVE_LEN);
+    static LLColor3 n21 = refr_ind * refr_ind - LLColor3(1, 1, 1);
+    static LLColor3 n4 = n21 * n21;
+    static LLColor3 wl2 = WAVE_LEN * WAVE_LEN * 1e-6f;
+    static LLColor3 wl4 = wl2 * wl2;
+    static LLColor3 mult_const = fsigma * 2.0f/ 3.0f * 1e24f * (F_PI * F_PI) * n4;
+    static F32 dens_div_N = F32( ATM_SEA_LEVEL_NDENS / Ndens2);
+    return dens_div_N * mult_const.divide(wl4);
+}
+
+// static constants.
+LLColor3 const LLHaze::sAirScaSeaLevel = calc_air_sca_sea_level();
+F32 const LLHaze::sAirScaIntense = color_intens(LLHaze::sAirScaSeaLevel);
+F32 const LLHaze::sAirScaAvg = LLHaze::sAirScaIntense / 3.f;
+
+/***************************************
+        Atmospherics
+***************************************/
+
+LLAtmospherics::LLAtmospherics()
+:   mCloudDensity(0.2f),
+    mWind(0.f),
+    mWorldScale(1.f)
+{
+    /// WL PARAMS
+    mInitialized = false;
+    mAmbientScale = gSavedSettings.getF32("SkyAmbientScale");
+    mNightColorShift = gSavedSettings.getColor3("SkyNightColorShift");
+    mFogColor.mV[VRED] = mFogColor.mV[VGREEN] = mFogColor.mV[VBLUE] = 0.5f;
+    mFogColor.mV[VALPHA] = 0.0f;
+    mFogRatio = 1.2f;
+    mHazeConcentration = 0.f;
+    mInterpVal = 0.f;
+}
+
+
+LLAtmospherics::~LLAtmospherics()
+{
+}
+
+void LLAtmospherics::init()
+{
+    const F32 haze_int = color_intens(mHaze.calcSigSca(0));
+    mHazeConcentration = haze_int / (color_intens(mHaze.calcAirSca(0)) + haze_int);
+    mInitialized = true;
+}
+
+// This cubemap is used as "environmentMap" in indra/newview/app_settings/shaders/class2/deferred/softenLightF.glsl
+LLColor4 LLAtmospherics::calcSkyColorInDir(const LLSettingsSky::ptr_t &psky, AtmosphericsVars& vars, const LLVector3 &dir, bool isShiny, bool low_end)
+{
+    const F32 sky_saturation = 0.25f;
+    const F32 land_saturation = 0.1f;
+
+    if (isShiny && dir.mV[VZ] < -0.02f)
+    {
+        LLColor4 col;
+        LLColor3 desat_fog = LLColor3(mFogColor);
+        F32 brightness = desat_fog.brightness();// NOTE: Linear brightness!
+        // So that shiny somewhat shows up at night.
+        if (brightness < 0.15f)
+        {
+            brightness = 0.15f;
+            desat_fog = smear(0.15f);
+        }
+        F32 greyscale_sat = brightness * (1.0f - land_saturation);
+        desat_fog = desat_fog * land_saturation + smear(greyscale_sat);
+        if (low_end)
+        {
+            col = LLColor4(desat_fog, 0.f);
+        }
+        else
+        {
+            col = LLColor4(desat_fog * 0.5f, 0.f);
+        }
+        float x = 1.0f-fabsf(-0.1f-dir.mV[VZ]);
+        x *= x;
+        col.mV[0] *= x*x;
+        col.mV[1] *= powf(x, 2.5f);
+        col.mV[2] *= x*x*x;
+        return col;
+    }
+
+    // undo OGL_TO_CFR_ROTATION and negate vertical direction.
+    LLVector3 Pn = LLVector3(-dir[1] , -dir[2], -dir[0]);
+
+    //calculates hazeColor
+    calcSkyColorWLVert(psky, Pn, vars);
+
+    if (isShiny)
+    {
+        F32 brightness = vars.hazeColor.brightness();
+        F32 greyscale_sat = brightness * (1.0f - sky_saturation);
+        LLColor3 sky_color = vars.hazeColor * sky_saturation + smear(greyscale_sat);
+        //sky_color *= (0.5f + 0.5f * brightness); // SL-12574 EEP sky is being attenuated too much
+        return LLColor4(sky_color, 0.0f);
+    }
+
+    LLColor3 sky_color = low_end ? vars.hazeColor * 2.0f : psky->gammaCorrect(vars.hazeColor * 2.0f, vars.gamma);
+
+    return LLColor4(sky_color, 0.0f);
+}
+
+// NOTE: Keep these in sync!
+//       indra\newview\app_settings\shaders\class1\deferred\skyV.glsl
+//       indra\newview\app_settings\shaders\class1\deferred\cloudsV.glsl
+//       indra\newview\lllegacyatmospherics.cpp
+void LLAtmospherics::calcSkyColorWLVert(const LLSettingsSky::ptr_t &psky, LLVector3 & Pn, AtmosphericsVars& vars)
+{
+    const LLColor3    blue_density = vars.blue_density;
+    const LLColor3    blue_horizon = vars.blue_horizon;
+    const F32         haze_horizon = vars.haze_horizon;
+    const F32         haze_density = vars.haze_density;
+    const F32         density_multiplier = vars.density_multiplier;
+
+    F32         max_y = vars.max_y;
+    LLVector4   sun_norm = vars.sun_norm;
+
+    // project the direction ray onto the sky dome.
+    F32 phi = acos(Pn[1]);
+    F32 sinA = sin(F_PI - phi);
+    if (fabsf(sinA) < 0.01f)
+    { //avoid division by zero
+        sinA = 0.01f;
+    }
+
+    F32 Plen = vars.dome_radius * sin(F_PI + phi + asin(vars.dome_offset * sinA)) / sinA;
+
+    Pn *= Plen;
+
+    // Set altitude
+    if (Pn[1] > 0.f)
+    {
+        Pn *= (max_y / Pn[1]);
+    }
+    else
+    {
+        Pn *= (-32000.f / Pn[1]);
+    }
+
+    Plen = Pn.length();
+    Pn /= Plen;
+
+    // Initialize temp variables
+    LLColor3 sunlight = vars.sunlight;
+    LLColor3 ambient = vars.ambient;
+
+    LLColor3 glow = vars.glow;
+    F32 cloud_shadow = vars.cloud_shadow;
+
+    // Sunlight attenuation effect (hue and brightness) due to atmosphere
+    // this is used later for sunlight modulation at various altitudes
+    LLColor3 light_atten = vars.light_atten;
+    LLColor3 light_transmittance = psky->getLightTransmittanceFast(vars.total_density, vars.density_multiplier, Plen);
+    (void)light_transmittance; // silence Clang warn-error
+
+    // Calculate relative weights
+    LLColor3 temp2(0.f, 0.f, 0.f);
+    LLColor3 temp1 = vars.total_density;
+
+    LLColor3 blue_weight = componentDiv(blue_density, temp1);
+    LLColor3 blue_factor = blue_horizon * blue_weight;
+    LLColor3 haze_weight = componentDiv(smear(haze_density), temp1);
+    LLColor3 haze_factor = haze_horizon * haze_weight;
+
+
+    // Compute sunlight from P & lightnorm (for long rays like sky)
+    temp2.mV[1] = llmax(F_APPROXIMATELY_ZERO, llmax(0.f, Pn[1]) * 1.0f + sun_norm.mV[1] );
+
+    temp2.mV[1] = 1.f / temp2.mV[1];
+    componentMultBy(sunlight, componentExp((light_atten * -1.f) * temp2.mV[1]));
+    componentMultBy(sunlight, light_transmittance);
+
+    // Distance
+    temp2.mV[2] = Plen * density_multiplier;
+
+    // Transparency (-> temp1)
+    temp1 = componentExp((temp1 * -1.f) * temp2.mV[2]);
+
+    // Compute haze glow
+    temp2.mV[0] = Pn * LLVector3(sun_norm);
+
+    temp2.mV[0] = 1.f - temp2.mV[0];
+        // temp2.x is 0 at the sun and increases away from sun
+    temp2.mV[0] = llmax(temp2.mV[0], .001f);
+        // Set a minimum "angle" (smaller glow.y allows tighter, brighter hotspot)
+
+    // Higher glow.x gives dimmer glow (because next step is 1 / "angle")
+    temp2.mV[0] *= glow.mV[0];
+
+    temp2.mV[0] = pow(temp2.mV[0], glow.mV[2]);
+        // glow.z should be negative, so we're doing a sort of (1 / "angle") function
+
+    // Add "minimum anti-solar illumination"
+    temp2.mV[0] += .25f;
+
+
+    // Haze color above cloud
+    vars.hazeColor = (blue_factor * (sunlight + ambient) + componentMult(haze_factor, sunlight * temp2.mV[0] + ambient));
+
+    // Increase ambient when there are more clouds
+    LLColor3 tmpAmbient = ambient + (LLColor3::white - ambient) * cloud_shadow * 0.5f;
+
+    // Dim sunlight by cloud shadow percentage
+    sunlight *= (1.f - cloud_shadow);
+
+    // Haze color below cloud
+    vars.hazeColorBelowCloud = (blue_factor * (sunlight + tmpAmbient) + componentMult(haze_factor, sunlight * temp2.mV[0] + tmpAmbient));
+
+    // Final atmosphere additive
+    componentMultBy(vars.hazeColor, LLColor3::white - temp1);
+
+/*
+    // SL-12574
+
+    // Attenuate cloud color by atmosphere
+    temp1 = componentSqrt(temp1);   //less atmos opacity (more transparency) below clouds
+
+    // At horizon, blend high altitude sky color towards the darker color below the clouds
+    vars.hazeColor += componentMult(vars.hazeColorBelowCloud - vars.hazeColor, LLColor3::white - componentSqrt(temp1));
+*/
+}
+
+void LLAtmospherics::updateFog(const F32 distance, const LLVector3& tosun_in)
+{
+    LLVector3 tosun = tosun_in;
+
+    if (!gPipeline.hasRenderDebugFeatureMask(LLPipeline::RENDER_DEBUG_FEATURE_FOG))
+    {
+        return;
+    }
+
+    LLColor4 target_fog(0.f, 0.2f, 0.5f, 0.f);
+
+    const F32 water_height = gAgent.getRegion() ? gAgent.getRegion()->getWaterHeight() : 0.f;
+    // LLWorld::getInstance()->getWaterHeight();
+    F32 camera_height = gAgentCamera.getCameraPositionAgent().mV[2];
+
+    F32 near_clip_height = LLViewerCamera::getInstance()->getAtAxis().mV[VZ] * LLViewerCamera::getInstance()->getNear();
+    camera_height += near_clip_height;
+
+    F32 fog_distance = 0.f;
+    LLColor3 res_color[3];
+
+    LLColor3 sky_fog_color = LLColor3::white;
+    LLColor3 render_fog_color = LLColor3::white;
+
+    const F32 tosun_z = tosun.mV[VZ];
+    tosun.mV[VZ] = 0.f;
+    tosun.normalize();
+    LLVector3 perp_tosun;
+    perp_tosun.mV[VX] = -tosun.mV[VY];
+    perp_tosun.mV[VY] = tosun.mV[VX];
+    LLVector3 tosun_45 = tosun + perp_tosun;
+    tosun_45.normalize();
+
+    F32 delta = 0.06f;
+    tosun.mV[VZ] = delta;
+    perp_tosun.mV[VZ] = delta;
+    tosun_45.mV[VZ] = delta;
+    tosun.normalize();
+    perp_tosun.normalize();
+    tosun_45.normalize();
+
+    // Sky colors, just slightly above the horizon in the direction of the sun, perpendicular to the sun, and at a 45 degree angle to the sun.
+    AtmosphericsVars vars;
+
+    LLSettingsSky::ptr_t psky = LLEnvironment::instance().getCurrentSky();
+
+    // NOTE: This is very similar to LLVOSky::cacheEnvironment()
+    // Differences:
+    //     vars.sun_norm
+    //     vars.sunlight
+    // invariants across whole sky tex process...
+    vars.blue_density = psky->getBlueDensity();
+    vars.blue_horizon = psky->getBlueHorizon();
+    vars.haze_density = psky->getHazeDensity();
+    vars.haze_horizon = psky->getHazeHorizon();
+    vars.density_multiplier = psky->getDensityMultiplier();
+    vars.distance_multiplier = psky->getDistanceMultiplier();
+    vars.max_y = psky->getMaxY();
+    vars.sun_norm = LLEnvironment::instance().getSunDirectionCFR();
+    vars.sunlight = psky->getSunlightColor();
+    vars.ambient = psky->getAmbientColor();
+    vars.glow = psky->getGlow();
+    vars.cloud_shadow = psky->getCloudShadow();
+    vars.dome_radius = psky->getDomeRadius();
+    vars.dome_offset = psky->getDomeOffset();
+    vars.light_atten = psky->getLightAttenuation(vars.max_y);
+    vars.light_transmittance = psky->getLightTransmittance(vars.max_y);
+    vars.total_density = psky->getTotalDensity();
+    vars.gamma = psky->getGamma();
+
+    res_color[0] = calcSkyColorInDir(psky, vars, tosun);
+    res_color[1] = calcSkyColorInDir(psky, vars, perp_tosun);
+    res_color[2] = calcSkyColorInDir(psky, vars, tosun_45);
+
+    sky_fog_color = color_norm(res_color[0] + res_color[1] + res_color[2]);
+
+    F32 full_off = -0.25f;
+    F32 full_on = 0.00f;
+    F32 on = (tosun_z - full_off) / (full_on - full_off);
+    on = llclamp(on, 0.01f, 1.f);
+    sky_fog_color *= 0.5f * on;
+
+
+    // We need to clamp these to non-zero, in order for the gamma correction to work. 0^y = ???
+    S32 i;
+    for (i = 0; i < 3; i++)
+    {
+        sky_fog_color.mV[i] = llmax(0.0001f, sky_fog_color.mV[i]);
+    }
+
+    color_gamma_correct(sky_fog_color);
+
+    render_fog_color = sky_fog_color;
+
+    fog_distance = mFogRatio * distance;
+
+    if (camera_height > water_height)
+    {
+        LLColor4 fog(render_fog_color);
+        mGLFogCol = fog;
+    }
+    else
+    {
+        LLSettingsWater::ptr_t pwater = LLEnvironment::instance().getCurrentWater();
+        F32 depth = water_height - camera_height;
+        LLColor4 water_fog_color(pwater->getWaterFogColor());
+
+        // adjust the color based on depth.  We're doing linear approximations
+        float depth_scale = gSavedSettings.getF32("WaterGLFogDepthScale");
+        float depth_modifier = 1.0f - llmin(llmax(depth / depth_scale, 0.01f),
+            gSavedSettings.getF32("WaterGLFogDepthFloor"));
+
+        LLColor4 fogCol = water_fog_color * depth_modifier;
+        fogCol.setAlpha(1);
+
+        // set the gl fog color
+        mGLFogCol = fogCol;
+    }
+
+    mFogColor = sky_fog_color;
+    mFogColor.setAlpha(1);
+
+    LLDrawPoolWater::sWaterFogEnd = fog_distance*2.2f;
+
+    stop_glerror();
+}
+
+// Functions used a lot.
+F32 color_norm_pow(LLColor3& col, F32 e, bool postmultiply)
+{
+    F32 mv = color_max(col);
+    if (0 == mv)
+    {
+        return 0;
+    }
+
+    col *= 1.f / mv;
+    color_pow(col, e);
+    if (postmultiply)
+    {
+        col *= mv;
+    }
+    return mv;
+}
+
+// Returns angle (RADIANs) between the horizontal projection of "v" and the x_axis.
+// Range of output is 0.0f to 2pi //359.99999...f
+// Returns 0.0f when "v" = +/- z_axis.
+F32 azimuth(const LLVector3 &v)
+{
+    F32 azimuth = 0.0f;
+    if (v.mV[VX] == 0.0f)
+    {
+        if (v.mV[VY] > 0.0f)
+        {
+            azimuth = F_PI * 0.5f;
+        }
+        else if (v.mV[VY] < 0.0f)
+        {
+            azimuth = F_PI * 1.5f;// 270.f;
+        }
+    }
+    else
+    {
+        azimuth = (F32) atan(v.mV[VY] / v.mV[VX]);
+        if (v.mV[VX] < 0.0f)
+        {
+            azimuth += F_PI;
+        }
+        else if (v.mV[VY] < 0.0f)
+        {
+            azimuth += F_PI * 2;
+        }
+    }
+    return azimuth;
+}
+
+bool operator==(const AtmosphericsVars& a, const AtmosphericsVars& b)
+{
+    if (a.hazeColor != b.hazeColor)
+    {
+        return false;
+    }
+
+    if (a.hazeColorBelowCloud != b.hazeColorBelowCloud)
+    {
+        return false;
+    }
+
+    if (a.cloudColorSun != b.cloudColorSun)
+    {
+        return false;
+    }
+
+    if (a.cloudColorAmbient != b.cloudColorAmbient)
+    {
+        return false;
+    }
+
+    if (a.cloudDensity != b.cloudDensity)
+    {
+        return false;
+    }
+
+    if (a.density_multiplier != b.density_multiplier)
+    {
+        return false;
+    }
+
+    if (a.haze_horizon != b.haze_horizon)
+    {
+        return false;
+    }
+
+    if (a.haze_density != b.haze_density)
+    {
+        return false;
+    }
+
+    if (a.blue_horizon != b.blue_horizon)
+    {
+        return false;
+    }
+
+    if (a.blue_density != b.blue_density)
+    {
+        return false;
+    }
+
+    if (a.dome_offset != b.dome_offset)
+    {
+        return false;
+    }
+
+    if (a.dome_radius != b.dome_radius)
+    {
+        return false;
+    }
+
+    if (a.cloud_shadow != b.cloud_shadow)
+    {
+        return false;
+    }
+
+    if (a.glow != b.glow)
+    {
+        return false;
+    }
+
+    if (a.ambient != b.ambient)
+    {
+        return false;
+    }
+
+    if (a.sunlight != b.sunlight)
+    {
+        return false;
+    }
+
+    if (a.sun_norm != b.sun_norm)
+    {
+        return false;
+    }
+
+    if (a.gamma != b.gamma)
+    {
+        return false;
+    }
+
+    if (a.max_y != b.max_y)
+    {
+        return false;
+    }
+
+    if (a.distance_multiplier != b.distance_multiplier)
+    {
+        return false;
+    }
+
+    // light_atten, light_transmittance, total_density
+    // are ignored as they always change when the values above do
+    // they're just shared calc across the sky map generation to save cycles
+
+    return true;
+}
+
+bool approximatelyEqual(const F32 &a, const  F32 &b, const F32 &fraction_treshold)
+{
+    F32 diff = fabs(a - b);
+    if (diff < F_APPROXIMATELY_ZERO || diff < llmax(fabs(a), fabs(b)) * fraction_treshold)
+    {
+        return true;
+    }
+    return false;
+}
+
+bool approximatelyEqual(const LLColor3 &a, const  LLColor3 &b, const F32 &fraction_treshold)
+{
+    return approximatelyEqual(a.mV[0], b.mV[0], fraction_treshold)
+           && approximatelyEqual(a.mV[1], b.mV[1], fraction_treshold)
+           && approximatelyEqual(a.mV[2], b.mV[2], fraction_treshold);
+}
+
+bool approximatelyEqual(const LLVector4 &a, const  LLVector4 &b, const F32 &fraction_treshold)
+{
+    return approximatelyEqual(a.mV[0], b.mV[0], fraction_treshold)
+        && approximatelyEqual(a.mV[1], b.mV[1], fraction_treshold)
+        && approximatelyEqual(a.mV[2], b.mV[2], fraction_treshold)
+        && approximatelyEqual(a.mV[3], b.mV[3], fraction_treshold);
+}
+
+bool approximatelyEqual(const AtmosphericsVars& a, const AtmosphericsVars& b, const F32 fraction_treshold)
+{
+    if (!approximatelyEqual(a.hazeColor, b.hazeColor, fraction_treshold))
+    {
+        return false;
+    }
+
+    if (!approximatelyEqual(a.hazeColorBelowCloud, b.hazeColorBelowCloud, fraction_treshold))
+    {
+        return false;
+    }
+
+    if (!approximatelyEqual(a.cloudColorSun, b.cloudColorSun, fraction_treshold))
+    {
+        return false;
+    }
+
+    if (!approximatelyEqual(a.cloudColorAmbient, b.cloudColorAmbient, fraction_treshold))
+    {
+        return false;
+    }
+
+    if (!approximatelyEqual(a.cloudDensity, b.cloudDensity, fraction_treshold))
+    {
+        return false;
+    }
+
+    if (!approximatelyEqual(a.density_multiplier, b.density_multiplier, fraction_treshold))
+    {
+        return false;
+    }
+
+    if (!approximatelyEqual(a.haze_horizon, b.haze_horizon, fraction_treshold))
+    {
+        return false;
+    }
+
+    if (!approximatelyEqual(a.haze_density, b.haze_density, fraction_treshold))
+    {
+        return false;
+    }
+
+    if (!approximatelyEqual(a.blue_horizon, b.blue_horizon, fraction_treshold))
+    {
+        return false;
+    }
+
+    if (!approximatelyEqual(a.blue_density, b.blue_density, fraction_treshold))
+    {
+        return false;
+    }
+
+    if (!approximatelyEqual(a.dome_offset, b.dome_offset, fraction_treshold))
+    {
+        return false;
+    }
+
+    if (!approximatelyEqual(a.dome_radius, b.dome_radius, fraction_treshold))
+    {
+        return false;
+    }
+
+    if (!approximatelyEqual(a.cloud_shadow, b.cloud_shadow, fraction_treshold))
+    {
+        return false;
+    }
+
+    if (!approximatelyEqual(a.glow, b.glow, fraction_treshold))
+    {
+        return false;
+    }
+
+    if (!approximatelyEqual(a.ambient, b.ambient, fraction_treshold))
+    {
+        return false;
+    }
+
+    if (!approximatelyEqual(a.sunlight, b.sunlight, fraction_treshold))
+    {
+        return false;
+    }
+
+    if (!approximatelyEqual(a.sun_norm, b.sun_norm, fraction_treshold))
+    {
+        return false;
+    }
+
+    if (!approximatelyEqual(a.gamma, b.gamma, fraction_treshold))
+    {
+        return false;
+    }
+
+    if (!approximatelyEqual(a.max_y, b.max_y, fraction_treshold))
+    {
+        return false;
+    }
+
+    if (!approximatelyEqual(a.distance_multiplier, b.distance_multiplier, fraction_treshold))
+    {
+        return false;
+    }
+
+    // light_atten, light_transmittance, total_density
+    // are ignored as they always change when the values above do
+    // they're just shared calc across the sky map generation to save cycles
+
+    return true;
+}
+