llsky.cpp

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//      Ideas:
//              -haze should be controlled by global query from sims
//              -need secondary optical effects on sun (flare)
//              -stars should be brought down from sims
//              -star intensity should be driven by global ambient level from sims,
//               so that eclipses, etc can be easily done.
//

#include "llviewerprecompiledheaders.h"

#include "llsky.h"

// linden library includes
#include "llerror.h"
#include "llmath.h"
#include "math.h"
#include "v4color.h"

#include "llviewerobjectlist.h"
#include "llviewerobject.h"
#include "llviewercamera.h"
#include "pipeline.h"
#include "llagent.h"
#include "lldrawpool.h"

#include "llvosky.h"
#include "llvostars.h"
#include "llcubemap.h"
#include "llviewercontrol.h"

extern LLPipeline gPipeline;

F32 azimuth_from_vector(const LLVector3 &v);
F32 elevation_from_vector(const LLVector3 &v);

// ---------------- LLSky ----------------

// Construction/Destruction

LLSky::LLSky()
{
        // Set initial clear color to black
        // Set fog color 
        mFogColor.mV[VRED] = mFogColor.mV[VGREEN] = mFogColor.mV[VBLUE] = 0.5f;
        mFogColor.mV[VALPHA] = 0.0f;

        mLightingGeneration = 0;
        mUpdatedThisFrame = TRUE;
        mOverrideSimSunPosition = FALSE;
        mSunPhase = 0.f;
}


LLSky::~LLSky()
{
}

void LLSky::cleanup()
{
        mVOSkyp = NULL;
        mVOStarsp = NULL;
        mVOGroundp = NULL;
}

void LLSky::destroyGL()
{
        if (!mVOSkyp.isNull() && mVOSkyp->getCubeMap())
        {
                mVOSkyp->cleanupGL();
        }
}

void LLSky::restoreGL()
{
        if (mVOSkyp)
        {
                mVOSkyp->restoreGL();
        }
}

void LLSky::setOverrideSun(BOOL override)
{
        if (!mOverrideSimSunPosition && override)
        {
                mLastSunDirection = getSunDirection();
        }
        else if (mOverrideSimSunPosition && !override)
        {
                setSunDirection(mLastSunDirection, LLVector3::zero);
        }
        mOverrideSimSunPosition = override;
}

void LLSky::setSunDirection(const LLVector3 &sun_direction, const LLVector3 &sun_ang_velocity)
{
        mVOSkyp->setSunDirection(sun_direction, sun_ang_velocity);
}


void LLSky::setSunTargetDirection(const LLVector3 &sun_direction, const LLVector3 &sun_ang_velocity)
{
        mSunTargDir = sun_direction;
}


LLVector3 LLSky::getSunDirection() const
{
        if (mVOSkyp)
        {
                return mVOSkyp->getToSun();
        }
        else
        {
                return LLVector3::z_axis;
        }
}


LLVector3 LLSky::getMoonDirection() const
{
        if (mVOSkyp)
        {
                return mVOSkyp->getToMoon();
        }
        else
        {
                return LLVector3::z_axis;
        }
}


LLColor4 LLSky::getSunDiffuseColor() const
{
        if (mVOSkyp)
        {
                return LLColor4(mVOSkyp->getSunDiffuseColor());
        }
        else
        {
                return LLColor4(1.f, 1.f, 1.f, 1.f);
        }
}


LLColor4 LLSky::getMoonDiffuseColor() const
{
        if (mVOSkyp)
        {
                return LLColor4(mVOSkyp->getMoonDiffuseColor());
        }
        else
        {
                return LLColor4(1.f, 1.f, 1.f, 1.f);
        }
}


LLColor4 LLSky::getTotalAmbientColor() const
{
        if (mVOSkyp)
        {
                return mVOSkyp->getTotalAmbientColor();
        }
        else
        {
                return LLColor4(1.f, 1.f, 1.f, 1.f);
        }
}


BOOL LLSky::sunUp() const
{
        if (mVOSkyp)
        {
                return mVOSkyp->isSunUp();
        }
        else
        {
                return TRUE;
        }
}


LLColor4 LLSky::calcInScatter(LLColor4& transp, const LLVector3 &point, F32 exag) const
{
        if (mVOSkyp)
        {
                return mVOSkyp->calcInScatter(transp, point, exag);
        }
        else
        {
                return LLColor4(1.f, 1.f, 1.f, 1.f);
        }
}


LLColor4U LLSky::getFadeColor() const
{
        if (mVOSkyp)
        {
                return mVOSkyp->getFadeColor();
        }
        else
        {
                return LLColor4(1.f, 1.f, 1.f, 1.f);
        }
}


// Public Methods


void LLSky::init(const LLVector3 &sun_direction)
{
        mVOSkyp = (LLVOSky *)gObjectList.createObjectViewer(LLViewerObject::LL_VO_SKY, gAgent.getRegion());
        mVOSkyp->initSunDirection(sun_direction, LLVector3());
        gPipeline.addObject((LLViewerObject *)mVOSkyp);

        mVOStarsp = (LLVOStars *)gObjectList.createObjectViewer(LLViewerObject::LL_VO_STARS, gAgent.getRegion());
        gPipeline.addObject((LLViewerObject *)mVOStarsp);
        
        mVOGroundp = (LLVOGround*)gObjectList.createObjectViewer(LLViewerObject::LL_VO_GROUND, gAgent.getRegion());
        LLVOGround *groundp = mVOGroundp;
        gPipeline.addObject((LLViewerObject *)groundp);

        gSky.setFogRatio(gSavedSettings.getF32("RenderFogRatio"));
        
        //
        // Legacy code, ignore
        //
        //

        // Get the parameters.
        mSunDefaultPosition = gSavedSettings.getVector3("SkySunDefaultPosition");


        if (gSavedSettings.getBOOL("SkyOverrideSimSunPosition") || mOverrideSimSunPosition)
        {
                setSunDirection(mSunDefaultPosition, LLVector3(0.f, 0.f, 0.f));
        }
        else
        {
                setSunDirection(sun_direction, LLVector3(0.f, 0.f, 0.f));
        }
        
        mUpdatedThisFrame = TRUE;
}


void LLSky::setCloudDensityAtAgent(F32 cloud_density)
{
        if (mVOSkyp)
        {
                mVOSkyp->setCloudDensity(cloud_density);
        }
}


void LLSky::setWind(const LLVector3& average_wind)
{
        if (mVOSkyp)
        {
                mVOSkyp->setWind(average_wind);
        }
}


void LLSky::propagateHeavenlyBodies(F32 dt)
{
        if (!mOverrideSimSunPosition)
        {
                LLVector3 curr_dir = getSunDirection();
                LLVector3 diff = mSunTargDir - curr_dir;
                const F32 dist = diff.normVec();
                if (dist > 0)
                {
                        const F32 step = llmin (dist, 0.00005f);
                        //const F32 step = min (dist, 0.0001);
                        diff *= step;
                        curr_dir += diff;
                        curr_dir.normVec();
                        if (mVOSkyp)
                        {
                                mVOSkyp->setSunDirection(curr_dir, LLVector3());
                        }
                }
        }
}

F32 LLSky::getSunPhase() const
{
        return mSunPhase;
}

void LLSky::setSunPhase(const F32 phase)
{
        mSunPhase = phase;
}

// Private Methods


LLColor4 LLSky::getFogColor() const
{
        if (mVOSkyp)
        {
                return mVOSkyp->getFogColor();
        }

        return LLColor4(1.f, 1.f, 1.f, 1.f);
}


void LLSky::updateFog(const F32 distance)
{
        if (mVOSkyp)
        {
                mVOSkyp->updateFog(distance);
        }
}

void LLSky::updateCull()
{
        /*if (mVOSkyp.notNull() && mVOSkyp->mDrawable.notNull())
        {
                gPipeline.markVisible(mVOSkyp->mDrawable);
        }
        else
        {
                llinfos << "No sky drawable!" << llendl;
        }*/

        if (mVOStarsp.notNull() && mVOStarsp->mDrawable.notNull())
        {
                gPipeline.markVisible(mVOStarsp->mDrawable, *gCamera);
        }
        else
        {
                llinfos << "No stars drawable!" << llendl;
        }

        /*if (mVOGroundp.notNull() && mVOGroundp->mDrawable.notNull())
        {
                gPipeline.markVisible(mVOGroundp->mDrawable);
        }*/
}

void LLSky::updateSky()
{
        if (!gPipeline.hasRenderType(LLPipeline::RENDER_TYPE_SKY))
        {
                return;
        }
        if (mVOSkyp)
        {
                mVOSkyp->updateSky();
        }
        if (mVOStarsp)
        {
                //if (mVOStarsp->mDrawable)
                //{
                //      gPipeline.markRebuild(mVOStarsp->mDrawable, LLDrawable::REBUILD_VOLUME, TRUE);
                //}
        }
}


void LLSky::setFogRatio(const F32 fog_ratio)
{
        if (mVOSkyp)
        {
                mVOSkyp->setFogRatio(fog_ratio);
        }
}


F32 LLSky::getFogRatio() const
{
        if (mVOSkyp)
        {
                return mVOSkyp->getFogRatio();
        }
        else
        {
                return 0.f;
        }
}


// Returns angle (DEGREES) between the horizontal plane and "v", 
// where the angle is negative when v.mV[VZ] < 0.0f
F32 elevation_from_vector(const LLVector3 &v)
{
        F32 elevation = 0.0f;
        F32 xy_component = (F32) sqrt(v.mV[VX] * v.mV[VX] + v.mV[VY] * v.mV[VY]);
        if (xy_component != 0.0f)
        {
                elevation = RAD_TO_DEG * (F32) atan(v.mV[VZ]/xy_component);
        }
        else
        {
                if (v.mV[VZ] > 0.f)
                {
                        elevation = 90.f;
                }
                else
                {
                        elevation = -90.f;
                }
        }
        return elevation;
}

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