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Diffstat (limited to 'indra/newview/lllegacyatmospherics.h')
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1 files changed, 250 insertions, 0 deletions
diff --git a/indra/newview/lllegacyatmospherics.h b/indra/newview/lllegacyatmospherics.h new file mode 100644 index 0000000000..ded7e1f554 --- /dev/null +++ b/indra/newview/lllegacyatmospherics.h @@ -0,0 +1,250 @@ +/** + * @file lllegacyatmospherics.h + * @brief LLVOSky class header file + * + * $LicenseInfo:firstyear=2001&license=viewerlgpl$ + * 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 + * $/LicenseInfo$ + */ + +#ifndef LL_LLLEGACYATMOSPHERICS_H +#define LL_LLLEGACYATMOSPHERICS_H + +#include "stdtypes.h" +#include "v3color.h" +#include "v4coloru.h" +#include "llviewertexture.h" +#include "llviewerobject.h" +#include "llframetimer.h" +#include "v3colorutil.h" +#include "llsettingssky.h" + +////////////////////////////////// +// +// Lots of constants +// +// Will clean these up at some point... +// + +const F32 HORIZON_DIST = 1024.0f; +const F32 ATM_EXP_FALLOFF = 0.000126f; +const F32 ATM_SEA_LEVEL_NDENS = 2.55e25f; +const F32 ATM_HEIGHT = 100000.f; + +// constants used in calculation of scattering coeff of clear air +const F32 sigma = 0.035f; +const F32 fsigma = (6.f + 3.f * sigma) / (6.f-7.f*sigma); +const F64 Ndens = 2.55e25; +const F64 Ndens2 = Ndens*Ndens; + +class LLFace; +class LLHaze; + +LL_FORCE_INLINE LLColor3 refr_ind_calc(const LLColor3 &wave_length) +{ + LLColor3 refr_ind; + for (S32 i = 0; i < 3; ++i) + { + const F32 wl2 = wave_length.mV[i] * wave_length.mV[i] * 1e-6f; + refr_ind.mV[i] = 6.43e3f + ( 2.95e6f / ( 146.0f - 1.f/wl2 ) ) + ( 2.55e4f / ( 41.0f - 1.f/wl2 ) ); + refr_ind.mV[i] *= 1.0e-8f; + refr_ind.mV[i] += 1.f; + } + return refr_ind; +} + + +class LLHaze +{ +public: + LLHaze() : mG(0), mFalloff(1), mAbsCoef(0.f) {mSigSca.setToBlack();} + LLHaze(const F32 g, const LLColor3& sca, const F32 fo = 2.f) : + mG(g), mSigSca(0.25f/F_PI * sca), mFalloff(fo), mAbsCoef(0.f) + { + mAbsCoef = color_intens(mSigSca) / sAirScaIntense; + } + + LLHaze(const F32 g, const F32 sca, const F32 fo = 2.f) : mG(g), + mSigSca(0.25f/F_PI * LLColor3(sca, sca, sca)), mFalloff(fo) + { + mAbsCoef = 0.01f * sca / sAirScaAvg; + } + +/* Proportion of light that is scattered into 'path' from 'in' over distance dt. */ +/* assumes that vectors 'path' and 'in' are normalized. Scattering coef / 2pi */ + + LL_FORCE_INLINE LLColor3 calcAirSca(const F32 h) + { + return calcFalloff(h) * sAirScaSeaLevel; + } + + LL_FORCE_INLINE void calcAirSca(const F32 h, LLColor3 &result) + { + result = sAirScaSeaLevel; + result *= calcFalloff(h); + } + + F32 getG() const { return mG; } + + void setG(const F32 g) + { + mG = g; + } + + const LLColor3& getSigSca() const // sea level + { + return mSigSca; + } + + void setSigSca(const LLColor3& s) + { + mSigSca = s; + mAbsCoef = 0.01f * color_intens(mSigSca) / sAirScaIntense; + } + + void setSigSca(const F32 s0, const F32 s1, const F32 s2) + { + mSigSca = sAirScaAvg * LLColor3 (s0, s1, s2); + mAbsCoef = 0.01f * (s0 + s1 + s2) / 3; + } + + F32 getFalloff() const + { + return mFalloff; + } + + void setFalloff(const F32 fo) + { + mFalloff = fo; + } + + F32 getAbsCoef() const + { + return mAbsCoef; + } + + inline static F32 calcFalloff(const F32 h) + { + return (h <= 0) ? 1.0f : (F32)LL_FAST_EXP(-ATM_EXP_FALLOFF * h); + } + + inline LLColor3 calcSigSca(const F32 h) const + { + return calcFalloff(h * mFalloff) * mSigSca; + } + + inline void calcSigSca(const F32 h, LLColor3 &result) const + { + result = mSigSca; + result *= calcFalloff(h * mFalloff); + } + + LLColor3 calcSigExt(const F32 h) const + { + return calcFalloff(h * mFalloff) * (1 + mAbsCoef) * mSigSca; + } + + F32 calcPhase(const F32 cos_theta) const; + +private: + static LLColor3 const sAirScaSeaLevel; + static F32 const sAirScaIntense; + static F32 const sAirScaAvg; + +protected: + F32 mG; + LLColor3 mSigSca; + F32 mFalloff; // 1 - slow, >1 - faster + F32 mAbsCoef; +}; + + +class LLCubeMap; + +class AtmosphericsVars +{ +public: + AtmosphericsVars() + : hazeColor(0,0,0) + , hazeColorBelowCloud(0,0,0) + , cloudColorSun(0,0,0) + , cloudColorAmbient(0,0,0) + , cloudDensity(0.0f) + { + horizontalProjection[0] = LLVector2(0,0); + horizontalProjection[1] = LLVector2(0,0); + } + + LLColor3 hazeColor; + LLColor3 hazeColorBelowCloud; + LLColor3 cloudColorSun; + LLColor3 cloudColorAmbient; + F32 cloudDensity; + LLVector2 horizontalProjection[2]; +}; + +class LLAtmospherics +{ +public: + LLAtmospherics(); + ~LLAtmospherics(); + + void init(); + void updateFog(const F32 distance, const LLVector3& tosun); + + const LLHaze& getHaze() const { return mHaze; } + LLHaze& getHaze() { return mHaze; } + F32 getHazeConcentration() const { return mHazeConcentration; } + void setHaze(const LLHaze& h) { mHaze = h; } + void setFogRatio(const F32 fog_ratio) { mFogRatio = fog_ratio; } + + F32 getFogRatio() const { return mFogRatio; } + LLColor4 getFogColor() const { return mFogColor; } + LLColor4 getGLFogColor() const { return mGLFogCol; } + + void setCloudDensity(F32 cloud_density) { mCloudDensity = cloud_density; } + void setWind ( const LLVector3& wind ) { mWind = wind.length(); } + + LLColor4 calcSkyColorInDir(const LLVector3& dir, bool isShiny = false); + +protected: + + void calcSkyColorWLVert(LLVector3 & Pn, AtmosphericsVars& vars); + LLColor3 calcSkyColorWLFrag(LLVector3 & Pn, AtmosphericsVars& vars); + LLColor3 getHazeColor(LLSettingsSky::ptr_t psky, AtmosphericsVars& vars, F32 costheta, F32 cloud_shadow); + + LLHaze mHaze; + F32 mHazeConcentration; + F32 mCloudDensity; + F32 mWind; + BOOL mInitialized; + LLVector3 mLastLightingDirection; + LLColor3 mLastTotalAmbient; + F32 mAmbientScale; + LLColor3 mNightColorShift; + F32 mInterpVal; + LLColor4 mFogColor; + LLColor4 mGLFogCol; + F32 mFogRatio; + F32 mWorldScale; + LLFrameTimer mUpdateTimer; +}; + +#endif |