From a172c9d9cf358c3d9329a1777e30f627f50d5aaa Mon Sep 17 00:00:00 2001 From: Ptolemy Date: Thu, 21 Oct 2021 16:46:06 -0700 Subject: SL-16127: Replace slow getLightTransmittance with faster version --- indra/llinventory/llsettingssky.cpp | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'indra/llinventory/llsettingssky.cpp') diff --git a/indra/llinventory/llsettingssky.cpp b/indra/llinventory/llsettingssky.cpp index 81937dbda5..69b4a4929d 100644 --- a/indra/llinventory/llsettingssky.cpp +++ b/indra/llinventory/llsettingssky.cpp @@ -1206,6 +1206,14 @@ LLColor3 LLSettingsSky::getLightTransmittance(F32 distance) const return transmittance; } +// SL-16127: getTotalDensity() and getDensityMultiplier() call LLSettingsSky::getColor() and LLSettingsSky::getFloat() respectively which are S-L-O-W +LLColor3 LLSettingsSky::getLightTransmittanceFast( const LLColor3& total_density, const F32 density_multiplier, const F32 distance ) const +{ + // Transparency (-> density) from Beer's law + LLColor3 transmittance = componentExp(total_density * -(density_multiplier * distance)); + return transmittance; +} + // performs soft scale clip and gamma correction ala the shader implementation // scales colors down to 0 - 1 range preserving relative ratios LLColor3 LLSettingsSky::gammaCorrect(const LLColor3& in) const -- cgit v1.3