SL-10856

Modify calc of sunlight to avoid clipping in gamma correct on values outside 0-1 range.

Modify shaders to put back ambient clamp tuned to be close to ambient contrib in low/mid lighting.

1 files changed, 8 insertions, 2 deletions

diff --git a/indra/llinventory/llsettingssky.cpp b/indra/llinventory/llsettingssky.cpp
index cfca2d0d78..211af6a7ae 100644
--- a/indra/llinventory/llsettingssky.cpp
+++ b/indra/llinventory/llsettingssky.cpp
@@ -32,6 +32,10 @@
 #include "llfasttimer.h"
 #include "v3colorutil.h"
 
+#if LL_WINDOWS
+#pragma optimize("", off)
+#endif
+
 //=========================================================================
 namespace
 {
@@ -1276,8 +1280,10 @@ void LLSettingsSky::calculateLightSettings() const
     LLColor3 tmpAmbient = ambient + (smear(1.f) - ambient) * cloud_shadow;
 
     //brightness of surface both sunlight and ambient
-    mSunDiffuse = gammaCorrect(componentMult(sunlight,   light_transmittance));
-    mSunAmbient = gammaCorrect(componentMult(tmpAmbient, light_transmittance));
+    // reduce range to 0 - 1 before gamma correct to prevent clipping
+    // then restore to full 0 - 3 range before storage
+    mSunDiffuse = gammaCorrect(componentMult(sunlight * 0.33333f,   light_transmittance)) * 3.0f;
+    mSunAmbient = gammaCorrect(componentMult(tmpAmbient * 0.33333f, light_transmittance)) * 3.0f;
 
     F32 moon_brightness = getIsMoonUp() ? getMoonBrightness() : 0.001f;