From 50ec54831de88926ca13c9a72d89006ceda6c355 Mon Sep 17 00:00:00 2001
From: RunitaiLinden <davep@lindenlab.com>
Date: Thu, 1 Jun 2023 19:49:23 -0500
Subject: DRTVWR-559 Revert skies to be very close to release and disable tone
 mapping when probe ambiance is zero.

Hack for desaturating legacy materials has been removed for performance and quality reasons.

Adds a new setting for auto adjusting legacy skies.  This is the PBR "opt out" button.  If disabled, legacy skies will disable tonemapping, automatic probe ambiance, and HDR/exposure.  If enabled, legacy skies will behave as if probe ambiance and HDR scale are 1.0, and ambient will be cut in half.

HDR scale will act as a sky brightener, but will automatically adjust dynamic exposure so the sky will be properly exposed.  If you want relatively even exposure all the time, set HDR Scale to 1.0.  If you want a high range of exposures between indoor/dark areas and outdoor/bright areas, increase HDR Scale.

Also tuned up SSAO (thanks Rye!).

Reviewed with Brad.
---
 .../shaders/class1/windlight/atmosphericsV.glsl    | 56 ++++++++++++++++++++++
 1 file changed, 56 insertions(+)
 create mode 100644 indra/newview/app_settings/shaders/class1/windlight/atmosphericsV.glsl

(limited to 'indra/newview/app_settings/shaders/class1/windlight/atmosphericsV.glsl')

diff --git a/indra/newview/app_settings/shaders/class1/windlight/atmosphericsV.glsl b/indra/newview/app_settings/shaders/class1/windlight/atmosphericsV.glsl
new file mode 100644
index 0000000000..cc3617ba61
--- /dev/null
+++ b/indra/newview/app_settings/shaders/class1/windlight/atmosphericsV.glsl
@@ -0,0 +1,56 @@
+/**
+ * @file class2\wl\atmosphericsV.glsl
+ *
+ * $LicenseInfo:firstyear=2005&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2005, 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
+ * $/LicenseInfo$
+ */
+
+// out param funcs
+
+
+uniform vec3 sun_dir;
+uniform vec3 moon_dir;
+uniform int sun_up_factor;
+
+void setSunlitColor(vec3 v);
+void setAmblitColor(vec3 v);
+void setAdditiveColor(vec3 v);
+void setAtmosAttenuation(vec3 v);
+void setPositionEye(vec3 v);
+
+vec3 getAdditiveColor();
+
+void calcAtmosphericVars(vec3 inPositionEye, vec3 light_dir, float ambFactor, out vec3 sunlit, out vec3 amblit, out vec3 additive, out vec3 atten);
+
+void calcAtmospherics(vec3 inPositionEye) {
+    vec3 P = inPositionEye;
+    setPositionEye(P);
+    vec3 tmpsunlit = vec3(1);
+    vec3 tmpamblit = vec3(1);
+    vec3 tmpaddlit = vec3(1);
+    vec3 tmpattenlit = vec3(1);
+	vec3 light_dir = (sun_up_factor == 1) ? sun_dir : moon_dir;	
+    calcAtmosphericVars(inPositionEye, light_dir, 1, tmpsunlit, tmpamblit, tmpaddlit, tmpattenlit);
+    setSunlitColor(tmpsunlit);
+    setAmblitColor(tmpamblit);
+    setAdditiveColor(tmpaddlit);
+    setAtmosAttenuation(tmpattenlit);
+}
-- 
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