From d65fb7cec8ce36ce7f6ff082f8d04bdd8bc0208c Mon Sep 17 00:00:00 2001
From: "Jonathan \"Geenz\" Goodman" <geenz@lindenlab.com>
Date: Mon, 25 Nov 2024 20:56:03 -0500
Subject: Drop emissive on old Intel GPUs (#3110)

* #3103 Add the ability to disable the emissive buffer for older GPUs with low memory bandwidth.
* #3135 Add a "vintage" mode for slower GPUs
* #2719 Fix for skies being overbrightened
* #2632 Do not apply tonemapping on legacy skies
---
 .../shaders/class1/windlight/atmosphericsFuncs.glsl       | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

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

diff --git a/indra/newview/app_settings/shaders/class1/windlight/atmosphericsFuncs.glsl b/indra/newview/app_settings/shaders/class1/windlight/atmosphericsFuncs.glsl
index 359bfe8253..205d4bff6d 100644
--- a/indra/newview/app_settings/shaders/class1/windlight/atmosphericsFuncs.glsl
+++ b/indra/newview/app_settings/shaders/class1/windlight/atmosphericsFuncs.glsl
@@ -41,6 +41,7 @@ uniform float scene_light_strength;
 uniform float sun_moon_glow_factor;
 uniform float sky_sunlight_scale;
 uniform float sky_ambient_scale;
+uniform int classic_mode;
 
 float getAmbientClamp() { return 1.0f; }
 
@@ -121,7 +122,7 @@ void calcAtmosphericVars(vec3 inPositionEye, vec3 light_dir, float ambFactor, ou
     // brightness of surface both sunlight and ambient
 
     sunlit = sunlight.rgb;
-    amblit = tmpAmbient;
+    amblit = pow(tmpAmbient.rgb, vec3(0.9)) * 0.57;
 
     additive *= vec3(1.0 - combined_haze);
 
@@ -142,18 +143,22 @@ float ambientLighting(vec3 norm, vec3 light_dir)
     return ambient;
 }
 
-
 // return lit amblit in linear space, leave sunlit and additive in sRGB space
 void calcAtmosphericVarsLinear(vec3 inPositionEye, vec3 norm, vec3 light_dir, out vec3 sunlit, out vec3 amblit, out vec3 additive,
                          out vec3 atten)
 {
     calcAtmosphericVars(inPositionEye, light_dir, 1.0, sunlit, amblit, additive, atten);
 
+    amblit *= ambientLighting(norm, light_dir);
+
+    if (classic_mode < 1)
+    {
+        amblit = srgb_to_linear(amblit);
+        sunlit = srgb_to_linear(sunlit);
+    }
+
     // multiply to get similar colors as when the "scaleSoftClip" implementation was doubling color values
     // (allows for mixing of light sources other than sunlight e.g. reflection probes)
     sunlit *= sky_sunlight_scale;
     amblit *= sky_ambient_scale;
-
-    amblit = srgb_to_linear(amblit);
-    amblit *= ambientLighting(norm, light_dir);
 }
-- 
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