From 88adfdcee4941dbc57725c8251c3435fbca1792e Mon Sep 17 00:00:00 2001
From: RunitaiLinden <davep@lindenlab.com>
Date: Wed, 26 Apr 2023 20:47:04 -0500
Subject: DRTVWR-559 Add "No Post" mode and refactor "Scene Gamma" into
 "Brightness" for adjusting legacy gamma when probe ambiance is 0 and dynamic
 exposure when probe ambiance is not zero.

---
 .../class1/deferred/postDeferredGammaCorrect.glsl  | 31 ++++++++++------------
 .../shaders/class1/environment/srgbF.glsl          |  5 ----
 2 files changed, 14 insertions(+), 22 deletions(-)

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

diff --git a/indra/newview/app_settings/shaders/class1/deferred/postDeferredGammaCorrect.glsl b/indra/newview/app_settings/shaders/class1/deferred/postDeferredGammaCorrect.glsl
index 82d7bb9835..31cad591be 100644
--- a/indra/newview/app_settings/shaders/class1/deferred/postDeferredGammaCorrect.glsl
+++ b/indra/newview/app_settings/shaders/class1/deferred/postDeferredGammaCorrect.glsl
@@ -104,20 +104,20 @@ vec3 toneMapACES_Hill(vec3 color)
 uniform float exposure;
 uniform float gamma;
 
-vec3 legacy_adjust_post(vec3 c);
-
-vec3 toneMap(vec3 color, float gs)
+vec3 toneMap(vec3 color)
 {
+#ifndef NO_POST
     float exp_scale = texture(exposureMap, vec2(0.5,0.5)).r;
 
-    color *= exposure * exp_scale * gs;
+    color *= exposure * exp_scale;
 
     color = toneMapACES_Hill(color);
+#else
+    color *= 0.6;
+#endif
 
     color = linear_to_srgb(color);
 
-    color = legacy_adjust_post(color);
-
     return color;
 }
 
@@ -170,22 +170,19 @@ vec3 legacyGamma(vec3 color)
     return color;
 }
 
-float legacyGammaApprox()
-{
-    //TODO -- figure out how to plumb this in as a uniform
-    float c = 0.5;
-    float gc = 1.0-pow(c, gamma);
-    
-    return gc/c * gamma;
-}
-
 void main() 
 {
     //this is the one of the rare spots where diffuseRect contains linear color values (not sRGB)
     vec4 diff = texture2D(diffuseRect, vary_fragcoord);
 
-    diff.rgb = toneMap(diff.rgb, legacyGammaApprox());
-    
+    diff.rgb = toneMap(diff.rgb);
+
+#if LEGACY_GAMMA
+#ifndef NO_POST
+    diff.rgb = legacyGamma(diff.rgb);
+#endif
+#endif
+
     vec2 tc = vary_fragcoord.xy*screen_res*4.0;
     vec3 seed = (diff.rgb+vec3(1.0))*vec3(tc.xy, tc.x+tc.y);
     vec3 nz = vec3(noise(seed.rg), noise(seed.gb), noise(seed.rb));
diff --git a/indra/newview/app_settings/shaders/class1/environment/srgbF.glsl b/indra/newview/app_settings/shaders/class1/environment/srgbF.glsl
index 35f2395ef1..3817633df0 100644
--- a/indra/newview/app_settings/shaders/class1/environment/srgbF.glsl
+++ b/indra/newview/app_settings/shaders/class1/environment/srgbF.glsl
@@ -128,8 +128,3 @@ vec3 legacy_adjust_fullbright(vec3 c)
     return c / exp_scale * 1.34;
 }
 
-
-vec3 legacy_adjust_post(vec3 c)
-{
-    return c;
-}
-- 
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