From 7d426815019ac5394e5821f1c6ba374e12606aaa Mon Sep 17 00:00:00 2001
From: Dave Parks <davep@lindenlab.com>
Date: Fri, 30 Sep 2022 10:57:01 -0500
Subject: SL-18239 Unify PBR and non-PBR treatment of ambient/SSAO/irradiance. 
 Restore SSAO to release version.

---
 .../app_settings/shaders/class2/deferred/alphaF.glsl  | 16 +++++-----------
 .../shaders/class2/deferred/pbralphaF.glsl            | 19 ++++++++-----------
 2 files changed, 13 insertions(+), 22 deletions(-)

(limited to 'indra/newview/app_settings/shaders/class2/deferred')

diff --git a/indra/newview/app_settings/shaders/class2/deferred/alphaF.glsl b/indra/newview/app_settings/shaders/class2/deferred/alphaF.glsl
index 39aec699fe..b4406aabc0 100644
--- a/indra/newview/app_settings/shaders/class2/deferred/alphaF.glsl
+++ b/indra/newview/app_settings/shaders/class2/deferred/alphaF.glsl
@@ -80,7 +80,7 @@ vec2 encode_normal (vec3 n);
 vec3 scaleSoftClipFragLinear(vec3 l);
 vec3 atmosFragLightingLinear(vec3 light, vec3 additive, vec3 atten);
 
-void calcAtmosphericVarsLinear(vec3 inPositionEye, vec3 light_dir, float ambFactor, out vec3 sunlit, out vec3 amblit, out vec3 atten, out vec3 additive, bool use_ao);
+void calcAtmosphericVarsLinear(vec3 inPositionEye, vec3 norm, vec3 light_dir, out vec3 sunlit, out vec3 amblit, out vec3 atten, out vec3 additive);
 
 #ifdef HAS_SHADOW
 float sampleDirectionalShadow(vec3 pos, vec3 norm, vec2 pos_screen);
@@ -243,12 +243,12 @@ void main()
     vec3 additive;
     vec3 atten;
 
-    calcAtmosphericVarsLinear(pos.xyz, light_dir, 1.0, sunlit, amblit, additive, atten, false);
+    calcAtmosphericVarsLinear(pos.xyz, norm, light_dir, sunlit, amblit, additive, atten);
 
-    vec3 ambenv;
+    vec3 irradiance;
     vec3 glossenv;
     vec3 legacyenv;
-    sampleReflectionProbesLegacy(ambenv, glossenv, legacyenv, pos.xyz, norm.xyz, 0.0, 0.0);
+    sampleReflectionProbesLegacy(irradiance, glossenv, legacyenv, pos.xyz, norm.xyz, 0.0, 0.0);
     
 
     float da = dot(norm.xyz, light_dir.xyz);
@@ -261,15 +261,9 @@ void main()
 
     color.a   = final_alpha;
 
-    float ambient = min(abs(dot(norm.xyz, sun_dir.xyz)), 1.0);
-    ambient *= 0.5;
-    ambient *= ambient;
-    ambient = (1.0 - ambient);
-
     vec3 sun_contrib = min(final_da, shadow) * sunlit;
 
-    color.rgb = max(amblit, ambenv);
-    color.rgb *= ambient;
+    color.rgb = max(amblit, irradiance);
 
     color.rgb += sun_contrib;
 
diff --git a/indra/newview/app_settings/shaders/class2/deferred/pbralphaF.glsl b/indra/newview/app_settings/shaders/class2/deferred/pbralphaF.glsl
index 13544af0b1..9bbc4f87bf 100644
--- a/indra/newview/app_settings/shaders/class2/deferred/pbralphaF.glsl
+++ b/indra/newview/app_settings/shaders/class2/deferred/pbralphaF.glsl
@@ -74,8 +74,7 @@ uniform vec2 light_deferred_attenuation[8]; // light size and falloff
 vec3 srgb_to_linear(vec3 c);
 vec3 linear_to_srgb(vec3 c);
 
-// These are in deferredUtil.glsl but we can't set: mFeatures.isDeferred to include it
-void calcAtmosphericVarsLinear(vec3 inPositionEye, vec3 light_dir, float ambFactor, out vec3 sunlit, out vec3 amblit, out vec3 additive, out vec3 atten, bool use_ao);
+void calcAtmosphericVarsLinear(vec3 inPositionEye, vec3 norm, vec3 light_dir, out vec3 sunlit, out vec3 amblit, out vec3 atten, out vec3 additive);
 vec3 atmosFragLightingLinear(vec3 light, vec3 additive, vec3 atten);
 vec3 scaleSoftClipFragLinear(vec3 l);
 
@@ -140,15 +139,6 @@ void main()
     vec3  light_dir   = (sun_up_factor == 1) ? sun_dir : moon_dir;
     vec3  pos         = vary_position;
 
-    float scol = 1.0;
-    float ambocc = 1.0;
-
-    vec3 sunlit;
-    vec3 amblit;
-    vec3 additive;
-    vec3 atten;
-    calcAtmosphericVarsLinear(pos.xyz, light_dir, ambocc, sunlit, amblit, additive, atten, true);
-
 
 // IF .mFeatures.mIndexedTextureChannels = LLGLSLShader::sIndexedTextureChannels;
 //    vec3 col = vertex_color.rgb * diffuseLookup(vary_texcoord0.xy).rgb;
@@ -174,6 +164,13 @@ void main()
 
     norm *= gl_FrontFacing ? 1.0 : -1.0;
 
+    float scol = 1.0;
+    vec3 sunlit;
+    vec3 amblit;
+    vec3 additive;
+    vec3 atten;
+    calcAtmosphericVarsLinear(pos.xyz, norm, light_dir, sunlit, amblit, additive, atten);
+
 #ifdef HAS_SHADOW
     vec2 frag = vary_fragcoord.xy/vary_fragcoord.z*0.5+0.5;
     frag *= screen_res;
-- 
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