From 76ed0860e5c6e8a8c911279ea5d42151b5813ea3 Mon Sep 17 00:00:00 2001
From: Ptolemy <ptolemy@lindenlab.com>
Date: Wed, 10 Aug 2022 14:51:06 -0700
Subject: SL-17763: PBR: Add spotlight ambiance to multiSpotLight

---
 .../shaders/class3/deferred/multiSpotLightF.glsl   | 61 ++++++++++++++++------
 1 file changed, 45 insertions(+), 16 deletions(-)

(limited to 'indra/newview/app_settings/shaders/class3/deferred')

diff --git a/indra/newview/app_settings/shaders/class3/deferred/multiSpotLightF.glsl b/indra/newview/app_settings/shaders/class3/deferred/multiSpotLightF.glsl
index 371c9d88f4..d061b3984e 100644
--- a/indra/newview/app_settings/shaders/class3/deferred/multiSpotLightF.glsl
+++ b/indra/newview/app_settings/shaders/class3/deferred/multiSpotLightF.glsl
@@ -104,6 +104,7 @@ void calcHalfVectors(vec3 lv, vec3 n, vec3 v, out vec3 h, out vec3 l, out float
 bool clipProjectedLightVars(vec3 center, vec3 pos, out float dist, out float l_dist, out vec3 lv, out vec4 proj_tc );
 vec3 getLightIntensitySpot(vec3 lightColor, float lightRange, float lightDistance, vec3 v);
 vec4 getNormalEnvIntensityFlags(vec2 screenpos, out vec3 n, out float envIntensity);
+vec3 getProjectedLightAmbiance(float amb_da, float attenuation, float lit, float nl, float noise, vec2 projected_uv);
 vec3 getProjectedLightDiffuseColor(float light_distance, vec2 projected_uv );
 vec3 getProjectedLightSpecularColor(vec3 pos, vec3 n);
 vec2 getScreenXY(vec4 clip);
@@ -185,25 +186,54 @@ void main()
         vec3 packedORM     = texture2DRect(emissiveRect, tc).rgb; // PBR linear packed Occlusion, Roughness, Metal. See: pbropaqueF.glsl
         float metal        = packedORM.b;
 
-//        if (proj_tc.x > 0.0 && proj_tc.x < 1.0
-//        &&  proj_tc.y > 0.0 && proj_tc.y < 1.0)
-        if (nl > 0.0)
+        // We need this additional test inside a light's frustum since a spotlight's ambiance can be applied
+        if (proj_tc.x > 0.0 && proj_tc.x < 1.0
+        &&  proj_tc.y > 0.0 && proj_tc.y < 1.0)
         {
-            vec3 c_diff, reflect0, reflect90;
-            float alphaRough, specWeight;
-            initMaterial( diffuse, packedORM, alphaRough, c_diff, reflect0, reflect90, specWeight );
+            float lit = 0.0;
+            float amb_da = 0.0;
 
-            dlit = getProjectedLightDiffuseColor( l_dist, proj_tc.xy );
-            slit = getProjectedLightSpecularColor( pos, n );
+            if (nl > 0.0)
+            {
+                amb_da += (nl*0.5 + 0.5) * proj_ambiance;
+                lit = nl * dist_atten;
 
-            colorDiffuse = shadow * dist_atten * nl * (dlit*0.5 + BRDFLambertian ( reflect0, reflect90, c_diff    , specWeight, vh ));
-            colorSpec    = shadow * dist_atten * nl * (slit     + BRDFSpecularGGX( reflect0, reflect90, alphaRough, specWeight, vh, nl, nv, nh ));
+                vec3 c_diff, reflect0, reflect90;
+                float alphaRough, specWeight;
+                initMaterial( diffuse, packedORM, alphaRough, c_diff, reflect0, reflect90, specWeight );
 
-  #if DEBUG_PBR_SPOT_DIFFUSE
-            colorDiffuse = dlit.rgb; colorSpec = vec3(0);
-  #endif
-  #if DEBUG_PBR_SPOT_SPECULAR
-            colorDiffuse = vec3(0); colorSpec = slit.rgb;
+                dlit = getProjectedLightDiffuseColor( l_dist, proj_tc.xy );
+                slit = getProjectedLightSpecularColor( pos, n );
+
+                colorDiffuse = shadow * lit * (dlit*0.5 + BRDFLambertian ( reflect0, reflect90, c_diff    , specWeight, vh ));
+                colorSpec    = shadow * lit * (slit     + BRDFSpecularGGX( reflect0, reflect90, alphaRough, specWeight, vh, nl, nv, nh ));
+
+      #if DEBUG_PBR_SPOT_DIFFUSE
+                colorDiffuse = dlit.rgb; colorSpec = vec3(0);
+      #endif
+      #if DEBUG_PBR_SPOT_SPECULAR
+                colorDiffuse = vec3(0); colorSpec = slit.rgb;
+      #endif
+      #if DEBUG_PBR_SPOT
+                colorDiffuse = dlit; colorSpec = vec3(0);
+                colorDiffuse *= nl;
+                colorDiffuse *= shadow;
+      #endif
+
+      #if DEBUG_SPOT_SPEC_POS
+                colorDiffuse = pos + ref * dot(pdelta, proj_n)/ds; colorSpec = vec3(0);
+      #endif
+      #if DEBUG_SPOT_REFLECTION
+                colorDiffuse = ref; colorSpec = vec3(0);
+      #endif
+
+            }
+
+            vec3 amb_rgb = getProjectedLightAmbiance( amb_da, dist_atten, lit, nl, 1.0, proj_tc.xy );
+            colorDiffuse += diffuse.rgb * amb_rgb;
+
+  #if DEBUG_LIGHT_FRUSTUM
+            colorDiffuse = vec3(0,1,0); colorSpec = vec3(0);
   #endif
   #if DEBUG_PBR_SPOT
             colorDiffuse = dlit; colorSpec = vec3(0);
@@ -217,7 +247,6 @@ void main()
   #if DEBUG_SPOT_REFLECTION
             colorDiffuse = ref; colorSpec = vec3(0);
   #endif
-
         }
 
   #if DEBUG_SPOT_DIFFUSE
-- 
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