From 5bf60f5d9e722f6210572fd92e79e9994abd2ec1 Mon Sep 17 00:00:00 2001
From: RunitaiLinden <davep@lindenlab.com>
Date: Wed, 5 Apr 2023 16:48:34 -0500
Subject: =?UTF-8?q?SL-19538=20Followup=20--=20fix=20for=20dynamic=20exposu?=
 =?UTF-8?q?re=20having=20large=20gaps=20in=20it=E2=80=A6=20(#157)?=
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* SL-19538 Followup -- fix for dynamic exposure having large gaps in its luminance sampling.

* SL-19538 Followup -- review feedback changes.
---
 .../shaders/class1/deferred/exposureF.glsl         | 38 ++--------------------
 1 file changed, 2 insertions(+), 36 deletions(-)

(limited to 'indra/newview/app_settings/shaders/class1/deferred/exposureF.glsl')

diff --git a/indra/newview/app_settings/shaders/class1/deferred/exposureF.glsl b/indra/newview/app_settings/shaders/class1/deferred/exposureF.glsl
index 4c860cdde0..3eda2b9050 100644
--- a/indra/newview/app_settings/shaders/class1/deferred/exposureF.glsl
+++ b/indra/newview/app_settings/shaders/class1/deferred/exposureF.glsl
@@ -29,7 +29,6 @@
 
 out vec4 frag_color;
 
-uniform sampler2D diffuseRect;
 uniform sampler2D emissiveRect;
 uniform sampler2D exposureMap;
 
@@ -46,45 +45,12 @@ float lum(vec3 col)
 
 void main() 
 {
-    float step = 1.0/16.0;
+    vec2 tc = vec2(0.5,0.5);
 
-    float start = step;
-    float end = 1.0-step;
-
-    float w = 0.0;
-
-    vec3 col;
-
-    //vec2 nz = noiseVec * step * 0.5;
-
-    for (float x = start; x <= end; x += step)
-    {
-        for (float y = start; y <= end; y += step)
-        {
-            vec2 tc = vec2(x,y); // + nz;
-            vec3 c = texture(diffuseRect, tc).rgb + texture(emissiveRect, tc).rgb;
-            float L = max(lum(c), 0.25);
-
-            float d = length(vec2(0.5)-tc);
-            d = 1.0-d;
-            d *= d;
-            d *= d;
-            d *= d;
-            L *= d;
-
-            w += L;
-
-            col += c * L;
-        }
-    }
-
-    col /= w;
-
-    float L = lum(col);
+    float L = textureLod(emissiveRect, tc, 8).r;
 
     float s = clamp(dynamic_exposure_params.x/L, dynamic_exposure_params.y, dynamic_exposure_params.z);
 
-
     float prev = texture(exposureMap, vec2(0.5,0.5)).r;
 
     s = mix(prev, s, min(dt*2.0*abs(prev-s), 0.04));
-- 
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