From 4f267a5723e7da2de36b9f2295e4942a4c8bf6c5 Mon Sep 17 00:00:00 2001
From: Graham Linden <graham@lindenlab.com>
Date: Thu, 1 Nov 2018 20:28:47 +0100
Subject: SL-9994

Make shaders use consistent naming and parameter order for transport and atmospheric helpers.

Share transport and gamma correction code where possible.

Add lots of asserts and other validation for when things don't go as planned.

Engage dumpShaderSource to get more source output with shader compilation fail.
---
 .../shaders/class2/deferred/softenLightF.glsl      | 67 ++++++++++++++--------
 1 file changed, 43 insertions(+), 24 deletions(-)

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

diff --git a/indra/newview/app_settings/shaders/class2/deferred/softenLightF.glsl b/indra/newview/app_settings/shaders/class2/deferred/softenLightF.glsl
index af199fd78c..fa81317f3f 100644
--- a/indra/newview/app_settings/shaders/class2/deferred/softenLightF.glsl
+++ b/indra/newview/app_settings/shaders/class2/deferred/softenLightF.glsl
@@ -1,5 +1,5 @@
 /** 
- * @file softenLightF.glsl
+ * @file class2/deferred/softenLightF.glsl
  *
  * $LicenseInfo:firstyear=2007&license=viewerlgpl$
  * Second Life Viewer Source Code
@@ -72,17 +72,43 @@ VARYING vec2 vary_fragcoord;
 uniform mat4 inv_proj;
 uniform vec2 screen_res;
 
+uniform int no_atmo;
+
 vec3 srgb_to_linear(vec3 cs);
 vec3 linear_to_srgb(vec3 cl);
 vec3 decode_normal (vec2 enc);
 
-vec3 atmosFragAmbient(vec3 l, vec3 ambient);
-vec3 atmosFragLighting(vec3 l, vec3 additive, vec3 atten);
-vec3 scaleFragSoftClip(vec3 l);
-vec3 atmosFragAffectDirectionalLight(float intensity, vec3 sunlit);
 void calcFragAtmospherics(vec3 inPositionEye, float ambFactor, out vec3 sunlit, out vec3 amblit, out vec3 additive, out vec3 atten);
-vec3 fullbrightFragAtmosTransport(vec3 l, vec3 additive, vec3 atten);
-vec3 fullbrightScaleSoftClipFrag(vec3 l, vec3 atten);
+vec3 atmosFragLighting(vec3 l, vec3 additive, vec3 atten);
+vec3 fullbrightScaleSoftClipFrag(vec3 l);
+vec3 scaleSoftClipFrag(vec3 l);
+
+vec3 atmosTransportFrag(vec3 light, vec3 additive, vec3 atten) {
+    if (no_atmo == 0)
+    {
+	    light *= atten.r;
+	    light += additive * 2.0;
+    }
+	return light;
+}
+
+vec3 fullbrightAtmosTransportFrag(vec3 light, vec3 additive, vec3 atten) {
+    if (no_atmo == 1)
+    {
+        return light;
+    }
+	float brightness = dot(light.rgb, vec3(0.33333));
+	return mix(atmosTransportFrag(light.rgb, additive, atten), light.rgb + additive.rgb, brightness * brightness);
+}
+
+vec3 fullbrightShinyAtmosTransportFrag(vec3 light, vec3 additive, vec3 atten) {
+    if (no_atmo == 1)
+    {
+        return light;
+    }
+	float brightness = dot(light.rgb, vec3(0.33333));
+	return mix(atmosTransportFrag(light.rgb, additive, atten), (light.rgb + additive.rgb) * (2.0 - brightness), brightness * brightness);
+}
 
 vec4 getPosition_d(vec2 pos_screen, float depth)
 {
@@ -121,7 +147,6 @@ void main()
 	float light_gamma = 1.0/1.3;
 	da = pow(da, light_gamma);
 
-
 	vec4 diffuse = texture2DRect(diffuseRect, tc);
 
 	//convert to gamma space
@@ -136,27 +161,23 @@ void main()
 		scol_ambocc = pow(scol_ambocc, vec2(light_gamma));
 
 		float scol = max(scol_ambocc.r, diffuse.a); 
-
-		
-
 		float ambocc = scol_ambocc.g;
 
-                vec3 sunlit;
-                vec3 amblit;
-                vec3 additive;
-                vec3 atten;
+        vec3 sunlit;
+        vec3 amblit;
+        vec3 additive;
+        vec3 atten;
 	
 		calcFragAtmospherics(pos.xyz, ambocc, sunlit, amblit, additive, atten);
-	
-		col = atmosFragAmbient(vec3(0), amblit);
+
 		float ambient = min(abs(dot(norm.xyz, sun_dir.xyz)), 1.0);
 		ambient *= 0.5;
 		ambient *= ambient;
 		ambient = (1.0-ambient);
 
-		col.rgb *= ambient;
+		col.rgb = ambient * amblit;
 
-		col += atmosFragAffectDirectionalLight(max(min(da, scol), 0.0), sunlit);
+		col += sunlit * max(min(da, scol), 0.0);
 	
 		col *= diffuse.rgb;
 	
@@ -173,7 +194,6 @@ void main()
 			bloom = dot(spec_contrib, spec_contrib) / 6;
 			col += spec_contrib;
 		}
-	
 		
 		col = mix(col, diffuse.rgb, diffuse.a);
 
@@ -186,13 +206,12 @@ void main()
 						
 		if (norm.w < 0.5)
 		{
-            vec3 add = additive;
-			col = mix(atmosFragLighting(col, add, atten), fullbrightFragAtmosTransport(col, atten, add), diffuse.a);
-			col = mix(scaleFragSoftClip(col), fullbrightScaleSoftClipFrag(col, atten), diffuse.a);
+			col = mix(atmosFragLighting(col, additive, atten), fullbrightAtmosTransportFrag(col, additive, atten), diffuse.a);
+			col = mix(scaleSoftClipFrag(col), fullbrightScaleSoftClipFrag(col), diffuse.a);
 		}
 
 		#ifdef WATER_FOG
-			vec4 fogged = applyWaterFogView(pos,vec4(col, bloom));
+			vec4 fogged = applyWaterFogView(pos.xyz,vec4(col, bloom));
 			col = fogged.rgb;
 			bloom = fogged.a;
 		#endif
-- 
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