WIP - Windlight sun lighting should happen in sRGB space, not linear space. ...

WIP - Windlight sun lighting should happen in sRGB space, not linear space.  This keeps ambient from getting overblown and better matches environment lighting with ALM on/off.

indra/newview/app_settings/shaders/class1/deferred/alphaF.glsl

@@ -251,7 +251,7 @@ vec3 post_ambient = color.rgb;
 
 vec3 post_sunlight = color.rgb;
 
-    color.rgb *= diffuse_linear.rgb;
+    color.rgb *= diffuse_srgb.rgb;
 
 vec3 post_diffuse = color.rgb;
 
@@ -261,6 +261,11 @@ vec3 post_atmo = color.rgb;
 
     vec4 light = vec4(0,0,0,0);
     
+    color.rgb = scaleSoftClipFrag(color.rgb);
+    
+    //convert to linear before applying local lights
+    color.rgb = srgb_to_linear(color.rgb);
+
    #define LIGHT_LOOP(i) light.rgb += calcPointLightOrSpotLight(light_diffuse[i].rgb, diffuse_linear.rgb, pos.xyz, norm, light_position[i], light_direction[i].xyz, light_attenuation[i].x, light_attenuation[i].y, light_attenuation[i].z, light_attenuation[i].w);
 
     LIGHT_LOOP(1)
@@ -275,9 +280,6 @@ vec3 post_atmo = color.rgb;
 #if !defined(LOCAL_LIGHT_KILL)
     color.rgb += light.rgb;
 #endif
-
-    color.rgb = scaleSoftClipFrag(color.rgb);
-
     // back to sRGB as we're going directly to the final RT post-deferred gamma correction
     color.rgb = linear_to_srgb(color.rgb);
 

indra/newview/app_settings/shaders/class1/deferred/materialF.glsl

@@ -117,7 +117,7 @@ vec3 calcPointLightOrSpotLight(vec3 light_col, vec3 npos, vec3 diffuse, vec4 spe
         // spotlight coefficient.
         float spot = max(dot(-ln, lv), is_pointlight);
         da *= spot*spot; // GL_SPOT_EXPONENT=2
-
+    
         //angular attenuation
         da *= dot(n, lv);
 
@@ -215,8 +215,7 @@ void main()
 
     vec4 diffuse_tap = texture2D(diffuseMap, vary_texcoord0.xy);
     diffuse_tap.rgb *= vertex_color.rgb;
-    //diffuse_tap = vec4(1,1,1,1);
-
+    
 //#if (DIFFUSE_ALPHA_MODE == DIFFUSE_ALPHA_MODE_BLEND)
     vec4 diffuse_srgb = diffuse_tap;
     vec4 diffuse_linear = vec4(srgb_to_linear(diffuse_srgb.rgb), diffuse_srgb.a);
@@ -349,7 +348,7 @@ void main()
         color.rgb += sun_contrib;
 #endif
 
-        color.rgb *= diffuse_linear.rgb;
+        color.rgb *= diffuse_srgb.rgb;
         
         float glare = 0.0;
 
@@ -397,11 +396,15 @@ void main()
         }
 
         color = atmosFragLighting(color, additive, atten);
+        color = scaleSoftClipFrag(color);
 
         vec3 npos = normalize(-pos.xyz);
 
         vec3 light = vec3(0,0,0);
 
+        //convert to linear before adding local lights
+        color.rgb = srgb_to_linear(color.rgb);
+
 #define LIGHT_LOOP(i) light.rgb += calcPointLightOrSpotLight(light_diffuse[i].rgb, npos, diffuse_linear.rgb, final_specular, pos.xyz, norm, light_position[i], light_direction[i].xyz, light_attenuation[i].x, light_attenuation[i].y, light_attenuation[i].z, glare, light_attenuation[i].w );
 
             LIGHT_LOOP(1)
@@ -419,8 +422,9 @@ void main()
         color.rgb += light.rgb;
 #endif
 
-        color = scaleSoftClipFrag(color);
-
+//convert to srgb as this color is being written post gamma correction
+    color.rgb = linear_to_srgb(color.rgb);
+   
 #ifdef WATER_FOG
         vec4 temp = applyWaterFogView(pos, vec4(color.rgb, al));
         color.rgb = temp.rgb;
@@ -429,8 +433,6 @@ void main()
     }
 
     
-    color.rgb = linear_to_srgb(color.rgb);
-   
     frag_color = vec4(color, al);
 
 #else // mode is not DIFFUSE_ALPHA_MODE_BLEND, encode to gbuffer 

indra/newview/app_settings/shaders/class1/deferred/multiSpotLightF.glsl

@@ -163,15 +163,19 @@ void main()
 	proj_tc.xyz /= proj_tc.w;
 	
 	float fa = falloff+1.0;
-	float dist_atten = min(1.0-(dist-1.0*(1.0-fa))/fa, 1.0);
+	float dist_atten = clamp(1.0-(dist-1.0*(1.0-fa))/fa, 0.0, 1.0);
 	dist_atten *= dist_atten;
 	dist_atten *= 2.0;
+	
 
 	if (dist_atten <= 0.0)
 	{
 		discard;
 	}
 	
+	float noise = texture2D(noiseMap, frag.xy/128.0).b;
+	dist_atten *= noise;
+
 	lv = proj_origin-pos.xyz;
 	lv = normalize(lv);
 	float da = dot(norm, lv);
@@ -179,12 +183,13 @@ void main()
 		
 	vec3 diff_tex = texture2DRect(diffuseRect, frag.xy).rgb;
     // SL-12005 Projector light pops as we get closer, more objectionable than being in wrong color space.
-    //          We can't switch to linear here unless we do it everywhere
-    //diff_tex.rgb = srgb_to_linear(diff_tex.rgb);
+    //          We can't switch to linear here unless we do it everywhere*
+	// *gbuffer is sRGB, convert to linear whenever sampling from it
+    diff_tex.rgb = srgb_to_linear(diff_tex.rgb);
 
 	vec3 dlit = vec3(0, 0, 0);
 	
-	float noise = texture2D(noiseMap, frag.xy/128.0).b;
+	
 	if (proj_tc.z > 0.0 &&
 		proj_tc.x < 1.0 &&
 		proj_tc.y < 1.0 &&
@@ -203,7 +208,7 @@ void main()
 		
 			dlit = color.rgb * plcol.rgb * plcol.a;
 			
-			lit = da * dist_atten * noise;
+			lit = da * dist_atten;
 			
 			col = dlit*lit*diff_tex;
 			amb_da += (da*0.5)*proj_ambiance;
@@ -245,7 +250,7 @@ void main()
 			col += dlit*scol*spec.rgb;
 			//col += spec.rgb;
 		}
-	}	
+	}
 
 	if (envIntensity > 0.0)
 	{
@@ -277,6 +282,7 @@ void main()
 	}
 #endif
 
+	//output linear, sum of lights will be gamma corrected later	
 	frag_color.rgb = col;	
 	frag_color.a = 0.0;
 }

indra/newview/app_settings/shaders/class1/deferred/postDeferredGammaCorrect.glsl

@@ -43,6 +43,7 @@ vec3 linear_to_srgb(vec3 cl);
 
 void main() 
 {
+    //this is the one of the rare spots where diffuseRect contains linear color values (not sRGB)
     vec4 diff = texture2DRect(diffuseRect, vary_fragcoord);
     //diff.rgb = pow(diff.rgb, vec3(display_gamma));
     diff.rgb = linear_to_srgb(diff.rgb);

indra/newview/app_settings/shaders/class1/deferred/softenLightF.glsl

@@ -119,7 +119,7 @@ vec3 post_ambient = color.rgb;
 
 vec3 post_sunlight = color.rgb;
 
-        color.rgb *= diffuse_linear.rgb;
+        color.rgb *= diffuse_srgb.rgb;
 
 vec3 post_diffuse = color.rgb;
 
@@ -199,9 +199,6 @@ vec3 post_atmo = color.rgb;
 //color.rgb = post_env;
 //color.rgb = post_atmo;
 
-// convert to linear as fullscreen lights need to sum in linear colorspace
-// and will be gamma (re)corrected downstream...
-        //color.rgb = srgb_to_linear(color.rgb);
     }
 
 // linear debuggables
@@ -209,7 +206,9 @@ vec3 post_atmo = color.rgb;
 //color.rgb = vec3(ambient);
 //color.rgb = vec3(scol);
 //color.rgb = diffuse_linear.rgb;
-    
-    frag_color.rgb = color.rgb;
+
+    // convert to linear as fullscreen lights need to sum in linear colorspace
+    // and will be gamma (re)corrected downstream...
+    frag_color.rgb = srgb_to_linear(color.rgb);
     frag_color.a = 0.0; //bloom;
 }

indra/newview/app_settings/shaders/class1/windlight/atmosphericsFuncs.glsl

@@ -46,6 +46,7 @@ float getAmbientClamp()
     return 1.0f;
 }
 
+
 void calcAtmosphericVars(vec3 inPositionEye, vec3 light_dir, float ambFactor, out vec3 sunlit, out vec3 amblit, out vec3 additive, out vec3 atten, bool use_ao) {
 
     vec3 P = inPositionEye;
@@ -123,7 +124,7 @@ void calcAtmosphericVars(vec3 inPositionEye, vec3 light_dir, float ambFactor, ou
     temp2.x *= sun_moon_glow_factor;
  
     vec4 amb_color = ambient_color; 
-
+    
     //increase ambient when there are more clouds
     vec4 tmpAmbient = amb_color + (vec4(1.) - amb_color) * cloud_shadow * 0.5;
     

indra/newview/app_settings/shaders/class2/deferred/multiSpotLightF.glsl

@@ -192,8 +192,9 @@ void main()
         
     vec3 diff_tex = texture2DRect(diffuseRect, frag.xy).rgb;
     // SL-12005 Projector light pops as we get closer, more objectionable than being in wrong color space.
-    //          We can't switch to linear here unless we do it everywhere
-    //diff_tex.rgb = srgb_to_linear(diff_tex.rgb);
+    //          We can't switch to linear here unless we do it everywhere*
+    // *gbuffer IS sRGB, convert to linear since this shader outputs linear
+    diff_tex.rgb = srgb_to_linear(diff_tex.rgb);
  
     vec4 spec = texture2DRect(specularRect, frag.xy);
 
@@ -296,6 +297,7 @@ void main()
     //not sure why, but this line prevents MATBUG-194
     col = max(col, vec3(0.0));
 
-    frag_color.rgb = col;   
+    //output linear
+    frag_color.rgb = col;
     frag_color.a = 0.0;
 }

indra/newview/app_settings/shaders/class2/deferred/softenLightF.glsl

@@ -106,7 +106,7 @@ void main()
         vec3 atten;
     
         calcAtmosphericVars(pos.xyz, light_dir, ambocc, sunlit, amblit, additive, atten, true);
-
+        
         float ambient = da;
         ambient *= 0.5;
         ambient *= ambient;
@@ -127,7 +127,7 @@ vec3 post_ambient = color.rgb;
 
 vec3 post_sunlight = color.rgb;
 
-        color.rgb *= diffuse_linear.rgb;
+        color.rgb *= diffuse_srgb.rgb;
 
 vec3 post_diffuse = color.rgb;
 
@@ -218,6 +218,6 @@ vec3 post_atmo = color.rgb;
 
         //output linear RGB as lights are summed up in linear space and then gamma corrected prior to the 
         //post deferred passes
-    frag_color.rgb = color.rgb;
+    frag_color.rgb = srgb_to_linear(color.rgb);
     frag_color.a = bloom;
 }

indra/newview/app_settings/shaders/class2/deferred/spotLightF.glsl

@@ -189,7 +189,7 @@ void main()
 	lv = normalize(lv);
 	float da = dot(norm, lv);
 		
-	vec3 diff_tex = texture2DRect(diffuseRect, frag.xy).rgb;
+	vec3 diff_tex = srgb_to_linear(texture2DRect(diffuseRect, frag.xy).rgb);
 	vec4 spec = texture2DRect(specularRect, frag.xy);
 	vec3 dlit = vec3(0, 0, 0);
 
@@ -287,6 +287,7 @@ void main()
 	//not sure why, but this line prevents MATBUG-194
 	col = max(col, vec3(0.0));
 
+	//output linear colors as gamma correction happens down stream
 	frag_color.rgb = col;	
 	frag_color.a = 0.0;
 }

indra/newview/app_settings/shaders/class3/deferred/multiSpotLightF.glsl

@@ -183,7 +183,7 @@ void main()
 
     vec3 col = vec3(0,0,0);
         
-    vec3 diff_tex = texture2DRect(diffuseRect, frag.xy).rgb;
+    vec3 diff_tex = srgb_to_linear(texture2DRect(diffuseRect, frag.xy).rgb);
     
     vec4 spec = texture2DRect(specularRect, frag.xy);
 
@@ -285,6 +285,7 @@ void main()
 
     col = scaleDownLight(col);
 
+    //output linear space color as gamma correction happens down stream
     frag_color.rgb = col;   
     frag_color.a = 0.0;
 }

indra/newview/app_settings/shaders/class3/deferred/softenLightF.glsl

@@ -94,7 +94,8 @@ void main()
 
     float da = max(dot(norm.xyz, sun_dir.xyz), 0.0);
 
-    vec4 diffuse = texture2DRect(diffuseRect, tc); // linear
+    vec4 diffuse = texture2DRect(diffuseRect, tc); // sRGB
+    diffuse.rgb = srgb_to_linear(diffuse.rgb);
 
     vec3 col;
     float bloom = 0.0;
@@ -169,7 +170,8 @@ void main()
             bloom = fogged.a;
         #endif
     }
-    
+
+    //output linear since gamma correction happens down stream
     frag_color.rgb = col;
     frag_color.a = bloom;
 }

indra/newview/app_settings/shaders/class3/deferred/spotLightF.glsl

@@ -182,7 +182,7 @@ void main()
         
     vec3 col = vec3(0,0,0);
         
-    vec3 diff_tex = texture2DRect(diffuseRect, frag.xy).rgb;
+    vec3 diff_tex = srgb_to_linear(texture2DRect(diffuseRect, frag.xy).rgb);
         
     vec4 spec = texture2DRect(specularRect, frag.xy);