Re-added RGB10_A2 normal buffer, this time encoded with a sphere map transform so we can store the environment intensity in the blue channel.

19 files changed, 154 insertions, 29 deletions

diff --git a/indra/newview/app_settings/shaders/class1/deferred/alphaF.glsl b/indra/newview/app_settings/shaders/class1/deferred/alphaF.glsl
index abf8da051c..4ef69824a1 100644
--- a/indra/newview/app_settings/shaders/class1/deferred/alphaF.glsl
+++ b/indra/newview/app_settings/shaders/class1/deferred/alphaF.glsl
@@ -62,7 +62,7 @@ uniform float shadow_offset;
 
 float calcDirectionalLight(vec3 n, vec3 l)
 {
-        float a = pow(max(dot(n,l),0.0), 0.6);
+        float a = pow(max(dot(n,l),0.0), 0.7);
         return a;
 }
 
@@ -90,7 +90,7 @@ float calcPointLightOrSpotLight(vec3 v, vec3 n, vec4 lp, vec3 ln, float la, floa
 		da *= spot*spot; // GL_SPOT_EXPONENT=2
 
 		//angular attenuation
-		da *= max(pow(dot(n, lv), 0.6), 0.0);		
+		da *= max(pow(dot(n, lv), 0.7), 0.0);		
 	}
 
 	return da;	
@@ -120,7 +120,7 @@ void main()
 		light_col += light_diffuse[i].rgb * calcPointLightOrSpotLight(pos.xyz, vary_norm, light_position[i], light_direction[i], light_attenuation[i].x, light_attenuation[i].y, light_attenuation[i].z);
 	}
 	
-	color.rgb += vary_pointlight_col * light_col;
+	color.rgb += diff.rgb * vary_pointlight_col * light_col;
 
 	frag_color = color;
 }
diff --git a/indra/newview/app_settings/shaders/class1/deferred/alphaNonIndexedF.glsl b/indra/newview/app_settings/shaders/class1/deferred/alphaNonIndexedF.glsl
index a0a79bada6..10e9670894 100644
--- a/indra/newview/app_settings/shaders/class1/deferred/alphaNonIndexedF.glsl
+++ b/indra/newview/app_settings/shaders/class1/deferred/alphaNonIndexedF.glsl
@@ -58,7 +58,7 @@ uniform vec3 light_diffuse[8];
 
 float calcDirectionalLight(vec3 n, vec3 l)
 {
-        float a = pow(max(dot(n,l),0.0), 0.6);
+        float a = pow(max(dot(n,l),0.0), 0.7);
         return a;
 }
 
@@ -86,7 +86,7 @@ float calcPointLightOrSpotLight(vec3 v, vec3 n, vec4 lp, vec3 ln, float la, floa
 		da *= spot*spot; // GL_SPOT_EXPONENT=2
 
 		//angular attenuation
-		da *= max(pow(dot(n, lv), 0.6), 0.0);		
+		da *= max(pow(dot(n, lv), 0.7), 0.0);		
 	}
 
 	return da;	
@@ -129,7 +129,7 @@ void main()
 		light_col += light_diffuse[i].rgb * calcPointLightOrSpotLight(pos.xyz, vary_norm, light_position[i], light_direction[i], light_attenuation[i].x, light_attenuation[i].y, light_attenuation[i].z);
 	}
 	
-	color.rgb += vary_pointlight_col * light_col;
+	color.rgb += diff.rgb * vary_pointlight_col * light_col;
 
 	frag_color = color;
 	//frag_color = vec4(1,0,1,1);
diff --git a/indra/newview/app_settings/shaders/class1/deferred/avatarF.glsl b/indra/newview/app_settings/shaders/class1/deferred/avatarF.glsl
index bfd9b9b3eb..bcccbf77d2 100644
--- a/indra/newview/app_settings/shaders/class1/deferred/avatarF.glsl
+++ b/indra/newview/app_settings/shaders/class1/deferred/avatarF.glsl
@@ -34,6 +34,12 @@ uniform sampler2D diffuseMap;
 VARYING vec3 vary_normal;
 VARYING vec2 vary_texcoord0;
 
+vec2 encode_normal(vec3 n)
+{
+	float f = sqrt(8 * n.z + 8);
+	return n.xy / f + 0.5;
+}
+
 void main() 
 {
 	vec4 diff = texture2D(diffuseMap, vary_texcoord0.xy);
@@ -46,6 +52,6 @@ void main()
 	frag_data[0] = vec4(diff.rgb, 0.0);
 	frag_data[1] = vec4(0,0,0,0);
 	vec3 nvn = normalize(vary_normal);
-	frag_data[2] = vec4(nvn.xyz * 0.5 + 0.5, 0.0);
+	frag_data[2] = vec4(encode_normal(nvn.xyz), 0.0, 0.0);
 }
 
diff --git a/indra/newview/app_settings/shaders/class1/deferred/bumpF.glsl b/indra/newview/app_settings/shaders/class1/deferred/bumpF.glsl
index a887728493..595c11fae2 100644
--- a/indra/newview/app_settings/shaders/class1/deferred/bumpF.glsl
+++ b/indra/newview/app_settings/shaders/class1/deferred/bumpF.glsl
@@ -39,6 +39,12 @@ VARYING vec3 vary_mat2;
 VARYING vec4 vertex_color;
 VARYING vec2 vary_texcoord0;
 
+vec2 encode_normal(vec3 n)
+{
+	float f = sqrt(8 * n.z + 8);
+	return n.xy / f + 0.5;
+}
+
 void main() 
 {
 	vec3 col = vertex_color.rgb * texture2D(diffuseMap, vary_texcoord0.xy).rgb;
@@ -52,5 +58,5 @@ void main()
 	frag_data[1] = vertex_color.aaaa; // spec
 	//frag_data[1] = vec4(vec3(vertex_color.a), vertex_color.a+(1.0-vertex_color.a)*vertex_color.a); // spec - from former class3 - maybe better, but not so well tested
 	vec3 nvn = normalize(tnorm);
-	frag_data[2] = vec4(nvn.xyz * 0.5 + 0.5, vertex_color.a);
+	frag_data[2] = vec4(encode_normal(nvn.xyz), vertex_color.a, 0.0);
 }
diff --git a/indra/newview/app_settings/shaders/class1/deferred/diffuseAlphaMaskF.glsl b/indra/newview/app_settings/shaders/class1/deferred/diffuseAlphaMaskF.glsl
index c1fa9e4aac..7930b5d18b 100644
--- a/indra/newview/app_settings/shaders/class1/deferred/diffuseAlphaMaskF.glsl
+++ b/indra/newview/app_settings/shaders/class1/deferred/diffuseAlphaMaskF.glsl
@@ -37,6 +37,12 @@ VARYING vec3 vary_normal;
 VARYING vec4 vertex_color;
 VARYING vec2 vary_texcoord0;
 
+vec2 encode_normal(vec3 n)
+{
+	float f = sqrt(8 * n.z + 8);
+	return n.xy / f + 0.5;
+}
+
 void main() 
 {
 	vec4 col = texture2D(diffuseMap, vary_texcoord0.xy) * vertex_color;
@@ -49,6 +55,6 @@ void main()
 	frag_data[0] = vec4(col.rgb, 0.0);
 	frag_data[1] = vec4(0,0,0,0); // spec
 	vec3 nvn = normalize(vary_normal);
-	frag_data[2] = vec4(nvn.xyz * 0.5 + 0.5, 0.0);
+	frag_data[2] = vec4(encode_normal(nvn.xyz), 0.0, 0.0);
 }
 
diff --git a/indra/newview/app_settings/shaders/class1/deferred/diffuseAlphaMaskIndexedF.glsl b/indra/newview/app_settings/shaders/class1/deferred/diffuseAlphaMaskIndexedF.glsl
index 4c68123fac..59d109b886 100644
--- a/indra/newview/app_settings/shaders/class1/deferred/diffuseAlphaMaskIndexedF.glsl
+++ b/indra/newview/app_settings/shaders/class1/deferred/diffuseAlphaMaskIndexedF.glsl
@@ -36,6 +36,12 @@ uniform float minimum_alpha;
 VARYING vec4 vertex_color;
 VARYING vec2 vary_texcoord0;
 
+vec2 encode_normal(vec3 n)
+{
+	float f = sqrt(8 * n.z + 8);
+	return n.xy / f + 0.5;
+}
+
 void main() 
 {
 	vec4 col = diffuseLookup(vary_texcoord0.xy) * vertex_color;
@@ -48,5 +54,5 @@ void main()
 	frag_data[0] = vec4(col.rgb, 0.0);
 	frag_data[1] = vec4(0,0,0,0);
 	vec3 nvn = normalize(vary_normal);
-	frag_data[2] = vec4(nvn.xyz * 0.5 + 0.5, 0.0);
+	frag_data[2] = vec4(encode_normal(nvn.xyz), 0.0, 0.0);
 }
diff --git a/indra/newview/app_settings/shaders/class1/deferred/diffuseAlphaMaskNoColorF.glsl b/indra/newview/app_settings/shaders/class1/deferred/diffuseAlphaMaskNoColorF.glsl
index ad65c7d330..37d70a2412 100644
--- a/indra/newview/app_settings/shaders/class1/deferred/diffuseAlphaMaskNoColorF.glsl
+++ b/indra/newview/app_settings/shaders/class1/deferred/diffuseAlphaMaskNoColorF.glsl
@@ -37,6 +37,12 @@ uniform sampler2D diffuseMap;
 VARYING vec3 vary_normal;
 VARYING vec2 vary_texcoord0;
 
+vec2 encode_normal(vec3 n)
+{
+	float f = sqrt(8 * n.z + 8);
+	return n.xy / f + 0.5;
+}
+
 void main() 
 {
 	vec4 col = texture2D(diffuseMap, vary_texcoord0.xy);
@@ -49,6 +55,6 @@ void main()
 	frag_data[0] = vec4(col.rgb, 0.0);
 	frag_data[1] = vec4(0,0,0,0); // spec
 	vec3 nvn = normalize(vary_normal);
-	frag_data[2] = vec4(nvn.xyz * 0.5 + 0.5, 0.0);
+	frag_data[2] = vec4(encode_normal(nvn.xyz), 0.0, 0.0);
 }
 
diff --git a/indra/newview/app_settings/shaders/class1/deferred/diffuseF.glsl b/indra/newview/app_settings/shaders/class1/deferred/diffuseF.glsl
index 2e456d00dd..6befb1bd8b 100644
--- a/indra/newview/app_settings/shaders/class1/deferred/diffuseF.glsl
+++ b/indra/newview/app_settings/shaders/class1/deferred/diffuseF.glsl
@@ -35,6 +35,12 @@ VARYING vec3 vary_normal;
 VARYING vec4 vertex_color;
 VARYING vec2 vary_texcoord0;
 
+vec2 encode_normal(vec3 n)
+{
+	float f = sqrt(8 * n.z + 8);
+	return n.xy / f + 0.5;
+}
+
 void main() 
 {
 	vec3 col = vertex_color.rgb * texture2D(diffuseMap, vary_texcoord0.xy).rgb;
@@ -42,6 +48,6 @@ void main()
 	frag_data[1] = vertex_color.aaaa; // spec
 	//frag_data[1] = vec4(vec3(vertex_color.a), vertex_color.a+(1.0-vertex_color.a)*vertex_color.a); // spec - from former class3 - maybe better, but not so well tested
 	vec3 nvn = normalize(vary_normal);
-	frag_data[2] = vec4(nvn.xyz * 0.5 + 0.5, vertex_color.a);
+	frag_data[2] = vec4(encode_normal(nvn.xyz), vertex_color.a, 0.0);
 }
 
diff --git a/indra/newview/app_settings/shaders/class1/deferred/diffuseIndexedF.glsl b/indra/newview/app_settings/shaders/class1/deferred/diffuseIndexedF.glsl
index bb6dc9a57d..40b980bf51 100644
--- a/indra/newview/app_settings/shaders/class1/deferred/diffuseIndexedF.glsl
+++ b/indra/newview/app_settings/shaders/class1/deferred/diffuseIndexedF.glsl
@@ -33,6 +33,13 @@ VARYING vec3 vary_normal;
 VARYING vec4 vertex_color;
 VARYING vec2 vary_texcoord0;
 
+vec2 encode_normal(vec3 n)
+{
+	float f = sqrt(8 * n.z + 8);
+	return n.xy / f + 0.5;
+}
+
+
 void main() 
 {
 	vec3 col = vertex_color.rgb * diffuseLookup(vary_texcoord0.xy).rgb;
@@ -41,5 +48,5 @@ void main()
 	frag_data[1] = vertex_color.aaaa; // spec
 	//frag_data[1] = vec4(vec3(vertex_color.a), vertex_color.a+(1.0-vertex_color.a)*vertex_color.a); // spec - from former class3 - maybe better, but not so well tested
 	vec3 nvn = normalize(vary_normal);
-	frag_data[2] = vec4(nvn.xyz * 0.5 + 0.5, vertex_color.a);
+	frag_data[2] = vec4(encode_normal(nvn.xyz), vertex_color.a, 0.0);
 }
diff --git a/indra/newview/app_settings/shaders/class1/deferred/materialF.glsl b/indra/newview/app_settings/shaders/class1/deferred/materialF.glsl
index de404cbffe..35b176b457 100644
--- a/indra/newview/app_settings/shaders/class1/deferred/materialF.glsl
+++ b/indra/newview/app_settings/shaders/class1/deferred/materialF.glsl
@@ -43,11 +43,11 @@ uniform sampler2D bumpMap;
 
 #if HAS_SPECULAR_MAP
 uniform sampler2D specularMap;
-uniform float env_intensity;
 
 VARYING vec2 vary_texcoord2;
 #endif
 
+uniform float env_intensity;
 uniform vec4 specular_color;
 
 #if DIFFUSE_ALPHA_MODE == DIFFUSE_ALPHA_MODE_MASK
@@ -66,6 +66,11 @@ VARYING vec3 vary_normal;
 VARYING vec4 vertex_color;
 VARYING vec2 vary_texcoord0;
 
+vec2 encode_normal(vec3 n)
+{
+	float f = sqrt(8 * n.z + 8);
+	return n.xy / f + 0.5;
+}
 
 void main() 
 {
@@ -109,16 +114,14 @@ void main()
 	//final_color.rgb *= 1 - spec.a * env_intensity;
 	final_specular.rgb *= specular_color.rgb;
 	
-	vec4 final_normal = vec4(normalize(tnorm), spec.a * env_intensity);
+	vec4 final_normal = vec4(encode_normal(normalize(tnorm)), spec.a * env_intensity, 0.0);
 	final_specular.a = specular_color.a * norm.a;
 #else
-	vec4 final_normal = vec4(normalize(tnorm), 0.0);
+	vec4 final_normal = vec4(encode_normal(normalize(tnorm)), env_intensity, 0.0);
 	final_specular.a = specular_color.a;
 #endif
-
-	final_normal.xyz = final_normal.xyz * 0.5 + 0.5;
 	
 	frag_data[0] = final_color;
 	frag_data[1] = final_specular; // XYZ = Specular color. W = Specular exponent.
-	frag_data[2] = final_normal; // XYZ = Normal.  W = Env. intensity.
+	frag_data[2] = final_normal; // XY = Normal.  Z = Env. intensity.
 }
diff --git a/indra/newview/app_settings/shaders/class1/deferred/multiPointLightF.glsl b/indra/newview/app_settings/shaders/class1/deferred/multiPointLightF.glsl
index c11298aadd..5329ae9dd7 100644
--- a/indra/newview/app_settings/shaders/class1/deferred/multiPointLightF.glsl
+++ b/indra/newview/app_settings/shaders/class1/deferred/multiPointLightF.glsl
@@ -56,6 +56,17 @@ uniform float far_z;
 
 uniform mat4 inv_proj;
 
+vec3 decode_normal (vec2 enc)
+{
+    vec2 fenc = enc*4-2;
+    float f = dot(fenc,fenc);
+    float g = sqrt(1-f/4);
+    vec3 n;
+    n.xy = fenc*g;
+    n.z = 1-f/2;
+    return n;
+}
+
 vec4 getPosition(vec2 pos_screen)
 {
 	float depth = texture2DRect(depthMap, pos_screen.xy).r;
@@ -79,7 +90,7 @@ void main()
 	}
 	
 	vec3 norm = texture2DRect(normalMap, frag.xy).xyz;
-	norm = (norm.xyz-0.5)*2.0; // unpack norm
+	norm = decode_normal(norm.xy); // unpack norm
 	norm = normalize(norm);
 	vec4 spec = texture2DRect(specularRect, frag.xy);
 	vec3 diff = texture2DRect(diffuseRect, frag.xy).rgb;
diff --git a/indra/newview/app_settings/shaders/class1/deferred/multiSpotLightF.glsl b/indra/newview/app_settings/shaders/class1/deferred/multiSpotLightF.glsl
index 09d23db096..9746218ea6 100644
--- a/indra/newview/app_settings/shaders/class1/deferred/multiSpotLightF.glsl
+++ b/indra/newview/app_settings/shaders/class1/deferred/multiSpotLightF.glsl
@@ -67,6 +67,17 @@ uniform vec2 screen_res;
 
 uniform mat4 inv_proj;
 
+vec3 decode_normal (vec2 enc)
+{
+    vec2 fenc = enc*4-2;
+    float f = dot(fenc,fenc);
+    float g = sqrt(1-f/4);
+    vec3 n;
+    n.xy = fenc*g;
+    n.z = 1-f/2;
+    return n;
+}
+
 vec4 texture2DLodSpecular(sampler2D projectionMap, vec2 tc, float lod)
 {
 	vec4 ret = texture2DLod(projectionMap, tc, lod);
@@ -143,7 +154,7 @@ void main()
 	}
 		
 	vec3 norm = texture2DRect(normalMap, frag.xy).xyz;
-	norm = norm = (norm.xyz-0.5)*2.0;
+	norm = decode_normal(norm.xy);
 	
 	norm = normalize(norm);
 	float l_dist = -dot(lv, proj_n);
diff --git a/indra/newview/app_settings/shaders/class1/deferred/pointLightF.glsl b/indra/newview/app_settings/shaders/class1/deferred/pointLightF.glsl
index e99329bbf2..27863b0095 100644
--- a/indra/newview/app_settings/shaders/class1/deferred/pointLightF.glsl
+++ b/indra/newview/app_settings/shaders/class1/deferred/pointLightF.glsl
@@ -54,6 +54,17 @@ uniform vec2 screen_res;
 uniform mat4 inv_proj;
 uniform vec4 viewport;
 
+vec3 decode_normal (vec2 enc)
+{
+    vec2 fenc = enc*4-2;
+    float f = dot(fenc,fenc);
+    float g = sqrt(1-f/4);
+    vec3 n;
+    n.xy = fenc*g;
+    n.z = 1-f/2;
+    return n;
+}
+
 vec4 getPosition(vec2 pos_screen)
 {
 	float depth = texture2DRect(depthMap, pos_screen.xy).r;
@@ -84,7 +95,7 @@ void main()
 	}
 	
 	vec3 norm = texture2DRect(normalMap, frag.xy).xyz;
-	norm = (norm.xyz-0.5)*2.0; // unpack norm
+	norm = decode_normal(norm.xy); // unpack norm
 	float da = dot(norm, lv);
 	if (da < 0.0)
 	{
diff --git a/indra/newview/app_settings/shaders/class1/deferred/skyF.glsl b/indra/newview/app_settings/shaders/class1/deferred/skyF.glsl
index faa54a316e..20a756530a 100644
--- a/indra/newview/app_settings/shaders/class1/deferred/skyF.glsl
+++ b/indra/newview/app_settings/shaders/class1/deferred/skyF.glsl
@@ -61,6 +61,6 @@ void main()
 	/// Gamma correct for WL (soft clip effect).
 	frag_data[0] = vec4(scaleSoftClip(color.rgb), 1.0);
 	frag_data[1] = vec4(0.0,0.0,0.0,0.0);
-	frag_data[2] = vec4(0,0,1,0);
+	frag_data[2] = vec4(0.5,0.5,0.5,0);
 }
 
diff --git a/indra/newview/app_settings/shaders/class1/deferred/softenLightF.glsl b/indra/newview/app_settings/shaders/class1/deferred/softenLightF.glsl
index 437a06320e..5f88cca30b 100644
--- a/indra/newview/app_settings/shaders/class1/deferred/softenLightF.glsl
+++ b/indra/newview/app_settings/shaders/class1/deferred/softenLightF.glsl
@@ -77,6 +77,17 @@ vec3 vary_AtmosAttenuation;
 uniform mat4 inv_proj;
 uniform vec2 screen_res;
 
+vec3 decode_normal (vec2 enc)
+{
+    vec2 fenc = enc*4-2;
+    float f = dot(fenc,fenc);
+    float g = sqrt(1-f/4);
+    vec3 n;
+    n.xy = fenc*g;
+    n.z = 1-f/2;
+    return n;
+}
+
 vec4 getPosition_d(vec2 pos_screen, float depth)
 {
 	vec2 sc = pos_screen.xy*2.0;
@@ -276,7 +287,8 @@ void main()
 	float depth = texture2DRect(depthMap, tc.xy).r;
 	vec3 pos = getPosition_d(tc, depth).xyz;
 	vec4 norm = texture2DRect(normalMap, tc);
-	norm.xyz = (norm.xyz-0.5)*2.0; // unpack norm
+	float envIntensity = norm.z;
+	norm.xyz = decode_normal(norm.xy); // unpack norm
 		
 	float da = max(dot(norm.xyz, sun_dir.xyz), 0.0);
 	
@@ -312,7 +324,7 @@ void main()
 			//add environmentmap
 			vec3 env_vec = env_mat * refnormpersp;
 			col = mix(col.rgb, textureCube(environmentMap, env_vec).rgb, 
-				max(norm.a-diffuse.a*2.0, 0.0)); 
+				max(envIntensity-diffuse.a*2.0, 0.0)); 
 		}
 	
 		col = atmosLighting(col);
diff --git a/indra/newview/app_settings/shaders/class1/deferred/spotLightF.glsl b/indra/newview/app_settings/shaders/class1/deferred/spotLightF.glsl
index 2f18e1a13d..d7f0ab6d8e 100644
--- a/indra/newview/app_settings/shaders/class1/deferred/spotLightF.glsl
+++ b/indra/newview/app_settings/shaders/class1/deferred/spotLightF.glsl
@@ -70,6 +70,17 @@ uniform vec2 screen_res;
 
 uniform mat4 inv_proj;
 
+vec3 decode_normal (vec2 enc)
+{
+    vec2 fenc = enc*4-2;
+    float f = dot(fenc,fenc);
+    float g = sqrt(1-f/4);
+    vec3 n;
+    n.xy = fenc*g;
+    n.z = 1-f/2;
+    return n;
+}
+
 vec4 texture2DLodSpecular(sampler2D projectionMap, vec2 tc, float lod)
 {
 	vec4 ret = texture2DLod(projectionMap, tc, lod);
@@ -146,7 +157,7 @@ void main()
 	}
 		
 	vec3 norm = texture2DRect(normalMap, frag.xy).xyz;
-	norm = vec3((norm.xy-0.5)*2.0, norm.z);
+	norm = decode_normal(norm.xy);
 	
 	norm = normalize(norm);
 	float l_dist = -dot(lv, proj_n);
diff --git a/indra/newview/app_settings/shaders/class1/deferred/sunLightSSAOF.glsl b/indra/newview/app_settings/shaders/class1/deferred/sunLightSSAOF.glsl
index bac74cbbef..1470239a71 100644
--- a/indra/newview/app_settings/shaders/class1/deferred/sunLightSSAOF.glsl
+++ b/indra/newview/app_settings/shaders/class1/deferred/sunLightSSAOF.glsl
@@ -49,6 +49,17 @@ VARYING vec2 vary_fragcoord;
 uniform mat4 inv_proj;
 uniform vec2 screen_res;
 
+vec3 decode_normal (vec2 enc)
+{
+    vec2 fenc = enc*4-2;
+    float f = dot(fenc,fenc);
+    float g = sqrt(1-f/4);
+    vec3 n;
+    n.xy = fenc*g;
+    n.z = 1-f/2;
+    return n;
+}
+
 vec4 getPosition(vec2 pos_screen)
 {
 	float depth = texture2DRect(depthMap, pos_screen.xy).r;
@@ -123,7 +134,7 @@ void main()
 	vec4 pos = getPosition(pos_screen);
 	
 	vec3 norm = texture2DRect(normalMap, pos_screen).xyz;
-	norm = (norm.xyz-0.5)*2.0; // unpack norm
+	norm = decode_normal(norm.xy);
 		
 	frag_color[0] = 1.0;
 	frag_color[1] = calcAmbientOcclusion(pos, norm);
diff --git a/indra/newview/app_settings/shaders/class1/deferred/terrainF.glsl b/indra/newview/app_settings/shaders/class1/deferred/terrainF.glsl
index daf1cc7ea2..52a429465f 100644
--- a/indra/newview/app_settings/shaders/class1/deferred/terrainF.glsl
+++ b/indra/newview/app_settings/shaders/class1/deferred/terrainF.glsl
@@ -39,6 +39,12 @@ VARYING vec3 vary_normal;
 VARYING vec4 vary_texcoord0;
 VARYING vec4 vary_texcoord1;
 
+vec2 encode_normal(vec3 n)
+{
+	float f = sqrt(8 * n.z + 8);
+	return n.xy / f + 0.5;
+}
+
 void main()
 {
 	/// Note: This should duplicate the blending functionality currently used for the terrain rendering.
@@ -56,6 +62,6 @@ void main()
 	frag_data[0] = vec4(outColor.rgb, 0.0);
 	frag_data[1] = vec4(0,0,0,0);
 	vec3 nvn = normalize(vary_normal);
-	frag_data[2] = vec4(nvn.xyz * 0.5 + 0.5, 0.0);
+	frag_data[2] = vec4(encode_normal(nvn.xyz), 0.0, 0.0);
 }
 
diff --git a/indra/newview/app_settings/shaders/class1/deferred/treeF.glsl b/indra/newview/app_settings/shaders/class1/deferred/treeF.glsl
index da253846ef..808750496f 100644
--- a/indra/newview/app_settings/shaders/class1/deferred/treeF.glsl
+++ b/indra/newview/app_settings/shaders/class1/deferred/treeF.glsl
@@ -37,6 +37,12 @@ VARYING vec2 vary_texcoord0;
 
 uniform float minimum_alpha;
 
+vec2 encode_normal(vec3 n)
+{
+	float f = sqrt(8 * n.z + 8);
+	return n.xy / f + 0.5;
+}
+
 void main() 
 {
 	vec4 col = texture2D(diffuseMap, vary_texcoord0.xy);
@@ -48,5 +54,5 @@ void main()
 	frag_data[0] = vec4(vertex_color.rgb*col.rgb, 0.0);
 	frag_data[1] = vec4(0,0,0,0);
 	vec3 nvn = normalize(vary_normal);
-	frag_data[2] = vec4(nvn.xyz * 0.5 + 0.5, 0.0);
+	frag_data[2] = vec4(encode_normal(nvn.xyz), 0.0, 0.0);
 }