Sky fixes.

Make class1 sky use pre-projection pos to get proper distances for attenuation.

Make all sky shaders use the dist_mul again.

Revert to using old sky tessellation logic (may regress bugs addressed by new tess code).

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

@@ -41,6 +41,7 @@ uniform vec4 gamma;
 
 /// Soft clips the light with a gamma correction
 vec3 scaleSoftClip(vec3 light);
+vec3 srgb_to_linear(vec3 c);
 
 void main()
 {

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

@@ -66,7 +66,7 @@ void main()
 	gl_Position = pos;
 	
 	// Get relative position
-	vec3 P = pos.xyz - camPosLocal.xyz + vec3(0,50,0);
+	vec3 P = position.xyz - camPosLocal.xyz + vec3(0,50,0);
 
 	// Set altitude
 	if (P.y > 0.)
@@ -81,7 +81,7 @@ void main()
 	// Can normalize then
 	vec3 Pn = normalize(P);
 
-	float  Plen = length(P);
+	float Plen = length(P);
 
 	// Initialize temp variables
 	vec4 temp1 = vec4(0.);
@@ -114,9 +114,7 @@ void main()
 	// Transparency (-> temp1)
     // ATI Bugfix -- can't store temp1*temp2.z in a variable because the ati
     // compiler gets confused.
-    //temp1 = exp(-temp1 * temp2.z * dist_mul);
-    temp1 = exp(-temp1 * dist_mul);
-
+    temp1 = exp(-temp1 * temp2.z * dist_mul);
 
 	// Compute haze glow
 	temp2.x = dot(Pn, lightnorm.xyz);
@@ -132,12 +130,13 @@ void main()
 	// Add "minimum anti-solar illumination"
 	temp2.x += .25;
 
-    temp2.x *= sun_moon_glow_factor;
+    //temp2.x *= sun_moon_glow_factor;
 
     vec4 color = (    blue_horizon * blue_weight * (sunlight + ambient_color)
                 + (haze_horizon * haze_weight) * (sunlight * temp2.x + ambient_color)
              );
 
+
     // Final atmosphere additive
     color *= (1. - temp1);
 

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

@@ -141,8 +141,7 @@ void main()
     // Transparency (-> temp1)
     // ATI Bugfix -- can't store temp1*temp2.z in a variable because the ati
     // compiler gets confused.
-    //temp1 = exp(-temp1 * temp2.z * dist_mul);
-    temp1 = exp(-temp1 * dist_mul);
+    temp1 = exp(-temp1 * temp2.z * dist_mul);
 
     // Compute haze glow
     temp2.x = dot(Pn, lightnorm.xyz);

indra/newview/app_settings/shaders/class2/windlight/skyV.glsl

@@ -111,7 +111,7 @@ void main()
 	// Transparency (-> temp1)
 	// ATI Bugfix -- can't store temp1*temp2.z in a variable because the ati
 	// compiler gets confused.
-	temp1 = exp(-temp1 * dist_mul);
+	temp1 = exp(-temp1 * temp2.z * dist_mul);
 
 	// Compute haze glow
 	temp2.x = dot(Pn, lightnorm.xyz);

indra/newview/llvowlsky.cpp

@@ -111,7 +111,7 @@ inline F32 LLVOWLSky::calcPhi(U32 i)
 	t = t*t;
 	t = 1.f - t;
 
-	return F_PI * t;
+	return (F_PI / 8.f) * t;
 }
 
 void LLVOWLSky::resetVertexBuffers()
@@ -382,7 +382,11 @@ void LLVOWLSky::buildStripsBuffer(U32 begin_stack,
 	llassert(end_stack <= num_stacks);
 
 	// stacks are iterated one-indexed since phi(0) was handled by the fan above
+#if NEW_TESS
 	for(i = begin_stack; i <= end_stack; ++i) 
+#else
+    for(i = begin_stack + 1; i <= end_stack+1; ++i) 
+#endif
 	{
 		phi0 = calcPhi(i);
 
@@ -396,7 +400,22 @@ void LLVOWLSky::buildStripsBuffer(U32 begin_stack,
 			y0 = cos(phi0);
 			z0 = sin(phi0) * sin(theta);
 
+#if NEW_TESS
             *vertices++ = LLVector3(x0 * RADIUS, y0 * RADIUS, z0 * RADIUS);
+#else
+            if (i == num_stacks-2)
+			{
+				*vertices++ = LLVector3(x0*RADIUS, y0*RADIUS-1024.f*2.f, z0*RADIUS);
+			}
+			else if (i == num_stacks-1)
+			{
+				*vertices++ = LLVector3(0, y0*RADIUS-1024.f*2.f, 0);
+			}
+			else
+			{
+				*vertices++		= LLVector3(x0 * RADIUS, y0 * RADIUS, z0 * RADIUS);
+			}
+#endif
 
 			++count_verts;
 
@@ -404,7 +423,7 @@ void LLVOWLSky::buildStripsBuffer(U32 begin_stack,
 			// note: x and z are transposed in order for things to animate
 			// correctly in the global coordinate system where +x is east and
 			// +y is north
-			*texCoords++ = LLVector2((-z0 + 1.f) / 2.f, (-x0 + 1.f) / 2.f);
+			*texCoords++	= LLVector2((-z0 + 1.f) / 2.f, (-x0 + 1.f) / 2.f);
 		}
 	}