1 files changed, 140 insertions, 0 deletions
diff --git a/indra/newview/app_settings/shaders/class1/deferred/skyV.glsl b/indra/newview/app_settings/shaders/class1/deferred/skyV.glsl
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+++ b/indra/newview/app_settings/shaders/class1/deferred/skyV.glsl
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+/** 
+ * @file WLSkyV.glsl
+ *
+ * $LicenseInfo:firstyear=2005&license=viewerlgpl$
+ * $/LicenseInfo$
+ */
+ 
+
+
+// SKY ////////////////////////////////////////////////////////////////////////
+// The vertex shader for creating the atmospheric sky
+///////////////////////////////////////////////////////////////////////////////
+
+// Output parameters
+varying vec4 vary_HazeColor;
+
+// Inputs
+uniform vec3 camPosLocal;
+
+uniform vec4 lightnorm;
+uniform vec4 sunlight_color;
+uniform vec4 ambient;
+uniform vec4 blue_horizon;
+uniform vec4 blue_density;
+uniform vec4 haze_horizon;
+uniform vec4 haze_density;
+
+uniform vec4 cloud_shadow;
+uniform vec4 density_multiplier;
+uniform vec4 max_y;
+
+uniform vec4 glow;
+
+uniform vec4 cloud_color;
+
+uniform vec4 cloud_scale;
+
+void main()
+{
+
+	// World / view / projection
+	gl_Position = ftransform();
+	gl_TexCoord[0] = gl_MultiTexCoord0;
+
+	// Get relative position
+	vec3 P = gl_Vertex.xyz - camPosLocal.xyz + vec3(0,50,0);
+	//vec3 P = gl_Vertex.xyz + vec3(0,50,0);
+
+	// Set altitude
+	if (P.y > 0.)
+	{
+		P *= (max_y.x / P.y);
+	}
+	else
+	{
+		P *= (-32000. / P.y);
+	}
+
+	// Can normalize then
+	vec3 Pn = normalize(P);
+	float  Plen = length(P);
+
+	// Initialize temp variables
+	vec4 temp1 = vec4(0.);
+	vec4 temp2 = vec4(0.);
+	vec4 blue_weight;
+	vec4 haze_weight;
+	vec4 sunlight = sunlight_color;
+	vec4 light_atten;
+
+
+	// Sunlight attenuation effect (hue and brightness) due to atmosphere
+	// this is used later for sunlight modulation at various altitudes
+	light_atten = (blue_density * 1.0 + haze_density.x * 0.25) * (density_multiplier.x * max_y.x);
+
+	// Calculate relative weights
+	temp1 = blue_density + haze_density.x;
+	blue_weight = blue_density / temp1;
+	haze_weight = haze_density.x / temp1;
+
+	// Compute sunlight from P & lightnorm (for long rays like sky)
+	temp2.y = max(0., max(0., Pn.y) * 1.0 + lightnorm.y );
+	temp2.y = 1. / temp2.y;
+	sunlight *= exp( - light_atten * temp2.y);
+
+	// Distance
+	temp2.z = Plen * density_multiplier.x;
+
+	// Transparency (-> temp1)
+	// ATI Bugfix -- can't store temp1*temp2.z in a variable because the ati
+	// compiler gets confused.
+	temp1 = exp(-temp1 * temp2.z);
+
+
+	// Compute haze glow
+	temp2.x = dot(Pn, lightnorm.xyz);
+	temp2.x = 1. - temp2.x;
+		// temp2.x is 0 at the sun and increases away from sun
+	temp2.x = max(temp2.x, .001);	
+		// Set a minimum "angle" (smaller glow.y allows tighter, brighter hotspot)
+	temp2.x *= glow.x;
+		// Higher glow.x gives dimmer glow (because next step is 1 / "angle")
+	temp2.x = pow(temp2.x, glow.z);
+		// glow.z should be negative, so we're doing a sort of (1 / "angle") function
+
+	// Add "minimum anti-solar illumination"
+	temp2.x += .25;
+
+
+	// Haze color above cloud
+	vary_HazeColor = (	  blue_horizon * blue_weight * (sunlight + ambient)
+				+ (haze_horizon.r * haze_weight) * (sunlight * temp2.x + ambient)
+			 );	
+
+
+	// Increase ambient when there are more clouds
+	vec4 tmpAmbient = ambient;
+	tmpAmbient += (1. - tmpAmbient) * cloud_shadow.x * 0.5; 
+
+	// Dim sunlight by cloud shadow percentage
+	sunlight *= (1. - cloud_shadow.x);
+
+	// Haze color below cloud
+	vec4 additiveColorBelowCloud = (	  blue_horizon * blue_weight * (sunlight + tmpAmbient)
+				+ (haze_horizon.r * haze_weight) * (sunlight * temp2.x + tmpAmbient)
+			 );	
+
+	// Final atmosphere additive
+	vary_HazeColor *= (1. - temp1);
+	
+	// Attenuate cloud color by atmosphere
+	temp1 = sqrt(temp1);	//less atmos opacity (more transparency) below clouds
+
+	// At horizon, blend high altitude sky color towards the darker color below the clouds
+	vary_HazeColor += (additiveColorBelowCloud - vary_HazeColor) * (1. - sqrt(temp1));
+	
+	// won't compile on mac without this being set
+	//vary_AtmosAttenuation = vec3(0.0,0.0,0.0);
+}
+