rayleigh: fix fast shader

Author: Mc-Pain

data/shaders/opengl/rayleigh_fast.shaderdef

@@ -3,6 +3,8 @@
 
 Shader rayleigh_fast
 
+Texture sampler2D scatterLUT
+
 Buffer LightData binding=0
 Buffer DrawData binding=1
 Buffer BaseSphereData binding=2

data/shaders/opengl/rayleigh_fast.vert

@@ -7,6 +7,7 @@
 #include "rayleigh.glsl"
 
 uniform int NumShadows;
+uniform sampler2D scatterLUT;
 
 out vec4 varyingEyepos;
 out vec4 vertexColor;
@@ -41,7 +42,7 @@ void main(void)
 		vec3 lightPosAU = uLight[i].position.xyz / AU;
 		float intensity = 1.f / dot(lightPosAU, lightPosAU); // magic to avoid calculating length and then squaring it
 
-		specularHighlight += calculateAtmosphereColor(planet, atmosphere, toLinear(uLight[i].diffuse), lightDir, vec3(0.0), eyenorm, uneclipsed) * intensity;
+		specularHighlight += calculateAtmosphereColor(planet, atmosphere, toLinear(uLight[i].diffuse), lightDir, vec3(0.0), eyenorm, uneclipsed, scatterLUT) * intensity;
 
 	}
 #endif