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+/**
+ * @file WLCloudsV.glsl
+ *
+ * $LicenseInfo:firstyear=2005&license=viewerlgpl$
+ * $/LicenseInfo$
+ */
+
+
+
+//////////////////////////////////////////////////////////////////////////
+// The vertex shader for creating the atmospheric sky
+///////////////////////////////////////////////////////////////////////////////
+
+// Output parameters
+varying vec4 vary_CloudColorSun;
+varying vec4 vary_CloudColorAmbient;
+varying float vary_CloudDensity;
+
+// 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);
+
+ // 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;
+
+ // 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)
+ );
+
+ // CLOUDS
+
+ sunlight = sunlight_color;
+ temp2.y = max(0., lightnorm.y * 2.);
+ temp2.y = 1. / temp2.y;
+ sunlight *= exp( - light_atten * temp2.y);
+
+ // Cloud color out
+ vary_CloudColorSun = (sunlight * temp2.x) * cloud_color;
+ vary_CloudColorAmbient = tmpAmbient * cloud_color;
+
+ // Attenuate cloud color by atmosphere
+ temp1 = sqrt(temp1); //less atmos opacity (more transparency) below clouds
+ vary_CloudColorSun *= temp1;
+ vary_CloudColorAmbient *= temp1;
+ vec4 oHazeColorBelowCloud = additiveColorBelowCloud * (1. - temp1);
+
+ // Make a nice cloud density based on the cloud_shadow value that was passed in.
+ vary_CloudDensity = 2. * (cloud_shadow.x - 0.25);
+
+
+ // Texture coords
+ gl_TexCoord[0] = gl_MultiTexCoord0;
+ gl_TexCoord[0].xy -= 0.5;
+ gl_TexCoord[0].xy /= cloud_scale.x;
+ gl_TexCoord[0].xy += 0.5;
+
+ gl_TexCoord[1] = gl_TexCoord[0];
+ gl_TexCoord[1].x += lightnorm.x * 0.0125;
+ gl_TexCoord[1].y += lightnorm.z * 0.0125;
+
+ gl_TexCoord[2] = gl_TexCoord[0] * 16.;
+ gl_TexCoord[3] = gl_TexCoord[1] * 16.;
+
+ // Combine these to minimize register use
+ vary_CloudColorAmbient += oHazeColorBelowCloud;
+
+ // needs this to compile on mac
+ //vary_AtmosAttenuation = vec3(0.0,0.0,0.0);
+
+ // END CLOUDS
+}
+