Second Life viewer sources 1.19.1.0

1 files changed, 163 insertions, 0 deletions

diff --git a/linden/indra/newview/app_settings/shaders/class2/windlight/cloudsV.glsl b/linden/indra/newview/app_settings/shaders/class2/windlight/cloudsV.glsl
new file mode 100644
index 0000000..e149d58
--- /dev/null
+++ b/linden/indra/newview/app_settings/shaders/class2/windlight/cloudsV.glsl
@@ -0,0 +1,163 @@
+/** 
+ * @file WLCloudsV.glsl
+ *
+ * Copyright (c) 2005-$CurrentYear$, Linden Research, Inc.
+ * $License$
+ */
+
+//////////////////////////////////////////////////////////////////////////
+// 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
+}
+