Add new shaders for generating shadows from clouds.

Add new class3 shadow shaders for VSM shadows.

Add disabled shadow pass in WLSky for using above.

1 files changed, 121 insertions, 0 deletions

diff --git a/indra/newview/app_settings/shaders/class1/windlight/cloudShadowF.glsl b/indra/newview/app_settings/shaders/class1/windlight/cloudShadowF.glsl
new file mode 100644
index 0000000000..fa6926b007
--- /dev/null
+++ b/indra/newview/app_settings/shaders/class1/windlight/cloudShadowF.glsl
@@ -0,0 +1,121 @@
+/** 
+ * @file class3/deferred/cloudsF.glsl
+ *
+ * $LicenseInfo:firstyear=2005&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2005, Linden Research, Inc.
+ * 
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License only.
+ * 
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ * 
+ * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
+ * $/LicenseInfo$
+ */
+ 
+#ifdef DEFINE_GL_FRAGCOLOR
+out vec4 frag_color;
+#else
+#define frag_color gl_FragColor
+#endif
+
+uniform sampler2D diffuseMap;
+
+VARYING vec4 pos;
+VARYING float target_pos_x;
+VARYING float vary_CloudDensity;
+VARYING vec2 vary_texcoord0;
+VARYING vec2 vary_texcoord1;
+VARYING vec2 vary_texcoord2;
+VARYING vec2 vary_texcoord3;
+
+uniform sampler2D cloud_noise_texture;
+uniform sampler2D cloud_noise_texture_next;
+uniform float blend_factor;
+uniform vec4 cloud_pos_density1;
+uniform vec4 cloud_pos_density2;
+uniform vec4 sunlight_color;
+uniform vec4 cloud_color;
+uniform float cloud_shadow;
+uniform float cloud_scale;
+uniform float cloud_variance;
+uniform vec3 ambient;
+uniform vec3 camPosLocal;
+uniform vec3 sun_dir;
+uniform float sun_size;
+uniform float far_z;
+
+#if !DEPTH_CLAMP
+VARYING vec4 post_pos;
+#endif
+
+vec4 cloudNoise(vec2 uv)
+{
+   vec4 a = texture2D(cloud_noise_texture, uv);
+   vec4 b = texture2D(cloud_noise_texture_next, uv);
+   vec4 cloud_noise_sample = mix(a, b, blend_factor);
+   return normalize(cloud_noise_sample);
+}
+
+void main()
+{
+	// Set variables
+	vec2 uv1 = vary_texcoord0.xy;
+	vec2 uv2 = vary_texcoord1.xy;
+	vec2 uv3 = vary_texcoord2.xy;
+	float cloudDensity = 2.0 * (cloud_shadow - 0.25);
+
+	vec2 uv4 = vary_texcoord3.xy;
+
+    vec2 disturbance  = vec2(cloudNoise(uv1 / 8.0f).x, cloudNoise((uv3 + uv1) / 16.0f).x) * cloud_variance * (1.0f - cloud_scale * 0.25f);
+    vec2 disturbance2 = vec2(cloudNoise((uv1 + uv3) / 4.0f).x, cloudNoise((uv4 + uv2) / 8.0f).x) * cloud_variance * (1.0f - cloud_scale * 0.25f);
+
+	// Offset texture coords
+	uv1 += cloud_pos_density1.xy + (disturbance * 0.02);	//large texture, visible density
+	uv2 += cloud_pos_density1.xy;	//large texture, self shadow
+	uv3 += cloud_pos_density2.xy;	//small texture, visible density
+	uv4 += cloud_pos_density2.xy;	//small texture, self shadow
+
+    float density_variance = min(1.0, (disturbance.x* 2.0 + disturbance.y* 2.0 + disturbance2.x + disturbance2.y));
+
+    cloudDensity *= 1.0 - (density_variance * density_variance);
+
+	// Compute alpha1, the main cloud opacity
+	float alpha1 = (cloudNoise(uv1).x - 0.5) + (cloudNoise(uv3).x - 0.5) * cloud_pos_density2.z;
+	alpha1 = min(max(alpha1 + cloudDensity, 0.) * 10 * cloud_pos_density1.z, 1.);
+
+	// And smooth
+	alpha1 = 1. - alpha1 * alpha1;
+	alpha1 = 1. - alpha1 * alpha1;	
+
+    if (alpha1 < 0.001f)
+    {
+        discard;
+    }
+
+	// Compute alpha2, for self shadowing effect
+	// (1 - alpha2) will later be used as percentage of incoming sunlight
+	float alpha2 = (cloudNoise(uv2).x - 0.5);
+	alpha2 = min(max(alpha2 + cloudDensity, 0.) * 2.5 * cloud_pos_density1.z, 1.);
+
+	// And smooth
+	alpha2 = 1. - alpha2;
+	alpha2 = 1. - alpha2 * alpha2;	
+
+    frag_color = vec4(alpha1, alpha1, alpha1, 1);
+
+#if !DEPTH_CLAMP
+	gl_FragDepth = max(post_pos.z/post_pos.w*0.5+0.5, 0.0);
+#endif
+
+}