1 files changed, 157 insertions, 0 deletions
diff --git a/indra/newview/app_settings/shaders/class3/deferred/shadowUtil.glsl b/indra/newview/app_settings/shaders/class3/deferred/shadowUtil.glsl
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+++ b/indra/newview/app_settings/shaders/class3/deferred/shadowUtil.glsl
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+/** 
+ * @file class3/deferred/shadowUtil.glsl
+ *
+ * $LicenseInfo:firstyear=2007&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2007, 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
+ * $/LicenseInfo$
+ */
+
+uniform sampler2D       shadowMap0;
+uniform sampler2D       shadowMap1;
+uniform sampler2D       shadowMap2;
+uniform sampler2D       shadowMap3;
+uniform sampler2D       shadowMap4;
+uniform sampler2D       shadowMap5;
+
+uniform vec3 sun_dir;
+uniform vec3 moon_dir;
+uniform vec2 shadow_res;
+uniform vec2 proj_shadow_res;
+uniform mat4 shadow_matrix[6];
+uniform vec4 shadow_clip;
+uniform float shadow_bias;
+
+uniform float spot_shadow_bias;
+uniform float spot_shadow_offset;
+
+float getDepth(vec2 screenpos);
+vec3 getNorm(vec2 screenpos);
+vec4 getPosition(vec2 pos_screen);
+
+float ReduceLightBleeding(float p_max, float Amount)
+{
+    return smoothstep(Amount, 1, p_max);
+}
+
+float ChebyshevUpperBound(vec2 m, float t, float min_v, float Amount)
+{
+    float p = (t <= m.x) ? 1.0 : 0.0;
+
+    float v = m.y - (m.x*m.x);
+    v = max(v, min_v);
+
+    float d = t - m.x;
+
+    float p_max = v / (v + d*d);
+
+    p_max = ReduceLightBleeding(p_max, Amount);
+
+    return max(p, p_max);
+}
+
+vec4 computeMoments(float depth, float a)
+{
+    float m1 = depth;
+    float dx = dFdx(depth);
+    float dy = dFdy(depth);
+    float m2 = m1*m1 + 0.25 * a * (dx*dx + dy*dy);
+    return vec4(m1, m2, a, max(dx, dy));
+}
+
+float vsmDirectionalSample(vec4 stc, float depth, sampler2D shadowMap, mat4 shadowMatrix)
+{
+    vec4 lpos = shadowMatrix * stc;
+    vec4 moments = texture2D(shadowMap, lpos.xy);
+    return ChebyshevUpperBound(moments.rg, depth - shadow_bias * 256.0f, 0.125, 0.9);
+}
+
+float vsmSpotSample(vec4 stc, float depth, sampler2D shadowMap, mat4 shadowMatrix)
+{
+    vec4 lpos = shadowMatrix * stc;
+    vec4 moments = texture2D(shadowMap, lpos.xy);
+    lpos.xyz /= lpos.w;
+    lpos.xy *= 0.5;
+    lpos.xy += 0.5;
+    return ChebyshevUpperBound(moments.rg, depth - spot_shadow_bias * 16.0f, 0.125, 0.9);
+}
+
+#if VSM_POINT_SHADOWS
+float vsmPointSample(float lightDistance, vec3 lightDirection, samplerCube shadow_cube_map)
+{
+    vec4 moments = textureCube(shadow_cube_map, light_direction);
+    return ChebyshevUpperBound(moments.rg, light_distance, 0.01, 0.25);
+}
+#endif
+
+float sampleDirectionalShadow(vec3 pos, vec3 norm, vec2 pos_screen)
+{
+	if (pos.z < -shadow_clip.w)
+    {
+        discard;
+    }
+
+    float depth = getDepth(pos_screen);
+
+    vec4 spos       = vec4(pos,1.0);
+    vec4 near_split = shadow_clip*-0.75;
+    vec4 far_split  = shadow_clip*-1.25;
+
+    float shadow = 0.0f;
+    float weight = 1.0;
+
+    if (spos.z < near_split.z)
+    {
+        shadow += vsmDirectionalSample(spos, depth, shadowMap3, shadow_matrix[3]);
+        weight += 1.0f;
+    }
+    if (spos.z < near_split.y)
+    {
+        shadow += vsmDirectionalSample(spos, depth, shadowMap2, shadow_matrix[2]);
+        weight += 1.0f;
+    }
+    if (spos.z < near_split.x)
+    {
+        shadow += vsmDirectionalSample(spos, depth, shadowMap1, shadow_matrix[1]);
+        weight += 1.0f;
+    }
+    if (spos.z > far_split.x)
+    {
+        shadow += vsmDirectionalSample(spos, depth, shadowMap0, shadow_matrix[0]);
+        weight += 1.0f;
+    }
+
+    shadow /= weight;
+
+    return shadow;
+}
+
+float sampleSpotShadow(vec3 pos, vec3 norm, int index, vec2 pos_screen)
+{
+	if (pos.z < -shadow_clip.w)
+    {
+        discard;
+    }
+
+    float depth = getDepth(pos_screen);
+
+    pos += norm * spot_shadow_offset;
+    return vsmSpotSample(vec4(pos, 1.0), depth, (index == 0) ? shadowMap4 : shadowMap5, shadow_matrix[4 + index]);
+}
+