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+/**
+ * @file class1/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 sampler2DRect normalMap;
+uniform sampler2DRect depthMap;
+uniform sampler2DShadow shadowMap0;
+uniform sampler2DShadow shadowMap1;
+uniform sampler2DShadow shadowMap2;
+uniform sampler2DShadow shadowMap3;
+uniform sampler2DShadow shadowMap4;
+uniform sampler2DShadow 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 shadow_offset;
+uniform float spot_shadow_bias;
+uniform float spot_shadow_offset;
+uniform mat4 inv_proj;
+uniform vec2 screen_res;
+uniform int sun_up_factor;
+
+float pcfShadow(sampler2DShadow shadowMap, vec3 norm, vec4 stc, float bias_mul, vec2 pos_screen, vec3 light_dir)
+{
+ float offset = shadow_bias * bias_mul;
+ stc.xyz /= stc.w;
+ stc.z += offset * 2.0;
+ stc.x = floor(stc.x*shadow_res.x + fract(pos_screen.y*shadow_res.y))/shadow_res.x; // add some chaotic jitter to X sample pos according to Y to disguise the snapping going on here
+ float cs = shadow2D(shadowMap, stc.xyz).x;
+ float shadow = cs * 4.0;
+ shadow += shadow2D(shadowMap, stc.xyz+vec3( 1.5/shadow_res.x, 0.5/shadow_res.y, 0.0)).x;
+ shadow += shadow2D(shadowMap, stc.xyz+vec3( 0.5/shadow_res.x, -1.5/shadow_res.y, 0.0)).x;
+ shadow += shadow2D(shadowMap, stc.xyz+vec3(-1.5/shadow_res.x, -0.5/shadow_res.y, 0.0)).x;
+ shadow += shadow2D(shadowMap, stc.xyz+vec3(-0.5/shadow_res.x, 1.5/shadow_res.y, 0.0)).x;
+ return clamp(shadow * 0.125, 0.0, 1.0);
+}
+
+float pcfSpotShadow(sampler2DShadow shadowMap, vec4 stc, float bias_scale, vec2 pos_screen)
+{
+ stc.xyz /= stc.w;
+ stc.z += spot_shadow_bias * bias_scale;
+ stc.x = floor(proj_shadow_res.x * stc.x + fract(pos_screen.y*0.666666666)) / proj_shadow_res.x; // snap
+
+ float cs = shadow2D(shadowMap, stc.xyz).x;
+ float shadow = cs;
+
+ vec2 off = 1.0/proj_shadow_res;
+ off.y *= 1.5;
+
+ shadow += shadow2D(shadowMap, stc.xyz+vec3(off.x*2.0, off.y, 0.0)).x;
+ shadow += shadow2D(shadowMap, stc.xyz+vec3(off.x, -off.y, 0.0)).x;
+ shadow += shadow2D(shadowMap, stc.xyz+vec3(-off.x, off.y, 0.0)).x;
+ shadow += shadow2D(shadowMap, stc.xyz+vec3(-off.x*2.0, -off.y, 0.0)).x;
+ return shadow*0.2;
+}
+
+float sampleDirectionalShadow(vec3 pos, vec3 norm, vec2 pos_screen)
+{
+ float shadow = 0.0f;
+ vec3 light_dir = normalize((sun_up_factor == 1) ? sun_dir : moon_dir);
+
+ float dp_directional_light = max(0.0, dot(norm.xyz, light_dir));
+ dp_directional_light = clamp(dp_directional_light, 0.0, 1.0);
+
+ vec3 shadow_pos = pos.xyz;
+
+ vec3 offset = light_dir.xyz * (1.0 - dp_directional_light);
+
+ shadow_pos += offset * shadow_offset * 2.0;
+
+ vec4 spos = vec4(shadow_pos.xyz, 1.0);
+
+ if (spos.z > -shadow_clip.w)
+ {
+ vec4 lpos;
+ vec4 near_split = shadow_clip*-0.75;
+ vec4 far_split = shadow_clip*-1.25;
+ vec4 transition_domain = near_split-far_split;
+ float weight = 0.0;
+
+ if (spos.z < near_split.z)
+ {
+ lpos = shadow_matrix[3]*spos;
+
+ float w = 1.0;
+ w -= max(spos.z-far_split.z, 0.0)/transition_domain.z;
+ //w = clamp(w, 0.0, 1.0);
+ float contrib = pcfShadow(shadowMap3, norm, lpos, 1.0, pos_screen, light_dir)*w;
+ //if (contrib > 0)
+ {
+ shadow += contrib;
+ weight += w;
+ }
+ shadow += max((pos.z+shadow_clip.z)/(shadow_clip.z-shadow_clip.w)*2.0-1.0, 0.0);
+ }
+
+ if (spos.z < near_split.y && spos.z > far_split.z)
+ {
+ lpos = shadow_matrix[2]*spos;
+
+ float w = 1.0;
+ w -= max(spos.z-far_split.y, 0.0)/transition_domain.y;
+ w -= max(near_split.z-spos.z, 0.0)/transition_domain.z;
+ //w = clamp(w, 0.0, 1.0);
+ float contrib = pcfShadow(shadowMap2, norm, lpos, 1.0, pos_screen, light_dir)*w;
+ //if (contrib > 0)
+ {
+ shadow += contrib;
+ weight += w;
+ }
+ }
+
+ if (spos.z < near_split.x && spos.z > far_split.y)
+ {
+ lpos = shadow_matrix[1]*spos;
+
+ float w = 1.0;
+ w -= max(spos.z-far_split.x, 0.0)/transition_domain.x;
+ w -= max(near_split.y-spos.z, 0.0)/transition_domain.y;
+ //w = clamp(w, 0.0, 1.0);
+ float contrib = pcfShadow(shadowMap1, norm, lpos, 1.0, pos_screen, light_dir)*w;
+ //if (contrib > 0)
+ {
+ shadow += contrib;
+ weight += w;
+ }
+ }
+
+ if (spos.z > far_split.x)
+ {
+ lpos = shadow_matrix[0]*spos;
+
+ float w = 1.0;
+ w -= max(near_split.x-spos.z, 0.0)/transition_domain.x;
+ //w = clamp(w, 0.0, 1.0);
+ float contrib = pcfShadow(shadowMap0, norm, lpos, 1.0, pos_screen, light_dir)*w;
+ //if (contrib > 0)
+ {
+ shadow += contrib;
+ weight += w;
+ }
+ }
+
+ shadow /= weight;
+ }
+ else
+ {
+ return 1.0f; // lit beyond the far split...
+ }
+ //shadow = min(dp_directional_light,shadow);
+ return shadow;
+}
+
+float sampleSpotShadow(vec3 pos, vec3 norm, int index, vec2 pos_screen)
+{
+ float shadow = 0.0f;
+ pos += norm * spot_shadow_offset;
+
+ vec4 spos = vec4(pos,1.0);
+ if (spos.z > -shadow_clip.w)
+ {
+ vec4 lpos;
+
+ vec4 near_split = shadow_clip*-0.75;
+ vec4 far_split = shadow_clip*-1.25;
+ vec4 transition_domain = near_split-far_split;
+ float weight = 0.0;
+
+ {
+ float w = 1.0;
+ w -= max(spos.z-far_split.z, 0.0)/transition_domain.z;
+
+ if (index == 0)
+ {
+ lpos = shadow_matrix[4]*spos;
+ shadow += pcfSpotShadow(shadowMap4, lpos, 0.8, spos.xy)*w;
+ }
+ else
+ {
+ lpos = shadow_matrix[5]*spos;
+ shadow += pcfSpotShadow(shadowMap5, lpos, 0.8, spos.xy)*w;
+ }
+ weight += w;
+ shadow += max((pos.z+shadow_clip.z)/(shadow_clip.z-shadow_clip.w)*2.0-1.0, 0.0);
+ }
+
+ shadow /= weight;
+ }
+ else
+ {
+ shadow = 1.0f;
+ }
+ return shadow;
+}
+
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