De-duplicate deferred gbuffer access for getPosition/getNorm.

De-duplicate ambient occlusion shader code and move to new aoUtil.glsl

Split shared shadow tap funcs into shadowUtil.glsl

1 files changed, 191 insertions, 0 deletions

diff --git a/indra/newview/app_settings/shaders/class1/deferred/shadowUtil.glsl b/indra/newview/app_settings/shaders/class1/deferred/shadowUtil.glsl
new file mode 100644
index 0000000000..ae5cb7cbc1
--- /dev/null
+++ b/indra/newview/app_settings/shaders/class1/deferred/shadowUtil.glsl
@@ -0,0 +1,191 @@
+/** 
+ * @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 sampler2D       noiseMap;
+uniform sampler2DShadow shadowMap0;
+uniform sampler2DShadow shadowMap1;
+uniform sampler2DShadow shadowMap2;
+uniform sampler2DShadow shadowMap3;
+uniform sampler2DShadow shadowMap4;
+uniform sampler2DShadow shadowMap5;
+
+uniform float ssao_radius;
+uniform float ssao_max_radius;
+uniform float ssao_factor;
+uniform float ssao_factor_inv;
+
+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;
+
+uniform mat4 inv_proj;
+uniform vec2 screen_res;
+
+vec3 decode_normal(vec2 enc);
+
+float pcfShadow(sampler2DShadow shadowMap, vec4 stc, float bias_scale, vec2 pos_screen)
+{
+    stc.xyz /= stc.w;
+    stc.z += shadow_bias;
+        
+    stc.x = floor(stc.x*pos_screen.x + fract(stc.y*shadow_res.y*12345))/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;
+    shadow += shadow2D(shadowMap, stc.xyz+vec3(2.0/shadow_res.x, 1.5/shadow_res.y, 0.0)).x;
+    shadow += shadow2D(shadowMap, stc.xyz+vec3(1.0/shadow_res.x, -1.5/shadow_res.y, 0.0)).x;
+    shadow += shadow2D(shadowMap, stc.xyz+vec3(-1.0/shadow_res.x, 1.5/shadow_res.y, 0.0)).x;
+    shadow += shadow2D(shadowMap, stc.xyz+vec3(-2.0/shadow_res.x, -1.5/shadow_res.y, 0.0)).x;
+    return shadow*0.2;
+}
+
+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 dp_sun = max(0.0, dot(sun_dir.xyz, norm));
+    float dp_moon = max(0.0, dot(moon_dir.xyz, norm));
+    float dp_directional_light = max(dp_sun,dp_moon);
+          dp_directional_light = clamp(dp_directional_light, 0.0, 1.0);
+
+        vec3 light_dir = (dp_moon > dp_sun) ? moon_dir : sun_dir;
+    vec3 offset = light_dir * (1.0-dp_directional_light);
+    vec3 shadow_pos = pos.xyz + (offset * shadow_bias);
+
+    float shadow = 0.0f;
+    vec4 spos = vec4(shadow_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;
+
+        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;
+            shadow += pcfShadow(shadowMap3, lpos, 0.5, pos_screen)*w;
+            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;
+            shadow += pcfShadow(shadowMap2, lpos, 0.75, pos_screen)*w;
+            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;
+            shadow += pcfShadow(shadowMap1, lpos, 0.88, pos_screen)*w;
+            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;
+                
+            shadow += pcfShadow(shadowMap0, lpos, 1.0, pos_screen)*w;
+            weight += w;
+        }
+
+        shadow /= weight;
+    }
+    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;
+
+        {
+            lpos = shadow_matrix[4 + index]*spos;
+            float w = 1.0;
+            w -= max(spos.z-far_split.z, 0.0)/transition_domain.z;
+        
+            shadow += pcfSpotShadow((index == 0) ? shadowMap4 : 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;
+    }
+    return shadow;
+}
+