merge

1 files changed, 102 insertions, 42 deletions

diff --git a/indra/newview/app_settings/shaders/class2/deferred/sunLightSSAOF.glsl b/indra/newview/app_settings/shaders/class2/deferred/sunLightSSAOF.glsl
index d53850b489..02075a7687 100644
--- a/indra/newview/app_settings/shaders/class2/deferred/sunLightSSAOF.glsl
+++ b/indra/newview/app_settings/shaders/class2/deferred/sunLightSSAOF.glsl
@@ -1,14 +1,35 @@
 /** 
  * @file sunLightSSAOF.glsl
- *
- * Copyright (c) 2007-$CurrentYear$, Linden Research, Inc.
- * $License$
+ * $LicenseInfo:firstyear=2007&license=viewerlgpl$
+ * 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
+ * $/LicenseInfo$
  */
  
-
-
 #extension GL_ARB_texture_rectangle : enable
 
+#ifdef DEFINE_GL_FRAGCOLOR
+out vec4 frag_color;
+#else
+#define frag_color gl_FragColor
+#endif
+
 //class 2 -- shadows and SSAO
 
 uniform sampler2DRect depthMap;
@@ -21,6 +42,7 @@ uniform sampler2DShadow shadowMap4;
 uniform sampler2DShadow shadowMap5;
 uniform sampler2D noiseMap;
 
+
 // Inputs
 uniform mat4 shadow_matrix[6];
 uniform vec4 shadow_clip;
@@ -29,13 +51,13 @@ uniform float ssao_max_radius;
 uniform float ssao_factor;
 uniform float ssao_factor_inv;
 
-varying vec2 vary_fragcoord;
-varying vec4 vary_light;
+VARYING vec2 vary_fragcoord;
 
 uniform mat4 inv_proj;
 uniform vec2 screen_res;
 uniform vec2 shadow_res;
 uniform vec2 proj_shadow_res;
+uniform vec3 sun_dir;
 
 uniform float shadow_bias;
 uniform float shadow_offset;
@@ -56,11 +78,8 @@ vec4 getPosition(vec2 pos_screen)
 	return pos;
 }
 
-//calculate decreases in ambient lighting when crowded out (SSAO)
-float calcAmbientOcclusion(vec4 pos, vec3 norm)
+vec2 getKern(int i)
 {
-	float ret = 1.0;
-
 	vec2 kern[8];
 	// exponentially (^2) distant occlusion samples spread around origin
 	kern[0] = vec2(-1.0, 0.0) * 0.125*0.125;
@@ -71,22 +90,30 @@ float calcAmbientOcclusion(vec4 pos, vec3 norm)
 	kern[5] = vec2(-0.7071, -0.7071) * 0.750*0.750;
 	kern[6] = vec2(-0.7071, 0.7071) * 0.875*0.875;
 	kern[7] = vec2(0.7071, -0.7071) * 1.000*1.000;
+	
+	return kern[i];
+}
+
+//calculate decreases in ambient lighting when crowded out (SSAO)
+float calcAmbientOcclusion(vec4 pos, vec3 norm)
+{
+	float ret = 1.0;
 
 	vec2 pos_screen = vary_fragcoord.xy;
 	vec3 pos_world = pos.xyz;
 	vec2 noise_reflect = texture2D(noiseMap, vary_fragcoord.xy/128.0).xy;
 		
 	float angle_hidden = 0.0;
-	int points = 0;
+	float points = 0;
 		
 	float scale = min(ssao_radius / -pos_world.z, ssao_max_radius);
-		
+	
 	// it was found that keeping # of samples a constant was the fastest, probably due to compiler optimizations (unrolling?)
 	for (int i = 0; i < 8; i++)
 	{
-		vec2 samppos_screen = pos_screen + scale * reflect(kern[i], noise_reflect);
+		vec2 samppos_screen = pos_screen + scale * reflect(getKern(i), noise_reflect);
 		vec3 samppos_world = getPosition(samppos_screen).xyz; 
-			
+		
 		vec3 diff = pos_world - samppos_world;
 		float dist2 = dot(diff, diff);
 			
@@ -94,17 +121,21 @@ float calcAmbientOcclusion(vec4 pos, vec3 norm)
 		// --> solid angle shrinking by the square of distance
 		//radius is somewhat arbitrary, can approx with just some constant k * 1 / dist^2
 		//(k should vary inversely with # of samples, but this is taken care of later)
-			
-		angle_hidden = angle_hidden + float(dot((samppos_world - 0.05*norm - pos_world), norm) > 0.0) * min(1.0/dist2, ssao_factor_inv);
+		
+		float funky_val = (dot((samppos_world - 0.05*norm - pos_world), norm) > 0.0) ? 1.0 : 0.0;
+		angle_hidden = angle_hidden + funky_val * min(1.0/dist2, ssao_factor_inv);
 			
 		// 'blocked' samples (significantly closer to camera relative to pos_world) are "no data", not "no occlusion" 
-		points = points + int(diff.z > -1.0);
+		float diffz_val = (diff.z > -1.0) ? 1.0 : 0.0;
+		points = points + diffz_val;
 	}
 		
-	angle_hidden = min(ssao_factor*angle_hidden/float(points), 1.0);
-		
-	ret = (1.0 - (float(points != 0) * angle_hidden));
+	angle_hidden = min(ssao_factor*angle_hidden/points, 1.0);
 	
+	float points_val = (points > 0.0) ? 1.0 : 0.0;
+	ret = (1.0 - (points_val * angle_hidden));
+
+	ret = max(ret, 0.0);
 	return min(ret, 1.0);
 }
 
@@ -141,7 +172,6 @@ float pcfShadow(sampler2DShadow shadowMap, vec4 stc, float scl)
 	shadow += max(shadow2D(shadowMap, stc.xyz+vec3(-off.x, off.y, 0.0)).x, cs);
 	shadow += max(shadow2D(shadowMap, stc.xyz+vec3(-off.x, -off.y, 0.0)).x, cs);
 	
-			
 	return shadow/5.0;
 	
 	//return shadow;
@@ -162,15 +192,15 @@ void main()
 	
 	/*if (pos.z == 0.0) // do nothing for sky *FIX: REMOVE THIS IF/WHEN THE POSITION MAP IS BEING USED AS A STENCIL
 	{
-		gl_FragColor = vec4(0.0); // doesn't matter
+		frag_color = vec4(0.0); // doesn't matter
 		return;
 	}*/
 	
-	float shadow = 1.0;
-	float dp_directional_light = max(0.0, dot(norm, vary_light.xyz));
+	float shadow = 0.0;
+	float dp_directional_light = max(0.0, dot(norm, sun_dir.xyz));
 
 	vec3 shadow_pos = pos.xyz + displace*norm;
-	vec3 offset = vary_light.xyz * (1.0-dp_directional_light);
+	vec3 offset = sun_dir.xyz * (1.0-dp_directional_light);
 	
 	vec4 spos = vec4(shadow_pos+offset*shadow_offset, 1.0);
 	
@@ -184,33 +214,63 @@ void main()
 		else
 		{
 			vec4 lpos;
-			
-			if (spos.z < -shadow_clip.z)
+
+			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;
 				lpos.xy *= shadow_res;
-				shadow = pcfShadow(shadowMap3, lpos, 0.25);
+
+				float w = 1.0;
+				w -= max(spos.z-far_split.z, 0.0)/transition_domain.z;
+				shadow += pcfShadow(shadowMap3, lpos, 0.25)*w;
+				weight += w;
 				shadow += max((pos.z+shadow_clip.z)/(shadow_clip.z-shadow_clip.w)*2.0-1.0, 0.0);
 			}
-			else if (spos.z < -shadow_clip.y)
+
+			if (spos.z < near_split.y && spos.z > far_split.z)
 			{
 				lpos = shadow_matrix[2]*spos;
 				lpos.xy *= shadow_res;
-				shadow = pcfShadow(shadowMap2, lpos, 0.5);
+
+				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)*w;
+				weight += w;
 			}
-			else if (spos.z < -shadow_clip.x)
+
+			if (spos.z < near_split.x && spos.z > far_split.y)
 			{
 				lpos = shadow_matrix[1]*spos;
 				lpos.xy *= shadow_res;
-				shadow = pcfShadow(shadowMap1, lpos, 0.75);
+
+				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, 0.75)*w;
+				weight += w;
 			}
-			else
+
+			if (spos.z > far_split.x)
 			{
 				lpos = shadow_matrix[0]*spos;
 				lpos.xy *= shadow_res;
-				shadow = pcfShadow(shadowMap0, lpos, 1.0);
+				
+				float w = 1.0;
+				w -= max(near_split.x-spos.z, 0.0)/transition_domain.x;
+				
+				shadow += pcfShadow(shadowMap0, lpos, 1.0)*w;
+				weight += w;
 			}
 		
+
+			shadow /= weight;
+
 			// take the most-shadowed value out of these two:
 			//  * the blurred sun shadow in the light (shadow) map
 			//  * an unblurred dot product between the sun and this norm
@@ -231,19 +291,19 @@ void main()
 		shadow = 1.0;
 	}
 	
-	gl_FragColor[0] = shadow;
-	gl_FragColor[1] = calcAmbientOcclusion(pos, norm);
+	frag_color[0] = shadow;
+	frag_color[1] = calcAmbientOcclusion(pos, norm);
 	
-	spos.xyz = shadow_pos+norm*spot_shadow_offset;
+	spos = vec4(shadow_pos+norm*spot_shadow_offset, 1.0);
 	
 	//spotlight shadow 1
 	vec4 lpos = shadow_matrix[4]*spos;
-	gl_FragColor[2] = pcfShadow(shadowMap4, lpos, 0.8); 
+	frag_color[2] = pcfShadow(shadowMap4, lpos, 0.8); 
 	
 	//spotlight shadow 2
 	lpos = shadow_matrix[5]*spos;
-	gl_FragColor[3] = pcfShadow(shadowMap5, lpos, 0.8); 
+	frag_color[3] = pcfShadow(shadowMap5, lpos, 0.8); 
 
-	//gl_FragColor.rgb = pos.xyz;
-	//gl_FragColor.b = shadow;
+	//frag_color.rgb = pos.xyz;
+	//frag_color.b = shadow;
 }