merge

11 files changed, 1319 insertions, 53 deletions

diff --git a/indra/newview/app_settings/shaders/class2/deferred/edgeF.glsl b/indra/newview/app_settings/shaders/class2/deferred/edgeF.glsl
index 3155f3f929..30e1702e9f 100644
--- a/indra/newview/app_settings/shaders/class2/deferred/edgeF.glsl
+++ b/indra/newview/app_settings/shaders/class2/deferred/edgeF.glsl
@@ -22,7 +22,7 @@ uniform vec2 screen_res;
 
 float getDepth(vec2 pos_screen)
 {
-	float z = texture2DRect(depthMap, pos_screen.xy).a;
+	float z = texture2DRect(depthMap, pos_screen.xy).r;
 	z = z*2.0-1.0;
 	vec4 ndc = vec4(0.0, 0.0, z, 1.0);
 	vec4 p = inv_proj*ndc;
diff --git a/indra/newview/app_settings/shaders/class2/deferred/edgeMSF.glsl b/indra/newview/app_settings/shaders/class2/deferred/edgeMSF.glsl
new file mode 100644
index 0000000000..38100d1523
--- /dev/null
+++ b/indra/newview/app_settings/shaders/class2/deferred/edgeMSF.glsl
@@ -0,0 +1,74 @@
+/** 
+ * @file edgeF.glsl
+ *
+ * $LicenseInfo:firstyear=2007&license=viewerlgpl$
+ * $/LicenseInfo$
+ */
+ 
+#version 120
+
+#extension GL_ARB_texture_rectangle : enable
+#extension GL_ARB_texture_multisample : enable
+
+uniform sampler2DMS depthMap;
+uniform sampler2DMS normalMap;
+
+varying vec2 vary_fragcoord;
+
+uniform float depth_cutoff;
+uniform float norm_cutoff;
+
+uniform mat4 inv_proj;
+uniform vec2 screen_res;
+
+float getDepth(ivec2 pos_screen, int sample)
+{
+	float z = texelFetch(depthMap, pos_screen, sample).r;
+	z = z*2.0-1.0;
+	vec4 ndc = vec4(0.0, 0.0, z, 1.0);
+	vec4 p = inv_proj*ndc;
+	return p.z/p.w;
+}
+
+void main() 
+{
+	float e = 0;
+	
+	ivec2 itc = ivec2(vary_fragcoord.xy);
+
+	for (int i = 0; i < samples; i++)
+	{	
+		vec3 norm = texelFetch(normalMap, itc, i).xyz;
+		norm = vec3((norm.xy-0.5)*2.0,norm.z); // unpack norm
+		float depth = getDepth(itc, i);
+	
+		vec2 tc = vary_fragcoord.xy;
+	
+		int sc = 1;
+	
+		vec2 de;
+		de.x = (depth-getDepth(itc+ivec2(sc, sc),i)) + (depth-getDepth(itc+ivec2(-sc, -sc), i));
+		de.y = (depth-getDepth(itc+ivec2(-sc, sc),i)) + (depth-getDepth(itc+ivec2(sc, -sc), i));
+		de /= depth;
+		de *= de;
+		de = step(depth_cutoff, de);
+	
+		vec2 ne;
+		vec3 nexnorm = texelFetch(normalMap, itc+ivec2(-sc,-sc), i).rgb;
+		nexnorm = vec3((nexnorm.xy-0.5)*2.0,nexnorm.z); // unpack norm
+		ne.x = dot(nexnorm, norm);
+		vec3 neynorm = texelFetch(normalMap, itc+ivec2(sc,sc), i).rgb;
+		neynorm = vec3((neynorm.xy-0.5)*2.0,neynorm.z); // unpack norm
+		ne.y = dot(neynorm, norm);
+	
+		ne = 1.0-ne;
+	
+		ne = step(norm_cutoff, ne);
+
+		e += dot(de,de)+dot(ne,ne);
+	}
+
+	e /= samples;
+	
+	gl_FragColor.a = e;
+}
diff --git a/indra/newview/app_settings/shaders/class2/deferred/multiSpotLightF.glsl b/indra/newview/app_settings/shaders/class2/deferred/multiSpotLightF.glsl
index d6cd984ebe..de987b1233 100644
--- a/indra/newview/app_settings/shaders/class2/deferred/multiSpotLightF.glsl
+++ b/indra/newview/app_settings/shaders/class2/deferred/multiSpotLightF.glsl
@@ -91,7 +91,7 @@ vec4 texture2DLodAmbient(sampler2D projectionMap, vec2 tc, float lod)
 
 vec4 getPosition(vec2 pos_screen)
 {
-	float depth = texture2DRect(depthMap, pos_screen.xy).a;
+	float depth = texture2DRect(depthMap, pos_screen.xy).r;
 	vec2 sc = pos_screen.xy*2.0;
 	sc /= screen_res;
 	sc -= vec2(1.0,1.0);
diff --git a/indra/newview/app_settings/shaders/class2/deferred/multiSpotLightMSF.glsl b/indra/newview/app_settings/shaders/class2/deferred/multiSpotLightMSF.glsl
new file mode 100644
index 0000000000..c6f0ea2a5d
--- /dev/null
+++ b/indra/newview/app_settings/shaders/class2/deferred/multiSpotLightMSF.glsl
@@ -0,0 +1,244 @@
+/** 
+ * @file multiSpotLightF.glsl
+ *
+ * $LicenseInfo:firstyear=2007&license=viewerlgpl$
+ * $/LicenseInfo$
+ */
+
+#version 120
+
+#extension GL_ARB_texture_rectangle : enable
+#extension GL_ARB_texture_multisample : enable
+
+uniform sampler2DMS diffuseRect;
+uniform sampler2DMS specularRect;
+uniform sampler2DMS depthMap;
+uniform sampler2DMS normalMap;
+uniform sampler2DMS lightMap;
+uniform sampler2D noiseMap;
+uniform sampler2D lightFunc;
+uniform sampler2D projectionMap;
+
+uniform mat4 proj_mat; //screen space to light space
+uniform float proj_near; //near clip for projection
+uniform vec3 proj_p; //plane projection is emitting from (in screen space)
+uniform vec3 proj_n;
+uniform float proj_focus; //distance from plane to begin blurring
+uniform float proj_lod;  //(number of mips in proj map)
+uniform float proj_range; //range between near clip and far clip plane of projection
+uniform float proj_ambient_lod;
+uniform float proj_ambiance;
+uniform float near_clip;
+uniform float far_clip;
+
+uniform vec3 proj_origin; //origin of projection to be used for angular attenuation
+uniform float sun_wash;
+uniform int proj_shadow_idx;
+uniform float shadow_fade;
+
+varying vec4 vary_light;
+
+varying vec4 vary_fragcoord;
+uniform vec2 screen_res;
+
+uniform mat4 inv_proj;
+
+vec4 texture2DLodSpecular(sampler2D projectionMap, vec2 tc, float lod)
+{
+	vec4 ret = texture2DLod(projectionMap, tc, lod);
+	
+	vec2 dist = tc-vec2(0.5);
+	
+	float det = max(1.0-lod/(proj_lod*0.5), 0.0);
+	
+	float d = dot(dist,dist);
+		
+	ret *= min(clamp((0.25-d)/0.25, 0.0, 1.0)+det, 1.0);
+	
+	return ret;
+}
+
+vec4 texture2DLodDiffuse(sampler2D projectionMap, vec2 tc, float lod)
+{
+	vec4 ret = texture2DLod(projectionMap, tc, lod);
+	
+	vec2 dist = vec2(0.5) - abs(tc-vec2(0.5));
+	
+	float det = min(lod/(proj_lod*0.5), 1.0);
+	
+	float d = min(dist.x, dist.y);
+	
+	float edge = 0.25*det;
+		
+	ret *= clamp(d/edge, 0.0, 1.0);
+	
+	return ret;
+}
+
+vec4 texture2DLodAmbient(sampler2D projectionMap, vec2 tc, float lod)
+{
+	vec4 ret = texture2DLod(projectionMap, tc, lod);
+	
+	vec2 dist = tc-vec2(0.5);
+	
+	float d = dot(dist,dist);
+		
+	ret *= min(clamp((0.25-d)/0.25, 0.0, 1.0), 1.0);
+	
+	return ret;
+}
+
+
+vec4 getPosition(ivec2 pos_screen, int sample)
+{
+	float depth = texelFetch(depthMap, pos_screen, sample).r;
+	vec2 sc = vec2(pos_screen.xy)*2.0;
+	sc /= screen_res;
+	sc -= vec2(1.0,1.0);
+	vec4 ndc = vec4(sc.x, sc.y, 2.0*depth-1.0, 1.0);
+	vec4 pos = inv_proj * ndc;
+	pos /= pos.w;
+	pos.w = 1.0;
+	return pos;
+}
+
+void main() 
+{
+	int wght = 0;
+
+	vec3 fcol = vec3(0,0,0);
+
+	vec2 frag = (vary_fragcoord.xy*0.5+0.5)*screen_res;
+	
+	ivec2 itc = ivec2(frag.xy);
+
+	for (int i = 0; i < samples; i++)
+	{
+		vec3 pos = getPosition(itc, i).xyz;
+		vec3 lv = vary_light.xyz-pos.xyz;
+		float dist2 = dot(lv,lv);
+		dist2 /= vary_light.w;
+		if (dist2 <= 1.0)
+		{
+			float shadow = 1.0;
+	
+			if (proj_shadow_idx >= 0)
+			{
+				vec4 shd = texelFetch(lightMap, itc, i);
+				float sh[2];
+				sh[0] = shd.b;
+				sh[1] = shd.a;
+				shadow = min(sh[proj_shadow_idx]+shadow_fade, 1.0);
+			}
+	
+			vec3 norm = texelFetch(normalMap, itc, i).xyz;
+			norm = vec3((norm.xy-0.5)*2.0,norm.z); // unpack norm
+	
+			norm = normalize(norm);
+			float l_dist = -dot(lv, proj_n);
+	
+			vec4 proj_tc = (proj_mat * vec4(pos.xyz, 1.0));
+			if (proj_tc.z >= 0.0)
+			{
+				proj_tc.xyz /= proj_tc.w;
+	
+				float fa = gl_Color.a+1.0;
+				float dist_atten = min(1.0-(dist2-1.0*(1.0-fa))/fa, 1.0);
+				if (dist_atten > 0.0)
+				{
+					lv = proj_origin-pos.xyz;
+					lv = normalize(lv);
+					float da = dot(norm, lv);
+		
+					vec3 col = vec3(0,0,0);
+		
+					vec3 diff_tex = texelFetch(diffuseRect, itc, i).rgb;
+		
+					float noise = texture2D(noiseMap, frag.xy/128.0).b;
+					if (proj_tc.z > 0.0 &&
+						proj_tc.x < 1.0 &&
+						proj_tc.y < 1.0 &&
+						proj_tc.x > 0.0 &&
+						proj_tc.y > 0.0)
+					{
+						float lit = 0.0;
+						float amb_da = proj_ambiance;
+		
+						if (da > 0.0)
+						{
+							float diff = clamp((l_dist-proj_focus)/proj_range, 0.0, 1.0);
+							float lod = diff * proj_lod;
+			
+							vec4 plcol = texture2DLodDiffuse(projectionMap, proj_tc.xy, lod);
+		
+							vec3 lcol = gl_Color.rgb * plcol.rgb * plcol.a;
+			
+							lit = da * dist_atten * noise;
+			
+							col = lcol*lit*diff_tex*shadow;
+							amb_da += (da*0.5)*(1.0-shadow)*proj_ambiance;
+						}
+		
+						//float diff = clamp((proj_range-proj_focus)/proj_range, 0.0, 1.0);
+						vec4 amb_plcol = texture2DLodAmbient(projectionMap, proj_tc.xy, proj_lod);
+							
+						amb_da += (da*da*0.5+0.5)*proj_ambiance;
+				
+						amb_da *= dist_atten * noise;
+			
+						amb_da = min(amb_da, 1.0-lit);
+			
+						col += amb_da*gl_Color.rgb*diff_tex.rgb*amb_plcol.rgb*amb_plcol.a;
+					}
+	
+	
+					vec4 spec = texelFetch(specularRect, itc, i);
+					if (spec.a > 0.0)
+					{
+						vec3 ref = reflect(normalize(pos), norm);
+		
+						//project from point pos in direction ref to plane proj_p, proj_n
+						vec3 pdelta = proj_p-pos;
+						float ds = dot(ref, proj_n);
+		
+						if (ds < 0.0)
+						{
+							vec3 pfinal = pos + ref * dot(pdelta, proj_n)/ds;
+			
+							vec4 stc = (proj_mat * vec4(pfinal.xyz, 1.0));
+
+							if (stc.z > 0.0)
+							{
+								stc.xy /= stc.w;
+
+								float fatten = clamp(spec.a*spec.a+spec.a*0.5, 0.25, 1.0);
+				
+								stc.xy = (stc.xy - vec2(0.5)) * fatten + vec2(0.5);
+								
+								if (stc.x < 1.0 &&
+									stc.y < 1.0 &&
+									stc.x > 0.0 &&
+									stc.y > 0.0)
+								{
+									vec4 scol = texture2DLodSpecular(projectionMap, stc.xy, proj_lod-spec.a*proj_lod);
+									col += dist_atten*scol.rgb*gl_Color.rgb*scol.a*spec.rgb*shadow;
+								}
+							}
+						}
+					}
+
+					fcol += col;
+					wght++;
+				}
+			}
+		}
+	}
+	
+	if (wght <= 0)
+	{
+		discard;
+	}
+
+	gl_FragColor.rgb = fcol/wght;	
+	gl_FragColor.a = 0.0;
+}
diff --git a/indra/newview/app_settings/shaders/class2/deferred/softenLightF.glsl b/indra/newview/app_settings/shaders/class2/deferred/softenLightF.glsl
index 0160e84278..dfa1964142 100644
--- a/indra/newview/app_settings/shaders/class2/deferred/softenLightF.glsl
+++ b/indra/newview/app_settings/shaders/class2/deferred/softenLightF.glsl
@@ -71,7 +71,7 @@ vec4 getPosition_d(vec2 pos_screen, float depth)
 
 vec4 getPosition(vec2 pos_screen)
 { //get position in screen space (world units) given window coordinate and depth map
-	float depth = texture2DRect(depthMap, pos_screen.xy).a;
+	float depth = texture2DRect(depthMap, pos_screen.xy).r;
 	return getPosition_d(pos_screen, depth);
 }
 
@@ -258,7 +258,7 @@ vec3 scaleSoftClip(vec3 light)
 void main() 
 {
 	vec2 tc = vary_fragcoord.xy;
-	float depth = texture2DRect(depthMap, tc.xy).a;
+	float depth = texture2DRect(depthMap, tc.xy).r;
 	vec3 pos = getPosition_d(tc, depth).xyz;
 	vec3 norm = texture2DRect(normalMap, tc).xyz;
 	norm = vec3((norm.xy-0.5)*2.0,norm.z); // unpack norm
@@ -288,54 +288,8 @@ void main()
 		float sa = dot(refnormpersp, vary_light.xyz);
 		vec3 dumbshiny = vary_SunlitColor*scol_ambocc.r*texture2D(lightFunc, vec2(sa, spec.a)).a;
 
-		/*
-		// screen-space cheap fakey reflection map
-		//
-		vec3 refnorm = normalize(reflect(vec3(0,0,-1), norm.xyz));
-		depth -= 0.5; // unbias depth
-		// first figure out where we'll make our 2D guess from
-		vec2 ref2d = (0.25 * screen_res.y) * (refnorm.xy) * abs(refnorm.z) / depth;
-		// Offset the guess source a little according to a trivial
-		// checkerboard dither function and spec.a.
-		// This is meant to be similar to sampling a blurred version
-		// of the diffuse map.  LOD would be better in that regard.
-		// The goal of the blur is to soften reflections in surfaces
-		// with low shinyness, and also to disguise our lameness.
-		float checkerboard = floor(mod(tc.x+tc.y, 2.0)); // 0.0, 1.0
-		float checkoffset = (3.0 + (7.0*(1.0-spec.a)))*(checkerboard-0.5);
-		ref2d += vec2(checkoffset, checkoffset);
-		ref2d += tc.xy; // use as offset from destination
-		// Get attributes from the 2D guess point.
-		// We average two samples of diffuse (not of anything else) per
-		// pixel to try to reduce aliasing some more.
-		vec3 refcol = 0.5 * (texture2DRect(diffuseRect, ref2d + vec2(0.0, -checkoffset)).rgb +
-				     texture2DRect(diffuseRect, ref2d + vec2(-checkoffset, 0.0)).rgb);
-		float refdepth = texture2DRect(depthMap, ref2d).a;
-		vec3 refpos = getPosition_d(ref2d, refdepth).xyz;
-		float refshad = texture2DRect(lightMap, ref2d).r;
-		vec3 refn = texture2DRect(normalMap, ref2d).rgb;
-		refn = vec3((refn.xy-0.5)*2.0,refn.z); // unpack norm
-		refn = normalize(refn);
-		// figure out how appropriate our guess actually was
-		float refapprop = max(0.0, dot(-refnorm, normalize(pos - refpos)));
-		// darken reflections from points which face away from the reflected ray - our guess was a back-face
-		//refapprop *= step(dot(refnorm, refn), 0.0);
-		refapprop = min(refapprop, max(0.0, -dot(refnorm, refn))); // more conservative variant
-		// get appropriate light strength for guess-point
-		// reflect light direction to increase the illusion that
-		// these are reflections.
-		vec3 reflight = reflect(lightnorm.xyz, norm.xyz);
-		float reflit = min(max(dot(refn, reflight.xyz), 0.0), refshad);
-		// apply sun color to guess-point, dampen according to inappropriateness of guess
-		float refmod = min(refapprop, reflit);
-		vec3 refprod = vary_SunlitColor * refcol.rgb * refmod;
-		vec3 ssshiny = (refprod * spec.a);
-		ssshiny *= 0.3; // dampen it even more
-		*/
-		vec3 ssshiny = vec3(0,0,0);
-
 		// add the two types of shiny together
-		col += (ssshiny + dumbshiny) * spec.rgb;
+		col += dumbshiny * spec.rgb;
 	}
 	
 	col = atmosLighting(col);
diff --git a/indra/newview/app_settings/shaders/class2/deferred/softenLightMSF.glsl b/indra/newview/app_settings/shaders/class2/deferred/softenLightMSF.glsl
new file mode 100644
index 0000000000..71482d0c7b
--- /dev/null
+++ b/indra/newview/app_settings/shaders/class2/deferred/softenLightMSF.glsl
@@ -0,0 +1,306 @@
+/** 
+ * @file softenLightMSF.glsl
+ *
+ * $LicenseInfo:firstyear=2007&license=viewerlgpl$
+ * $/LicenseInfo$
+ */
+ 
+#version 120
+
+#extension GL_ARB_texture_rectangle : enable
+#extension GL_ARB_texture_multisample : enable
+
+uniform sampler2DMS diffuseRect;
+uniform sampler2DMS specularRect;
+uniform sampler2DMS normalMap;
+uniform sampler2DMS lightMap;
+uniform sampler2DMS depthMap;
+uniform sampler2D	  noiseMap;
+uniform samplerCube environmentMap;
+uniform sampler2D	  lightFunc;
+uniform vec3 gi_quad;
+
+uniform float blur_size;
+uniform float blur_fidelity;
+
+// Inputs
+uniform vec4 morphFactor;
+uniform vec3 camPosLocal;
+//uniform vec4 camPosWorld;
+uniform vec4 gamma;
+uniform vec4 lightnorm;
+uniform vec4 sunlight_color;
+uniform vec4 ambient;
+uniform vec4 blue_horizon;
+uniform vec4 blue_density;
+uniform vec4 haze_horizon;
+uniform vec4 haze_density;
+uniform vec4 cloud_shadow;
+uniform vec4 density_multiplier;
+uniform vec4 distance_multiplier;
+uniform vec4 max_y;
+uniform vec4 glow;
+uniform float scene_light_strength;
+uniform vec3 env_mat[3];
+uniform vec4 shadow_clip;
+uniform mat3 ssao_effect_mat;
+
+uniform mat4 inv_proj;
+uniform vec2 screen_res;
+
+varying vec4 vary_light;
+varying vec2 vary_fragcoord;
+
+vec3 vary_PositionEye;
+
+vec3 vary_SunlitColor;
+vec3 vary_AmblitColor;
+vec3 vary_AdditiveColor;
+vec3 vary_AtmosAttenuation;
+
+vec4 getPosition_d(vec2 pos_screen, float depth)
+{
+	vec2 sc = pos_screen.xy*2.0;
+	sc /= screen_res;
+	sc -= vec2(1.0,1.0);
+	vec4 ndc = vec4(sc.x, sc.y, 2.0*depth-1.0, 1.0);
+	vec4 pos = inv_proj * ndc;
+	pos /= pos.w;
+	pos.w = 1.0;
+	return pos;
+}
+
+vec3 getPositionEye()
+{
+	return vary_PositionEye;
+}
+vec3 getSunlitColor()
+{
+	return vary_SunlitColor;
+}
+vec3 getAmblitColor()
+{
+	return vary_AmblitColor;
+}
+vec3 getAdditiveColor()
+{
+	return vary_AdditiveColor;
+}
+vec3 getAtmosAttenuation()
+{
+	return vary_AtmosAttenuation;
+}
+
+
+void setPositionEye(vec3 v)
+{
+	vary_PositionEye = v;
+}
+
+void setSunlitColor(vec3 v)
+{
+	vary_SunlitColor = v;
+}
+
+void setAmblitColor(vec3 v)
+{
+	vary_AmblitColor = v;
+}
+
+void setAdditiveColor(vec3 v)
+{
+	vary_AdditiveColor = v;
+}
+
+void setAtmosAttenuation(vec3 v)
+{
+	vary_AtmosAttenuation = v;
+}
+
+void calcAtmospherics(vec3 inPositionEye, float ambFactor) {
+
+	vec3 P = inPositionEye;
+	setPositionEye(P);
+	
+	//(TERRAIN) limit altitude
+	if (P.y > max_y.x) P *= (max_y.x / P.y);
+	if (P.y < -max_y.x) P *= (-max_y.x / P.y);
+
+	vec3 tmpLightnorm = lightnorm.xyz;
+
+	vec3 Pn = normalize(P);
+	float Plen = length(P);
+
+	vec4 temp1 = vec4(0);
+	vec3 temp2 = vec3(0);
+	vec4 blue_weight;
+	vec4 haze_weight;
+	vec4 sunlight = sunlight_color;
+	vec4 light_atten;
+
+	//sunlight attenuation effect (hue and brightness) due to atmosphere
+	//this is used later for sunlight modulation at various altitudes
+	light_atten = (blue_density * 1.0 + vec4(haze_density.r) * 0.25) * (density_multiplier.x * max_y.x);
+		//I had thought blue_density and haze_density should have equal weighting,
+		//but attenuation due to haze_density tends to seem too strong
+
+	temp1 = blue_density + vec4(haze_density.r);
+	blue_weight = blue_density / temp1;
+	haze_weight = vec4(haze_density.r) / temp1;
+
+	//(TERRAIN) compute sunlight from lightnorm only (for short rays like terrain)
+	temp2.y = max(0.0, tmpLightnorm.y);
+	temp2.y = 1. / temp2.y;
+	sunlight *= exp( - light_atten * temp2.y);
+
+	// main atmospheric scattering line integral
+	temp2.z = Plen * density_multiplier.x;
+
+	// Transparency (-> temp1)
+	// ATI Bugfix -- can't store temp1*temp2.z*distance_multiplier.x in a variable because the ati
+	// compiler gets confused.
+	temp1 = exp(-temp1 * temp2.z * distance_multiplier.x);
+
+	//final atmosphere attenuation factor
+	setAtmosAttenuation(temp1.rgb);
+	
+	//compute haze glow
+	//(can use temp2.x as temp because we haven't used it yet)
+	temp2.x = dot(Pn, tmpLightnorm.xyz);
+	temp2.x = 1. - temp2.x;
+		//temp2.x is 0 at the sun and increases away from sun
+	temp2.x = max(temp2.x, .03);	//was glow.y
+		//set a minimum "angle" (smaller glow.y allows tighter, brighter hotspot)
+	temp2.x *= glow.x;
+		//higher glow.x gives dimmer glow (because next step is 1 / "angle")
+	temp2.x = pow(temp2.x, glow.z);
+		//glow.z should be negative, so we're doing a sort of (1 / "angle") function
+
+	//add "minimum anti-solar illumination"
+	temp2.x += .25;
+	
+	//increase ambient when there are more clouds
+	vec4 tmpAmbient = ambient + (vec4(1.) - ambient) * cloud_shadow.x * 0.5;
+	
+	/*  decrease value and saturation (that in HSV, not HSL) for occluded areas
+	 * // for HSV color/geometry used here, see http://gimp-savvy.com/BOOK/index.html?node52.html
+	 * // The following line of code performs the equivalent of:
+	 * float ambAlpha = tmpAmbient.a;
+	 * float ambValue = dot(vec3(tmpAmbient), vec3(0.577)); // projection onto <1/rt(3), 1/rt(3), 1/rt(3)>, the neutral white-black axis
+	 * vec3 ambHueSat = vec3(tmpAmbient) - vec3(ambValue);
+	 * tmpAmbient = vec4(RenderSSAOEffect.valueFactor * vec3(ambValue) + RenderSSAOEffect.saturationFactor *(1.0 - ambFactor) * ambHueSat, ambAlpha);
+	 */
+	tmpAmbient = vec4(mix(ssao_effect_mat * tmpAmbient.rgb, tmpAmbient.rgb, ambFactor), tmpAmbient.a);
+
+	//haze color
+	setAdditiveColor(
+		vec3(blue_horizon * blue_weight * (sunlight*(1.-cloud_shadow.x) + tmpAmbient)
+	  + (haze_horizon.r * haze_weight) * (sunlight*(1.-cloud_shadow.x) * temp2.x
+		  + tmpAmbient)));
+
+	//brightness of surface both sunlight and ambient
+	setSunlitColor(vec3(sunlight * .5));
+	setAmblitColor(vec3(tmpAmbient * .25));
+	setAdditiveColor(getAdditiveColor() * vec3(1.0 - temp1));
+}
+
+vec3 atmosLighting(vec3 light)
+{
+	light *= getAtmosAttenuation().r;
+	light += getAdditiveColor();
+	return (2.0 * light);
+}
+
+vec3 atmosTransport(vec3 light) {
+	light *= getAtmosAttenuation().r;
+	light += getAdditiveColor() * 2.0;
+	return light;
+}
+vec3 atmosGetDiffuseSunlightColor()
+{
+	return getSunlitColor();
+}
+
+vec3 scaleDownLight(vec3 light)
+{
+	return (light / scene_light_strength );
+}
+
+vec3 scaleUpLight(vec3 light)
+{
+	return (light * scene_light_strength);
+}
+
+vec3 atmosAmbient(vec3 light)
+{
+	return getAmblitColor() + light / 2.0;
+}
+
+vec3 atmosAffectDirectionalLight(float lightIntensity)
+{
+	return getSunlitColor() * lightIntensity;
+}
+
+vec3 scaleSoftClip(vec3 light)
+{
+	//soft clip effect:
+	light = 1. - clamp(light, vec3(0.), vec3(1.));
+	light = 1. - pow(light, gamma.xxx);
+
+	return light;
+}
+
+void main() 
+{
+	vec2 tc = vary_fragcoord.xy;
+	ivec2 itc = ivec2(tc);
+
+	vec3 fcol = vec3(0,0,0);
+
+	float amb = 0;
+
+	for (int i = 0; i < samples; ++i)
+	{
+		float depth = texelFetch(depthMap, itc.xy, i).r;
+		vec3 pos = getPosition_d(tc, depth).xyz;
+		vec3 norm = texelFetch(normalMap, itc, i).xyz;
+		norm = vec3((norm.xy-0.5)*2.0,norm.z); // unpack norm
+			
+		float da = max(dot(norm.xyz, vary_light.xyz), 0.0);
+	
+		vec4 diffuse = texelFetch(diffuseRect, itc, i);
+		vec4 spec = texelFetch(specularRect, itc, i);
+	
+		vec2 scol_ambocc = texelFetch(lightMap, itc, i).rg;
+		float scol = max(scol_ambocc.r, diffuse.a); 
+		float ambocc = scol_ambocc.g;
+		amb += ambocc;
+
+		calcAtmospherics(pos.xyz, ambocc);
+	
+		vec3 col = atmosAmbient(vec3(0));
+		col += atmosAffectDirectionalLight(max(min(da, scol), diffuse.a));
+	
+		col *= diffuse.rgb;
+	
+		if (spec.a > 0.0) // specular reflection
+		{
+			// the old infinite-sky shiny reflection
+			//
+			vec3 refnormpersp = normalize(reflect(pos.xyz, norm.xyz));
+			float sa = dot(refnormpersp, vary_light.xyz);
+			vec3 dumbshiny = vary_SunlitColor*scol_ambocc.r*texture2D(lightFunc, vec2(sa, spec.a)).a;
+
+			// add the two types of shiny together
+			col += dumbshiny * spec.rgb;
+		}
+	
+		col = atmosLighting(col);
+		col = scaleSoftClip(col);
+
+		fcol += col;
+	}
+		
+	gl_FragColor.rgb = fcol/samples; 
+	gl_FragColor.a = 0.0;
+}
diff --git a/indra/newview/app_settings/shaders/class2/deferred/spotLightMSF.glsl b/indra/newview/app_settings/shaders/class2/deferred/spotLightMSF.glsl
new file mode 100644
index 0000000000..099a45718a
--- /dev/null
+++ b/indra/newview/app_settings/shaders/class2/deferred/spotLightMSF.glsl
@@ -0,0 +1,245 @@
+/** 
+ * @file multiSpotLightF.glsl
+ *
+ * $LicenseInfo:firstyear=2007&license=viewerlgpl$
+ * $/LicenseInfo$
+ */
+
+#version 120
+
+#extension GL_ARB_texture_rectangle : enable
+#extension GL_ARB_texture_multisample : enable
+
+uniform sampler2DMS diffuseRect;
+uniform sampler2DMS specularRect;
+uniform sampler2DMS depthMap;
+uniform sampler2DMS normalMap;
+uniform sampler2DMS lightMap;
+uniform sampler2D noiseMap;
+uniform sampler2D lightFunc;
+uniform sampler2D projectionMap;
+
+uniform mat4 proj_mat; //screen space to light space
+uniform float proj_near; //near clip for projection
+uniform vec3 proj_p; //plane projection is emitting from (in screen space)
+uniform vec3 proj_n;
+uniform float proj_focus; //distance from plane to begin blurring
+uniform float proj_lod;  //(number of mips in proj map)
+uniform float proj_range; //range between near clip and far clip plane of projection
+uniform float proj_ambient_lod;
+uniform float proj_ambiance;
+uniform float near_clip;
+uniform float far_clip;
+
+uniform vec3 proj_origin; //origin of projection to be used for angular attenuation
+uniform float sun_wash;
+uniform int proj_shadow_idx;
+uniform float shadow_fade;
+
+varying vec4 vary_light;
+
+varying vec4 vary_fragcoord;
+uniform vec2 screen_res;
+
+uniform mat4 inv_proj;
+
+vec4 texture2DLodSpecular(sampler2D projectionMap, vec2 tc, float lod)
+{
+	vec4 ret = texture2DLod(projectionMap, tc, lod);
+	
+	vec2 dist = tc-vec2(0.5);
+	
+	float det = max(1.0-lod/(proj_lod*0.5), 0.0);
+	
+	float d = dot(dist,dist);
+		
+	ret *= min(clamp((0.25-d)/0.25, 0.0, 1.0)+det, 1.0);
+	
+	return ret;
+}
+
+vec4 texture2DLodDiffuse(sampler2D projectionMap, vec2 tc, float lod)
+{
+	vec4 ret = texture2DLod(projectionMap, tc, lod);
+	
+	vec2 dist = vec2(0.5) - abs(tc-vec2(0.5));
+	
+	float det = min(lod/(proj_lod*0.5), 1.0);
+	
+	float d = min(dist.x, dist.y);
+	
+	float edge = 0.25*det;
+		
+	ret *= clamp(d/edge, 0.0, 1.0);
+	
+	return ret;
+}
+
+vec4 texture2DLodAmbient(sampler2D projectionMap, vec2 tc, float lod)
+{
+	vec4 ret = texture2DLod(projectionMap, tc, lod);
+	
+	vec2 dist = tc-vec2(0.5);
+	
+	float d = dot(dist,dist);
+		
+	ret *= min(clamp((0.25-d)/0.25, 0.0, 1.0), 1.0);
+	
+	return ret;
+}
+
+
+vec4 getPosition(ivec2 pos_screen, int sample)
+{
+	float depth = texelFetch(depthMap, pos_screen, sample).r;
+	vec2 sc = vec2(pos_screen.xy)*2.0;
+	sc /= screen_res;
+	sc -= vec2(1.0,1.0);
+	vec4 ndc = vec4(sc.x, sc.y, 2.0*depth-1.0, 1.0);
+	vec4 pos = inv_proj * ndc;
+	pos /= pos.w;
+	pos.w = 1.0;
+	return pos;
+}
+
+void main() 
+{
+	vec4 frag = vary_fragcoord;
+	frag.xyz /= frag.w;
+	frag.xyz = frag.xyz*0.5+0.5;
+	frag.xy *= screen_res;
+	ivec2 itc = ivec2(frag.xy);
+	
+	vec3 fcol = vec3(0,0,0);
+	int wght = 0;
+
+	for (int i = 0; i < samples; i++)
+	{
+		vec3 pos = getPosition(itc, i).xyz;
+		vec3 lv = vary_light.xyz-pos.xyz;
+		float dist2 = dot(lv,lv);
+		dist2 /= vary_light.w;
+		if (dist2 <= 1.0)
+		{
+			float shadow = 1.0;
+	
+			if (proj_shadow_idx >= 0)
+			{
+				vec4 shd = texelFetch(lightMap, itc, i);
+				float sh[2];
+				sh[0] = shd.b;
+				sh[1] = shd.a;
+				shadow = min(sh[proj_shadow_idx]+shadow_fade, 1.0);
+			}
+	
+			vec3 norm = texelFetch(normalMap, itc, i).xyz;
+			norm = vec3((norm.xy-0.5)*2.0,norm.z); // unpack norm
+	
+			norm = normalize(norm);
+			float l_dist = -dot(lv, proj_n);
+	
+			vec4 proj_tc = (proj_mat * vec4(pos.xyz, 1.0));
+			if (proj_tc.z >= 0.0)
+			{
+				proj_tc.xyz /= proj_tc.w;
+	
+				float fa = gl_Color.a+1.0;
+				float dist_atten = min(1.0-(dist2-1.0*(1.0-fa))/fa, 1.0);
+				if (dist_atten > 0.0)
+				{
+					lv = proj_origin-pos.xyz;
+					lv = normalize(lv);
+					float da = dot(norm, lv);
+		
+					vec3 col = vec3(0,0,0);
+		
+					vec3 diff_tex = texelFetch(diffuseRect, itc, i).rgb;
+		
+					float noise = texture2D(noiseMap, frag.xy/128.0).b;
+					if (proj_tc.z > 0.0 &&
+						proj_tc.x < 1.0 &&
+						proj_tc.y < 1.0 &&
+						proj_tc.x > 0.0 &&
+						proj_tc.y > 0.0)
+					{
+						float lit = 0.0;
+						float amb_da = proj_ambiance;
+		
+						if (da > 0.0)
+						{
+							float diff = clamp((l_dist-proj_focus)/proj_range, 0.0, 1.0);
+							float lod = diff * proj_lod;
+			
+							vec4 plcol = texture2DLodDiffuse(projectionMap, proj_tc.xy, lod);
+		
+							vec3 lcol = gl_Color.rgb * plcol.rgb * plcol.a;
+			
+							lit = da * dist_atten * noise;
+			
+							col = lcol*lit*diff_tex*shadow;
+							amb_da += (da*0.5)*(1.0-shadow)*proj_ambiance;
+						}
+		
+						//float diff = clamp((proj_range-proj_focus)/proj_range, 0.0, 1.0);
+						vec4 amb_plcol = texture2DLodAmbient(projectionMap, proj_tc.xy, proj_lod);
+							
+						amb_da += (da*da*0.5+0.5)*proj_ambiance;
+				
+						amb_da *= dist_atten * noise;
+			
+						amb_da = min(amb_da, 1.0-lit);
+			
+						col += amb_da*gl_Color.rgb*diff_tex.rgb*amb_plcol.rgb*amb_plcol.a;
+					}
+	
+	
+					vec4 spec = texelFetch(specularRect, itc, i);
+					if (spec.a > 0.0)
+					{
+						vec3 ref = reflect(normalize(pos), norm);
+		
+						//project from point pos in direction ref to plane proj_p, proj_n
+						vec3 pdelta = proj_p-pos;
+						float ds = dot(ref, proj_n);
+		
+						if (ds < 0.0)
+						{
+							vec3 pfinal = pos + ref * dot(pdelta, proj_n)/ds;
+			
+							vec4 stc = (proj_mat * vec4(pfinal.xyz, 1.0));
+
+							if (stc.z > 0.0)
+							{
+								stc.xy /= stc.w;
+
+								float fatten = clamp(spec.a*spec.a+spec.a*0.5, 0.25, 1.0);
+				
+								stc.xy = (stc.xy - vec2(0.5)) * fatten + vec2(0.5);
+								
+								if (stc.x < 1.0 &&
+									stc.y < 1.0 &&
+									stc.x > 0.0 &&
+									stc.y > 0.0)
+								{
+									vec4 scol = texture2DLodSpecular(projectionMap, stc.xy, proj_lod-spec.a*proj_lod);
+									col += dist_atten*scol.rgb*gl_Color.rgb*scol.a*spec.rgb*shadow;
+								}
+							}
+						}
+					}
+
+					fcol += col;
+					wght++;
+				}
+			}
+		}
+	}
+	
+	if (wght <= 0)
+	{
+		discard;
+	}
+
+	gl_FragColor.rgb = fcol/wght;	
+	gl_FragColor.a = 0.0;
+}
diff --git a/indra/newview/app_settings/shaders/class2/deferred/sunLightF.glsl b/indra/newview/app_settings/shaders/class2/deferred/sunLightF.glsl
index 4369b3b34f..b724c134b9 100644
--- a/indra/newview/app_settings/shaders/class2/deferred/sunLightF.glsl
+++ b/indra/newview/app_settings/shaders/class2/deferred/sunLightF.glsl
@@ -45,7 +45,7 @@ uniform float spot_shadow_offset;
 
 vec4 getPosition(vec2 pos_screen)
 {
-	float depth = texture2DRect(depthMap, pos_screen.xy).a;
+	float depth = texture2DRect(depthMap, pos_screen.xy).r;
 	vec2 sc = pos_screen.xy*2.0;
 	sc /= screen_res;
 	sc -= vec2(1.0,1.0);
diff --git a/indra/newview/app_settings/shaders/class2/deferred/sunLightMSF.glsl b/indra/newview/app_settings/shaders/class2/deferred/sunLightMSF.glsl
new file mode 100644
index 0000000000..dd6fa958c9
--- /dev/null
+++ b/indra/newview/app_settings/shaders/class2/deferred/sunLightMSF.glsl
@@ -0,0 +1,202 @@
+/** 
+ * @file sunLightMSF.glsl
+ *
+ * $LicenseInfo:firstyear=2007&license=viewerlgpl$
+ * $/LicenseInfo$
+ */
+ 
+#version 120
+
+#extension GL_ARB_texture_rectangle : enable
+#extension GL_ARB_texture_multisample : enable
+
+//class 2, shadows, no SSAO
+
+uniform sampler2DMS depthMap;
+uniform sampler2DMS normalMap;
+uniform sampler2DRectShadow shadowMap0;
+uniform sampler2DRectShadow shadowMap1;
+uniform sampler2DRectShadow shadowMap2;
+uniform sampler2DRectShadow shadowMap3;
+uniform sampler2DShadow shadowMap4;
+uniform sampler2DShadow shadowMap5;
+
+
+// Inputs
+uniform mat4 shadow_matrix[6];
+uniform vec4 shadow_clip;
+uniform float ssao_radius;
+uniform float ssao_max_radius;
+uniform float ssao_factor;
+uniform float ssao_factor_inv;
+
+varying vec2 vary_fragcoord;
+varying vec4 vary_light;
+
+uniform mat4 inv_proj;
+uniform vec2 screen_res;
+uniform vec2 shadow_res;
+uniform vec2 proj_shadow_res;
+
+uniform float shadow_bias;
+uniform float shadow_offset;
+
+uniform float spot_shadow_bias;
+uniform float spot_shadow_offset;
+
+vec4 getPosition(ivec2 pos_screen, int sample)
+{
+	float depth = texelFetch(depthMap, pos_screen.xy, sample).r;
+	vec2 sc = vec2(pos_screen.xy)*2.0;
+	sc /= screen_res;
+	sc -= vec2(1.0,1.0);
+	vec4 ndc = vec4(sc.x, sc.y, 2.0*depth-1.0, 1.0);
+	vec4 pos = inv_proj * ndc;
+	pos /= pos.w;
+	pos.w = 1.0;
+	return pos;
+}
+
+float pcfShadow(sampler2DRectShadow shadowMap, vec4 stc, float scl)
+{
+	stc.xyz /= stc.w;
+	stc.z += shadow_bias*scl;
+	
+	float cs = shadow2DRect(shadowMap, stc.xyz).x;
+	float shadow = cs;
+
+	shadow += max(shadow2DRect(shadowMap, stc.xyz+vec3(1.5, 1.5, 0.0)).x, cs);
+	shadow += max(shadow2DRect(shadowMap, stc.xyz+vec3(1.5, -1.5, 0.0)).x, cs);
+	shadow += max(shadow2DRect(shadowMap, stc.xyz+vec3(-1.5, 1.5, 0.0)).x, cs);
+	shadow += max(shadow2DRect(shadowMap, stc.xyz+vec3(-1.5, -1.5, 0.0)).x, cs);
+			
+	return shadow/5.0;
+	
+	//return shadow;
+}
+
+float pcfShadow(sampler2DShadow shadowMap, vec4 stc, float scl)
+{
+	stc.xyz /= stc.w;
+	stc.z += spot_shadow_bias*scl;
+	
+	float cs = shadow2D(shadowMap, stc.xyz).x;
+	float shadow = cs;
+
+	vec2 off = 1.5/proj_shadow_res;
+	
+	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);
+	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;
+}
+
+void main() 
+{
+	vec2 pos_screen = vary_fragcoord.xy;
+	ivec2 itc = ivec2(pos_screen);
+
+	//try doing an unproject here
+	
+	vec4 fcol = vec4(0,0,0,0);
+
+	for (int i = 0; i < samples; i++)
+	{
+		vec4 pos = getPosition(itc, i);
+	
+		vec4 nmap4 = texelFetch(normalMap, itc, i);
+		nmap4 = vec4((nmap4.xy-0.5)*2.0,nmap4.z,nmap4.w); // unpack norm
+		float displace = nmap4.w;
+		vec3 norm = nmap4.xyz;
+	
+		/*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
+			return;
+		}*/
+	
+		float shadow = 1.0;
+		float dp_directional_light = max(0.0, dot(norm, vary_light.xyz));
+
+		vec3 shadow_pos = pos.xyz + displace*norm;
+		vec3 offset = vary_light.xyz * (1.0-dp_directional_light);
+	
+		vec4 spos = vec4(shadow_pos+offset*shadow_offset, 1.0);
+	
+		if (spos.z > -shadow_clip.w)
+		{	
+			if (dp_directional_light == 0.0)
+			{
+				// if we know this point is facing away from the sun then we know it's in shadow without having to do a squirrelly shadow-map lookup
+				shadow = 0.0;
+			}
+			else
+			{
+				vec4 lpos;
+			
+				if (spos.z < -shadow_clip.z)
+				{
+					lpos = shadow_matrix[3]*spos;
+					lpos.xy *= shadow_res;
+					shadow = pcfShadow(shadowMap3, lpos, 0.25);
+					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)
+				{
+					lpos = shadow_matrix[2]*spos;
+					lpos.xy *= shadow_res;
+					shadow = pcfShadow(shadowMap2, lpos, 0.5);
+				}
+				else if (spos.z < -shadow_clip.x)
+				{
+					lpos = shadow_matrix[1]*spos;
+					lpos.xy *= shadow_res;
+					shadow = pcfShadow(shadowMap1, lpos, 0.75);
+				}
+				else
+				{
+					lpos = shadow_matrix[0]*spos;
+					lpos.xy *= shadow_res;
+					shadow = pcfShadow(shadowMap0, lpos, 1.0);
+				}
+		
+				// 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
+				// the goal is to err on the side of most-shadow to fill-in shadow holes and reduce artifacting
+				shadow = min(shadow, dp_directional_light);
+			
+				//lpos.xy /= lpos.w*32.0;
+				//if (fract(lpos.x) < 0.1 || fract(lpos.y) < 0.1)
+				//{
+				//	shadow = 0.0;
+				//}
+			
+			}
+		}
+		else
+		{
+			// more distant than the shadow map covers
+			shadow = 1.0;
+		}
+	
+		fcol[0] += shadow;
+		fcol[1] += 1.0;
+
+		spos = vec4(shadow_pos+norm*spot_shadow_offset, 1.0);
+	
+		//spotlight shadow 1
+		vec4 lpos = shadow_matrix[4]*spos;
+		fcol[2] += pcfShadow(shadowMap4, lpos, 0.8); 
+	
+		//spotlight shadow 2
+		lpos = shadow_matrix[5]*spos;
+		fcol[3] += pcfShadow(shadowMap5, lpos, 0.8); 
+	}
+
+	gl_FragColor = fcol/samples;
+}
diff --git a/indra/newview/app_settings/shaders/class2/deferred/sunLightSSAOF.glsl b/indra/newview/app_settings/shaders/class2/deferred/sunLightSSAOF.glsl
index 847b36b1ac..68e18162f6 100644
--- a/indra/newview/app_settings/shaders/class2/deferred/sunLightSSAOF.glsl
+++ b/indra/newview/app_settings/shaders/class2/deferred/sunLightSSAOF.glsl
@@ -45,7 +45,7 @@ uniform float spot_shadow_offset;
 
 vec4 getPosition(vec2 pos_screen)
 {
-	float depth = texture2DRect(depthMap, pos_screen.xy).a;
+	float depth = texture2DRect(depthMap, pos_screen.xy).r;
 	vec2 sc = pos_screen.xy*2.0;
 	sc /= screen_res;
 	sc -= vec2(1.0,1.0);
diff --git a/indra/newview/app_settings/shaders/class2/deferred/sunLightSSAOMSF.glsl b/indra/newview/app_settings/shaders/class2/deferred/sunLightSSAOMSF.glsl
new file mode 100644
index 0000000000..d28741f945
--- /dev/null
+++ b/indra/newview/app_settings/shaders/class2/deferred/sunLightSSAOMSF.glsl
@@ -0,0 +1,241 @@
+/** 
+ * @file sunLightSSAOF.glsl
+ *
+ * Copyright (c) 2007-$CurrentYear$, Linden Research, Inc.
+ * $License$
+ */
+ 
+#version 120
+
+#extension GL_ARB_texture_rectangle : enable
+#extension GL_ARB_texture_multisample : enable
+
+//class 2 -- shadows and SSAO
+
+uniform sampler2DMS depthMap;
+uniform sampler2DMS normalMap;
+uniform sampler2DRectShadow shadowMap0;
+uniform sampler2DRectShadow shadowMap1;
+uniform sampler2DRectShadow shadowMap2;
+uniform sampler2DRectShadow shadowMap3;
+uniform sampler2DShadow shadowMap4;
+uniform sampler2DShadow shadowMap5;
+uniform sampler2D noiseMap;
+
+// Inputs
+uniform mat4 shadow_matrix[6];
+uniform vec4 shadow_clip;
+uniform float ssao_radius;
+uniform float ssao_max_radius;
+uniform float ssao_factor;
+uniform float ssao_factor_inv;
+
+varying vec2 vary_fragcoord;
+varying vec4 vary_light;
+
+uniform mat4 inv_proj;
+uniform vec2 screen_res;
+uniform vec2 shadow_res;
+uniform vec2 proj_shadow_res;
+
+uniform float shadow_bias;
+uniform float shadow_offset;
+
+uniform float spot_shadow_bias;
+uniform float spot_shadow_offset;
+
+vec4 getPosition(ivec2 pos_screen, int sample)
+{
+	float depth = texelFetch(depthMap, pos_screen, sample).r;
+	vec2 sc = vec2(pos_screen.xy)*2.0;
+	sc /= screen_res;
+	sc -= vec2(1.0,1.0);
+	vec4 ndc = vec4(sc.x, sc.y, 2.0*depth-1.0, 1.0);
+	vec4 pos = inv_proj * ndc;
+	pos /= pos.w;
+	pos.w = 1.0;
+	return pos;
+}
+
+//calculate decreases in ambient lighting when crowded out (SSAO)
+float calcAmbientOcclusion(vec4 pos, vec3 norm, int sample)
+{
+	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;
+	kern[1] = vec2(1.0, 0.0) * 0.250*0.250;
+	kern[2] = vec2(0.0, 1.0) * 0.375*0.375;
+	kern[3] = vec2(0.0, -1.0) * 0.500*0.500;
+	kern[4] = vec2(0.7071, 0.7071) * 0.625*0.625;
+	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;
+
+	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 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++)
+	{
+		ivec2 samppos_screen = ivec2(pos_screen + scale * reflect(kern[i], noise_reflect));
+		vec3 samppos_world = getPosition(samppos_screen, sample).xyz; 
+			
+		vec3 diff = pos_world - samppos_world;
+		float dist2 = dot(diff, diff);
+			
+		// assume each sample corresponds to an occluding sphere with constant radius, constant x-sectional area
+		// --> 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);
+			
+		// 'blocked' samples (significantly closer to camera relative to pos_world) are "no data", not "no occlusion" 
+		points = points + int(diff.z > -1.0);
+	}
+		
+	angle_hidden = min(ssao_factor*angle_hidden/float(points), 1.0);
+		
+	ret = (1.0 - (float(points != 0) * angle_hidden));
+	
+	return min(ret, 1.0);
+}
+
+float pcfShadow(sampler2DRectShadow shadowMap, vec4 stc, float scl)
+{
+	stc.xyz /= stc.w;
+	stc.z += shadow_bias*scl;
+	
+	float cs = shadow2DRect(shadowMap, stc.xyz).x;
+	float shadow = cs;
+
+	shadow += max(shadow2DRect(shadowMap, stc.xyz+vec3(1.5, 1.5, 0.0)).x, cs);
+	shadow += max(shadow2DRect(shadowMap, stc.xyz+vec3(1.5, -1.5, 0.0)).x, cs);
+	shadow += max(shadow2DRect(shadowMap, stc.xyz+vec3(-1.5, 1.5, 0.0)).x, cs);
+	shadow += max(shadow2DRect(shadowMap, stc.xyz+vec3(-1.5, -1.5, 0.0)).x, cs);
+			
+	return shadow/5.0;
+	
+	//return shadow;
+}
+
+float pcfShadow(sampler2DShadow shadowMap, vec4 stc, float scl)
+{
+	stc.xyz /= stc.w;
+	stc.z += spot_shadow_bias*scl;
+	
+	float cs = shadow2D(shadowMap, stc.xyz).x;
+	float shadow = cs;
+
+	vec2 off = 1.5/proj_shadow_res;
+	
+	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);
+	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;
+}
+
+void main() 
+{
+	vec2 pos_screen = vary_fragcoord.xy;
+	ivec2 itc = ivec2(pos_screen);
+	vec4 fcol = vec4(0,0,0,0);
+
+	for (int i = 0; i < samples; i++)
+	{
+		vec4 pos = getPosition(itc, i);
+	
+		vec4 nmap4 = texelFetch(normalMap, itc, i);
+		nmap4 = vec4((nmap4.xy-0.5)*2.0,nmap4.z,nmap4.w); // unpack norm
+		float displace = nmap4.w;
+		vec3 norm = nmap4.xyz;
+	
+		float shadow = 1.0;
+		float dp_directional_light = max(0.0, dot(norm, vary_light.xyz));
+
+		vec3 shadow_pos = pos.xyz + displace*norm;
+		vec3 offset = vary_light.xyz * (1.0-dp_directional_light);
+	
+		vec4 spos = vec4(shadow_pos+offset*shadow_offset, 1.0);
+	
+		if (spos.z > -shadow_clip.w)
+		{	
+			if (dp_directional_light == 0.0)
+			{
+				// if we know this point is facing away from the sun then we know it's in shadow without having to do a squirrelly shadow-map lookup
+				shadow = 0.0;
+			}
+			else
+			{
+				vec4 lpos;
+			
+				if (spos.z < -shadow_clip.z)
+				{
+					lpos = shadow_matrix[3]*spos;
+					lpos.xy *= shadow_res;
+					shadow = pcfShadow(shadowMap3, lpos, 0.25);
+					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)
+				{
+					lpos = shadow_matrix[2]*spos;
+					lpos.xy *= shadow_res;
+					shadow = pcfShadow(shadowMap2, lpos, 0.5);
+				}
+				else if (spos.z < -shadow_clip.x)
+				{
+					lpos = shadow_matrix[1]*spos;
+					lpos.xy *= shadow_res;
+					shadow = pcfShadow(shadowMap1, lpos, 0.75);
+				}
+				else
+				{
+					lpos = shadow_matrix[0]*spos;
+					lpos.xy *= shadow_res;
+					shadow = pcfShadow(shadowMap0, lpos, 1.0);
+				}
+		
+				// 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
+				// the goal is to err on the side of most-shadow to fill-in shadow holes and reduce artifacting
+				shadow = min(shadow, dp_directional_light);
+			
+			}
+		}
+		else
+		{
+			// more distant than the shadow map covers
+			shadow = 1.0;
+		}
+	
+		
+		fcol[0] += shadow;
+		fcol[1] += calcAmbientOcclusion(pos, norm, i);
+
+		spos.xyz = shadow_pos+offset*spot_shadow_offset;
+	
+		//spotlight shadow 1
+		vec4 lpos = shadow_matrix[4]*spos;
+		fcol[2] += pcfShadow(shadowMap4, lpos, 0.8); 
+	
+		//spotlight shadow 2
+		lpos = shadow_matrix[5]*spos;
+		fcol[3] += pcfShadow(shadowMap5, lpos, 0.8); 
+	}
+		
+	gl_FragColor = fcol / samples;
+}