1 files changed, 7 insertions, 82 deletions

diff --git a/indra/newview/app_settings/shaders/class3/deferred/sunLightSSAOF.glsl b/indra/newview/app_settings/shaders/class3/deferred/sunLightSSAOF.glsl
index 58f3f2f91e..0870a80a32 100644
--- a/indra/newview/app_settings/shaders/class3/deferred/sunLightSSAOF.glsl
+++ b/indra/newview/app_settings/shaders/class3/deferred/sunLightSSAOF.glsl
@@ -68,81 +68,11 @@ uniform float shadow_offset;
 uniform float spot_shadow_bias;
 uniform float spot_shadow_offset;
 
-vec3 decode_normal (vec2 enc);
-
-vec4 getPosition(vec2 pos_screen)
-{
-	float depth = texture2DRect(depthMap, pos_screen.xy).r;
-	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;
-}
-
-vec2 getKern(int i)
-{
-	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;
-       
-	return kern[i];
-}
+vec4 getPosition(vec2 pos_screen);
+vec3 getNorm(vec2 pos_screen);
 
 //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;
-	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(getKern(i), noise_reflect);
-		vec3 samppos_world = getPosition(samppos_screen).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)
-		
-		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" 
-		float diffz_val = (diff.z > -1.0) ? 1.0 : 0.0;
-		points = points + diffz_val;
-	}
-		
-	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);
-}
+float calcAmbientOcclusion(vec4 pos, vec3 norm, pos_screen);
 
 float pcfShadow(sampler2DShadow shadowMap, vec4 stc, float scl, vec2 pos_screen)
 {
@@ -184,14 +114,9 @@ float pcfSpotShadow(sampler2DShadow shadowMap, vec4 stc, float scl, vec2 pos_scr
 
 void main() 
 {
-	vec2 pos_screen = vary_fragcoord.xy;
-	
-	//try doing an unproject here
-	
-	vec4 pos = getPosition(pos_screen);
-	
-	vec3 norm = texture2DRect(normalMap, pos_screen).xyz;
-	norm = decode_normal(norm.xy); // unpack norm
+	vec2 pos_screen = vary_fragcoord.xy;	
+	vec4 pos        = getPosition(pos_screen);
+	vec3 norm       = getNorm(pos_screen);
 		
 	/*if (pos.z == 0.0) // do nothing for sky *FIX: REMOVE THIS IF/WHEN THE POSITION MAP IS BEING USED AS A STENCIL
 	{
@@ -291,7 +216,7 @@ void main()
 	}
 	
 	frag_color[0] = shadow;
-	frag_color[1] = calcAmbientOcclusion(pos, norm);
+	frag_color[1] = calcAmbientOcclusion(pos, norm, pos_screen);
 	
 	spos = vec4(shadow_pos+norm*spot_shadow_offset, 1.0);