MAINT-653 Fix for shadow acne at high altitudes

1 files changed, 18 insertions, 19 deletions

diff --git a/indra/newview/app_settings/shaders/class2/deferred/alphaF.glsl b/indra/newview/app_settings/shaders/class2/deferred/alphaF.glsl
index 08f6ec63fe..99bf03ceca 100644
--- a/indra/newview/app_settings/shaders/class2/deferred/alphaF.glsl
+++ b/indra/newview/app_settings/shaders/class2/deferred/alphaF.glsl
@@ -34,10 +34,10 @@ out vec4 frag_color;
 VARYING vec4 vertex_color;
 VARYING vec2 vary_texcoord0;
 
-uniform sampler2DRectShadow shadowMap0;
-uniform sampler2DRectShadow shadowMap1;
-uniform sampler2DRectShadow shadowMap2;
-uniform sampler2DRectShadow shadowMap3;
+uniform sampler2DShadow shadowMap0;
+uniform sampler2DShadow shadowMap1;
+uniform sampler2DShadow shadowMap2;
+uniform sampler2DShadow shadowMap3;
 uniform sampler2DRect depthMap;
 
 uniform mat4 shadow_matrix[6];
@@ -58,18 +58,21 @@ uniform float shadow_bias;
 
 uniform mat4 inv_proj;
 
-float pcfShadow(sampler2DRectShadow shadowMap, vec4 stc, float scl)
+float pcfShadow(sampler2DShadow shadowMap, vec4 stc, float scl)
 {
 	stc.xyz /= stc.w;
 	stc.z += shadow_bias;
-	
-	float cs = shadow2DRect(shadowMap, stc.xyz).x;
+		
+	float cs = shadow2D(shadowMap, stc.xyz).x;
 	float shadow = cs;
 
-	shadow += max(shadow2DRect(shadowMap, stc.xyz+vec3(scl, scl, 0.0)).x, cs);
-	shadow += max(shadow2DRect(shadowMap, stc.xyz+vec3(scl, -scl, 0.0)).x, cs);
-	shadow += max(shadow2DRect(shadowMap, stc.xyz+vec3(-scl, scl, 0.0)).x, cs);
-	shadow += max(shadow2DRect(shadowMap, stc.xyz+vec3(-scl, -scl, 0.0)).x, cs);
+	
+	vec2 off = scl/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;
 }
@@ -97,8 +100,7 @@ void main()
 		if (spos.z < near_split.z)
 		{
 			lpos = shadow_matrix[3]*spos;
-			lpos.xy *= shadow_res;
-
+			
 			float w = 1.0;
 			w -= max(spos.z-far_split.z, 0.0)/transition_domain.z;
 			shadow += pcfShadow(shadowMap3, lpos, 0.25)*w;
@@ -109,8 +111,7 @@ void main()
 		if (spos.z < near_split.y && spos.z > far_split.z)
 		{
 			lpos = shadow_matrix[2]*spos;
-			lpos.xy *= shadow_res;
-
+			
 			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;
@@ -121,8 +122,7 @@ void main()
 		if (spos.z < near_split.x && spos.z > far_split.y)
 		{
 			lpos = shadow_matrix[1]*spos;
-			lpos.xy *= shadow_res;
-
+			
 			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;
@@ -133,8 +133,7 @@ void main()
 		if (spos.z > far_split.x)
 		{
 			lpos = shadow_matrix[0]*spos;
-			lpos.xy *= shadow_res;
-				
+							
 			float w = 1.0;
 			w -= max(near_split.x-spos.z, 0.0)/transition_domain.x;