2 files changed, 22 insertions, 8 deletions
diff --git a/indra/newview/app_settings/shaders/class1/deferred/shadowAlphaMaskF.glsl b/indra/newview/app_settings/shaders/class1/deferred/shadowAlphaMaskF.glsl
index cf8cf8364a..bced4a5577 100644
--- a/indra/newview/app_settings/shaders/class1/deferred/shadowAlphaMaskF.glsl
+++ b/indra/newview/app_settings/shaders/class1/deferred/shadowAlphaMaskF.glsl
@@ -29,11 +29,11 @@ out vec4 frag_color;
 #define frag_color gl_FragColor
 #endif
 
-uniform float minimum_alpha;
-
 uniform sampler2D diffuseMap;
 
-VARYING vec4 post_pos;
+VARYING float pos_zd2;
+VARYING float pos_w;
+VARYING float target_pos_x;
 VARYING vec4 vertex_color;
 VARYING vec2 vary_texcoord0;
 
@@ -41,12 +41,20 @@ void main()
 {
 	float alpha = diffuseLookup(vary_texcoord0.xy).a * vertex_color.a;
 
-	if (alpha < minimum_alpha)
+	if (alpha < 0.05) // treat as totally transparent
 	{
 		discard;
 	}
 
+	if (alpha < 0.88) // treat as semi-transparent
+	{
+	  if (fract(0.5*floor(target_pos_x / pos_w )) < 0.25)
+	  {
+	    discard;
+	  }
+	}
+
 	frag_color = vec4(1,1,1,1);
 	
-	gl_FragDepth = max(post_pos.z/post_pos.w*0.5+0.5, 0.0);
+	gl_FragDepth = max(pos_zd2/pos_w+0.5, 0.0);
 }
diff --git a/indra/newview/app_settings/shaders/class1/deferred/shadowAlphaMaskV.glsl b/indra/newview/app_settings/shaders/class1/deferred/shadowAlphaMaskV.glsl
index 7d3b06c56e..c1f2d90712 100644
--- a/indra/newview/app_settings/shaders/class1/deferred/shadowAlphaMaskV.glsl
+++ b/indra/newview/app_settings/shaders/class1/deferred/shadowAlphaMaskV.glsl
@@ -25,12 +25,15 @@
 
 uniform mat4 texture_matrix0;
 uniform mat4 modelview_projection_matrix;
+uniform float shadow_target_width;
 
 ATTRIBUTE vec3 position;
 ATTRIBUTE vec4 diffuse_color;
 ATTRIBUTE vec2 texcoord0;
 
-VARYING vec4 post_pos;
+VARYING float pos_zd2;
+VARYING float pos_w;
+VARYING float target_pos_x;
 VARYING vec4 vertex_color;
 VARYING vec2 vary_texcoord0;
 
@@ -39,8 +42,11 @@ void passTextureIndex();
 void main()
 {
 	//transform vertex
-	vec4 pos = modelview_projection_matrix*vec4(position.xyz, 1.0);
-	post_pos = pos;
+	vec4 pre_pos = vec4(position.xyz, 1.0);
+	vec4 pos = modelview_projection_matrix * pre_pos;
+	target_pos_x = 0.5 * (shadow_target_width - 1.0) * pos.x;
+	pos_w = pos.w;
+	pos_zd2 = pos.z * 0.5;
 	
 	gl_Position = vec4(pos.x, pos.y, pos.w*0.5, pos.w);