1 files changed, 11 insertions, 0 deletions
diff --git a/indra/newview/app_settings/shaders/class1/deferred/diffuseV.glsl b/indra/newview/app_settings/shaders/class1/deferred/diffuseV.glsl
index 3c026796c8..7e83389f6e 100755
--- a/indra/newview/app_settings/shaders/class1/deferred/diffuseV.glsl
+++ b/indra/newview/app_settings/shaders/class1/deferred/diffuseV.glsl
@@ -26,6 +26,13 @@
 uniform mat3 normal_matrix;
 uniform mat4 texture_matrix0;
 uniform mat4 modelview_projection_matrix;
+uniform bool invert_tex_y = false;
+const mat4 invTexM = mat4(
+  1, 0, 0, 0,
+  0,-1, 0, 0,
+  0, 0, 1, 0,
+  0, 0, 0, 1
+); 
 
 ATTRIBUTE vec3 position;
 ATTRIBUTE vec4 diffuse_color;
@@ -44,6 +51,10 @@ void main()
 	//transform vertex
 	gl_Position = modelview_projection_matrix * vec4(position.xyz, 1.0); 
 	vary_texcoord0 = (texture_matrix0 * vec4(texcoord0,0,1)).xy;
+  if(invert_tex_y) 
+	{
+		vary_texcoord0 = vec2(invTexM * vec4(vary_texcoord0,0,1)).xy;
+	}
 	
 	passTextureIndex();
 	vary_normal = normalize(normal_matrix * normal);