Flipped GrabScreenPos in Forward

Hey,
I'm having trouble to display depth texture on a plane in forward rendering.
It looks like it's flipped in Y, but I can't just flip the uv in Y because the position will be incorrect.
It works fine in deferred, only forward causes problem.

here's the shader code:

Code (CSharp):

1. Shader "Custom/Depth" {
2.     Properties {
3.         _Color ("Color", Color) = (1,1,1,1)
4.         _MainTex ("Albedo (RGB)", 2D) = "white" {}
5.         _InvFade ("Soft Particles Factor", Range(0.01,1)) = 1.0
6.     }
7.     SubShader {
8.         Tags { "Queue"="Transparent" "IgnoreProjector"="True" "RenderType"="Transparent" }
9.         Cull Off Lighting Off ZWrite Off
10.         Pass {
11.      
12.             CGPROGRAM
13.             #pragma vertex vert
14.             #pragma fragment frag
15.             #include "UnityCG.cginc"
16.          
17.             sampler2D_float _CameraDepthTexture;
18.             float _InvFade;
19.          
20.          
21.             struct appdata_t {
22.                 float4 vertex : POSITION;
23.             };
24.  
25.             struct v2f {
26.                 float4 vertex : SV_POSITION;
27.                 float4 projPos : TEXCOORD2;
28.  
29.             };
30.  
31.             v2f vert (appdata_t v)
32.             {
33.                 v2f o;
34.                 o.vertex = mul(UNITY_MATRIX_MVP, v.vertex);
35.                 o.projPos = ComputeGrabScreenPos(o.vertex);
36.                 COMPUTE_EYEDEPTH(o.projPos.z);
37.  
38.                 return o;
39.             }
40.  
41.             fixed4 frag (v2f i) : SV_Target
42.             {
43.  
44.                 float sceneZ = LinearEyeDepth (SAMPLE_DEPTH_TEXTURE_PROJ(_CameraDepthTexture, UNITY_PROJ_COORD(i.projPos)));
45.                 float partZ = i.projPos.z;
46.                 float depth = saturate (_InvFade * (sceneZ-partZ));
47.                  
48.              
49.                 return depth;
50.             }
51.             ENDCG
52.         }
53.     }
54. }

 

Also, this happens only in game view, always fine in scene view

 

You gotta flip the Y.

#if UNITY_UV_STARTS_AT_TOP
if (_MainTex_TexelSize.y < 0)
o.projPos..y = 1 - o.projPos.y;
#endif

 

yeah like I said this won't work because the position is not correct anymore.

 

Same issue here. This is a bug on forward renderer I think.

 

yes, I submitted a bug report and they said it's going to be fixed in 5.4 ...