5.5 shader problem

Here's a simple shader. Which is originally used to render the emulation depth texture for Tango development. But this shader doesn't work like previous. I modified the shader to check the difference. I found that I apply the material with this shader to a simple cube.
The color in 5.4.x is light red. Instead, in 5.5.x is dark red. What leads to the difference? And how can I fix it? Thanks.

Code (csharp):

1.  
2. Shader "Custom/NewSurfaceShader" {
3.     SubShader
4.     {
5.         Tags{ "RenderType" = "Opaque" }
6.         LOD 100
7.  
8.         Pass
9.     {
10.         CGPROGRAM
11. #pragma vertex vert
12. #pragma fragment frag
13.  
14. #include "UnityCG.cginc"
15.  
16.         struct appdata
17.     {
18.         float4 vertex : POSITION;
19.     };
20.  
21.     struct v2f
22.     {
23.         float4 vertex : SV_POSITION;
24.         float clipSpaceZ : TEXCOORD0;
25.     };
26.  
27.     float4x4 _ModelToTangoDepthCameraSpace;
28.  
29.     v2f vert(appdata v)
30.     {
31.         v2f o;
32.         o.vertex = mul(UNITY_MATRIX_MVP, v.vertex);
33.         o.clipSpaceZ = o.vertex.z;
34.         return o;
35.     }
36.  
37.     float4 frag(v2f i) : SV_Target
38.     {
39.         return float4(i.vertex.z,0,0,1);
40.     //float biasedUnprojectedDepth = i.clipSpaceZ + 128;
41.     //
42.     //float isNegative = 0;
43.     //if(biasedUnprojectedDepth < 0)
44.     //{
45.     //    biasedUnprojectedDepth = biasedUnprojectedDepth * -1;
46.     //    isNegative = 1;
47.     //}
48.     //
49.     //float integerPart;
50.     //float fractionPart = modf(biasedUnprojectedDepth, integerPart);
51.     //
52.     //integerPart = saturate(integerPart / 255.0);
53.     //
54.     ////store integer part in red, and fraction in green.
55.     //return float4(integerPart, fractionPart, 0, 1);
56.     }
57.         ENDCG
58.     }
59.     }
60. }
61.  

 

And also it seems that the clipSpaceZ of v2f struct is not working any more in 5.5.x.

 

Could it be related to the "Shaders: Z-buffer float inverted" change?
https://docs.unity3d.com/550/Documentation/Manual/UpgradeGuide55.html

 

Thank you so much. It helps. And also the projection matrix of the camera is changed. But I can convert it to the original one.

 

The shader is fixed by the code below.

Code (csharp):

1.  
2. #if defined(UNITY_REVERSED_Z)
3.                 o.clipSpaceZ = UNITY_Z_0_FAR_FROM_CLIPSPACE(o.vertex.z);
4. #endif
5.  

But the projectionMatrix is not mentioned in the upgrade guide. I fixed the projectionMatrix by the code below. Is it right? Thank you.

Code (csharp):

1.  
2.             Matrix4x4 projectionMatrix = GL.GetGPUProjectionMatrix(EmulatedEnvironmentRenderHelper.m_emulationCamera.projectionMatrix, false);
3. #if UNITY_5_5
4.             projectionMatrix.m22 = -projectionMatrix.m22 - 1;
5.             projectionMatrix.m23 = -projectionMatrix.m23;
6. #endif
7.