How to use "Hidden/BlitCopy" shader

Hi there,

I am trying to reproduce Blit (src, dest). But my test code fails:

Code (CSharp):

1. Shader shader = Shader.Find ("Hidden/BlitCopy");
2. Material material = new Material (shader);
3.  
4. commandBuffer.Blit (src, dest, material, 0);

What I am doing wrong?

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Another question should I use my own quad in order to use "Hidden/BlitCopy"? Ex.:

Code (CSharp):

1. Shader shader = Shader.Find ("Hidden/BlitCopy");
2. Material material = new Material (shader);
3.  
4. commandBuffer.SetGlobalTexture ("_MainTex", src);
5.  
6. commandBuffer.SetRenderTarget (dest);
7. commandBuffer.DrawMesh (quad, Matrix4x4.identity, material, 0, 0);

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Just everyone know the shader source Ill put this here:

Code (CSharp):

1. Shader "Hidden/BlitCopy" {
2.     Properties { _MainTex ("Texture", any) = "" {} }
3.     SubShader {
4.         Pass {
5.              ZTest Always Cull Off ZWrite Off
6.  
7.             CGPROGRAM
8.             #pragma vertex vert
9.             #pragma fragment frag
10.             #pragma target 2.0
11.  
12.             #include "UnityCG.cginc"
13.  
14.             sampler2D _MainTex;
15.             uniform float4 _MainTex_ST;
16.  
17.             struct appdata_t {
18.                 float4 vertex : POSITION;
19.                 float2 texcoord : TEXCOORD0;
20.             };
21.  
22.             struct v2f {
23.                 float4 vertex : SV_POSITION;
24.                 float2 texcoord : TEXCOORD0;
25.             };
26.  
27.             v2f vert (appdata_t v)
28.             {
29.                 v2f o;
30.                 o.vertex = UnityObjectToClipPos(v.vertex);
31.                 o.texcoord = TRANSFORM_TEX(v.texcoord.xy, _MainTex);
32.                 return o;
33.             }
34.  
35.             fixed4 frag (v2f i) : SV_Target
36.             {
37.                 return tex2D(_MainTex, i.texcoord);
38.             }
39.             ENDCG
40.  
41.         }
42.     }
43.     Fallback Off
44. }
45.  

 

UPDATE:

Well hello Aaron again
Found his post with the same issue at: https://forum.unity3d.com/threads/c...er-blit-with-internal_blitcopy-shader.432699/

Thanks to his workaround I found the solution to force _MainTex being declared:

Code (CSharp):

1. Shader shader = Shader.Find ("Hidden/BlitCopy");
2. Material material = new Material (shader);
3. commandBuffer.SetGlobalTexture ("_MainTex", src);
4. commandBuffer.Blit (src, dest, material, 0);

This IS the bug, as long as the Unity's documentation states the Blit source will be declared in _MainTex, which is not in this case.

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Now the question is how can I do this with the "quad" ?