Tiling not working on iOS

Hey

My CG shaders often ignore tiling, when running on iOS. They act, as If the material's tiling property was set to 1, 1. What am I doing wrong?

Here is an example for a shader, which does not tile properly:

Code (csharp):

1. Shader "CS/Textured Vertex Colored Blended" {
2. Properties {
3.     _MainTex ("Base (RGB) Gloss (A)", 2D) = "white" {}
4.     }
5.  
6.  
7.     SubShader {
8.         Tags { "RenderType"="Transparent" "Queue"="Transparent"}
9.         Blend SrcAlpha OneMinusSrcAlpha
10.         ZWrite Off
11.         Pass {
12.             Name "BASE"
13.            
14.             CGPROGRAM
15.             #pragma vertex vert
16.             #pragma fragment frag
17.             #pragma fragmentoption ARB_precision_hint_fastest
18.             #include "UnityCG.cginc"
19.  
20.             sampler2D _MainTex;
21.  
22.             struct appdata {
23.                 fixed4 vertex : POSITION;
24.                 fixed4 color : COLOR;
25.                 float2 texcoord : TEXCOORD0;
26.             };
27.            
28.             fixed4 _MainTex_ST;
29.            
30.             struct v2f {
31.                 fixed4 pos : POSITION;
32.                 fixed4 color : COLOR;
33.                 float2 texcoord : TEXCOORD0;
34.             };
35.  
36.             v2f vert (appdata v)
37.             {
38.                 v2f o;
39.                 o.pos = mul (UNITY_MATRIX_MVP, v.vertex);
40.                 o.texcoord = TRANSFORM_TEX(v.texcoord, _MainTex);
41.                 o.color = v.color;
42.                 return o;
43.             }
44.  
45.             fixed4 frag (v2f i) : COLOR
46.             {
47.                 fixed4 col = i.color * tex2D(_MainTex, i.texcoord);
48.                 return col;
49.             }
50.             ENDCG          
51.         }
52.     }
53.  
54.    
55.     Fallback "VertexLit"
56. }
57.  

 

Set

Code (csharp):

1.  fixed4 _MainTex_ST;

to

Code (csharp):

1. float4 _MainTex_ST;

and it will work.

 

You're right, problem solved.
Thank you!

 

If something is not running on the device always check for a precision error first.

I think this problem should not occur on a 5S and iPad Air so always test on all target generations.