Demo 73 - Triangle mosaic

Shader "Unlit/TriangleMosaic"
{
    Properties
    {
        _MainTex ("Texture", 2D) = "white" {}
        _TileNumX ("Tile number along X", float) = 0
        _TileNumY ("Tile number along Y", float) = 0
    }
    SubShader
    {
        Tags { "RenderType"="Opaque" }

        Pass
        {
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag

            #include "UnityCG.cginc"

            struct v2f
            {
                float4 pos : SV_POSITION;
                float4 screenuv : TEXCOORD1;
            };

            v2f vert (appdata_base v)
            {
                v2f o;
                o.pos = mul(UNITY_MATRIX_MVP, v.vertex);
                o.screenuv = ComputeScreenPos(o.pos);
                return o;
            }

            float _TileNumX;
            float _TileNumY;
            sampler2D _MainTex;

            fixed4 frag (v2f i) : SV_Target
            {
                float2 uv = i.screenuv.xy / i.screenuv.w;
                float2 TileNum = float2(_TileNumX, _TileNumY);
                float2 uv2 = floor(uv * TileNum) / TileNum;
                uv -= uv2;
                uv *= TileNum;

                fixed4 col = tex2D( _MainTex, uv2 + float2(step(1.0 - uv.y, uv.x) / (2.0 * _TileNumX),
                step(uv.x,uv.y)/(2.0 * _TileNumY)));

                return col;
            }
            ENDCG
        }
    }
}