I tried to flip the UVs of a sprite with a shader but it's glitching

Questions & Answers
1

154724-unity-rrqdvb7oqa.png
154724-unity-rrqdvb7oqa.png842×567 11.2 KB

Here’s my shader code:

Shader "Custom/Reverse"
{
	Properties
	{
		[PerRendererData] _MainTex("Sprite Texture", 2D) = "white" {}
		_Color("Tint", Color) = (1,1,1,1)
		[MaterialToggle] PixelSnap("Pixel snap", Float) = 0
	}
    SubShader
    {
		 Tags
		{
			"Queue" = "Transparent"
			"IgnoreProjector" = "True"
			"RenderType" = "Transparent"
			"PreviewType" = "Plane"
			"CanUseSpriteAtlas" = "True"
		}
        // No culling or depth
        Cull Off 
		ZWrite Off 
		ZTest Always

        Pass
        {
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag

            #include "UnityCG.cginc"

            struct appdata
            {
                float4 vertex : POSITION;
                float2 uv : TEXCOORD0;
            };

            struct v2f
            {
                float2 uv : TEXCOORD0;
                float4 vertex : SV_POSITION;
            };

            v2f vert (appdata v)
            {
                v2f o;
                o.vertex = UnityObjectToClipPos(v.vertex);
                o.uv.x = 1 - v.uv.x;
				o.uv.y = v.uv.y;
                return o;
            }

            sampler2D _MainTex;

            fixed4 frag (v2f i) : SV_Target
            {
                fixed4 col = tex2D(_MainTex, i.uv);
                // just invert the colors
                //col.rgb = 1 - col.rgb;
                return col;
            }
            ENDCG
        }
    }
}

It did manage to flip her, but as you can see everything around her is transferred her colors everywhere. Any idea as to why that’s happening?

2

So… it turns out there’s a shader command that goes as follows:

Blend SrcAlpha OneMinusSrcAlpha

This command tells the shader how each pixel will blend with the pixels beneath it.
I don’t know too much of details, but if you put this the other commands like Cull off, Zwrite Off, etc., transparency will now work with your shader!
I discovered this from this youtube video: Shaders 101 - Intro to Shaders - YouTube