New answers tagged hlsl
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Somewhere in your shader you'll have a declaration of your texture sampler, something like this:
sampler2D _MainTex; // This is the sampler.
float4 _MainTex_ST; // This is the scale/offset parameters set in the material widget.
Add one extra line below these:
float4 _MainTex_TexelSize;
This gives you a variable you can access in your shader, that Unity ...
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