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Question - Code Using Shaders to Manipulate Tiles

C

Cheesefactory

Guest
Hello,

So I'm pretty new with shaders, and am wondering how to imput the coordinates of an individual pixel into the fragment shader for manipulation. I am looking to use this to manipulate a tile in-game.

For example, suppose I want the pixel 2 from the top and 3 from the left of a given tile to change color. How can I do this with a shader?

Please explain as if I were 5. Thank you!
 
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