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Adding extra space to texture for fragment shader


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Hi guys.

So I'm working on my first shader, which is a glow. Right now it sorta works but the issue is - when I put it on, say, PNG with some shape used as sprite - the shader only works on pixels that included in the PNG so I have to add empty space around shape so my glow doesn't get chopped once it reaches the edge of the texture. How do I allow for more space to be taken by the shader? Like programmatically add empty space around or something like that. I was thinking maybe it's the job for a vertex shader but since I'm a complete noob I can't really think of how to achieve that. I was hoping somebody here can share his knowledge, this seems like a pretty usual task needed for every filter that goes beyond shape's boundaries.

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