I want to make an image scaling shader in OpenGL Shader Language... but I have no idea how to make it.

I want to implement either the HQx algorithm or an xBR variant.

My game engine is GameMaker: Studio 1.4.

  • 1
    \$\begingroup\$ I recommend starting with some tutorials and intro guides about writing shaders in GameMaker. A quick search turns up lots of leads. Once you're comfortable writing shaders in your tool set, you'll likely be able to solve this problem yourself, or ask a more focused question identifying a particular step in applying the algorithm as a shader that you're stuck on. \$\endgroup\$ – DMGregory Dec 31 '18 at 15:15

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