Im trying to convert this shader to hlsl, and make it usable to 3dgs, but im not sure if it will work, can someone who is a little more expirienced then me check it out to see if its even possible, right now im just trying to change the vec's to floats, setting up the sampler, and im trying to figure out how they are doing stuff.

GLSL to HLSL is a lot harder than it looks, good luck trying

Sure its possible, I have converted such shaders before...

However, this shader only appears to give you the pixel shader, and you need a vertex shader to go with it. There is a link on the page to a more complete implementation, just get that play around with it. However, sometimes its frusturating to convert such sahders, and often it wont seem to work.

Frankly i think Steep parrallax, relief mapping, etc are not so great as they are very slow.

yes, i just figure, if i have a detail slider bar that gives my client one more option for detail