Debug fragment shader on GTX 980m?

I have an opentk 4 application. My machine is an MSI with a GTX 980m. I’m having trouble with textures. Can NSight help me debug a simple fragment shader? My texture is a color gradient. And I’m using this single line of code in my fragment shader to pick a color. Is there a way to debug this? If I run NSight via Extensions->NSight-> Start CUDA Debugging (Legacy) it disconnects immediately upon startup.

out_Color = texture2D(u_Texture, v_TexCoordinate);