Regarding Smoothing in Spectrogram using Metal

Hey, I need to know how to use texture mapping for rendering a spectrogram in metal. As I need smoothens the spectrogram. In my current project I am using vertex based approach which results in blocky behaviour between each quad. I need to smooth across each qaud so that It will smoothly gradient over.

Regarding Smoothing in Spectrogram using Metal
 
 
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