Texture Brush (Drawing Application ) Using Metal

Question

I am trying to implement a metal-backed drawing application where brushstrokes are drawn on an MTKView by textured square repeatedly along a finger position.

I am

Answer 1

I think you need to draw the brush squares to a separate texture, initially cleared to transparent, without blending. Then draw that whole texture to your view with blending.

If you draw the brush squares directly to the view, then they will accumulate. After you draw square 1, it's part of the image. Metal can no longer distinguish it from anything else that was already there. So, when you draw square 2 overlapping it, it will blend with what's already there, including square 1.