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ioslinemetal

iOS Metal line width

I would like to set the width of a line that I am drawing in Metal. I can set the size of a point with point_size as explained here.

But how does it work with lines?

Solution

  • Short answer would be there is no way to control line width in the same way as a point size in Metal. Even in OpenGL graphics API, the function to do this (which used to exist as gllinewidth function) is now deprecated.

    An option would be to draw the line as a quad (a box), with two triangles. This would let you control the width of the line.

    If you want to stick to the line primitive itself, for some particular reason, the equivalent OpenGL question has been asked on StackOverflow already as seen here. The shader can be simple translated to Metal shading API.