Sprite warping (or wraping?)

[System64]

Good work with drawing primitives :-)

For drawing filled circles, I once implemented it on a gfx library. I used bresenham's circle algorithm, but instead of directly plotting the edge pixels, I used them to fill an array of pairs of left/right edge values for each affected scanline. Then filled each scanline with solid color between its left and right edges and voila, filled circle.

This is very old MS-DOS Borland C source with the base algorithm, but you got the idea.
http://csourcecodes.blogspot.com/2016/06...ation.html

Thanks a lot for the sample and the algorithm! Both are pretty simple! I'll try to implement that.
This is the same principle for vertical warping and warping on both directions (but you need 4 sprites in this case).