Stefan Ullinger Hi, so here we go: GL_LINE_SMOOTH bad for business! ;) I checked the code within SDL_renderer_gl.c / GL_CreateRenderer(..) and have found the reason for blurred lines when using OpenGL. I have attached 2 images here. I don't know whether this has to be changed and I don't know if there is an option to turn it off/on...just wanted to say that with GL_LINE_SMOOTH enabled there is a difference when rendering with opengl compared to directx.

/*   SDLMain.m - main entry point for our Cocoa-ized SDL app
       Initial Version: Darrell Walisser <dwaliss1@purdue.edu>
       Non-NIB-Code & other changes: Max Horn <max@quendi.de>

    Feel free to customize this file to suit your needs
*/

#import <Cocoa/Cocoa.h>

@interface SDLMain : NSObject
{
    IBOutlet id _controller;
}
@end