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I am trying to get the Antialiasing (multisampling) in OpenGL with SDL to work(as shown here), but the result doesn't change and I still get jaggy edges.

Before rendering I call the following functions

glEnable(GL_MULTISAMPLE);
glHint(GL_LINE_SMOOTH_HINT, GL_NICEST );
glHint(GL_POLYGON_SMOOTH_HINT, GL_NICEST );
glEnable(GL_LINE_SMOOTH);
glEnable(GL_POLYGON_SMOOTH);

As I've been looking for a solution I added more functions to my SDL setup but nothing helped.

SDL_Init(SDL_INIT_EVERYTHING);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_FLAGS, 0);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 0);


SDL_GL_SetAttribute(SDL_GL_RED_SIZE, 8);
SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, 8);
SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, 8);
SDL_GL_SetAttribute(SDL_GL_ALPHA_SIZE, 8);
SDL_GL_SetAttribute(SDL_GL_BUFFER_SIZE, 32);
SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);

SDL_GL_SetAttribute(SDL_GL_MULTISAMPLEBUFFERS, 1);
SDL_GL_SetAttribute(SDL_GL_MULTISAMPLESAMPLES, 4);
        
SDL_SetHint( SDL_HINT_RENDER_SCALE_QUALITY, "1" );
SDL_GL_SetAttribute(SDL_GL_ACCELERATED_VISUAL, 1);

Window and Context are created via

window = SDL_CreateWindow(Window_title.str().c_str(), SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, width, height, flags);
SDL_GLContext glContext = SDL_GL_CreateContext(window);

Any Ideas what I could do to get around this? Should I try a different approach for anti-aliasing?

Have I missed something about Multisampling / anti-aliasing, like there's an extra fragment shader needed or so?

Image from my Game showing the aliased edges

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  • \$\begingroup\$ At best, multi-sampling will help only at the polygon edges. It won't do anything for the aliasing of individual texels in your nearest-neighbour filtered texture. So you'll want a different solution there, at minimum. \$\endgroup\$ Commented Apr 3, 2022 at 17:43
  • \$\begingroup\$ but I thought MSAA would at least smooth out the edges of the cubes... \$\endgroup\$ Commented Apr 3, 2022 at 18:12
  • \$\begingroup\$ @DMGregory♦ do you have any recommendations what technique I could use to get rid of the aliasing of the texels inside the texture? \$\endgroup\$ Commented Apr 3, 2022 at 18:33
  • \$\begingroup\$ This recent question links to a couple of such methods. \$\endgroup\$ Commented Apr 3, 2022 at 20:19

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