To make sure that the multisample buffers are created and available, use the following steps:

1. When creating your OpenGL window, you need to select an OpenGL context that supports MSAA. The following is how one would do so in GLFW:

glfwWindowHint(GLFW_SAMPLES, 8); 
... // Other settings 
window = glfwCreateWindow( WIN_WIDTH, WIN_HEIGHT, 
            "Window title", NULL, NULL ); 

2. To determine whether multisample buffers are available and how many samples per-pixel are actually being used, you can use the following code (or something similar):

GLint bufs, samples; 
glGetIntegerv(GL_SAMPLE_BUFFERS, &bufs); 
glGetIntegerv(GL_SAMPLES, &samples); 
printf("MSAA: buffers = %d samples = %dn", bufs, samples); 

3. To enable multisampling, use the following:

glEnable(GL_MULTISAMPLE); 

4. To disable multisampling, use the following:

glDisable(GL_MULTISAMPLE);