glGenFramebuffers, glBindFramebuffer
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glGetMultisample: man4/glGetMultisample.xml
glGetMultisamplefv queries the location of a given sample. pname specifies the sample parameter to retrieve and must be GL_SAMPLE_POSITION. index corresponds to the sample for which the location should be returned. The sample location is returned as two floating-point values in val[0] and val[1], each between 0 and 1, corresponding to the x and y locations respectively in the GL pixel space of that sample. (0.5, 0.5) this corresponds to the pixel center. index must be between zero and the value of GL_SAMPLES minus one. If the multisample mode does not have fixed sample locations, the returned values may only reflect the locations of samples within some pixels.