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retrieve the location of a sample

function glGetMultisamplefv(int $pname, int $index, float &$val) : void
  1. int $pname Specifies the sample parameter name. pname must be GL_SAMPLE_POSITION.
  2. int $index Specifies the index of the sample whose position to query.
  3. float $val Specifies the address of an array to receive the position of the sample.


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