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glViewport

set the viewport

function glViewport(int $x, int $y, int $width, int $height) : void
arguments
  1. int $x Specify the lower left corner of the viewport rectangle, in pixels. The initial value is (0,0).
  2. int $y
  3. int $width Specify the width and height of the viewport. When a GL context is first attached to a window, width and height are set to the dimensions of that window.
  4. int $height
returns

void

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