glScissor

define the scissor box

function glScissor(int $x, int $y, int $width, int $height) : void

arguments

1. int $x Specify the lower left corner of the scissor box. Initially (0, 0).
2. int $y
3. int $width Specify the width and height of the scissor box. 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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