GLVIEWPORT - Online Linux Manual Page

Section : 3G
NAME"glViewport − set the viewport
C SPECIFICATIONvoid glViewport( GLint x, GLint y, GLsizei width, GLsizei height )
PARAMETERSx, y  Specify the lower left corner of the viewport rectangle, in pixels. The initial value is (0,0). width, height  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.
DESCRIPTION­glViewport specifies the affine transformation of x and y from normalized device coordinates to window coordinates. Let (xnd, ynd) be normalized device coordinates. Then the window coordinates (xw, yw) are computed as follows: 0
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