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GLVIEWPORT() GLVIEWPORT() NAME glViewport - set the viewport C SPECIFICATION void glViewport( GLint x, GLint y, GLsizei width, GLsizei height ) delim $$ PARAMETERS x, y Specify the lower left corner of the viewport rectangle, in pix- els. 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 di- mensions of that window. DESCRIPTION glViewport specifies the affine transformation of $x$ and $y$ from nor- malized device coordinates to window coordinates. Let ($x sub nd$, $y sub nd$) be normalized device coordinates. Then the window coordinates ($x sub w$, $y sub w$) are computed as follows: x sub w ~=~ ( x sub nd + 1 ) left ( "width" over 2 right ) ~+~ "x" y sub w ~=~ ( y sub nd + 1 ) left ( "height" over 2 right ) ~+~ "y" Viewport width and height are silently clamped to a range that depends on the implementation. To query this range, call glGet with argument GL_MAX_VIEWPORT_DIMS. ERRORS GL_INVALID_VALUE is generated if either width or height is negative. GL_INVALID_OPERATION is generated if glViewport is executed between the execution of glBegin and the corresponding execution of glEnd. ASSOCIATED GETS glGet with argument GL_VIEWPORT glGet with argument GL_MAX_VIEWPORT_DIMS SEE ALSO glDepthRange GLVIEWPORT()
NAME | C SPECIFICATION | PARAMETERS | DESCRIPTION | ERRORS | ASSOCIATED GETS | SEE ALSO
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