GlViewport

_glViewport: set the viewport

Syntax

 SUB _glViewport (BYVAL x AS LONG, BYVAL y AS LONG, BYVAL width AS LONG, BYVAL height AS LONG)
 void _glViewport(GLint x, GLint y, GLsizei width, GLsizei height);

x, 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.

Description

_glViewport specifies the affine transformation of x and y from normalized device coordinates to window coordinates. Let (x_nd, y_nd) be normalized device coordinates. Then the window coordinates (x_w, y_w) are computed as follows:

Viewport width and height are silently clamped to a range that depends on the implementation. To query this range, call Template:KW with argument Template:KW.

Template:PageErrors

Template:KW is generated if either width or height is negative.

Template:PageUseWith

Template:KW with argument Template:KW

Template:KW with argument Template:KW

See also

SUB _GL Template:KW, Template:KW, Template:KW

Template:PageCopyright

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