Gl.Viewport (gb.opengl)

Set the viewport.

Parameters

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

Gl.Viewport specifies the affine transformation of $\mathit{x}$ and $\mathit{y}$ from normalized device coordinates to window coordinates. Let $\left({\mathit{x}}_{\mathit{nd}},{\mathit{y}}_{\mathit{nd}}\right)$ be normalized device coordinates. Then the window coordinates $\left({\mathit{x}}_{\mathit{w}},{\mathit{y}}_{\mathit{w}}\right)$ are computed as follows:

Viewport width and height are silently clamped to a range that depends on the implementation. To query this range, call Gl.Get with argument Gl.MAX_VIEWPORT_DIMS.

Errors

Gl.INVALID_VALUE is generated if either width or height is negative.

Associated Gets

Gl.Get with argument Gl.VIEWPORT

Gl.Get with argument Gl.MAX_VIEWPORT_DIMS

See also

See original documentation on OpenGL website