Name
gl.Viewport -- set the viewport
Synopsis
gl.Viewport(x, y, width, height)
Function
gl.Viewport() 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:

 
xw = (xnd + 1) * (width / 2) + x
yw = (ynd + 1) * (height / 2) + y

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.

When a GL context is first attached to a window, width and height are set to the dimensions of that window.

Please consult an OpenGL reference manual for more information.

Inputs
x
specify the left corner of the viewport rectangle, in pixels; the initial value is 0
y
specify the lower corner of the viewport rectangle, in pixels; the initial value is 0
width
specify the width of the viewport
height
specify the height of the viewport
Errors
#GL_INVALID_VALUE is generated if either width or height is negative.

#GL_INVALID_OPERATION is generated if gl.Viewport() is executed between the execution of gl.Begin() and the corresponding execution of gl.End().

Associated gets
gl.Get() with argument #GL_VIEWPORT

gl.Get() with argument #GL_MAX_VIEWPORT_DIMS


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