glViewport — set the viewport
Specify the lower left corner of the viewport rectangle, in pixels. The initial value is (0,0).
Specify the width and height of the viewport. When a GL context is first attached to a window,
height are set to the dimensions of that window.
glViewport specifies the affine transformation of and from normalized device coordinates to window coordinates. Let be normalized device coordinates. Then the window coordinates are computed as follows:
Viewport width and height are silently clamped to a range that depends on the implementation. To query this range, call glGet with argument
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