Method GL.glViewport()

Method glViewport

void glViewport(int x, int y, int width, int height)

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:

x_w=(x_nd+1)(width/2)+x

y_w=(y_nd+1)(height/2)+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.

Parameter x

Parameter y

Specify the lower left corner of the viewport rectangle, in pixels. The initial value is (0,0).

Parameter width

Parameter 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.

Throws

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.

See also

glDepthRange