Gl.Scissor (gb.opengl)
Static Sub Scissor ( X As Integer, Y As Integer, Width As Integer, Height As Integer )
Define the scissor box.
Parameters
- x, y
-
Specify the lower left corner of the scissor box.
Initially (0, 0).
- width, height
-
Specify the width and height of the scissor box.
When a GL context is first attached to a window,
width and height are set to the dimensions of that
window.
Description
Gl.Scissor defines a rectangle, called the scissor box,
in window coordinates.
The first two arguments,
x and
y,
specify the lower left corner of the box.
width and
height specify the width and height of the box.
To enable and disable the scissor test, call
Gl.Enable and Gl.Disable with argument
Gl.SCISSOR_TEST. The test is initially disabled.
While the test is enabled, only pixels that lie within the scissor box
can be modified by drawing commands.
Window coordinates have integer values at the shared corners of
frame buffer pixels.
glScissor(0,0,1,1) allows modification of only the lower left
pixel in the window, and glScissor(0,0,0,0) doesn't allow
modification of any pixels in the window.
When the scissor test is disabled,
it is as though the scissor box includes the entire window.
Errors
Gl.INVALID_VALUE is generated if either
width or
height is negative.
Associated Gets
Gl.Get with argument Gl.SCISSOR_BOX
Gl.IsEnabled with argument Gl.SCISSOR_TEST
See also
See original documentation on OpenGL website