MirBSD manpage: glScissor(3)

GLSCISSOR(3G)       UNIX Programmer's Manual        GLSCISSOR(3G)


     glScissor - define the scissor box


     void glScissor( GLint x,
                     GLint y,
                     GLsizei width,
                     GLsizei height )


     x, y Specify the lower left corner of the scissor box. Ini-
          tially (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.


     glScissor 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 glEnable and
     glDisable with argument GL_SCISSOR_TEST. The test is ini-
     tially disabled. While the test is enabled, only pixels that
     lie within the scissor box can be modified by drawing com-
     mands. 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 scis-
     sor box includes the entire window.


     GL_INVALID_VALUE is generated if either width or height is

     GL_INVALID_OPERATION is generated if glScissor is executed
     between the execution of glBegin and the corresponding exe-
     cution of glEnd.

MirBSD #10-current     Printed 2021-12-07                       1

GLSCISSOR(3G)       UNIX Programmer's Manual        GLSCISSOR(3G)


     glGet with argument GL_SCISSOR_BOX
     glIsEnabled with argument GL_SCISSOR_TEST


     glEnable(3G), glViewport(3G)

MirBSD #10-current     Printed 2021-12-07                       2

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