glViewport.3G - Man Page
set the viewport
C Specification
void glViewport(GLint x, GLint y, GLsizei width, GLsizei height);
Parameters
- x, y
Specify the lower left corner of the viewport rectangle, in pixels. The initial value is (0,0).
- width, 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.
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.
Errors
GL_INVALID_VALUE is generated if either width or height is negative.
Associated Gets
glGet() with argument GL_VIEWPORT
glGet() with argument GL_MAX_VIEWPORT_DIMS
Version Support
OpenGL Version | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Function / Feature Name | 2.0 | 2.1 | 3.0 | 3.1 | 3.2 | 3.3 | 4.0 | 4.1 | 4.2 | 4.3 | 4.4 | 4.5 |
glViewport | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ |
See Also
Copyright
Copyright © 1991-2006 Silicon Graphics, Inc. Copyright © 2010-2014 Khronos Group. This document is licensed under the SGI Free Software B License. For details, see http://oss.sgi.com/projects/FreeB/.
Copyright
Copyright © 1991-2006 Silicon Graphics, Inc.
Copyright © 2010-2014 Khronos Group
Referenced By
glDepthRange.3G(3), glDepthRangeArray.3G(3), glDepthRangeIndexed.3G(3), glFrustum.3G(3), glOrtho.3G(3), glPushMatrix.3G(3), glScissor.3G(3), glScissorArray.3G(3), glViewportArray.3G(3), glViewportIndexed.3G(3).