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Man Pages


Manual Reference Pages  -  GLVIEWPORT (3)

NAME

glViewport - set the viewport

CONTENTS

C Specification
Parameters
Description
Errors
Associated Gets
See Also

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 (xnd, ynd) be normalized device coordinates. Then the window coordinates (xw, yw) are computed as follows:

xw = (xnd+1)(width / 2) + x

yw = (ynd+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.

GL_INVALID_OPERATION is generated if glViewport is executed between the execution of glBegin and the corresponding execution of glEnd.

ASSOCIATED GETS

glGet with argument GL_VIEWPORT
glGet with argument GL_MAX_VIEWPORT_DIMS

SEE ALSO

glDepthRange
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GLVIEWPORT (-->)

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