texture_viewport(3G)

NAME

texture_viewport − specify a mapping area for subsequent texture_windows

SYNOPSIS

C Syntax:

void texture_viewport(fildes,s1,t1,s2,t2);
int fildes;
float s1,t1,s2,t2;

FORTRAN77 Syntax:

subroutine texture_viewport(fildes,s1,t1,s2,t2)
integer*4 fildes
real s1,t1,s2,t2

Pascal Syntax:

procedure texture_viewport(fildes:integer;
s1,t1,s2,t2:real);

DESCRIPTION

Input Parameters

fildes Integer file descriptor returned by gopen when an I/O path to a graphic device is opened.

s1,t1,s2,t2 Boundaries of the new viewport on a unit square.

Discussion

This procedure specifies the rectangle onto which the four coordinate values of texture_window map. texture_viewport is used to align a texture map with the given texture_window coordinates. Rendered repetitions of the texture map or values of the rendered texture map external to the texture_window coordinates are based on the entire texture map regardless of the texture_viewport settings.

If a value less than zero or greater than one is specified for any s or t coordinate, then an error is generated and the default values are used.

DEFAULTS

(s1,t1)=(0.0,0.0), (s2,t2)=(1.0,1.0)

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