Table of Contents
glViewport - set the viewport 
 
void glViewport( GLint
x, 
    GLint y,
    GLsizei width,
    GLsizei height )
 eqn not supported
- 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. 
glViewport
specifies the affine transformation of $x$ and $y$ from normalized device
coordinates to window coordinates. Let ($x sub nd$, $y sub nd$) be normalized
device coordinates. Then the window coordinates ($x sub w$, $y sub w$) are
computed as follows:
eqn not supported
eqn not supported
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. 
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.  
glGet with argument
GL_VIEWPORT 
glGet with argument GL_MAX_VIEWPORT_DIMS 
glDepthRange(3G)
 
Table of Contents