08-16-2007
Maximum size of a file in unix
What's the maximum file size supported by unix.
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LEARN ABOUT XFREE86
glpointsize
GLPOINTSIZE(3G) GLPOINTSIZE(3G)
NAME
glPointSize - specify the diameter of rasterized points
C SPECIFICATION
void glPointSize( GLfloat size )
PARAMETERS
size Specifies the diameter of rasterized points. The initial value is 1.
DESCRIPTION
glPointSize specifies the rasterized diameter of both aliased and antialiased points. Using a point size other than 1 has different
effects, depending on whether point antialiasing is enabled. To enable and disable point antialiasing, call glEnable and glDisable with
argument GL_POINT_SMOOTH. Point antialiasing is initially disabled.
If point antialiasing is disabled, the actual size is determined by rounding the supplied size to the nearest integer. (If the rounding
results in the value 0, it is as if the point size were 1.) If the rounded size is odd, then the center point (x, y) of the pixel fragment
that represents the point is computed as
( |_xw_|+.5, |_yw_|+.5)
where w subscripts indicate window coordinates. All pixels that lie within the square grid of the rounded size centered at (x, y) make up
the fragment. If the size is even, the center point is
( |_xw+.5_|, |_yw+.5_|)
and the rasterized fragment's centers are the half-integer window coordinates within the square of the rounded size centered at (x, y).
All pixel fragments produced in rasterizing a nonantialiased point are assigned the same associated data, that of the vertex corresponding
to the point.
If antialiasing is enabled, then point rasterization produces a fragment for each pixel square that intersects the region lying within the
circle having diameter equal to the current point size and centered at the point's (xw, yw). The coverage value for each fragment is the
window coordinate area of the intersection of the circular region with the corresponding pixel square. This value is saved and used in the
final rasterization step. The data associated with each fragment is the data associated with the point being rasterized.
Not all sizes are supported when point antialiasing is enabled. If an unsupported size is requested, the nearest supported size is used.
Only size 1 is guaranteed to be supported; others depend on the implementation. To query the range of supported sizes and the size differ-
ence between supported sizes within the range, call glGet with arguments GL_SMOOTH_POINT_SIZE_RANGE and GL_SMOOTH_POINT_SIZE_GRANULARITY.
For aliased points, query the supported ranges and granularity with glGet with arguments GL_ALIASED_POINT_SIZE_RANGE and
GL_ALIASED_POINT_SIZE_GRANULARITY.
NOTES
The point size specified by glPointSize is always returned when GL_POINT_SIZE is queried. Clamping and rounding for aliased and
antialiased points have no effect on the specified value.
A non-antialiased point size may be clamped to an implementation-dependent maximum. Although this maximum cannot be queried, it must be no
less than the maximum value for antialiased points, rounded to the nearest integer value.
GL_POINT_SIZE_RANGE and GL_POINT_SIZE_GRANULARITY are deprecated in GL versions 1.2 and greater. Their functionality has been replaced by
GL_SMOOTH_POINT_SIZE_RANGE and GL_SMOOTH_POINT_SIZE_GRANULARITY.
ERRORS
GL_INVALID_VALUE is generated if size is less than or equal to 0.
GL_INVALID_OPERATION is generated if glPointSize is executed between the execution of glBegin and the corresponding execution of glEnd.
ASSOCIATED GETS
glGet with argument GL_POINT_SIZE
glGet with argument GL_ALIASED_POINT_SIZE_RANGE
glGet with argument GL_ALIASED_POINT_SIZE_GRANULARITY
glGet with argument GL_SMOOTH_POINT_SIZE_RANGE
glGet with argument GL_SMOOTH_POINT_SIZE_GRANULARITY
glIsEnabled with argument GL_POINT_SMOOTH
SEE ALSO
glEnable(3G)
GLPOINTSIZE(3G)