glPointParameter

3G

glPointParameter

specify point parameters

# C Specification

                    void glPointParameterf
                    GLenum pname
                    GLfloat param

                    void glPointParameteri
                    GLenum pname
                    GLint param

                    void glPointParameterfv
                    GLenum pname
                    const GLfloat * params

                    void glPointParameteriv
                    GLenum pname
                    const GLint * params

## Parameters

`pname`

- Specifies a single-valued point parameter. `GL_POINT_FADE_THRESHOLD_SIZE`, and `GL_POINT_SPRITE_COORD_ORIGIN` are accepted.

`param`

- For `glPointParameterf` and `glPointParameteri`, specifies the value that `pname` will be set to.

`params`

- For `glPointParameterfv` and `glPointParameteriv`, specifies a pointer to an array where the value or values to be assigned to `pname` are stored.

## Description

The following values are accepted for `pname`:

`GL_POINT_FADE_THRESHOLD_SIZE`

- `params` is a single floating-point value that specifies the threshold value to which point sizes are clamped if they exceed the specified value. The default value is 1.0.

`GL_POINT_SPRITE_COORD_ORIGIN`

- `params` is a single enum specifying the point sprite texture coordinate origin, either `GL_LOWER_LEFT` or `GL_UPPER_LEFT`. The default value is `GL_UPPER_LEFT`.

## Errors

`GL_INVALID_VALUE` is generated if the value specified for `GL_POINT_FADE_THRESHOLD_SIZE` is less than zero.

`GL_INVALID_ENUM` is generated If the value specified for `GL_POINT_SPRITE_COORD_ORIGIN` is not `GL_LOWER_LEFT` or `GL_UPPER_LEFT`.

## Associated Gets

glGet

with argument `GL_POINT_FADE_THRESHOLD_SIZE`

glGet

with argument `GL_POINT_SPRITE_COORD_ORIGIN`

## See Also

glPointSize

## Copyright

Copyright 1991-2006 Silicon Graphics, Inc. Copyright 2010-2013 Khronos Group. This document is licensed under the SGI Free Software B License. For details, see http://oss.sgi.com/projects/FreeB/.