glPointParameter

From OpenGL Reference
Jump to navigation Jump to search

Specify point parameters.

C Specification[edit]

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[edit]

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[edit]

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[edit]

 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[edit]

 glGet with argument GL_POINT_FADE_THRESHOLD_SIZE 

 glGet with argument GL_POINT_SPRITE_COORD_ORIGIN 


Version Support[edit]

 glPointParameterf  2.0+
 glPointParameterfv  2.0+
 glPointParameteri  2.0+
 glPointParameteriv  2.0+

See Also[edit]

 glPointSize 


Copyright[edit]

Copyright© 1991-2006 Silicon Graphics, Inc. Copyright© 2010-2014 Khronos Group. This document is licensed under the SGI Free Software B License. For details, see http://oss.sgi.com/projects/FreeB/.