GLPOINTPARAMETER(3G) OpenGL 3.3 GLPOINTPARAMETER(3G)NAME
glPointParameter - specify point parameters
C SPECIFICATION
void glPointParameterf(GLenum pname, GLfloat param);
void glPointParameteri(GLenum pname, GLint param);
PARAMETERS
pname
Specifies a single-valued point parameter. GL_POINT_FADE_THRESHOLD_SIZE, and GL_POINT_SPRITE_COORD_ORIGIN are accepted.
param
Specifies the value that pname will be set to.
C SPECIFICATION
void glPointParameterfv(GLenum pname, const GLfloat * params);
void glPointParameteriv(GLenum pname, const GLint * params);
PARAMETERS
pname
Specifies a point parameter. GL_POINT_FADE_THRESHOLD_SIZE, and GL_POINT_SPRITE_COORD_ORIGIN are accepted.
params
Specifies the value to be assigned to pname..
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 (C) 1991-2006 Silicon Graphics, Inc. Copyright (C) 2010 Khronos Group. This document is licensed under the SGI Free Software B
License. For details, see http://oss.sgi.com/projects/FreeB/.
OpenGL 3.3 03/08/2011 GLPOINTPARAMETER(3G)
Check Out this Related Man Page
GLGETTEXGEN(3G) OpenGL Manual GLGETTEXGEN(3G)NAME
glGetTexGen - return texture coordinate generation parameters
C SPECIFICATION
void glGetTexGendv(GLenum coord, GLenum pname, GLdouble * params);
void glGetTexGenfv(GLenum coord, GLenum pname, GLfloat * params);
void glGetTexGeniv(GLenum coord, GLenum pname, GLint * params);
PARAMETERS
coord
Specifies a texture coordinate. Must be GL_S, GL_T, GL_R, or GL_Q.
pname
Specifies the symbolic name of the value(s) to be returned. Must be either GL_TEXTURE_GEN_MODE or the name of one of the texture
generation plane equations: GL_OBJECT_PLANE or GL_EYE_PLANE.
params
Returns the requested data.
DESCRIPTION
glGetTexGen returns in params selected parameters of a texture coordinate generation function that was specified using glTexGen(). coord
names one of the (s, t, r, q) texture coordinates, using the symbolic constant GL_S, GL_T, GL_R, or GL_Q.
pname specifies one of three symbolic names:
GL_TEXTURE_GEN_MODE
params returns the single-valued texture generation function, a symbolic constant. The initial value is GL_EYE_LINEAR.
GL_OBJECT_PLANE
params returns the four plane equation coefficients that specify object linear-coordinate generation. Integer values, when requested,
are mapped directly from the internal floating-point representation.
GL_EYE_PLANE
params returns the four plane equation coefficients that specify eye linear-coordinate generation. Integer values, when requested, are
mapped directly from the internal floating-point representation. The returned values are those maintained in eye coordinates. They are
not equal to the values specified using glTexGen(), unless the modelview matrix was identity when glTexGen() was called.
NOTES
If an error is generated, no change is made to the contents of params.
For OpenGL versions 1.3 and greater, or when the ARB_multitexture extension is supported, glGetTexGen returns the texture coordinate
generation parameters for the active texture unit.
ERRORS
GL_INVALID_ENUM is generated if coord or pname is not an accepted value.
GL_INVALID_OPERATION is generated if glGetTexGen is executed between the execution of glBegin() and the corresponding execution of glEnd().
SEE ALSO
glActiveTexture(), glTexGen()
COPYRIGHT
Copyright (C) 1991-2006 Silicon Graphics, Inc. This document is licensed under the SGI Free Software B License. For details, see
http://oss.sgi.com/projects/FreeB/.
AUTHORS
opengl.org
opengl.org 06/10/2014 GLGETTEXGEN(3G)