glGetTexGen(3G) OpenGL Reference glGetTexGen(3G)NAME
glGetTexGendv, glGetTexGenfv, glGetTexGeniv - 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
Page 1
glGetTexGen(3G) OpenGL Reference glGetTexGen(3G)
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.
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
glTexGen
Page 2
