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glGetTexGen

Chapter 7

215

glGetTexGen

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

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