MirOS Manual: glGetTexGen(3), glGetTexGendv(3), glGetTexGenfv(3), glGetTexGeniv(3)


GLGETTEXGEN(3G)     UNIX Programmer's Manual      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 equa-
             tions: GL_OBJECT_PLANE or GL_EYE_PLANE.

     params  Returns the requested data.

DESCRIPTION

     glGetTexGen returns in params selected parameters of a tex-
     ture coordinate generation function that was specified using
     glTexGen. coord names one of the (s, t, r, q) texture coor-
     dinates, 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

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GLGETTEXGEN(3G)     UNIX Programmer's Manual      GLGETTEXGEN(3G)

                                 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.

     When the GL_ARB_multitexture extension is supported,
     glGetTexGen returns the texture coordinate generation param-
     eters 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 exe-
     cution of glEnd.

SEE ALSO

     glActiveTextureARB(3G), glTexGen(3G)

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