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Manual Reference Pages  - GLGETTEXGEN (3G)

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glGetTexGendv, glGetTexGenfv, glGetTexGeniv - return texture coordinate generation parameters

CONTENTS

C Specification
Parameters
Description
Notes
Errors
See Also

void glGetTexGendv( GLenum coord,

                  GLenum pname,
                  GLdouble *params )

void glGetTexGenfv( GLenum coord,

                  GLenum pname,
                  GLfloat *params )

void glGetTexGeniv( GLenum coord,

                  GLenum pname,
                  GLint *params )

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.

 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.

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 parameters for the active texture unit.

 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.

 glActiveTextureARB(3G),  glTexGen(3G)

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