GLGETTEXGEN - Online Linux Manual PageSection : 3G
NAME"glGetTexGendv, glGetTexGenfv, glGetTexGeniv − return texture coordinate generation parameters
C SPECIFICATIONvoid glGetTexGendv( GLenum coord, GLenum pname, GLdouble *params )void glGetTexGenfv( GLenum coord, GLenum pname, GLfloat *params )void glGetTexGeniv( GLenum coord, GLenum pname, GLint *params )
PARAMETERScoord  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.
DESCRIPTION­glGetTexGen 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. .BP ­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.
NOTESIf 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.
ERRORS­GL_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 ALSO­glActiveTextureARB(3G), ­glTexGen(3G) 0
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