1GLGETTEXGEN(3G)                  OpenGL Manual                 GLGETTEXGEN(3G)
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NAME

6       glGetTexGen - return texture coordinate generation parameters
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C SPECIFICATION

9       void glGetTexGendv(GLenum coord, GLenum pname, GLdouble * params);
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11       void glGetTexGenfv(GLenum coord, GLenum pname, GLfloat * params);
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13       void glGetTexGeniv(GLenum coord, GLenum pname, GLint * params);
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PARAMETERS

16       coord
17           Specifies a texture coordinate. Must be GL_S, GL_T, GL_R, or GL_Q.
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19       pname
20           Specifies the symbolic name of the value(s) to be returned. Must be
21           either GL_TEXTURE_GEN_MODE or the name of one of the texture
22           generation plane equations: GL_OBJECT_PLANE or GL_EYE_PLANE.
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24       params
25           Returns the requested data.
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DESCRIPTION

28       glGetTexGen returns in params selected parameters of a texture
29       coordinate generation function that was specified using glTexGen().
30       coord names one of the (s, t, r, q) texture coordinates, using the
31       symbolic constant GL_S, GL_T, GL_R, or GL_Q.
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33       pname specifies one of three symbolic names:
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35       GL_TEXTURE_GEN_MODE
36           params returns the single-valued texture generation function, a
37           symbolic constant. The initial value is GL_EYE_LINEAR.
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39       GL_OBJECT_PLANE
40           params returns the four plane equation coefficients that specify
41           object linear-coordinate generation. Integer values, when
42           requested, are mapped directly from the internal floating-point
43           representation.
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45       GL_EYE_PLANE
46           params returns the four plane equation coefficients that specify
47           eye linear-coordinate generation. Integer values, when requested,
48           are mapped directly from the internal floating-point
49           representation. The returned values are those maintained in eye
50           coordinates. They are not equal to the values specified using
51           glTexGen(), unless the modelview matrix was identity when
52           glTexGen() was called.
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NOTES

55       If an error is generated, no change is made to the contents of params.
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57       For OpenGL versions 1.3 and greater, or when the ARB_multitexture
58       extension is supported, glGetTexGen returns the texture coordinate
59       generation parameters for the active texture unit.
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ERRORS

62       GL_INVALID_ENUM is generated if coord or pname is not an accepted
63       value.
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65       GL_INVALID_OPERATION is generated if glGetTexGen is executed between
66       the execution of glBegin() and the corresponding execution of glEnd().
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SEE ALSO

69       glActiveTexture(), glTexGen()
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72       Copyright © 1991-2006 Silicon Graphics, Inc. This document is licensed
73       under the SGI Free Software B License. For details, see
74       http://oss.sgi.com/projects/FreeB/.
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AUTHORS

77       opengl.org
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81opengl.org                        06/10/2014                   GLGETTEXGEN(3G)
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