GLTEXGEN - Online Linux Manual PageSection : 3G
NAME"glTexGend, glTexGenf, glTexGeni, glTexGendv, glTexGenfv, glTexGeniv − control the generation of texture coordinates
C SPECIFICATIONvoid glTexGend( GLenum coord, GLenum pname, GLdouble param )void glTexGenf( GLenum coord, GLenum pname, GLfloat param )void glTexGeni( GLenum coord, GLenum pname, GLint param )
PARAMETERScoord  Specifies a texture coordinate. Must be one of ­GL_S, ­GL_T, ­GL_R, or ­GL_Q. pname  Specifies the symbolic name of the texture-coordinate generation function. Must be ­GL_TEXTURE_GEN_MODE. param  Specifies a single-valued texture generation parameter, one of ­GL_OBJECT_LINEAR, ­GL_EYE_LINEAR, or ­GL_SPHERE_MAP.
C SPECIFICATIONvoid glTexGendv( GLenum coord, GLenum pname, const GLdouble *params )void glTexGenfv( GLenum coord, GLenum pname, const GLfloat *params )void glTexGeniv( GLenum coord, GLenum pname, const GLint *params )
PARAMETERScoord  Specifies a texture coordinate. Must be one of ­GL_S, ­GL_T, ­GL_R, or ­GL_Q. pname  Specifies the symbolic name of the texture-coordinate generation function or function parameters. Must be ­GL_TEXTURE_GEN_MODE, ­GL_OBJECT_PLANE, or ­GL_EYE_PLANE. params  Specifies a pointer to an array of texture generation parameters. If pname is ­GL_TEXTURE_GEN_MODE, then the array must contain a single symbolic constant, one of ­GL_OBJECT_LINEAR, ­GL_EYE_LINEAR, or ­GL_SPHERE_MAP. Otherwise, params holds the coefficients for the texture-coordinate generation function specified by pname.
DESCRIPTION­glTexGen selects a texture-coordinate generation function or supplies coefficients for one of the functions. coord names one of the (s, t, r, q) texture coordinates; it must be one of the symbols ­GL_S, ­GL_T, ­GL_R, or ­GL_Q. pname must be one of three symbolic constants: ­GL_TEXTURE_GEN_MODE, ­GL_OBJECT_PLANE, or ­GL_EYE_PLANE. If pname is ­GL_TEXTURE_GEN_MODE, then params chooses a mode, one of ­GL_OBJECT_LINEAR, ­GL_EYE_LINEAR, or ­GL_SPHERE_MAP. If pname is either ­GL_OBJECT_PLANE or ­GL_EYE_PLANE, params contains coefficients for the corresponding texture generation function. If the texture generation function is ­GL_OBJECT_LINEAR, the function g~=~p1xo~+~p2yo~+~p3zo~+~p4wo
is used, where g is the value computed for the coordinate named in coord, p1, p2, p3, and p4 are the four values supplied in params, and xo, yo, zo, and wo are the object coordinates of the vertex. This function can be used, for example, to texture-map terrain using sea level as a reference plane (defined by p1, p2, p3, and p4). The altitude of a terrain vertex is computed by the ­GL_OBJECT_LINEAR coordinate generation function as its distance from sea level; that altitude can then be used to index the texture image to map white snow onto peaks and green grass onto foothills. If the texture generation function is ­GL_EYE_LINEAR, the function g~=~p1primexe~+~p2primeye~+~p3primeze~+~p4primewe
is used, where $( p sub 1 sup prime ~~p sub 2 sup prime~~p sub 3 sup prime~~ { p sub 4 sup prime}) ~=~ ( p sub 1~~ p sub 2~~ p sub 3~~ p sub 4 ) ~M sup -1$
and xe, ye, ze, and we are the eye coordinates of the vertex, p1, p2, p3, and p4 are the values supplied in params, and M is the modelview matrix when ­glTexGen is invoked. If M is poorly conditioned or singular, texture coordinates generated by the resulting function may be inaccurate or undefined. Note that the values in params define a reference plane in eye coordinates. The modelview matrix that is applied to them may not be the same one in effect when the polygon vertices are transformed. This function establishes a field of texture coordinates that can produce dynamic contour lines on moving objects. If pname is ­GL_SPHERE_MAP and coord is either ­GL_S or ­GL_T, s and t texture coordinates are generated as follows. Let u be the unit vector pointing from the origin to the polygon vertex (in eye coordinates). Let n sup prime be the current normal, after transformation to eye coordinates. Let f~=~(fx~~fy~~fz)T be the reflection vector such that f~=~u~-~2nprimenprimeTu
Finally, let m~=~2√fx~2~+~fy~2~+~(fz~+~1)2. Then the values assigned to the s and t texture coordinates are s~=~fxoverm~+~1over2 t~=~fyoverm~+~1over2 To enable or disable a texture-coordinate generation function, call ­glEnable or ­glDisable with one of the symbolic texture-coordinate names (­GL_TEXTURE_GEN_S, ­GL_TEXTURE_GEN_T, ­GL_TEXTURE_GEN_R, or ­GL_TEXTURE_GEN_Q) as the argument. When enabled, the specified texture coordinate is computed according to the generating function associated with that coordinate. When disabled, subsequent vertices take the specified texture coordinate from the current set of texture coordinates. Initially, all texture generation functions are set to ­GL_EYE_LINEAR and are disabled. Both s plane equations are (1, 0, 0, 0), both t plane equations are (0, 1, 0, 0), and all r and q plane equations are (0, 0, 0, 0). When the ­GL_ARB_multitexture extension is supported, ­glTexGen set the texture generation parameters for the currently active texture unit, selected with ­glActiveTextureARB.
ERRORS­GL_INVALID_ENUM is generated when coord or pname is not an accepted defined value, or when pname is ­GL_TEXTURE_GEN_MODE and params is not an accepted defined value. ­GL_INVALID_ENUM is generated when pname is ­GL_TEXTURE_GEN_MODE, params is ­GL_SPHERE_MAP, and coord is either ­GL_R or ­GL_Q. ­GL_INVALID_OPERATION is generated if ­glTexGen is executed between the execution of ­glBegin and the corresponding execution of ­glEnd.
ASSOCIATED GETS­glGetTexGen
­glIsEnabled with argument ­GL_TEXTURE_GEN_S
­glIsEnabled with argument ­GL_TEXTURE_GEN_T
­glIsEnabled with argument ­GL_TEXTURE_GEN_R
­glIsEnabled with argument ­GL_TEXTURE_GEN_Q
SEE ALSO­glActiveTextureARB(3G), ­glCopyPixels(3G), ­glCopyTexImage2D(3G), ­glCopyTexSubImage1D(3G), ­glCopyTexSubImage2D(3G), ­glCopyTexSubImage3D(3G), ­glTexEnv(3G), ­glTexImage1D(3G), ­glTexImage2D(3G), ­glTexImage3D(3G), ­glTexParameter(3G), ­glTexSubImage1D(3G), ­glTexSubImage2D(3G), ­glTexSubImage3D(3G) 0
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