GLEVALCOORD - Online Linux Manual PageSection : 3G
NAME"glEvalCoord1d, glEvalCoord1f, glEvalCoord2d, glEvalCoord2f, glEvalCoord1dv, glEvalCoord1fv, glEvalCoord2dv, glEvalCoord2fv − evaluate enabled one- and two-dimensional maps
C SPECIFICATIONvoid glEvalCoord1d( GLdouble u ) void glEvalCoord1f( GLfloat u ) void glEvalCoord2d( GLdouble u, GLdouble v )void glEvalCoord2f( GLfloat u, GLfloat v )
PARAMETERSu  Specifies a value that is the domain coordinate u to the basis function defined in a previous ­glMap1 or ­glMap2 command. v  Specifies a value that is the domain coordinate v to the basis function defined in a previous ­glMap2 command. This argument is not present in a ­glEvalCoord1 command.
C SPECIFICATIONvoid glEvalCoord1dv( const GLdouble *u ) void glEvalCoord1fv( const GLfloat *u ) void glEvalCoord2dv( const GLdouble *u ) void glEvalCoord2fv( const GLfloat *u )
PARAMETERSu  Specifies a pointer to an array containing either one or two domain coordinates. The first coordinate is u. The second coordinate is v, which is present only in ­glEvalCoord2 versions.
DESCRIPTION­glEvalCoord1 evaluates enabled one-dimensional maps at argument u. ­glEvalCoord2 does the same for two-dimensional maps using two domain values, u and v. To define a map, call ­glMap1 and ­glMap2; to enable and disable it, call ­glEnable and ­glDisable. When one of the ­glEvalCoord commands is issued, all currently enabled maps of the indicated dimension are evaluated. Then, for each enabled map, it is as if the corresponding GL command had been issued with the computed value. That is, if ­GL_MAP1_INDEX or ­GL_MAP2_INDEX is enabled, a ­glIndex command is simulated. If ­GL_MAP1_COLOR_4 or ­GL_MAP2_COLOR_4 is enabled, a ­glColor command is simulated. If ­GL_MAP1_NORMAL or ­GL_MAP2_NORMAL is enabled, a normal vector is produced, and if any of ­GL_MAP1_TEXTURE_COORD_1, ­GL_MAP1_TEXTURE_COORD_2, ­GL_MAP1_TEXTURE_COORD_3, ­GL_MAP1_TEXTURE_COORD_4, ­GL_MAP2_TEXTURE_COORD_1, ­GL_MAP2_TEXTURE_COORD_2, ­GL_MAP2_TEXTURE_COORD_3, or ­GL_MAP2_TEXTURE_COORD_4 is enabled, then an appropriate ­glTexCoord command is simulated. For color, color index, normal, and texture coordinates the GL uses evaluated values instead of current values for those evaluations that are enabled, and current values otherwise, However, the evaluated values do not update the current values. Thus, if ­glVertex commands are interspersed with ­glEvalCoord commands, the color, normal, and texture coordinates associated with the ­glVertex commands are not affected by the values generated by the ­glEvalCoord commands, but only by the most recent ­glColor, ­glIndex, ­glNormal, and ­glTexCoord commands. No commands are issued for maps that are not enabled. If more than one texture evaluation is enabled for a particular dimension (for example, ­GL_MAP2_TEXTURE_COORD_1 and ­GL_MAP2_TEXTURE_COORD_2), then only the evaluation of the map that produces the larger number of coordinates (in this case, ­GL_MAP2_TEXTURE_COORD_2) is carried out. ­GL_MAP1_VERTEX_4 overrides ­GL_MAP1_VERTEX_3, and ­GL_MAP2_VERTEX_4 overrides ­GL_MAP2_VERTEX_3, in the same manner. If neither a three- nor a four-component vertex map is enabled for the specified dimension, the ­glEvalCoord command is ignored. If you have enabled automatic normal generation, by calling ­glEnable with argument ­GL_AUTO_NORMAL, ­glEvalCoord2 generates surface normals analytically, regardless of the contents or enabling of the ­GL_MAP2_NORMAL map. Let boldm~=~partialboldpoverpartialu~times~partialboldpoverpartialv
Then the generated normal boldn is
boldn~=~boldmover||boldm||
If automatic normal generation is disabled, the corresponding normal map ­GL_MAP2_NORMAL, if enabled, is used to produce a normal. If neither automatic normal generation nor a normal map is enabled, no normal is generated for ­glEvalCoord2 commands.
ASSOCIATED GETS­glIsEnabled with argument ­GL_MAP1_VERTEX_3
­glIsEnabled with argument ­GL_MAP1_VERTEX_4
­glIsEnabled with argument ­GL_MAP1_INDEX
­glIsEnabled with argument ­GL_MAP1_COLOR_4
­glIsEnabled with argument ­GL_MAP1_NORMAL
­glIsEnabled with argument ­GL_MAP1_TEXTURE_COORD_1
­glIsEnabled with argument ­GL_MAP1_TEXTURE_COORD_2
­glIsEnabled with argument ­GL_MAP1_TEXTURE_COORD_3
­glIsEnabled with argument ­GL_MAP1_TEXTURE_COORD_4
­glIsEnabled with argument ­GL_MAP2_VERTEX_3
­glIsEnabled with argument ­GL_MAP2_VERTEX_4
­glIsEnabled with argument ­GL_MAP2_INDEX
­glIsEnabled with argument ­GL_MAP2_COLOR_4
­glIsEnabled with argument ­GL_MAP2_NORMAL
­glIsEnabled with argument ­GL_MAP2_TEXTURE_COORD_1
­glIsEnabled with argument ­GL_MAP2_TEXTURE_COORD_2
­glIsEnabled with argument ­GL_MAP2_TEXTURE_COORD_3
­glIsEnabled with argument ­GL_MAP2_TEXTURE_COORD_4
­glIsEnabled with argument ­GL_AUTO_NORMAL
­glGetMap
SEE ALSO ­glBegin(3G), ­glColor(3G), ­glEnable(3G), ­glEvalMesh(3G), ­glEvalPoint(3G), ­glIndex(3G), ­glMap1(3G), ­glMap2(3G), ­glMapGrid(3G), ­glNormal(3G), ­glTexCoord(3G), ­glVertex(3G) 0
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