HP Workstation zx2000 OpenGL 1.1 Reference for HP-UX 11.x - Page 140

E glEvalCoord glEvalCoord glEvalCoord1d, glEvalCoord1f, glEvalCoord2d, glEvalCoord2f, glEvalCoord1dv, glEvalCoord1fv, glEvalCoord2dv, glEvalCoord2fv: evaluate enabled one- and two-dimensional maps. C Specification void glEvalCoord1d( GLdouble u) void glEvalCoord1f( GLfloat u) void glEvalCoord2d( GLdouble u, GLdouble v) void glEvalCoord2f( GLfloat u, GLfloat v) void glEvalCoord1dv( const GLdouble *u) void glEvalCoord1fv( const GLfloat *u) void glEvalCoord2dv( const GLdouble *u) void glEvalCoord2fv( const GLfloat *u) Parameters u 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. u 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. Description glEvalCoord1 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 140 Chapter 5