HP Workstation zx2000 OpenGL 1.1 Reference for HP-UX 11.x - Page 274

M glMap1 274 glMap1 glMap1d, glMap1f: define a one-dimensional evaluator. C Specification void glMap1d( GLenum target, GLdouble u1, GLdouble u2, GLint stride, GLint order, const GLdouble *points) void glMap1f( GLenum target, GLfloat u1, GLfloat u2, GLint stride, GLint order, const GLfloat *points) Parameters target u1, u2 stride order points Specifies the kind of values that are generated by the evaluator. Symbolic constants GL_MAP1_VERTEX_3, GL_MAP1_VERTEX_4, GL_MAP1_INDEX, GL_MAP1_COLOR_4, GL_MAP1_NORMAL, GL_MAP1_TEXTURE_COORD_1, GL_MAP1_TEXTURE_COORD_2, GL_MAP1_TEXTURE_COORD_3, and GL_MAP1_TEXTURE_COORD_4 are accepted. Specify a linear mapping of u, as presented to glEvalCoord1, to $u hat$, the variable that is evaluated by the equations specified by this command. Specifies the number of floats or doubles between the beginning of one control point and the beginning of the next one in the data structure referenced in points. This allows control points to be embedded in arbitrary data structures. The only constraint is that the values for a particular control point must occupy contiguous memory locations. Specifies the number of control points. Must be positive. Specifies a pointer to the array of control points. Description Evaluators provide a way to use polynomial or rational polynomial mapping to produce vertices, normals, texture coordinates, and colors. The values produced by an evaluator are sent to further stages of GL processing just as if they had been presented using glVertex, glNormal, glTexCoord, and glColor commands, except that the generated values do not update the current normal, texture coordinates, or color. Chapter 11