GLDRAWRANGEELEMENTS(3G) 												   GLDRAWRANGEELEMENTS(3G)

NAME

       glDrawRangeElements - render primitives from array data

C SPECIFICATION

       void glDrawRangeElements( GLenum mode,
				 GLuint start,
				 GLuint end,
				 GLsizei count,
				 GLenum type,
				 const GLvoid *indices )

PARAMETERS

       mode	Specifies   what   kind   of   primitives  to  render.	 Symbolic  constants  GL_POINTS,  GL_LINE_STRIP,  GL_LINE_LOOP,  GL_LINES,
		GL_TRIANGLE_STRIP, GL_TRIANGLE_FAN, GL_TRIANGLES, GL_QUAD_STRIP, GL_QUADS, and GL_POLYGON are accepted.

       start	Specifies the minimum array index contained in indices.

       end	Specifies the maximum array index contained in indices.

       count	Specifies the number of elements to be rendered.

       type	Specifies the type of the values in count. Must be one of GL_UNSIGNED_BYTE, GL_UNSIGNED_SHORT, or GL_UNSIGNED_INT.

       indices	Specifies a pointer to the location where the indices are stored.

DESCRIPTION

       glDrawRangeElements is  a  restricted  form  of	glDrawElements.  mode,	start,	end,  and  count  match  the  corresponding  arguments	to
       glDrawElements, with the additional constraint that all values in the arrays count must lie between start and end, inclusive.

       Implementations denote recommended maximum amounts of vertex and
       index  data,  which may be queried by calling glGet with argument GL_MAX_ELEMENTS_VERTICES and GL_MAX_ELEMENTS_INDICES.	If end - start + 1
       is greater than the value of GL_MAX_ELEMENTS_VERTICES, or if count is greater than the value of GL_MAX_ELEMENTS_INDICES, then the call  may
       operate at reduced performance.	There is no requirement that all vertices in the range [start, end] be referenced.  However, the implemen-
       tation may partially process unused vertices, reducing performance from what could be achieved with an optimal index set.

       When glDrawRangeElements is called, it uses count sequential elements from an enabled array, starting at start to construct a  sequence	of
       geometric  primitives.  mode  specifies	what kind of primitives are constructed, and how the array elements construct these primitives. If
       more than one array is enabled, each is used. If GL_VERTEX_ARRAY is not enabled, no geometric primitives are constructed.

       Vertex attributes that are modified by glDrawRangeElements have an unspecified value after glDrawRangeElements  returns.  For  example,	if
       GL_COLOR_ARRAY  is enabled, the value of the current color is undefined after glDrawRangeElements executes. Attributes that aren't modified
       maintain their previous values.

NOTES

       glDrawRangeElements is available only if the GL version is 1.2 or greater.

       glDrawRangeElements is included in display lists. If glDrawRangeElements is entered into a display list, the necessary array  data  (deter-
       mined  by  the  array  pointers	and enables) is also entered into the display list. Because the array pointers and enables are client-side
       state, their values affect display lists when the lists are created, not when the lists are executed.

ERRORS

       It is an error for indices to lie outside the range [start, end], but implementations may not check for this situation. Such indices  cause
       implementation-dependent behavior.

       GL_INVALID_ENUM is generated if mode is not an accepted value.

       GL_INVALID_VALUE is generated if count is negative.

       GL_INVALID_VALUE is generated if end < start.

       GL_INVALID_OPERATION is generated if glDrawRangeElements is executed between the execution of glBegin and the corresponding glEnd.

ASSOCIATED GETS

       glGet with argument GL_MAX_ELEMENTS_VERTICES

       glGet with argument GL_MAX_ELEMENTS_INDICES

SEE ALSO

       glArrayElement,	glColorPointer,  glDrawArrays,	glDrawElements,  glEdgeFlagPointer,  glGetPointerv,  glIndexPointer,  glInterleavedArrays,
       glNormalPointer, glTexCoordPointer, glVertexPointer

															   GLDRAWRANGEELEMENTS(3G)