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_LINE_STRIP_ADJACENCY, GL_LINES_ADJACENCY,
           GL_TRIANGLE_STRIP, GL_TRIANGLE_FAN, GL_TRIANGLES, GL_TRIANGLE_STRIP_ADJACENCY,
           GL_TRIANGLES_ADJACENCY and GL_PATCHES 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 indices. 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
       implementation 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.

       Vertex attributes that are modified by glDrawRangeElements have an unspecified value after
       glDrawRangeElements returns. Attributes that aren't modified maintain their previous
       values.

NOTES

       GL_LINE_STRIP_ADJACENCY, GL_LINES_ADJACENCY, GL_TRIANGLE_STRIP_ADJACENCY and
       GL_TRIANGLES_ADJACENCY are available only if the GL version is 3.2 or greater.

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 a geometry shader is active and mode is incompatible
       with the input primitive type of the geometry shader in the currently installed program
       object.

       GL_INVALID_OPERATION is generated if a non-zero buffer object name is bound to an enabled
       array or the element array and the buffer object's data store is currently mapped.

ASSOCIATED GETS

       glGet() with argument GL_MAX_ELEMENTS_VERTICES

       glGet() with argument GL_MAX_ELEMENTS_INDICES

SEE ALSO

       glDrawArrays(), glDrawElements(), glDrawElementsBaseVertex()

COPYRIGHT

       Copyright © 1991-2006 Silicon Graphics, Inc. This document is licensed under the SGI Free
       Software B License. For details, see http://oss.sgi.com/projects/FreeB/.

AUTHORS

       opengl.org