NAME

       glDrawElementsInstancedBaseVertex - render multiple instances of a set of primitives from
       array data with a per-element offset

C SPECIFICATION

       void glDrawElementsInstancedBaseVertex(GLenum mode, GLsizei count, GLenum type,
                                              GLvoid *indices, GLsizei primcount,
                                              GLint basevertex);

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_LINES_ADJACENCY, GL_LINE_STRIP_ADJACENCY, GL_TRIANGLES_ADJACENCY,
           GL_TRIANGLE_STRIP_ADJACENCY and GL_PATCHES are accepted.

       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.

       primcount
           Specifies the number of instances of the indexed geometry that should be drawn.

       basevertex
           Specifies a constant that should be added to each element of indices when chosing
           elements from the enabled vertex arrays.

DESCRIPTION

       glDrawElementsInstancedBaseVertex behaves identically to glDrawElementsInstanced() except
       that the ith element transferred by the corresponding draw call will be taken from element
       indices[i] + basevertex of each enabled array. If the resulting value is larger than the
       maximum value representable by type, it is as if the calculation were upconverted to
       32-bit unsigned integers (with wrapping on overflow conditions). The operation is
       undefined if the sum would be negative.

NOTES

       glDrawElementsInstancedBaseVertex is only supported if the GL version is 3.2 or greater.
           .SH "ERRORS"

       GL_INVALID_ENUM is generated if mode is not an accepted value.

       GL_INVALID_VALUE is generated if count or primcount is negative.

       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.

SEE ALSO

       glDrawElements(), glDrawRangeElements(), glDrawRangeElementsBaseVertex(),
       glDrawElementsInstanced(), glDrawElementsInstancedBaseVertex()

COPYRIGHT

       Copyright © 2010 Khronos Group. This material may be distributed subject to the terms and
       conditions set forth in the Open Publication License, v 1.0, 8 June 1999.
       http://opencontent.org/openpub/.

AUTHORS

       opengl.org