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GLDRAWELEMENTSINSTAN(3G)                         OpenGL 3.3                         GLDRAWELEMENTSINSTAN(3G)



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, and GL_TRIANGLES 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 (C) 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/.



OpenGL 3.3                                       03/08/2011                         GLDRAWELEMENTSINSTAN(3G)