NAME

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

C SPECIFICATION

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

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.

       baseinstance
           Specifies the base instance for use in fetching instanced vertex attributes.

DESCRIPTION

       glDrawElementsInstancedBaseVertexBaseInstance 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. The basevertex has
       no effect on the shader-visible value of gl_VertexID.

       Specific vertex attributes may be classified as instanced through the use of
       glVertexAttribDivisor(). Instanced vertex attributes supply per-instance vertex data to
       the vertex shader. The index of the vertex fetched from the enabled instanced vertex
       attribute arrays is calculated as gl _ InstanceID divisor + baseInstance. Note that
       baseinstance does not affect the shader-visible value of gl_InstanceID.

NOTES

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

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.

VERSION SUPPORT

       ┌──────────────────────────────────────────────┬───────────────────────────────────────────────────────────────────────┐
       │                                              │                OpenGL Version                                         │
       ├──────────────────────────────────────────────┼─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┤
       │Function                                      │ 2.0 │ 2.1 │ 3.0 │ 3.1 │ 3.2 │ 3.3 │ 4.0 │ 4.1 │ 4.2 │ 4.3 │ 4.4 │ 4.5 │
       │/                                             │     │     │     │     │     │     │     │     │     │     │     │     │
       │Feature                                       │     │     │     │     │     │     │     │     │     │     │     │     │
       │Name                                          │     │     │     │     │     │     │     │     │     │     │     │     │
       ├──────────────────────────────────────────────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┤
       │glDrawElementsInstancedBaseVertexBaseInstance │  -  │  -  │  -  │  -  │  -  │  -  │  -  │  -  │  ✔  │  ✔  │  ✔  │  ✔  │
       └──────────────────────────────────────────────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┘

SEE ALSO

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

COPYRIGHT

       Copyright © 2011-2014 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/.

COPYRIGHT

       Copyright © 2011-2014 Khronos Group

[FIXME: source]                             01/03/2018                   GLDRAWELEMENTSINSTAN(3G)