GLMULTIDRAWELEMENTSI(3G)        [FIXME: manual]       GLMULTIDRAWELEMENTSI(3G)

NAME
       glMultiDrawElementsIndirectCount - render indexed primitives from array
       data, taking parameters and count from memory

C SPECIFICATION
       void glMultiDrawElementsIndirectCount(GLenum mode, GLenum type,
                                             const void *indirect,
                                             GLintptr drawcount,
                                             GLsizei maxdrawcount,
                                             GLsizei stride);

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.

       type
           Specifies the type of data in the buffer bound to the
           GL_ELEMENT_ARRAY_BUFFER binding. Must be one of GL_UNSIGNED_BYTE,
           GL_UNSIGNED_SHORT, or GL_UNSIGNED_INT.

       indirect
           Specifies the address of a structure containing an array of draw
           parameters.

       drawcount
           Specifies an offset (in bytes) into the buffer object bound to the
           GL_PARAMETER_BUFFER binding point at which a single sizei typed
           value is stored. Must be a multiple of four.

       maxdrawcount
           Specifies the maximum number of draws that are expected to be
           stored in the buffer. If the value stored at drawcount into the
           buffer is greater than maxdrawcount, the implementation stops
           processing draws after maxdrawcount parameter sets.

       stride
           Specifies the distance in basic machine units between elements of
           the draw parameter array.

DESCRIPTION
       glMultiDrawElementsIndirectCount specifies multiple geometric
       primitives with very few subroutine calls.
       glMultiDrawElementsIndirectCount behaves similarly to
       glMultiDrawElementsIndirect(), execept that the drawcount parameter is
       stored in the buffer bound to the GL_PARAMETER_BUFFER binding at the
       offset specified by drawcount.

       The parameters addressed by indirect are packed into a structure that
       takes the form (in C):

               typedef  struct {
                   uint  count;
                   uint  instanceCount;
                   uint  firstIndex;
                   int  baseVertex;
                   uint  baseInstance;
               } DrawElementsIndirectCommand;

       If a buffer is bound to the GL_DRAW_INDIRECT_BUFFER binding at the time
       of a call to glMultiDrawElementsIndirectCount, indirect is interpreted
       as an offset, in basic machine units, into that buffer and the
       parameter data is read from the buffer rather than from client memory.

       Note that indices stored in client memory are not supported. If no
       buffer is bound to the GL_ELEMENT_ARRAY_BUFFER binding, an error will
       be generated.

       The results of the operation are undefined if the reservedMustBeZero
       member of the parameter structure is non-zero. However, no error is
       generated in this case.

       Vertex attributes that are modified by glMultiDrawElementsIndirectCount
       have an unspecified value after glMultiDrawElementsIndirectCount
       returns. Attributes that aren't modified remain well defined.

ERRORS
       GL_INVALID_ENUM is generated if mode is not an accepted value.

       GL_INVALID_VALUE is generated if stride is not a multiple of four.

       GL_INVALID_VALUE is generated if drawcount is negative.

       GL_INVALID_OPERATION is generated if no buffer is bound to the
       GL_ELEMENT_ARRAY_BUFFER binding, or if such a buffer's data store is
       currently mapped.

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

       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 mode is GL_PATCHES and no
       tessellation control shader is active.

       GL_INVALID_OPERATION error is generated if no buffer is bound to the
       GL_PARAMETER_BUFFER binding point.

       GL_INVALID_OPERATION error is generated if drawcount is not a multiple
       of four.

       GL_INVALID_OPERATION error is generated if reading a sizei typed value
       from the buffer bound to the GL_PARAMETER_BUFFER target at the offset
       specified by drawcount would result in an out-of-bounds access.

VERSION SUPPORT

       +---------------------------------+-----------------------------------------------------------------------------+
       |                                 |                               OpenGL Version                                |
       +---------------------------------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+
       |Function / Feature Name          | 2.0 | 2.1 | 3.0 | 3.1 | 3.2 | 3.3 | 4.0 | 4.1 | 4.2 | 4.3 | 4.4 | 4.5 | 4.6 |
       +---------------------------------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+
       |glMultiDrawElementsIndirectCount |  -  |  -  |  -  |  -  |  -  |  -  |  -  |  -  |  -  |  -  |  -  |  -  | <?> |
       +---------------------------------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+

SEE ALSO
       glDrawArrays(), glDrawArraysInstanced(), glDrawArraysIndirect(),
       glDrawElements(), glDrawRangeElements(), glDrawElementsIndirect(),
       glMultiDrawArraysIndirect() glMultiDrawArraysIndirectCount()
       glMultiDrawElementsIndirect()

COPYRIGHT
       Copyright (C) 2010-2014 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.  https://opencontent.org/openpub/.

COPYRIGHT
       Copyright (C) 2010-2014 Khronos Group.

[FIXME: source]                   03/14/2026          GLMULTIDRAWELEMENTSI(3G)