glDrawArraysIndirect man page on Oracle
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GLDRAWARRAYSINDIRECT(3G) OpenGL Manual GLDRAWARRAYSINDIRECT(3G)
NAME
glDrawArraysIndirect - render primitives from array data, taking
parameters from memory
C SPECIFICATION
void glDrawArraysIndirect(GLenum mode, const void *indirect);
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.
indirect
Specifies the address of a structure containing the draw
parameters.
DESCRIPTION
glDrawArraysIndirect specifies multiple geometric primitives with very
few subroutine calls. glDrawArraysIndirect behaves similarly to
glDrawArraysInstancedBaseInstance(), execept that the parameters to
glDrawArraysInstancedBaseInstance() are stored in memory at the address
given by indirect.
The parameters addressed by indirect are packed into a structure that
takes the form (in C):
typedef struct {
uint count;
uint primCount;
uint first;
uint baseInstance;
} DrawArraysIndirectCommand;
const DrawArraysIndirectCommand *cmd = (const DrawArraysIndirectCommand *)indirect;
glDrawArraysInstancedBaseInstance(mode, cmd->first, cmd->count, cmd->primCount, cmd->baseInstance);
If a buffer is bound to the GL_DRAW_INDIRECT_BUFFER binding at the time
of a call to glDrawArraysIndirect, 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.
In contrast to glDrawArraysInstancedBaseInstance(), the first member of
the parameter structure is unsigned, and out-of-range indices do not
generate an error.
Vertex attributes that are modified by glDrawArraysIndirect have an
unspecified value after glDrawArraysIndirect returns. Attributes that
aren't modified remain well defined.
NOTES
The baseInstance member of the DrawArraysIndirectCommand structure is
defined only if the GL version is 4.2 or greater. For versions of the
GL less than 4.2, this parameter is present but is reserved and should
be set to zero. On earlier versions of the GL, behavior is undefined if
it is non-zero.
ERRORS
GL_INVALID_ENUM is generated if mode is not an accepted value.
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.
SEE ALSO
glDrawArrays(), glDrawArraysInstanced(), glDrawElements(),
glDrawRangeElements(),
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
opengl.org 04/29/2014 GLDRAWARRAYSINDIRECT(3G)
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