NAME¶
glDispatchComputeIndirect - launch one or more compute work groups using
parameters stored in a buffer
C SPECIFICATION¶
void
glDispatchComputeIndirect(GLintptr indirect);
PARAMETERS¶
indirect
The offset into the buffer object currently bound to the
GL_DISPATCH_INDIRECT_BUFFER buffer target at which the dispatch
parameters are stored.
DESCRIPTION¶
glDispatchComputeIndirect launches one or more compute work groups using
parameters stored in the buffer object currently bound to the
GL_DISPATCH_INDIRECT_BUFFER target. Each work group is processed by the
active program object for the compute shader stage. While the individual
shader invocations within a work group are executed as a unit, work groups are
executed completely independently and in unspecified order.
indirect
contains the offset into the data store of the buffer object bound to the
GL_DISPATCH_INDIRECT_BUFFER target at which the parameters are stored.
The parameters addressed by
indirect are packed a structure, which takes
the form (in C):
typedef struct {
uint num_groups_x;
uint num_groups_y;
uint num_groups_z;
} DispatchIndirectCommand;
A call to
glDispatchComputeIndirect is equivalent, assuming no errors are
generated, to:
cmd = (const DispatchIndirectCommand *)indirect;
glDispatchComputeIndirect(cmd->num_groups_x, cmd->num_groups_y, cmd->num_groups_z);
Unlike
glDispatchCompute(), no error is generated if any of the
num_groups_x, num_groups_y or num_groups_z members of the
DispatchIndirectCommand is larger than the value of
GL_MAX_COMPUTE_WORK_GROUP_COUNT for the corresponding dimension. In
such circumstances, behavior is undefined and may lead to application
termination.
ERRORS¶
GL_INVALID_OPERATION is generated if there is no active program for the
compute shader stage.
GL_INVALID_VALUE is generated if
indirect is less than zero or not
a multiple of four.
GL_INVALID_OPERATION is generated if no buffer is bound to the
GL_DISPATCH_INDIRECT_BUFFER target or if the command would source data
beyond the end of the buffer object's data store.
ASSOCIATED GETS¶
glGet() with argument
GL_MAX_COMPUTE_WORK_GROUP_COUNT
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 |
glDispatchComputeIndirect |
- |
- |
- |
- |
- |
- |
- |
- |
- |
✔ |
✔ |
✔ |
SEE ALSO¶
glDispatchCompute().
COPYRIGHT¶
Copyright © 2013-2014 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 © 2013-2014 Khronos Group