glDispatchComputeIndirect man page on RedHat
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GLDISPATCHCOMPUTEIND(3G) OpenGL Manual GLDISPATCHCOMPUTEIND(3G)
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
SEE ALSO
glDispatchCompute().
COPYRIGHT
Copyright © 2012 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 03/16/2013 GLDISPATCHCOMPUTEIND(3G)
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