GLDISPATCHCOMPUTEIND - Online Linux Manual PageSection : 3G
Updated : 01/20/2022
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NAMEglDispatchComputeIndirect − launch one or more compute work groups using parameters stored in a buffer
C SPECIFICATIONvoid glDispatchComputeIndirect(GLintptr indirect);
PARAMETERSindirect The offset into the buffer object currently bound to the GL_DISPATCH_INDIRECT_BUFFER buffer target at which the dispatch parameters are stored.
DESCRIPTIONglDispatchComputeIndirect 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.
ERRORSGL_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 GETSglGet() with argument GL_MAX_COMPUTE_WORK_GROUP_COUNT
VERSION SUPPORT OpenGL Version Function / Feature Name 2.0 none;'>none;'>none;'>none;'>none;'>none;'>none;'>none;'>none;'>none;'>none;'>none;'>none;'> 2.1 3.0 3.1 3.2 3.3 4.0 4.1 4.2 4.3 4.4 4.5 glDispatchComputeIndirect − − − − − − − − − ✔ ✔ ✔
SEE ALSOglDispatchCompute().
COPYRIGHTCopyright © 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/.
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Copyright © 2013-2014 Khronos Group
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