Section : 3G Updated : 01/20/2022 Source : [FIXME: source] Note : [FIXME: manual] NAMEglDispatchComputeIndirect − launch one or more compute work groups using parameters stored in a buffer C SPECIFICATIONvoid glDispatchComputeIndirect(GLintptr indirect);PARAMETERSindirectThe 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_COUNTVERSION SUPPORT
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