Linux Manuals session 3

vpCreateMinMaxOctree, vpMinMaxOctreeThreshold, vpDestroyMinMaxOctree – create/destroy a min-max octree for optimized rendering Synopsis #include <volpack.h> vpResult vpCreateMinMaxOctree(vpc, root_node_size, base_node_size) vpContext *vpc; int root_node_size, base_node_size; vpResult vpMinMaxOctreeThreshold(vpc, param_num, range) vpContext *vpc; int param_num, range; vpResult vpDestroyMinMaxOctree(vpc) vpContext *vpc; Arguments vpc VolPack context from vpCreateContext. root_node_size Number of voxels per side in the top level (largest nodes) of…

vpCreateContext, vpDestroyContext – create/destroy a rendering context Synopsis #include <volpack.h> vpContext * vpCreateContext() void vpDestroyContext(vpc) vpContext *vpc; Arguments vpc VolPack context from vpCreateContext. Description vpCreateContext returns a handle for a new rendering context. It contains default values for most of the rendering parameters. vpDestroyContext destroys a rendering context and frees the associated memory. Only data…

vpClassifyVolume, vpDestroyClassifiedVolume – create/destroy a preclassified volume for fast rendering Synopsis #include <volpack.h> vpResult vpClassifyVolume(vpc) vpContext *vpc; vpResult vpDestroyClassifyVolume(vpc) vpContext *vpc; Arguments vpc VolPack context from vpCreateContext. Description vpClassifyVolume is used to compute a preclassified volume for the fast rendering algorithm. The preclassified volume is an internal data structure optimized for rendering speed. vpClassifyVolume should…

vpClassifyScanline – incrementally create a preclassified volume from scanlines of scalar data Synopsis #include <volpack.h> vpResult vpClassifyScanline(vpc, voxels) vpContext *vpc; void *voxels; Arguments vpc VolPack context from vpCreateContext. voxels 1D array of voxel data. Description vpClassifyScanline is used to incrementally compute a preclassified volume by classifying one scanline of voxels and storing the result in…

vpClassifyScalars – create a preclassified volume from scalar data Synopsis #include <volpack.h> vpResult vpClassifyScalars(vpc, scalar_data, length, scalar_field, gradient_field, norm_field) vpContext *vpc; unsigned char *scalars; int size; int scalar_field, gradient_field, norm_field; Arguments vpc VolPack context from vpCreateContext. scalar_data A 3D array containing one 8-bit scalar value for each voxel in the volume. length Size of scalar_data…

vpBruteForceRender – render using a simple brute-force method Synopsis #include <volpack.h> vpResult vpBruteForceRender(vpc) vpContext *vpc; Arguments vpc VolPack context from vpCreateContext. Description This function is for debugging purposes only. It performs the same function as vpRenderRawVolume, but uses a simpler, very inefficient algorithm. The two functions should produce identical results. See Also VolPack(3), vpRenderRawVolume(3)

vpBoxFilter, vpLinearFilter, vpBicubicFilter, vpGaussianFilter – initialize a filter weight table Synopsis #include <volpack.h> vpResult vpBoxFilter(num_taps, num_phases, weights, weights_bytes) int num_taps, num_phases; float *weights; int weights_bytes; vpResult vpLinearFilter(num_taps, num_phases, weights, weights_bytes) int num_taps, num_phases; float *weights; int weights_bytes; vpResult vpBicubicFilter(b_value, c_value, num_taps, num_phases, weights, weights_bytes) double b_value, c_value; int num_taps, num_phases; float *weights; int weights_bytes; vpResult…

votequorum_trackstop – Disable callbacks notification. Synopsis #include <corosync/votequorum.h> int votequorum_trackstart(votequorum_handle_t *handle); Description The votequorum_trackstop function is used to disable callbacks notification from the votequorum API. Return Value This call returns the CS_OK value if successful, otherwise an error is returned. Errors CS_ERR_TRY_AGAIN Resource temporarily unavailable CS_ERR_INVALID_PARAM Invalid argument CS_ERR_ACCESS Permission denied CS_ERR_LIBRARY The connection failed…

votequorum_trackstart – Enable callbacks notification. Synopsis #include <corosync/votequorum.h> int votequorum_trackstart(votequorum_handle_t *handle, uint64_t context, unsigned int flags); Description The votequorum_trackstart function is used to enable callbacks notification from the votequorum API. Every time the voting configuraton changes (eg a node joins or leave the cluster) or the quorum status change or the expected votes changes, the…

votequorum_setvotes – Sets the number of votes for a node Synopsis #include <corosync/votequorum.h> int votequorum_setexpected(votequorum_handle_t handle, unsigned int nodeid, int votes); Description The votequorum_setvotes is used to change the number of votes that a node has. Note that it is not possible, using this function, to change the number of node votes such that the…

votequorum_setexpected – Sets the expected votes for the cluster Synopsis #include <corosync/votequorum.h> int votequorum_setexpected(votequorum_handle_t handle, int expected_votes); Description The votequorum_setexpected function is used to change the expected votes in the cluster. Expected votes is used to calculate quorum and should normally be the total number of votes that will exist when all the expected nodes…

votequorum_qdevice_update – Updates quorum device name Synopsis #include <corosync/votequorum.h> int votequorum_qdevice_update(votequorum_handle_t handleconst char oldname, const char newname); Description The votequorum_qdevice_update is used to change the name of the quorum device to corosync. The name of q quorum device is purely informational and has no significance to votequorum itself, but it’s useful for the name (displayed…

votequorum_qdevice_unregister – Unregisters a new quorum device Synopsis #include <corosync/votequorum.h> int votequorum_qdevice_unregister(votequorum_handle_t handle, const char *name); Description The votequorum_qdevice_unregister unregisters a quorum device. Any votes it had will be removed from the cluster. NOTE that this could make the cluster inquorate. Return Value This call returns the CS_OK value if successful, otherwise an error is…

votequorum_qdevice_register – Registers a new quorum device Synopsis #include <corosync/votequorum.h> int votequorum_qdevice_register(votequorum_handle_t handle, const char *name); Description The votequorum_qdevice_register is used to register a new quorum device. A quorum device is an external way of adding votes to a small cluster. The quorum device is, in effect, a pseudo node in the cluster that provide…

votequorum_qdevice_poll – Tells votequorum the result of the quorum device poll Synopsis #include <corosync/votequorum.h> int votequorum_qdevice_poll(votequorum_handle_t handle, const char *name, unsigned int cast_vote, votequorum_ring_id_t ring_id); Description The votequorum_qdevice_poll is called by the quorum device subsystem (not provided as part of votequorum) to tell the voting system if the quorum device is present/active or not. If…

votequorum_qdevice_master_wins – Sets or clears quorum device master_wins flag Synopsis #include <corosync/votequorum.h> int votequorum_qdevice_master_wins(votequorum_handle_t handle const char name, unsigned int allow); Description The votequorum_qdevice_master_wins informs votequorum whether or not the currently registered qdevice subsystem supports ‘master_wins’ mode (default 0). This mode allows the qdevice to effectively take over the quorum calculations of votequorum. Any node…

votequorum_initialize – Create a new connection to the VoteQuorum service Synopsis #include <corosync/votequorum.h> int votequorum_initialize(votequorum_handle_t *handle, votequorum_callbacks_t *callbacks); Description The votequorum_initialize function is used to initialize a connection to the vote-based quorum database API. Each application may have several connections to the votequorum API. Each application uses the handle argument to uniquely identify the connection….

votequorum_getinfo – Get information about the VoteQuorum service Synopsis #include <corosync/votequorum.h> int votequorum_getinfo(votequorum_handle_t *handle, unsigned int nodeid, struct votequorum_info *info); Description The votequorum_getinfo function is used to get information about the voting system and its nodes. The nodeid argument indicates which node information should be stored in the votequorum_info structure. The votequorum_info structure is defined…

votequorum_finalize – Terminate a connection to the votequorum service Synopsis #include <corosync/votequorum.h> int votequorum_finalize(votequorum_handle_t handle); Description The votequorum_finalize function is used to close a connection to the configuration dabatase API. Once the connection is finalized, the handle may not be used again by applications. No more callbacks will be dispatched from the votequorum_dispatch function. Return…

votequorum_fd_get – Dispatches callbacks from the votequorum service Synopsis #include <corosync/votequorum.h> int votequorum_fd_get(votequorum_handle_t handle, int *fd); Description The votequorum_fd_get function is used to retrieve the file descriptor that may be used with the poll system call to determine when votequorum_dispatch(3) won’t block. The handle argument may not be used directly with poll because it is…