OpenVDB: openvdb_ax/compiler/VolumeExecutable.h Source File

OpenVDB 10.0.1

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VolumeExecutable.h
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1// Copyright Contributors to the OpenVDB Project
2// SPDX-License-Identifier: MPL-2.0
3
4/// @file compiler/VolumeExecutable.h
5///
6/// @authors Nick Avramoussis, Francisco Gochez, Richard Jones
7///
8/// @brief The VolumeExecutable, produced by the OpenVDB AX Compiler for
9/// execution over Numerical OpenVDB Grids.
10///
11
12#ifndef OPENVDB_AX_COMPILER_VOLUME_EXECUTABLE_HAS_BEEN_INCLUDED
13#define OPENVDB_AX_COMPILER_VOLUME_EXECUTABLE_HAS_BEEN_INCLUDED
14
15#include "CustomData.h"
16#include "AttributeRegistry.h"
17#include "AttributeBindings.h"
18
19#include <openvdb/version.h>
20#include <openvdb/Grid.h>
21
22#include <unordered_map>
23
24class TestVolumeExecutable;
25
26namespace llvm {
27class ExecutionEngine;
28class LLVMContext;
29}
30
31namespace openvdb {
32 OPENVDB_USE_VERSION_NAMESPACE
33namespace OPENVDB_VERSION_NAME {
34namespace ax {
35
36class Compiler;
37
38/// @brief Object that encapsulates compiled AX code which can be executed on a
39/// collection of VDB volume grids. Executables are created by the compiler
40/// and hold the final immutable JIT compiled function and context.
41/// @details The VolumeExecutable is returned from the ax::Compiler when
42/// compiling AX code for volume execution. The class represents a typical AX
43/// executable object; immutable except for execution settings and implements
44/// 'execute' functions which can be called multiple times for arbitrary sets
45/// of inputs. The intended usage of these executables is to configure their
46/// runtime arguments and then call VolumeExecutable::execute with your VDBs.
47/// For example:
48/// @code
49/// VolumeExecutable::Ptr exe = compiler.compile<VolumeExecutable>("@a += 1");
50/// exe->setTreeExecutionLevel(0); // only process leaf nodes
51/// exe->setValueIterator(VolumeExecutable::IterType::ALL); // process all values
52/// exe->execute(vdbs); // run on a set of vdbs
53/// exe->execute(grid); // run on a single vdb
54/// @endcode
55///
56/// The Volume executable is initialised with specific configurable settings:
57/// - Iteration Level: min=0, max=RootNode::Level.
58/// By default, processes the entire VDB tree hierarchy.
59/// @sa setTreeExecutionLevel
60/// - Iteration Type: ON
61/// By default, processes ACTIVE values.
62/// @sa setValueIterator
63/// - Active Tile Streaming: ON, OFF or AUTO depending on AX code.
64/// By default, if AX detects that the AX program may produce unique
65/// values for leaf level voxels that would otherwise comprise a
66/// given active tile, this setting is set to ON or AUTO. Otherwise it is
67/// set to OFF.
68/// @sa setActiveTileStreaming
69/// - Grain sizes: 1:32
70/// The default grain sizes passed to the tbb partitioner for leaf level
71/// processing and active tile processing.
72/// @sa setGrainSize
73/// @sa setActiveTileStreamingGrainSize
74/// - AttributeBindings: None
75/// Whether to indriect any AX accesses to different grid names.
76/// @sa setAttributeBindings
77///
78/// For more in depth information, see the @ref vdbaxcompilerexe documentation.
79 class OPENVDB_AX_API VolumeExecutable
80{
81public:
82 using Ptr = std::shared_ptr<VolumeExecutable>;
83 ~VolumeExecutable();
84
85 /// @brief Copy constructor. Shares the LLVM constructs but deep copies the
86 /// settings. Multiple copies of an executor can be used at the same time
87 /// safely.
88 VolumeExecutable(const VolumeExecutable& other);
89
90 ////////////////////////////////////////////////////////
91
92 ///@{
93 /// @brief Run this volume executable binary on target volumes.
94 /// @details This method reads from the stored settings on the executable
95 /// to determine certain behaviour and runs the JIT compiled function
96 /// across every valid VDB value. Topology may be changed, deleted or
97 /// created.
98 ///
99 /// This method is thread safe; it can be run concurrently from the same
100 /// VolumeExecutable instance on different inputs.
101 ///
102 /// @param grids The VDB Volumes to process
103 void execute(openvdb::GridPtrVec& grids) const;
104 void execute(openvdb::GridBase& grids) const;
105 ///@}
106
107 ////////////////////////////////////////////////////////
108
109 /// @brief Set the behaviour when missing grids are accessed. Default
110 /// behaviour is true, which creates them with default transforms and
111 /// background values
112 /// @param flag Enables or disables the creation of missing attributes
113 void setCreateMissing(const bool flag);
114 /// @return Whether this executable will generate new grids.
115 bool getCreateMissing() const;
116
117 /// @brief Set the execution level for this executable. This controls what
118 /// nodes are processed when execute is called. Possible values depend on
119 /// the OpenVDB configuration in use, however a value of 0 will always
120 /// correspond to the lowest level (leaf-level). By default, the min
121 /// level is zero (LeafNodeType::LEVEL) and the max level is the root
122 /// node's level (RootNodeType::LEVEL). In other words, the default
123 /// execution level settings process the whole of the tree.
124 /// @note A value larger that the number of levels in the tree (i.e. larger
125 /// than the root node's level) will cause this method to throw a runtime
126 /// error.
127 /// @param min The minimum tree execution level to set
128 /// @param max The maximum tree execution level to set
129 void setTreeExecutionLevel(const Index min, const Index max);
130 /// @param level The tree execution level to set. Calls setTreeExecutionLevel
131 /// with min and max arguments as level.
132 void setTreeExecutionLevel(const Index level);
133 /// @brief Get the tree execution levels.
134 /// @param min The minimum tree execution level
135 /// @param max The maximum tree execution level
136 void getTreeExecutionLevel(Index& min, Index& max) const;
137
138 /// @brief The streaming type of active tiles during execution.
139 /// @param ON active tiles are temporarily densified (converted to leaf
140 /// level voxels) on an "as needed" basis and the subsequent voxel
141 /// values are processed. The temporarily densified node is added to the
142 /// tree only if a non constant voxel buffer is produced. Otherwise a
143 /// child tile may be created or the original tile's value may simply be
144 /// modified.
145 /// @param OFF tile topologies are left unchanged and their single value is
146 /// processed.
147 /// @param AUTO the volume executable analyzes the compiled kernel and
148 /// attempts to determine if expansion of active tiles would lead to
149 /// different, non-constant values in the respective voxels. This is
150 /// done on a per grid basis; ultimately each execution will be set to
151 /// ON or OFF. This option will always fall back to ON if there is any
152 /// chance the kernel may produce child nodes
153 ///
154 /// @note The volume executable always runs an AUTO check on creation and
155 /// will set itself to ON (if all grids always need child nodes), OFF (if
156 /// grids never need child nodes) or remains as AUTO (if this depends on
157 /// which grid is being processed).
158 ///
159 /// @details When an AX kernel is run over coarser levels of the tree (i.e.
160 /// not leaf voxels), it is often desirable to densify these areas into
161 /// unique voxels such that they can each receive a unique value. For
162 /// example, consider the following AX code which assigns a vector volume
163 /// to the world space position of each voxel:
164 /// @code
165 /// v@v = getvoxelpws();
166 /// @endcode
167 /// Active tiles hold a single value but comprise an area greater than
168 /// that of a single voxel. As the above kernel varies with respect to
169 /// a nodes position, we'd need to replace these tiles with leaf voxels
170 /// to get unique per node values. The stream flag is initialised to ON
171 /// in this case.
172 ///
173 /// This behaviour, however, is not always desirable .i.e:
174 /// @code
175 /// v@v = {1,2,3};
176 /// @endcode
177 /// In this instance, all values within a volume receive the same value
178 /// and are not dependent on any spatially or iteratively varying
179 /// metrics. The stream flag is set to OFF.
180 ///
181 /// The AUTO flag is set in cases where the runtime access pattern of the
182 /// inputs determines streaming:
183 /// @code
184 /// f@density = f@mask;
185 /// f@mask = 0;
186 /// @endcode
187 /// In this instance, the runtime topology and values of \@mask determines
188 /// whether child topology needs to be created in \@density, but \@mask
189 /// itself does not need streaming. Streaming will be set to ON for
190 /// density but OFF for mask.
191 ///
192 /// @note This behaviour is only applied to active tiles. If the value
193 /// iterator is set to OFF, this option is ignored.
194 /// @warning This option can generate large amounts of leaf level voxels.
195 /// It is recommended to use a good concurrent memory allocator (such as
196 /// jemalloc) for the best performance.
197 enum class Streaming { ON, OFF, AUTO };
198 /// @brief Controls the behaviour of expansion of active tiles.
199 /// @param s The behaviour to set
200 void setActiveTileStreaming(const Streaming& s);
201 /// @return The current stream behaviour.
202 Streaming getActiveTileStreaming() const;
203 /// @return The current stream behaviour for a particular grid. This is
204 /// either ON or OFF.
205 /// @param name The name of the grid to query
206 /// @param type The grids type
207 Streaming getActiveTileStreaming(const std::string& name,
208 const ast::tokens::CoreType& type) const;
209
210 enum class IterType { ON, OFF, ALL };
211 /// @brief Set the value iterator type to use with this executable. Options
212 /// are ON, OFF, ALL. Default is ON.
213 /// @param iter The value iterator type to set
214 void setValueIterator(const IterType& iter);
215 /// @return The current value iterator type
216 IterType getValueIterator() const;
217
218 ///@{
219 /// @brief Set the threading grain sizes used when iterating over nodes
220 /// in a VDB.
221 /// @details Two grain sizes are provided, the first of which (g1) is used
222 /// to determine the chunk size of nodes which are not being streamed (see
223 /// setActiveTileStream). Leaf node execution always uses this grain size.
224 /// The default value for g1 is 1 which is typically appropriate for most
225 /// AX kernels.
226 /// The second grain size is used when streaming execution over active
227 /// tiles in a VDB. This execution model differs significantly from
228 /// typical leaf node execution due to the potential for substantially
229 /// more memory to be allocated. The default value is 32, which works well
230 /// for the default configuration of OpenVDB. If streaming is disabled,
231 /// this value has no effect.
232 /// @note Setting g1 or g2 to zero has the effect of disabling
233 /// multi-threading for the respective node executions. Setting both to
234 /// zero will disable all multi-threading performed by the execute method.
235 void setGrainSize(const size_t g1);
236 void setActiveTileStreamingGrainSize(const size_t g2);
237 /// @return The current g1 grain size
238 /// @sa setGrainSize
239 size_t getGrainSize() const;
240 /// @return The current g2 grain size
241 /// @sa setActiveTileStreamingGrainSize
242 size_t getActiveTileStreamingGrainSize() const;
243 ///@}
244
245 /// @brief Set attribute bindings.
246 /// @param bindings A map of attribute bindings to expected names on
247 /// the geometry to be executed over. By default the AX attributes will be
248 /// bound to volumes of the same name. Supplying bindings
249 /// for a subset of the attributes will leave the others unchanged.
250 /// AX attributes can only bind to a single volume and vice versa.
251 /// However, in a single set call these can be swapped e.g. a -> b and b -> a.
252 /// When bindings are overriden through subsequent calls to this function,
253 /// any dangling volumes will be automatically bound by name.
254 /// To reset these bindings call get function and create a target set of bindings
255 /// for each attribute of name -> name.
256 void setAttributeBindings(const AttributeBindings& bindings);
257 /// @return The current attribute bindings map
258 const AttributeBindings& getAttributeBindings() const;
259
260 ////////////////////////////////////////////////////////
261
262 // foward declaration of settings for this executable
263 template <bool> struct Settings;
264
265 /// @brief Command Line Interface handling for the VolumeExecutable.
266 /// @details This class wraps the logic for converting commands specific
267 /// to the VolumeExecutable to the internal Settings. Subsequent
268 /// executables can be initialized from the CLI object that gets created.
269 struct OPENVDB_AX_API CLI
270 {
271 ~CLI();
272 CLI(CLI&&);
273 CLI& operator=(CLI&&);
274 static CLI create(size_t argc, const char* argv[], bool* used=nullptr);
275 static void usage(std::ostream& os, const bool verbose);
276 private:
277 friend class VolumeExecutable;
278 CLI();
279 std::unique_ptr<Settings<true>> mSettings;
280 };
281
282 /// @brief Intialize the Settings of this executables from the CLI object
283 /// @param cli The CLI object
284 /// @{
285 void setSettingsFromCLI(const CLI& cli);
286 /// @}
287
288 ////////////////////////////////////////////////////////
289
290 /// @return The tree execution level.
291 OPENVDB_DEPRECATED_MESSAGE("Use getTreeExecutionLevel(Index&, Index&)")
292 Index getTreeExecutionLevel() const;
293
294private:
295 friend class Compiler;
296 friend class ::TestVolumeExecutable;
297
298 /// @brief Constructor, expected to be invoked by the compiler. Should not
299 /// be invoked directly.
300 /// @param context Shared pointer to an llvm:LLVMContext associated with the
301 /// execution engine
302 /// @param engine Shared pointer to an llvm::ExecutionEngine used to build
303 /// functions. Context should be the associated LLVMContext
304 /// @param accessRegistry Registry of volumes accessed by AX code
305 /// @param customData Custom data which will be shared by this executable.
306 /// It can be used to retrieve external data from within the AX code
307 /// @param functions A map of function names to physical memory addresses
308 /// which were built by llvm using engine
309 /// @param tree The AST linked to this executable. The AST is not stored
310 /// after compilation but can be used during construction of the exe to
311 /// infer some pre/post processing optimisations.
312 VolumeExecutable(const std::shared_ptr<const llvm::LLVMContext>& context,
313 const std::shared_ptr<const llvm::ExecutionEngine>& engine,
314 const AttributeRegistry::ConstPtr& accessRegistry,
315 const CustomData::ConstPtr& customData,
316 const std::unordered_map<std::string, uint64_t>& functions,
317 const ast::Tree& tree);
318
319private:
320 // The Context and ExecutionEngine must exist _only_ for object lifetime
321 // management. The ExecutionEngine must be destroyed before the Context
322 const std::shared_ptr<const llvm::LLVMContext> mContext;
323 const std::shared_ptr<const llvm::ExecutionEngine> mExecutionEngine;
324 const AttributeRegistry::ConstPtr mAttributeRegistry;
325 const CustomData::ConstPtr mCustomData;
326 const std::unordered_map<std::string, uint64_t> mFunctionAddresses;
327 std::unique_ptr<Settings<false>> mSettings;
328};
329
330} // namespace ax
331} // namespace OPENVDB_VERSION_NAME
332} // namespace openvdb
333
334#endif // OPENVDB_AX_COMPILER_VOLUME_EXECUTABLE_HAS_BEEN_INCLUDED
335
AttributeBindings.h
The Attribute Bindings class is used by the compiled Executables to handle the mapping of AX Attribut...
AttributeRegistry.h
These classes contain lists of expected attributes and volumes which are populated by compiler during...
CustomData.h
Access to the CustomData class which can provide custom user user data to the OpenVDB AX Compiler.
Grid.h
OPENVDB_AX_API
#define OPENVDB_AX_API
Definition Platform.h:272
OPENVDB_DEPRECATED_MESSAGE
#define OPENVDB_DEPRECATED_MESSAGE(msg)
Definition Platform.h:125
openvdb::v10_0::GridBase
Abstract base class for typed grids.
Definition Grid.h:78
openvdb::v10_0::ax::AttributeBindings
This class wraps an interface for a map of attribute bindings. These map attributes in AX code to con...
Definition AttributeBindings.h:37
openvdb::v10_0::ax::AttributeRegistry
This class stores a list of access names, types and their dependency connections.
Definition AttributeRegistry.h:39
openvdb::v10_0::ax::Compiler
The compiler class. This holds an llvm context and set of compiler options, and constructs executable...
Definition Compiler.h:50
openvdb::v10_0::ax::CustomData
The custom data class is a simple container for named openvdb metadata. Its primary use case is passi...
Definition CustomData.h:34
openvdb::v10_0::ax::VolumeExecutable
Object that encapsulates compiled AX code which can be executed on a collection of VDB volume grids....
Definition VolumeExecutable.h:80
openvdb::v10_0::ax::VolumeExecutable::setActiveTileStreamingGrainSize
void setActiveTileStreamingGrainSize(const size_t g2)
Set the threading grain sizes used when iterating over nodes in a VDB.
openvdb::v10_0::ax::VolumeExecutable::setCreateMissing
void setCreateMissing(const bool flag)
Set the behaviour when missing grids are accessed. Default behaviour is true, which creates them with...
openvdb::v10_0::ax::VolumeExecutable::getAttributeBindings
const AttributeBindings & getAttributeBindings() const
openvdb::v10_0::ax::VolumeExecutable::execute
void execute(openvdb::GridBase &grids) const
Run this volume executable binary on target volumes.
openvdb::v10_0::ax::VolumeExecutable::getTreeExecutionLevel
void getTreeExecutionLevel(Index &min, Index &max) const
Get the tree execution levels.
openvdb::v10_0::ax::VolumeExecutable::getActiveTileStreaming
Streaming getActiveTileStreaming() const
openvdb::v10_0::ax::VolumeExecutable::getValueIterator
IterType getValueIterator() const
openvdb::v10_0::ax::VolumeExecutable::Ptr
std::shared_ptr< VolumeExecutable > Ptr
Definition VolumeExecutable.h:82
openvdb::v10_0::ax::VolumeExecutable::setValueIterator
void setValueIterator(const IterType &iter)
Set the value iterator type to use with this executable. Options are ON, OFF, ALL....
openvdb::v10_0::ax::VolumeExecutable::setActiveTileStreaming
void setActiveTileStreaming(const Streaming &s)
Controls the behaviour of expansion of active tiles.
openvdb::v10_0::ax::VolumeExecutable::setGrainSize
void setGrainSize(const size_t g1)
Set the threading grain sizes used when iterating over nodes in a VDB.
openvdb::v10_0::ax::VolumeExecutable::getActiveTileStreaming
Streaming getActiveTileStreaming(const std::string &name, const ast::tokens::CoreType &type) const
openvdb::v10_0::ax::VolumeExecutable::getGrainSize
size_t getGrainSize() const
openvdb::v10_0::ax::VolumeExecutable::setTreeExecutionLevel
void setTreeExecutionLevel(const Index min, const Index max)
Set the execution level for this executable. This controls what nodes are processed when execute is c...
openvdb::v10_0::ax::VolumeExecutable::~VolumeExecutable
~VolumeExecutable()
openvdb::v10_0::ax::VolumeExecutable::setSettingsFromCLI
void setSettingsFromCLI(const CLI &cli)
Intialize the Settings of this executables from the CLI object.
openvdb::v10_0::ax::VolumeExecutable::Streaming
Streaming
The streaming type of active tiles during execution.
Definition VolumeExecutable.h:197
openvdb::v10_0::ax::VolumeExecutable::getCreateMissing
bool getCreateMissing() const
openvdb::v10_0::ax::VolumeExecutable::setTreeExecutionLevel
void setTreeExecutionLevel(const Index level)
openvdb::v10_0::ax::VolumeExecutable::IterType
IterType
Definition VolumeExecutable.h:210
openvdb::v10_0::ax::VolumeExecutable::execute
void execute(openvdb::GridPtrVec &grids) const
Run this volume executable binary on target volumes.
openvdb::v10_0::ax::VolumeExecutable::setAttributeBindings
void setAttributeBindings(const AttributeBindings &bindings)
Set attribute bindings.
openvdb::v10_0::ax::VolumeExecutable::getActiveTileStreamingGrainSize
size_t getActiveTileStreamingGrainSize() const
openvdb::v10_0::ax::VolumeExecutable::VolumeExecutable
VolumeExecutable(const VolumeExecutable &other)
Copy constructor. Shares the LLVM constructs but deep copies the settings. Multiple copies of an exec...
llvm
Definition Compiler.h:31
openvdb::v10_0::ax::ast::tokens::CoreType
CoreType
Definition Tokens.h:32
openvdb::v10_0::GridPtrVec
std::vector< GridBase::Ptr > GridPtrVec
Definition Grid.h:508
openvdb::v10_0::Index
Index32 Index
Definition Types.h:54
openvdb
Definition Exceptions.h:13
std
Definition Coord.h:587
openvdb::v10_0::ax::VolumeExecutable::CLI
Command Line Interface handling for the VolumeExecutable.
Definition VolumeExecutable.h:270
openvdb::v10_0::ax::VolumeExecutable::CLI::CLI
CLI(CLI &&)
openvdb::v10_0::ax::VolumeExecutable::CLI::operator=
CLI & operator=(CLI &&)
openvdb::v10_0::ax::VolumeExecutable::CLI::usage
static void usage(std::ostream &os, const bool verbose)
openvdb::v10_0::ax::VolumeExecutable::CLI::create
static CLI create(size_t argc, const char *argv[], bool *used=nullptr)
openvdb::v10_0::ax::VolumeExecutable::CLI::~CLI
~CLI()
openvdb::v10_0::ax::VolumeExecutable::Settings
Definition VolumeExecutable.h:263
OPENVDB_VERSION_NAME
#define OPENVDB_VERSION_NAME
The version namespace name for this library version.
Definition version.h.in:121
OPENVDB_USE_VERSION_NAMESPACE
#define OPENVDB_USE_VERSION_NAMESPACE
Definition version.h.in:212