ComputeProcessor resampling one scalar field of a VolumeGridBuffer into the corner grid layout the marching cubes stage consumes. More...

#include <VolumeSurfaceProcessor.hpp>

Inheritance diagram for MayaFlux::Buffers::VolumeSurfaceProcessor:

Collaboration diagram for MayaFlux::Buffers::VolumeSurfaceProcessor:

Classes
struct	SurfaceParams
	Push constant block the resample shader receives. More...

Public Member Functions
uint32_t	corner_count () const noexcept
	Corner count of the grid, one greater per axis than the extraction resolution.

const Kinesis::Lattice3D &	get_lattice () const
	The extraction lattice.

uint32_t	get_res_x () const
	Extraction cell count along X.

uint32_t	get_res_y () const
	Extraction cell count along Y.

uint32_t	get_res_z () const
	Extraction cell count along Z.

float	get_threshold () const
	Field value the surface is placed at.

std::shared_ptr< VKBuffer >	grid_buf () const
	The corner grid this stage writes.

void	set_threshold (float threshold)
	Set the field value the surface is placed at.

	VolumeSurfaceProcessor (std::shared_ptr< VolumeGridBuffer > volume, std::string field_name, Kinesis::Lattice3D lattice, float threshold, const std::string &shader_path="volume_to_sdf_grid.comp.spv")
	Construct a surface extraction bridge.

uint32_t	worst_case_vertices () const noexcept
	Upper bound on vertices mc_emit can produce at this resolution.

	~VolumeSurfaceProcessor () override=default

Public Member Functions inherited from MayaFlux::Buffers::ComputeProcessor
	ComputeProcessor (const Portal::Graphics::ShaderSpec &spec)
	Construct processor from a generated ShaderSpec.

	ComputeProcessor (const std::string &shader_path, uint32_t workgroup_x=256)
	Construct processor with shader path.

const ShaderDispatchConfig &	get_dispatch_config () const
	Get current dispatch configuration.

uint32_t	get_iteration_count () const
	Dispatches recorded per execute cycle.

bool	is_pipeline_ready () const
	Check if pipeline is created.

void	set_custom_dispatch (std::function< std::array< uint32_t, 3 >(const std::shared_ptr< VKBuffer > &)> calculator)
	Set custom dispatch calculator.

void	set_dispatch_mode (ShaderDispatchConfig::DispatchMode mode)
	Set dispatch mode.

void	set_iteration_count (uint32_t count)
	Set how many dispatches are recorded per execute cycle.

void	set_manual_dispatch (uint32_t x, uint32_t y=1, uint32_t z=1)
	Set manual dispatch group counts.

void	set_workgroup_size (uint32_t x, uint32_t y=1, uint32_t z=1)
	Set workgroup size (should match shader local_size)

Public Member Functions inherited from MayaFlux::Buffers::ShaderProcessor
void	add_binding (const std::string &descriptor_name, const ShaderBinding &binding)
	Add descriptor binding configuration.

bool	are_bindings_complete () const
	Check if all required bindings are satisfied.

bool	are_descriptors_ready () const
	Check if descriptors are initialized.

void	auto_bind_buffer (const std::shared_ptr< VKBuffer > &buffer)
	Auto-bind buffer based on attachment order.

void	bind_buffer (const std::string &descriptor_name, const std::shared_ptr< VKBuffer > &buffer)
	Bind a VKBuffer to a named shader descriptor.

void	clear_specialization_constants ()
	Clear all specialization constants.

template<typename T >
bool	download_bound (const std::string &descriptor_name, std::vector< T > &data) const

bool	download_bound (const std::string &descriptor_name, void *data, size_t size, const std::shared_ptr< VKBuffer > &staging=nullptr) const
	Download the buffer currently bound to a named descriptor.

void	feed (const std::string &name, FeedSource source)
	Supply a shader input from a callable, resolved by name.

void	feed (const std::string &name, FeedSource source, uint32_t offset, size_t size=sizeof(float))
	Supply a push constant from a callable at an explicit offset.

std::vector< std::string >	get_binding_names () const
	Get all configured descriptor names.

std::shared_ptr< VKBuffer >	get_bound_buffer (const std::string &descriptor_name) const
	Get bound buffer for a descriptor name.

size_t	get_bound_buffer_count () const
	Get number of bound buffers.

virtual BufferUsageHint	get_buffer_usage_hint (const std::string &descriptor_name) const
	Get buffer usage hint for a descriptor.

const ShaderConfig &	get_config () const
	Get current configuration.

std::vector< std::string >	get_feed_names () const
	Names of every registered feed.

virtual std::shared_ptr< VKBuffer >	get_output_buffer () const
	Get the output buffer after compute dispatch.

std::vector< uint8_t > &	get_push_constant_data ()

const std::vector< uint8_t > &	get_push_constant_data () const
	Get current push constant data.

const std::string &	get_shader_path () const
	Get current shader path.

bool	has_binding (const std::string &descriptor_name) const
	Check if a descriptor binding exists.

virtual bool	has_executed () const
	Check if compute has been executed at least once.

bool	has_feed (const std::string &name) const
	Whether a feed of this name is registered.

bool	hot_reload_shader ()
	Hot-reload shader from ShaderFoundry.

bool	is_compatible_with (const std::shared_ptr< Buffer > &buffer) const override
	Checks if this processor can handle the specified buffer type.

bool	is_deferred_submission () const
	Whether this processor submits asynchronously.

bool	is_dispatch_pending () const
	True while an asynchronous submission is outstanding.

virtual bool	is_in_place_operation (const std::string &descriptor_name) const
	Check if shader modifies a specific buffer in-place.

bool	is_shader_loaded () const
	Check if shader is loaded.

void	on_detach (const std::shared_ptr< Buffer > &buffer) override
	Called when this processor is detached from a buffer.

void	remove_feed (const std::string &name)
	Remove a feed.

bool	resolve_pending_dispatch (bool block)
	Resolve an outstanding asynchronous submission.

void	set_config (const ShaderConfig &config)
	Update entire configuration.

void	set_deferred_submission (bool deferred)
	Submit asynchronously and resolve at the top of a later cycle.

template<typename T >
void	set_push_constant_data (const T &data)
	Update push constant data (type-safe)

virtual void	set_push_constant_data_raw (const void *data, size_t size)
	Update push constant data (raw bytes)

template<typename T >
void	set_push_constant_size ()
	Set push constant size from type.

void	set_push_constant_size (size_t size)
	Set push constant size.

void	set_shader (const std::string &shader_path)
	Update shader path and reload.

void	set_specialization_constant (uint32_t constant_id, uint32_t value)
	Set specialization constant.

	ShaderProcessor (const std::string &shader_path)
	Construct processor with shader path.

	ShaderProcessor (ShaderConfig config)
	Construct processor with full configuration.

void	unbind_buffer (const std::string &descriptor_name)
	Unbind a buffer from a descriptor.

	~ShaderProcessor () override

Public Member Functions inherited from MayaFlux::Buffers::BufferProcessor
virtual ProcessingToken	get_processing_token () const
	Gets the current processing token for this buffer.

void	process (const std::shared_ptr< Buffer > &buffer)
	Applies a computational transformation to the data in the provided buffer.

virtual void	set_processing_token (ProcessingToken token)
	Gets the preferred processing backend for this processor.

virtual	~BufferProcessor ()=default
	Virtual destructor for proper cleanup of derived classes.

Protected Member Functions
void	on_attach (const std::shared_ptr< Buffer > &buffer) override
	Validate the named field, bind the grid, and size the dispatch.

bool	on_before_execute (Portal::Graphics::CommandBufferID cmd_id, const std::shared_ptr< VKBuffer > &buffer) override
	Reject buffers that are not VolumeGridBuffer.

void	on_descriptors_created () override
	Write the field descriptor for the current slot assignment.

void	processing_function (const std::shared_ptr< Buffer > &buffer) override
	Write the field descriptor for this cycle's slot assignment, then run the normal shader processing path.

Protected Member Functions inherited from MayaFlux::Buffers::ComputeProcessor
virtual std::array< uint32_t, 3 >	calculate_dispatch_size (const std::shared_ptr< VKBuffer > &buffer)
	Calculate dispatch size from buffer.

void	cleanup () override

void	initialize_descriptors (const std::shared_ptr< VKBuffer > &buffer) override

void	initialize_pipeline (const std::shared_ptr< VKBuffer > &buffer) override

virtual bool	on_iteration (Portal::Graphics::CommandBufferID cmd_id, const std::shared_ptr< VKBuffer > &buffer, uint32_t index)
	Called before each iteration's push constants and dispatch.

virtual void	on_iteration_barrier (Portal::Graphics::CommandBufferID cmd_id, const std::shared_ptr< VKBuffer > &buffer, uint32_t index)
	Called after each iteration except the last.

Protected Member Functions inherited from MayaFlux::Buffers::ShaderProcessor
virtual void	on_after_execute (Portal::Graphics::CommandBufferID cmd_id, const std::shared_ptr< VKBuffer > &buffer)
	Called after each process callback.

virtual void	on_before_compile (const std::string &shader_path)
	Called before shader compilation.

virtual void	on_before_descriptors_create ()
	Called before descriptor sets are created.

virtual void	on_before_pipeline_create (Portal::Graphics::ComputePipelineID pipeline_id)
	Called before pipeline creation.

virtual void	on_dispatch_complete (const std::shared_ptr< VKBuffer > &buffer)
	Called once when an asynchronous submission is observed complete.

virtual void	on_pipeline_created (Portal::Graphics::ComputePipelineID pipeline_id)
	Called after pipeline is created.

virtual void	on_shader_loaded (Portal::Graphics::ShaderID shader_id)
	Called after shader is loaded.

void	pump_feeds ()
	Pull every feed and write its result.

std::optional< uint32_t >	resolve_ds_index (uint32_t set) const
	Resolve logical descriptor set index to actual index.

size_t	resolve_push_constant_size (const std::shared_ptr< VKBuffer > &buffer) const
	Byte width of this processor's push constant block, extended to cover any fragment staged on the buffer.

std::vector< uint8_t >	resolve_push_constants (const std::shared_ptr< VKBuffer > &buffer) const
	This processor's push constant data with buffer-staged fragments overlaid at their declared offsets.

void	submit_recorded (Portal::Graphics::CommandBufferID cmd_id, const std::shared_ptr< VKBuffer > &buffer)
	Submit a recorded command buffer honoring the submission mode.

virtual void	update_descriptors (const std::shared_ptr< VKBuffer > &buffer)

Protected Member Functions inherited from MayaFlux::Buffers::VKBufferProcessor
void	ensure_initialized (const std::shared_ptr< VKBuffer > &buffer)

void	initialize_buffer_service ()

void	initialize_compute_service ()

Private Member Functions
void	rebuild_grid_buffer ()
	Allocate the corner grid buffer for the current resolution.

void	write_field_descriptor ()
	Issue the direct ShaderFoundry descriptor write for the field read slot.

void	write_params ()
	Size the push constant block to at least SurfaceParams and write the lattice dimensions, extraction resolution, and threshold.

Private Attributes
std::string	m_field_name

std::shared_ptr< VKBuffer >	m_grid_buf

Kinesis::Lattice3D	m_lattice

float	m_threshold

std::shared_ptr< VolumeGridBuffer >	m_volume
	The attached volume, cached for the descriptor write.

Additional Inherited Members
Public Types inherited from MayaFlux::Buffers::ShaderProcessor
enum class	BufferUsageHint : uint8_t { NONE = 0 , INPUT_READ = 1 << 0 , OUTPUT_WRITE = 1 << 1 , BIDIRECTIONAL = INPUT_READ \| OUTPUT_WRITE }
	Get buffer usage characteristics needed for safe data flow. More...

using	FeedSource = std::function< FeedValue()>
	A callable pulled once per processing cycle.

using	FeedValue = std::variant< double, Kakshya::DataVariant >
	What a feed callable returns.

Protected Attributes inherited from MayaFlux::Buffers::ShaderProcessor
size_t	m_auto_bind_index {}

std::unordered_map< std::string, std::shared_ptr< VKBuffer > >	m_bound_buffers

ShaderConfig	m_config

bool	m_deferred_submission {}
	False submits synchronously, preserving pre-existing behaviour.

std::vector< Portal::Graphics::DescriptorSetID >	m_descriptor_set_ids

bool	m_engine_owns_set_zero {}
	Whether the engine reserves set=0 for global resources.

bool	m_initialized {}

Portal::Graphics::CommandBufferID	m_last_command_buffer = Portal::Graphics::INVALID_COMMAND_BUFFER

std::shared_ptr< VKBuffer >	m_last_processed_buffer

bool	m_needs_descriptor_rebuild = true

bool	m_needs_pipeline_rebuild = true

std::shared_ptr< VKBuffer >	m_pending_buffer
	Buffer retained for the outstanding submission.

Portal::Graphics::FenceID	m_pending_fence { Portal::Graphics::INVALID_FENCE }
	Outstanding async submission, if any.

std::vector< uint8_t >	m_push_constant_data

Portal::Graphics::ShaderID	m_shader_id = Portal::Graphics::INVALID_SHADER

Protected Attributes inherited from MayaFlux::Buffers::VKBufferProcessor
Registry::Service::BufferService *	m_buffer_service = nullptr

Registry::Service::ComputeService *	m_compute_service = nullptr

Protected Attributes inherited from MayaFlux::Buffers::BufferProcessor
ProcessingToken	m_processing_token { ProcessingToken::AUDIO_BACKEND }

Detailed Description

ComputeProcessor resampling one scalar field of a VolumeGridBuffer into the corner grid layout the marching cubes stage consumes.

VolumeGridBuffer stores one value per cell centre; mc_emit.comp reads one value per lattice corner, of which there are (res+1) on each axis. This stage bridges the two by trilinear resampling, which also decouples the extraction resolution from the simulation resolution: surfacing a 128 cube simulation at 64 costs a quarter of the triangles.

Marching cubes crosses at iso_level with the interior conventionally negative, while a density field is high inside. The shader therefore writes threshold minus density, placing the surface where density equals threshold with negative interior, so the consuming SDFMeshProcessor runs at iso_level zero.

Owns the corner grid buffer. SDFPrepProcessor is not needed on this path: every corner is written each cycle, and SDFMeshProcessor zeroes the atomic counter itself.

Chain order: flat[n] - the volume simulation stages flat[n+1] - VolumeSurfaceProcessor (field -> corner grid) flat[n+2] - SDFMeshProcessor (corner grid -> vertices) final - RenderProcessor

The attached buffer must be the VolumeGridBuffer for the field read to resolve, but the vertex output belongs to whichever buffer SDFMeshProcessor is attached to.

Definition at line 41 of file VolumeSurfaceProcessor.hpp.

The documentation for this class was generated from the following files:

Classes

Public Member Functions

Protected Member Functions

Private Member Functions

Private Attributes

Additional Inherited Members

Detailed Description