ViewPortSmoothShaderLogic

GPU compute shader that performs viewport-space point smoothing and filtering. More...

Collaboration diagram for ViewPortSmoothShaderLogic:

Classes
struct	UBO
	Uniform buffer object layout for the viewport smooth compute shader. More...

Public Member Functions
void	buildShader ()
	Compile and link the compute shader program.
void	createUBOBuffer ()
	Create the GPU uniform buffer object for shader parameters.
template<class t_point_type>
void	getInput (PointContainer< t_point_type > &active, PointContainer< t_point_type > &inactive, uint04 record_weight)
	Read back smoothed points from the GPU, partitioning into active and inactive sets.
void	runAll (uint04 count)
	Dispatch the compute shader over the given number of points.
void	setQtGL (QOpenGLFunctions_4_3_Core *gl)
	Set the OpenGL function pointer table used by this shader.
void	setUBO (const UBO &u)
	Upload uniform buffer data to the GPU.
template<class t_point_type>
void	uploadInputs (const PointContainer< t_point_type > &active, uint04 pix_count)
	Upload point cloud data to GPU storage buffers for the smooth pass.

Static Public Member Functions
static void	ReadBytes (QOpenGLFunctions_4_3_Core *gl, GLenum target, GLuint buf, void *dst, GLsizeiptr bytes)
	Read bytes from a GPU buffer into CPU memory.

Protected Attributes
Buffer< RGBColor >	m_colors
	CPU-side color buffer for GPU upload/download.
GLuint	m_csA = 0
	Compute shader handle.
uint04	m_last_size = 0
	Number of points in the last upload.
uint04	m_out_size = 0
	Allocated size of the output index buffer.
uint04	m_px_key_size = 0
	Allocated size of the per-pixel key buffer.
QOpenGLShaderProgram *	m_shader
	Compiled compute shader program.
GLuint	m_ssboInColor = 0
	Input color storage buffer.
GLuint	m_ssboInPos = 0
	Input position storage buffer.
GLuint	m_ssboInW = 0
	Input weight storage buffer.
GLuint	m_ssboOutIdx = 0
	Output index buffer indicating kept points.
GLuint	m_ssboPxKey = 0
	Per-pixel key buffer for duplicate detection.
Buffer< uint04 >	m_temp_idx
	CPU-side copy of the output index buffer.
GLuint	m_uboU = 0
	Uniform buffer object handle.

Detailed Description

GPU compute shader that performs viewport-space point smoothing and filtering.

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Projects existing point cloud data into the current camera viewport, identifies duplicate and overlapping points, and produces a filtered set of active points along with newly-matured inactive points that exceed a recording weight threshold.

Definition at line 15 of file ViewPortSmoothShaderLogic.h.

Member Function Documentation

getInput()

template<class t_point_type>

void ViewPortSmoothShaderLogic::getInput ( PointContainer< t_point_type > & active, PointContainer< t_point_type > & inactive, uint04 record_weight )

inline

Read back smoothed points from the GPU, partitioning into active and inactive sets.

Parameters

[in,out]	active	Points that remain in the live display.
[in,out]	inactive	Points that have matured past the recording weight threshold.
[in]	record_weight	Weight threshold above which points are moved to inactive.

Definition at line 71 of file ViewPortSmoothShaderLogic.h.

References Buffer< t_type, t_memory_manager >::add(), PointContainer< t_point_type >::data, PointContainer< t_point_type >::locations, m_colors, m_last_size, m_ssboInColor, m_ssboInPos, m_ssboInW, m_ssboOutIdx, m_temp_idx, PointContainer< t_point_type >::setSize(), PointContainer< t_point_type >::size(), and PointContainer< t_point_type >::weights.

ReadBytes()

void ViewPortSmoothShaderLogic::ReadBytes ( QOpenGLFunctions_4_3_Core * gl, GLenum target, GLuint buf, void * dst, GLsizeiptr bytes )

static

Read bytes from a GPU buffer into CPU memory.

Parameters

[in]	gl	OpenGL function table.
[in]	target	Buffer target (e.g. GL_SHADER_STORAGE_BUFFER).
[in]	buf	GPU buffer handle.
[out]	dst	Destination CPU memory.
[in]	bytes	Number of bytes to read.

runAll()

void ViewPortSmoothShaderLogic::runAll

(

uint04

count

)

Dispatch the compute shader over the given number of points.

Parameters

[in]

count

Number of input points to process.

setQtGL()

void ViewPortSmoothShaderLogic::setQtGL

(

QOpenGLFunctions_4_3_Core *

gl

)

Set the OpenGL function pointer table used by this shader.

Parameters

[in]

gl

Pointer to the OpenGL 4.3 core functions.

setUBO()

void ViewPortSmoothShaderLogic::setUBO

(

const UBO &

u

)

Upload uniform buffer data to the GPU.

Parameters

[in]

u

The uniform buffer contents to upload.

uploadInputs()

template<class t_point_type>

void ViewPortSmoothShaderLogic::uploadInputs ( const PointContainer< t_point_type > & active, uint04 pix_count )

inline

Upload point cloud data to GPU storage buffers for the smooth pass.

Parameters

[in]	active	The current active point container to upload.
[in]	pix_count	Total number of viewport pixels for the per-pixel key buffer.

Definition at line 110 of file ViewPortSmoothShaderLogic.h.

References PointContainer< t_point_type >::data, PointContainer< t_point_type >::locations, m_colors, m_last_size, m_out_size, m_px_key_size, m_ssboInColor, m_ssboInPos, m_ssboInW, m_ssboOutIdx, m_ssboPxKey, PointContainer< t_point_type >::size(), and PointContainer< t_point_type >::weights.

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

• RasterPointScanner/Headers/ViewPortSmoothShaderLogic.h