SplatCloudNode.cc 19.6 KB
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/*===========================================================================*\
*                                                                            *
*                              OpenFlipper                                   *
*      Copyright (C) 2001-2011 by Computer Graphics Group, RWTH Aachen       *
*                           www.openflipper.org                              *
*                                                                            *
*--------------------------------------------------------------------------- *
*  This file is part of OpenFlipper.                                         *
*                                                                            *
*  OpenFlipper is free software: you can redistribute it and/or modify       *
*  it under the terms of the GNU Lesser General Public License as            *
*  published by the Free Software Foundation, either version 3 of            *
*  the License, or (at your option) any later version with the               *
*  following exceptions:                                                     *
*                                                                            *
*  If other files instantiate templates or use macros                        *
*  or inline functions from this file, or you compile this file and          *
*  link it with other files to produce an executable, this file does         *
*  not by itself cause the resulting executable to be covered by the         *
*  GNU Lesser General Public License. This exception does not however        *
*  invalidate any other reasons why the executable file might be             *
*  covered by the GNU Lesser General Public License.                         *
*                                                                            *
*  OpenFlipper is distributed in the hope that it will be useful,            *
*  but WITHOUT ANY WARRANTY; without even the implied warranty of            *
*  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the             *
*  GNU Lesser General Public License for more details.                       *
*                                                                            *
*  You should have received a copy of the GNU LesserGeneral Public           *
*  License along with OpenFlipper. If not,                                   *
*  see <http://www.gnu.org/licenses/>.                                       *
*                                                                            *
\*===========================================================================*/

/*===========================================================================*\
*                                                                            *
*   $Revision$                                                       *
*   $LastChangedBy$                                                *
*   $Date$                     *
*                                                                            *
\*===========================================================================*/

//================================================================
//
//  CLASS SplatCloudNode - IMPLEMENTATION
//
//================================================================


//== INCLUDES ====================================================


#include "SplatCloudNode.hh"


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//== DEFINES =====================================================


//#define REPORT_VBO_UPDATES


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//== NAMESPACES ==================================================


namespace ACG {
namespace SceneGraph {


//== IMPLEMENTATION ==============================================


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SplatCloudNode::SplatCloudNode( const SplatCloud &_splatCloud, BaseNode *_parent, std::string _name ) : 
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	BaseNode            ( _parent, _name ), 
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	splatCloud_         ( _splatCloud ), 
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	pointsModified_     ( false ), 
	normalsModified_    ( false ), 
	pointsizesModified_ ( false ), 
	colorsModified_     ( false ), 
	selectionsModified_ ( false ), 
	pickColorsModified_ ( false ), 
	defaultNormal_      ( Normal(0.0f,0.0f,1.0f) ), 
	defaultPointsize_   ( Pointsize(0.01f) ), 
	defaultColor_       ( Color(255,255,255) ), 
	splatsDrawMode_     ( DrawModes::NONE ), 
	dotsDrawMode_       ( DrawModes::NONE ), 
	pointsDrawMode_     ( DrawModes::NONE ), 
	pickingBaseIndex_   ( 0 ), 
	vboGlId_            ( 0 ), 
	vboNumPoints_       ( 0 ), 
	vboData_            ( 0 ), 
	vboPointsOffset_    ( -1 ), 
	vboNormalsOffset_   ( -1 ), 
	vboPointsizesOffset_( -1 ), 
	vboColorsOffset_    ( -1 ), 
	vboSelectionsOffset_( -1 ), 
	vboPickColorsOffset_( -1 ) 
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{
	// add (possibly) new drawmodes
	pointsDrawMode_ = DrawModes::addDrawMode( "Points" );
	dotsDrawMode_   = DrawModes::addDrawMode( "Dots"   );
	splatsDrawMode_ = DrawModes::addDrawMode( "Splats" );

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	// create a new VBO (will be invalid and rebuilt the next time drawn (or picked))
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	createVBO();
}


//----------------------------------------------------------------


SplatCloudNode::~SplatCloudNode()
{
	destroyVBO();
}


//----------------------------------------------------------------


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void SplatCloudNode::boundingBox( ACG::Vec3d &_bbMin, ACG::Vec3d &_bbMax )
{
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    ACG::Vec3f bbMin( FLT_MAX, FLT_MAX, FLT_MAX );
    ACG::Vec3f bbMax(-FLT_MAX,-FLT_MAX,-FLT_MAX );
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    SplatCloud::PointVector::const_iterator pointIter, pointsEnd = splatCloud_.points().end();
    for ( pointIter = splatCloud_.points().begin(); pointIter != pointsEnd; ++pointIter )
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    {
        const Point &p = *pointIter;
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        ACG::Vec3f acgp( p[0], p[1], p[2] );
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        bbMin.minimize( acgp );
        bbMax.maximize( acgp );
    }
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    _bbMin.minimize( ACG::Vec3d( bbMin ) );
    _bbMax.maximize( ACG::Vec3d( bbMax ) );
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}


//----------------------------------------------------------------

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void SplatCloudNode::draw( GLState &_state, const DrawModes::DrawMode &_drawMode )
{
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	static const int RENDERMODE_POINTS = 0;
	static const int RENDERMODE_DOTS   = 1;
	static const int RENDERMODE_SPLATS = 2;

	// check if drawmode is valid
	int rendermode;
	if( _drawMode.containsAtomicDrawMode( splatsDrawMode_ ) )
		rendermode = RENDERMODE_SPLATS;
	else if( _drawMode.containsAtomicDrawMode( dotsDrawMode_ ) )
		rendermode = RENDERMODE_DOTS;
	else if( _drawMode.containsAtomicDrawMode( pointsDrawMode_ ) )
		rendermode = RENDERMODE_POINTS;
	else
		return;

	// set desired depth function
	ACG::GLState::depthFunc( _state.depthFunc() );

	// if VBO is invalid or was (partially) modified, then rebuild
	if( !vboData_ || vboModified() )
		rebuildVBO( _state );

	// if VBO is valid...
	if( vboData_ )
	{
		// activate VBO
		ACG::GLState::bindBufferARB( GL_ARRAY_BUFFER_ARB, vboGlId_ );

		// enable arrays:
		// --------------

		// points
		if( vboPointsOffset_ != -1 )
		{
			ACG::GLState::enableClientState( GL_VERTEX_ARRAY );
			ACG::GLState::vertexPointer( 3, GL_FLOAT, 0, (unsigned char *) 0 + vboPointsOffset_ );
		}
		else
		{
			ACG::GLState::disableClientState( GL_VERTEX_ARRAY );
		}

		// normals
		if( vboNormalsOffset_ != -1 )
		{
			ACG::GLState::enableClientState( GL_NORMAL_ARRAY );
			ACG::GLState::normalPointer( GL_FLOAT, 0, (unsigned char *) 0 + vboNormalsOffset_ );
		}
		else
		{
			ACG::GLState::disableClientState( GL_NORMAL_ARRAY );
			glNormal3f( defaultNormal_[0], defaultNormal_[1], defaultNormal_[2] );
		}

		// pointsizes
		if( vboPointsizesOffset_ != -1 )
		{
			glClientActiveTexture( GL_TEXTURE0 ); // TODO: use ACG::GLState::clientActiveTexture() when implemented
			ACG::GLState::enableClientState( GL_TEXTURE_COORD_ARRAY );
			ACG::GLState::texcoordPointer( 1, GL_FLOAT, 0, (unsigned char *) 0 + vboPointsizesOffset_ );
		}
		else
		{
			glClientActiveTexture( GL_TEXTURE0 ); // TODO: use ACG::GLState::clientActiveTexture() when implemented
			ACG::GLState::disableClientState( GL_TEXTURE_COORD_ARRAY );
			glMultiTexCoord1f( GL_TEXTURE0, defaultPointsize_ );
		}

		// colors
		if( vboColorsOffset_ != -1 )
		{
			ACG::GLState::enableClientState( GL_SECONDARY_COLOR_ARRAY );
			glSecondaryColorPointer( 3, GL_UNSIGNED_BYTE, 0, (unsigned char *) 0 + vboColorsOffset_ ); // TODO: use ACG::GLState::secondaryColorPointer() when implemented
		}
		else
		{
			ACG::GLState::disableClientState( GL_SECONDARY_COLOR_ARRAY );
			glSecondaryColor3ub( defaultColor_[0], defaultColor_[1], defaultColor_[2] );
		}

		// selections
		if( vboSelectionsOffset_ != -1 )
		{
			glClientActiveTexture( GL_TEXTURE1 ); // TODO: use ACG::GLState::clientActiveTexture() when implemented
			ACG::GLState::enableClientState( GL_TEXTURE_COORD_ARRAY );
			ACG::GLState::texcoordPointer( 1, GL_FLOAT, 0, (unsigned char *) 0 + vboSelectionsOffset_ );
		}
		else
		{
			glClientActiveTexture( GL_TEXTURE1 ); // TODO: use ACG::GLState::clientActiveTexture() when implemented
			ACG::GLState::disableClientState( GL_TEXTURE_COORD_ARRAY );
			glMultiTexCoord1f( GL_TEXTURE1, 0.0f );
		}

		// pick colors
		if( vboPickColorsOffset_ != -1 )
		{
			ACG::GLState::enableClientState( GL_COLOR_ARRAY );
			ACG::GLState::colorPointer( 4, GL_UNSIGNED_BYTE, 0, (unsigned char *) 0 + vboPickColorsOffset_ );
		}
		else
		{
			ACG::GLState::disableClientState( GL_COLOR_ARRAY );
			glColor4ub( 255, 255, 255, 255 );
		}

		// --------------

		// enable "pointsize by program" depending on current rendermode
		if( rendermode == RENDERMODE_SPLATS || rendermode == RENDERMODE_DOTS )
			ACG::GLState::enable( GL_VERTEX_PROGRAM_POINT_SIZE );

		// draw as GLpoints
		glDrawArrays( GL_POINTS, 0, vboNumPoints_ );

		// disable arrays:
		// ---------------

		// points
		ACG::GLState::disableClientState( GL_VERTEX_ARRAY );

		// normals
		ACG::GLState::disableClientState( GL_NORMAL_ARRAY );

		// pointsizes
		glClientActiveTexture( GL_TEXTURE0 ); // TODO: use ACG::GLState::clientActiveTexture() when implemented
		ACG::GLState::disableClientState( GL_TEXTURE_COORD_ARRAY );

		// colors
		ACG::GLState::disableClientState( GL_SECONDARY_COLOR_ARRAY );

		// selections
		glClientActiveTexture( GL_TEXTURE1 ); // TODO: use ACG::GLState::clientActiveTexture() when implemented
		ACG::GLState::disableClientState( GL_TEXTURE_COORD_ARRAY );

		// pick colors
		ACG::GLState::disableClientState( GL_COLOR_ARRAY );

		// ---------------

		// disable "pointsize by program"
		ACG::GLState::disable( GL_VERTEX_PROGRAM_POINT_SIZE );

		// make defaults current again
		glClientActiveTexture( GL_TEXTURE0 ); // TODO: use ACG::GLState::clientActiveTexture() when implemented
		glColor4f         ( 1.0f, 1.0f, 1.0f, 1.0f );
		glSecondaryColor3f( 1.0f, 1.0f, 1.0f );

		// deactivate VBO
		ACG::GLState::bindBufferARB( GL_ARRAY_BUFFER_ARB, 0 );
	}
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}


//----------------------------------------------------------------


// TODO: hack, because pick() doesn't get a drawmode
static DrawModes::DrawMode g_pickDrawMode;
void SplatCloudNode::enterPick( GLState &_state, PickTarget _target, const DrawModes::DrawMode &_drawMode )
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{
    g_pickDrawMode = _drawMode;
}
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// ----

void SplatCloudNode::pick( GLState &_state, PickTarget _target )
{
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	// if pick target is valid...
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	if( _target == PICK_ANYTHING || _target == PICK_VERTEX )
	{
		// set number of pick colors used (each points gets a unique pick color)
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		if( !_state.pick_set_maximum( splatCloud_.numPoints() ) ) // number of points could have changed, so use new number of points (*not* the one in VBO memory!)
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		{
			std::cerr << "SplatCloudNode::pick() : Color range too small, picking failed." << std::endl;
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			return;
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		}
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		// if in color picking mode...
		if( _state.color_picking() )
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		{
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			// if picking base index has changed, rebuild pick colors block in VBO so new pick colors will be used
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			if( pickingBaseIndex_ != _state.pick_current_index() )
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			{
				pickColorsModified_ = true;
			}
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			// TODO: see above ( enterPick() )
			draw( _state, g_pickDrawMode );
		}
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	}
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}


//----------------------------------------------------------------


void SplatCloudNode::createVBO()
{
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	// create new VBO (if *not* already existing)
	if( vboGlId_ == 0 )
	{
		glGenBuffersARB( 1, &vboGlId_ );
		vboNumPoints_ = 0;
		vboData_      = 0;

		modifiedAll(); // (re-)build all data block in VBO memory the first time
	}
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}


//----------------------------------------------------------------


void SplatCloudNode::destroyVBO()
{
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	// delete VBO (if existing)
	if( vboGlId_ != 0 )
	{
		glDeleteBuffersARB( 1, &vboGlId_ );
		vboGlId_      = 0;
		vboNumPoints_ = 0;
		vboData_      = 0;
	}
}


//----------------------------------------------------------------


void SplatCloudNode::rebuildVBO( GLState &_state )
{
	// if something went wrong in the initialization, make VBO invalid and abort
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	if( vboGlId_ == 0 )
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	{
		vboData_ = 0;
		return;
	}
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	// activate VBO
	ACG::GLState::bindBufferARB( GL_ARRAY_BUFFER_ARB, vboGlId_ );

	// calculate size of data and offsets
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	unsigned int numPoints = splatCloud_.numPoints();
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	unsigned int size      = 0;

	int pointsOffset     = -1;
	int normalsOffset    = -1;
	int pointsizesOffset = -1;
	int colorsOffset     = -1;
	int selectionsOffset = -1;
	int pickColorsOffset = -1;

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	if( splatCloud_.hasPoints()     ) { pointsOffset     = size; size += numPoints * 12; }
	if( splatCloud_.hasNormals()    ) { normalsOffset    = size; size += numPoints * 12; }
	if( splatCloud_.hasPointsizes() ) { pointsizesOffset = size; size += numPoints * 4;  }
	if( splatCloud_.hasColors()     ) { colorsOffset     = size; size += numPoints * 3;  }
	if( splatCloud_.hasSelections() ) { selectionsOffset = size; size += numPoints * 4;  }
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	/* has pick colors = true       */ { pickColorsOffset = size; size += numPoints * 4;  }

	// tell GL that we are seldomly updating the VBO but are often drawing it
	glBufferDataARB( GL_ARRAY_BUFFER_ARB, size, 0, GL_STATIC_DRAW_ARB );

	// get pointer to VBO memory
	unsigned char *data = (unsigned char *) glMapBufferARB( GL_ARRAY_BUFFER_ARB, GL_WRITE_ONLY_ARB );

	// check if something went wrong during VBO mapping
	if( !data )
	{
		std::cout << "SplatCloudNode::rebuildVBO() : glMapBufferARB() failed." << std::endl;
		vboData_ = 0;
		return;
	}

	// if VBO memory block was moved or the internal block structure has to be changed, rebuild entire VBO
	if( vboData_ != data || vboStructureModified() )
	{
		vboNumPoints_ = numPoints;
		vboData_      = data;

		vboPointsOffset_     = pointsOffset;
		vboNormalsOffset_    = normalsOffset;
		vboPointsizesOffset_ = pointsizesOffset;
		vboColorsOffset_     = colorsOffset;
		vboSelectionsOffset_ = selectionsOffset;
		vboPickColorsOffset_ = pickColorsOffset;

		// mark all data block to rebuild them lateron
		modifiedAll();
	}

	// if in color picking mode...
	if( _state.color_picking() )
	{
		// store picking base index
		pickingBaseIndex_ = _state.pick_current_index();
	}

	// rebuild data blocks if needed
	if( pointsModified_     ) rebuildVBOPoints();
	if( normalsModified_    ) rebuildVBONormals();
	if( pointsizesModified_ ) rebuildVBOPointsizes();
	if( colorsModified_     ) rebuildVBOColors();
	if( selectionsModified_ ) rebuildVBOSelections();
	if( pickColorsModified_ ) rebuildVBOPickColors( _state );

#	ifdef REPORT_VBO_UPDATES
	std::cout << std::endl;
#	endif

	// every block in VBO memory has been updated
	pointsModified_     = false;
	normalsModified_    = false;
	pointsizesModified_ = false;
	colorsModified_     = false;
	selectionsModified_ = false;
	pickColorsModified_ = false;

	// release pointer to VBO memory. if something went wrong, make VBO invalid and abort
	if( !glUnmapBufferARB( GL_ARRAY_BUFFER_ARB ) )
	{
		vboData_ = 0;
		return;
	}

	// deactivate VBO
	ACG::GLState::bindBufferARB( GL_ARRAY_BUFFER_ARB, 0 );
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}


//----------------------------------------------------------------


static void addFloatToBuffer( float _value, unsigned char *&_buffer )
{
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    // get pointer
    unsigned char *v = (unsigned char *) &_value;

    // copy over 4 bytes
    *_buffer++ = *v++;
    *_buffer++ = *v++;
    *_buffer++ = *v++;
    *_buffer++ = *v;
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}


//----------------------------------------------------------------


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static void addUCharToBuffer( unsigned char _value, unsigned char *&_buffer )
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{
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    // get pointer
    unsigned char *v = (unsigned char *) &_value;

    // copy over 1 byte
    *_buffer++ = *v;
}


//----------------------------------------------------------------


void SplatCloudNode::rebuildVBOPoints()
{
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	if( vboPointsOffset_ == -1 || !splatCloud_.hasPoints() )
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		return;

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#	ifdef REPORT_VBO_UPDATES
	std::cout << "SplatCloudNode::rebuildVBOPoints()" << std::endl;
#	endif
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	// get pointer to buffer
	unsigned char *buffer = vboData_ + vboPointsOffset_;
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	// for all points...
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	unsigned int i, num = splatCloud_.numPoints();
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	for( i=0; i<num; ++i )
	{
		// add point
		const Point &p = getPoint( i );
		addFloatToBuffer( p[0], buffer );
		addFloatToBuffer( p[1], buffer );
		addFloatToBuffer( p[2], buffer );
	}
}
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//----------------------------------------------------------------
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void SplatCloudNode::rebuildVBONormals()
{
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	if( vboNormalsOffset_ == -1 || !splatCloud_.hasNormals()  )
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		return;
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#	ifdef REPORT_VBO_UPDATES
	std::cout << "SplatCloudNode::rebuildVBONormals()" << std::endl;
#	endif
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	// get pointer to buffer
	unsigned char *buffer = vboData_ + vboNormalsOffset_;

	// for all points...
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	unsigned int i, num = splatCloud_.numPoints();
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	for( i=0; i<num; ++i )
	{
		// add normal
		const Normal &n = getNormal( i );
		addFloatToBuffer( n[0], buffer );
		addFloatToBuffer( n[1], buffer );
		addFloatToBuffer( n[2], buffer );
	}
}


//----------------------------------------------------------------


void SplatCloudNode::rebuildVBOPointsizes()
{
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	if( vboPointsizesOffset_ == -1 || !splatCloud_.hasPointsizes()  )
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		return;
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#	ifdef REPORT_VBO_UPDATES
	std::cout << "SplatCloudNode::rebuildVBOPointsizes()" << std::endl;
#	endif

	// get pointer to buffer
	unsigned char *buffer = vboData_ + vboPointsizesOffset_;

	// for all points...
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	unsigned int i, num = splatCloud_.numPoints();
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	for( i=0; i<num; ++i )
	{
		// add pointsize
		const Pointsize &ps = getPointsize( i );
		addFloatToBuffer( ps, buffer );
	}
}


//----------------------------------------------------------------


void SplatCloudNode::rebuildVBOColors()
{
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	if( vboColorsOffset_ == -1 || !splatCloud_.hasColors()  )
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		return;

#	ifdef REPORT_VBO_UPDATES
	std::cout << "SplatCloudNode::rebuildVBOColors()" << std::endl;
#	endif

	// get pointer to buffer
	unsigned char *buffer = vboData_ + vboColorsOffset_;

	// for all points...
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	unsigned int i, num = splatCloud_.numPoints();
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	for( i=0; i<num; ++i )
	{
		// add color
		const Color &c = getColor( i );
		addUCharToBuffer( c[0], buffer );
		addUCharToBuffer( c[1], buffer );
		addUCharToBuffer( c[2], buffer );
	}
}


//----------------------------------------------------------------


void SplatCloudNode::rebuildVBOSelections()
{
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	if( vboSelectionsOffset_ == -1 || !splatCloud_.hasSelections()  )
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		return;

#	ifdef REPORT_VBO_UPDATES
	std::cout << "SplatCloudNode::rebuildVBOSelections()" << std::endl;
#	endif

	// get pointer to buffer
	unsigned char *buffer = vboData_ + vboSelectionsOffset_;

	// for all points...
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	unsigned int i, num = splatCloud_.numPoints();
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	for( i=0; i<num; ++i )
	{
		const bool &s = getSelection( i );
		addFloatToBuffer( (s ? 1.0f : 0.0f), buffer );
	}
}


//----------------------------------------------------------------


void SplatCloudNode::rebuildVBOPickColors( GLState &_state )
{
	if( vboPickColorsOffset_ == -1 )
		return;

#	ifdef REPORT_VBO_UPDATES
	std::cout << "SplatCloudNode::rebuildVBOPickColors()" << std::endl;
#	endif

	// get pointer to buffer
	unsigned char *buffer = vboData_ + vboPickColorsOffset_;

	// for all points...
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	unsigned int i, num = splatCloud_.numPoints();
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	for( i=0; i<num; ++i )
	{
		// add pick color
		const Vec4uc &pc = _state.pick_get_name_color( i );
		addUCharToBuffer( pc[0], buffer );
		addUCharToBuffer( pc[1], buffer );
		addUCharToBuffer( pc[2], buffer );
		addUCharToBuffer( pc[3], buffer );
	}
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}


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//================================================================


} // namespace SceneGraph
} // namespace ACG