roundedboxgenerator.cpp

// © Copyright 2010 - 2016 BlackTopp Studios Inc.
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/*
 -----------------------------------------------------------------------------
 This source file is part of ogre-procedural

 For the latest info, see http://code.google.com/p/ogre-procedural/

 Copyright (c) 2010-2013 Michael Broutin

 Permission is hereby granted, free of charge, to any person obtaining a copy
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 */
#ifndef _graphicsproceduralroundedboxgenerator_cpp
#define _graphicsproceduralroundedboxgenerator_cpp

#include "Graphics/Procedural/Mesh/roundedboxgenerator.h"
#include "Graphics/Procedural/Mesh/planegenerator.h"

#include "MathTools/mathtools.h"
#include "exception.h"

namespace Mezzanine
{
    namespace Graphics
    {
        namespace Procedural
        {
            RoundedBoxGenerator::RoundedBoxGenerator(const Vector3& Size, const Real ChamferSize, const Whole SegX, const Whole SegY, const Whole SegZ, const Whole ChamferSeg)
            {
                this->SetSize(Size);
                this->SetChamferSize(ChamferSize);
                this->SetNumSegX(SegX);
                this->SetNumSegY(SegY);
                this->SetNumSegZ(SegZ);
                this->SetNumChamferSeg(ChamferSeg);
            }

            RoundedBoxGenerator::RoundedBoxGenerator(const Real SizeX, const Real SizeY, const Real SizeZ, const Real ChamferSize, const Whole SegX, const Whole SegY, const Whole SegZ, const Whole ChamferSeg)
            {
                this->SetSizeX(SizeX);
                this->SetSizeY(SizeY);
                this->SetSizeZ(SizeZ);
                this->SetChamferSize(ChamferSize);
                this->SetNumSegX(SegX);
                this->SetNumSegY(SegY);
                this->SetNumSegZ(SegZ);
                this->SetNumChamferSeg(ChamferSeg);
            }

            RoundedBoxGenerator::~RoundedBoxGenerator()
                {  }

            void RoundedBoxGenerator::_AddEdge(TriangleBuffer& Buffer, Int16 XPos, Int16 YPos, Int16 ZPos) const
            {
                Integer Offset = 0;

                Vector3 centerPosition = ( Vector3::Unit_X() * ( 0.5 * XPos * this->BoxSize.X ) ) + ( Vector3::Unit_Y() * ( 0.5 * YPos * this->BoxSize.Y ) ) + ( Vector3::Unit_Z() * ( 0.5 * ZPos * this->BoxSize.Z ) );
                Vector3 vy0 =  Vector3::Unit_X() * ( 1.f - MathTools::Abs(XPos) ) + Vector3::Unit_Y() * ( 1.f - MathTools::Abs(YPos) ) + Vector3::Unit_Z() * ( 1.f - MathTools::Abs(ZPos) );//extrusion direction

                Vector3 vx0 = vy0.GetAntiPermute();
                Vector3 vz0 = vy0.GetPermute();
                if( vx0.DotProduct(centerPosition) < 0.0 )
                    vx0 = -vx0;
                if( vz0.DotProduct(centerPosition) < 0.0 )
                    vz0 = -vz0;
                if( vx0.CrossProduct(vy0).DotProduct(vz0) < 0.0 )
                    vy0 = -vy0;

                Real height = ( 1 - MathTools::Abs(XPos) ) * this->BoxSize.X + ( 1 - MathTools::Abs(YPos) ) * this->BoxSize.Y + ( 1 - MathTools::Abs(ZPos) ) * this->BoxSize.Z;
                Vector3 OffsetPosition = centerPosition - ( vy0 * ( 0.5 * height ) );
                Integer numSegHeight = 1;

                if( XPos == 0 )
                    numSegHeight = this->NumSegX;
                else if( YPos == 0 )
                    numSegHeight = this->NumSegY;
                else if( ZPos == 0 )
                    numSegHeight = this->NumSegZ;

                Real deltaAngle = ( MathTools::GetHalfPi() / this->NumChamferSeg );
                Real deltaHeight = height / (Real)numSegHeight;


                Buffer.RebaseOffset();
                Buffer.EstimateIndexCount( 6 * numSegHeight * this->NumChamferSeg );
                Buffer.EstimateVertexCount( ( numSegHeight + 1 ) * ( this->NumChamferSeg + 1 ) );

                for( Integer i = 0 ; i <= numSegHeight ; i++ )
                {
                    for( Whole j = 0 ; j <= this->NumChamferSeg ; j++ )
                    {
                        Real x0 = this->BoxChamferSize * cosf( j * deltaAngle );
                        Real z0 = this->BoxChamferSize * sinf( j * deltaAngle );
                        this->AddPoint( Buffer, Vector3( ( vx0 * x0 ) + ( vy0 * ( i * deltaHeight ) ) + ( vz0 * z0 ) + OffsetPosition ),
                                        ( vx0 * x0 + vz0 * z0 ).GetNormal(),
                                        Vector2( j / (Real)this->NumChamferSeg, i / (Real)numSegHeight ) );

                        if( i != numSegHeight && j != this->NumChamferSeg ) {
                            Buffer.AddIndex( Offset + this->NumChamferSeg + 2 );
                            Buffer.AddIndex( Offset );
                            Buffer.AddIndex( Offset + this->NumChamferSeg + 1 );
                            Buffer.AddIndex( Offset + this->NumChamferSeg + 2 );
                            Buffer.AddIndex( Offset + 1 );
                            Buffer.AddIndex( Offset );
                        }
                        Offset ++;
                    }
                }
            }

            void RoundedBoxGenerator::_AddCorner(TriangleBuffer& Buffer, Boole IsXPositive, Boole IsYPositive, Boole IsZPositive) const
            {
                Buffer.RebaseOffset();
                Buffer.EstimateVertexCount( ( this->NumChamferSeg + 1) * ( this->NumChamferSeg + 1 ) );
                Buffer.EstimateIndexCount( this->NumChamferSeg * this->NumChamferSeg * 6 );
                Integer Offset = 0;

                Vector3 OffsetPosition( ( IsXPositive ? 1 : -1 ) * .5f * this->BoxSize.X, ( IsYPositive ? 1 : -1 ) * .5f * this->BoxSize.Y, ( IsZPositive ? 1 : -1 ) * .5f * this->BoxSize.Z );
                Real deltaRingAngle = ( MathTools::GetHalfPi() / this->NumChamferSeg );
                Real deltaSegAngle = ( MathTools::GetHalfPi() / this->NumChamferSeg );
                Real OffsetRingAngle = IsYPositive ? 0 : MathTools::GetHalfPi();
                Real OffsetSegAngle;
                if ( IsXPositive && IsZPositive )
                    OffsetSegAngle = 0;
                if ( ( !IsXPositive ) && IsZPositive )
                    OffsetSegAngle = 1.5f * MathTools::GetPi();
                if ( IsXPositive && ( !IsZPositive ) )
                    OffsetSegAngle = MathTools::GetHalfPi();
                if ( ( !IsXPositive ) && ( !IsZPositive ) )
                    OffsetSegAngle = MathTools::GetPi();

                // Generate the group of rings for the sphere
                for( Whole ring = 0 ; ring <= this->NumChamferSeg ; ring++ )
                {
                    Real r0 = this->BoxChamferSize * sinf( ring * deltaRingAngle + OffsetRingAngle );
                    Real y0 = this->BoxChamferSize * cosf( ring * deltaRingAngle + OffsetRingAngle );

                    // Generate the group of segments for the current ring
                    for( Whole seg = 0 ; seg <= this->NumChamferSeg ; seg++ )
                    {
                        Real x0 = r0 * sinf( seg * deltaSegAngle + OffsetSegAngle );
                        Real z0 = r0 * cosf( seg * deltaSegAngle + OffsetSegAngle );

                        // Add one vertex to the strip which makes up the sphere
                        this->AddPoint( Buffer, Vector3( x0 + OffsetPosition.X, y0 + OffsetPosition.Y, z0 + OffsetPosition.Z ),
                                        Vector3( x0, y0, z0 ).GetNormal(),
                                        Vector2( (Real)seg / (Real)this->NumChamferSeg, (Real) ring / (Real)this->NumChamferSeg ) );

                        if( ( ring != this->NumChamferSeg ) && ( seg != this->NumChamferSeg ) ) {
                            // each vertex (except the last) has six indices pointing to it
                            Buffer.AddIndex( Offset + this->NumChamferSeg + 2 );
                            Buffer.AddIndex( Offset );
                            Buffer.AddIndex( Offset + this->NumChamferSeg + 1 );
                            Buffer.AddIndex( Offset + this->NumChamferSeg + 2 );
                            Buffer.AddIndex( Offset + 1 );
                            Buffer.AddIndex( Offset );
                        }

                        Offset++;
                    }//for each segment
                }//for each ring
            }

            ///////////////////////////////////////////////////////////////////////////////
            // Utility

            void RoundedBoxGenerator::AddToTriangleBuffer(TriangleBuffer& Buffer) const
            {
                // Generate the pseudo-box shape
                PlaneGenerator PG;
                PG.SetUTile(this->UTile).SetVTile(this->VTile);
                if( this->GeneratorOpts | GO_Transform ) {
                    PG.SetScale(this->Scale);
                    PG.SetOrientation(this->Orientation);
                }

                PG.SetNumSegX( this->NumSegY ).SetNumSegY( this->NumSegX ).SetSizeX( this->BoxSize.Y ).SetSizeY( this->BoxSize.X )
                .SetNormal( Vector3::Neg_Unit_Z() )
                .SetPosition( ( this->Orientation * Vector3::Neg_Unit_Z() ) * ( 0.5 * this->BoxSize.Z + this->BoxChamferSize ) )
                .AddToTriangleBuffer( Buffer );
                Buffer.RebaseOffset();
                PG.SetNumSegX( this->NumSegY ).SetNumSegY( this->NumSegX ).SetSizeX( this->BoxSize.Y ).SetSizeY( this->BoxSize.X )
                .SetNormal( Vector3::Unit_Z() )
                .SetPosition( ( this->Orientation * Vector3::Unit_Z() ) * ( 0.5 * this->BoxSize.Z + this->BoxChamferSize ) )
                .AddToTriangleBuffer( Buffer );
                Buffer.RebaseOffset();
                PG.SetNumSegX( this->NumSegZ ).SetNumSegY( this->NumSegX ).SetSizeX( this->BoxSize.Z ).SetSizeY( this->BoxSize.X )
                .SetNormal( Vector3::Neg_Unit_Y() )
                .SetPosition( ( this->Orientation * Vector3::Neg_Unit_Y() ) * ( 0.5 * this->BoxSize.Y + this->BoxChamferSize ) )
                .AddToTriangleBuffer( Buffer );
                Buffer.RebaseOffset();
                PG.SetNumSegX( this->NumSegZ ).SetNumSegY( this->NumSegX ).SetSizeX( this->BoxSize.Z ).SetSizeY( this->BoxSize.X )
                .SetNormal( Vector3::Unit_Y() )
                .SetPosition( ( this->Orientation * Vector3::Unit_Y() ) * ( 0.5 * this->BoxSize.Y + this->BoxChamferSize ) )
                .AddToTriangleBuffer( Buffer );
                Buffer.RebaseOffset();
                PG.SetNumSegX( this->NumSegZ ).SetNumSegY( this->NumSegY ).SetSizeX( this->BoxSize.Z ).SetSizeY( this->BoxSize.Y )
                .SetNormal( Vector3::Neg_Unit_X() )
                .SetPosition( ( this->Orientation * Vector3::Neg_Unit_X() ) * ( 0.5 * this->BoxSize.X + this->BoxChamferSize ) )
                .AddToTriangleBuffer( Buffer );
                Buffer.RebaseOffset();
                PG.SetNumSegX( this->NumSegZ ).SetNumSegY( this->NumSegY ).SetSizeX( this->BoxSize.Z ).SetSizeY( this->BoxSize.Y )
                .SetNormal( Vector3::Unit_X() )
                .SetPosition( ( this->Orientation * Vector3::Unit_X() ) * ( 0.5 * this->BoxSize.X + this->BoxChamferSize ) )
                .AddToTriangleBuffer( Buffer );

                // Generate the corners
                this->_AddCorner( Buffer, true,  true,  true );
                this->_AddCorner( Buffer, true,  true,  false );
                this->_AddCorner( Buffer, true,  false, true );
                this->_AddCorner( Buffer, true,  false, false );
                this->_AddCorner( Buffer, false, true,  true );
                this->_AddCorner( Buffer, false, true,  false );
                this->_AddCorner( Buffer, false, false, true );
                this->_AddCorner( Buffer, false, false, false );

                // Generate the edges
                this->_AddEdge( Buffer, -1,-1, 0 );
                this->_AddEdge( Buffer, -1, 1, 0 );
                this->_AddEdge( Buffer,  1,-1, 0 );
                this->_AddEdge( Buffer,  1, 1, 0 );
                this->_AddEdge( Buffer, -1, 0,-1 );
                this->_AddEdge( Buffer, -1, 0, 1 );
                this->_AddEdge( Buffer,  1, 0,-1 );
                this->_AddEdge( Buffer,  1, 0, 1 );
                this->_AddEdge( Buffer,  0,-1,-1 );
                this->_AddEdge( Buffer,  0,-1, 1 );
                this->_AddEdge( Buffer,  0, 1,-1 );
                this->_AddEdge( Buffer,  0, 1, 1 );
            }

            ///////////////////////////////////////////////////////////////////////////////
            // Configuration

            RoundedBoxGenerator& RoundedBoxGenerator::SetSizeX(const Real SizeX)
            {
                if( SizeX <= 0.0 )
                    MEZZ_EXCEPTION(ExceptionBase::PARAMETERS_EXCEPTION,"Size on an axis for a generated box mesh must be greater than zero.");

                this->BoxSize.X = SizeX;
                return *this;
            }

            RoundedBoxGenerator& RoundedBoxGenerator::SetSizeY(const Real SizeY)
            {
                if( SizeY <= 0.0 )
                    MEZZ_EXCEPTION(ExceptionBase::PARAMETERS_EXCEPTION,"Size on an axis for a generated box mesh must be greater than zero.");

                this->BoxSize.Y = SizeY;
                return *this;
            }

            RoundedBoxGenerator& RoundedBoxGenerator::SetSizeZ(const Real SizeZ)
            {
                if( SizeZ <= 0.0 )
                    MEZZ_EXCEPTION(ExceptionBase::PARAMETERS_EXCEPTION,"Size on an axis for a generated rounded box mesh must be greater than zero.");

                this->BoxSize.Z = SizeZ;
                return *this;
            }

            RoundedBoxGenerator& RoundedBoxGenerator::SetSize(const Vector3& Size)
            {
                this->SetSizeX(Size.X);
                this->SetSizeY(Size.Y);
                this->SetSizeZ(Size.Z);
                return *this;
            }

            RoundedBoxGenerator& RoundedBoxGenerator::SetChamferSize(const Real ChamferSize)
            {
                if( ChamferSize <= 0.0 )
                    MEZZ_EXCEPTION(ExceptionBase::PARAMETERS_EXCEPTION,"Size for radius of rounded edge on a generated rounded box mesh must be greater than zero.");

                this->BoxChamferSize = ChamferSize;
                return *this;
            }

            RoundedBoxGenerator& RoundedBoxGenerator::SetNumSegX(const Whole SegX)
            {
                if( SegX == 0 )
                    MEZZ_EXCEPTION(ExceptionBase::PARAMETERS_EXCEPTION,"Number of segments for generated rounded box mesh must be greater than zero.");

                this->NumSegX = SegX;
                return *this;
            }

            RoundedBoxGenerator& RoundedBoxGenerator::SetNumSegY(const Whole SegY)
            {
                if( SegY == 0 )
                    MEZZ_EXCEPTION(ExceptionBase::PARAMETERS_EXCEPTION,"Number of segments for generated rounded box mesh must be greater than zero.");

                this->NumSegY = SegY;
                return *this;
            }

            RoundedBoxGenerator& RoundedBoxGenerator::SetNumSegZ(const Whole SegZ)
            {
                if( SegZ == 0 )
                    MEZZ_EXCEPTION(ExceptionBase::PARAMETERS_EXCEPTION,"Number of segments for generated rounded box mesh must be greater than zero.");

                this->NumSegZ = SegZ;
                return *this;
            }

            RoundedBoxGenerator& RoundedBoxGenerator::SetNumChamferSeg(const Whole ChamferSeg)
            {
                if( ChamferSeg == 0 )
                    MEZZ_EXCEPTION(ExceptionBase::PARAMETERS_EXCEPTION,"Number of segments for generated rounded box mesh must be greater than zero.");

                this->NumChamferSeg = ChamferSeg;
                return *this;
            }
        }//Procedural
    }//Graphics
}//Mezzanine

#endif