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TEveBoxSetGL.cxx
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TEveBoxSetGL.cxx
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// @(#)root/eve:$Id$
// Authors: Matevz Tadel & Alja Mrak-Tadel: 2006, 2007
/*************************************************************************
* Copyright (C) 1995-2007, Rene Brun and Fons Rademakers. *
* All rights reserved. *
* *
* For the licensing terms see $ROOTSYS/LICENSE. *
* For the list of contributors see $ROOTSYS/README/CREDITS. *
*************************************************************************/
#include "TEveBoxSetGL.h"
#include "TEveBoxSet.h"
#include "TGLIncludes.h"
#include "TGLRnrCtx.h"
#include "TGLSelectRecord.h"
#include "TGLQuadric.h"
/** \class TEveBoxSetGL
\ingroup TEve
A GL rendering class for TEveBoxSet.
*/
ClassImp(TEveBoxSetGL);
////////////////////////////////////////////////////////////////////////////////
/// Default constructor.
TEveBoxSetGL::TEveBoxSetGL() : TEveDigitSetGL(), fM(0), fBoxDL(0)
{
fDLCache = kFALSE; // Disable display list, used internally for boxes, cones.
fMultiColor = kTRUE;
}
////////////////////////////////////////////////////////////////////////////////
/// Destructor.
TEveBoxSetGL::~TEveBoxSetGL()
{
DLCachePurge();
}
////////////////////////////////////////////////////////////////////////////////
/// Return GL primitive used to render the boxes, based on the
/// render-mode specified in the model object.
Int_t TEveBoxSetGL::PrimitiveType() const
{
return (fM->fRenderMode != TEveDigitSet::kRM_Line) ? GL_QUADS : GL_LINE_LOOP;
}
////////////////////////////////////////////////////////////////////////////////
/// Fill array p to represent a box (0,0,0) - (dx,dy,dz).
void TEveBoxSetGL::MakeOriginBox(Float_t p[8][3], Float_t dx, Float_t dy, Float_t dz) const
{
// bottom
p[0][0] = 0; p[0][1] = dy; p[0][2] = 0;
p[1][0] = dx; p[1][1] = dy; p[1][2] = 0;
p[2][0] = dx; p[2][1] = 0; p[2][2] = 0;
p[3][0] = 0; p[3][1] = 0; p[3][2] = 0;
// top
p[4][0] = 0; p[4][1] = dy; p[4][2] = dz;
p[5][0] = dx; p[5][1] = dy; p[5][2] = dz;
p[6][0] = dx; p[6][1] = 0; p[6][2] = dz;
p[7][0] = 0; p[7][1] = 0; p[7][2] = dz;
}
////////////////////////////////////////////////////////////////////////////////
/// Render a box specified by points in array p with standard
/// axis-aligned normals.
inline void TEveBoxSetGL::RenderBoxStdNorm(const Float_t p[8][3]) const
{
// bottom: 0123
glNormal3f(0, 0, -1);
glVertex3fv(p[0]); glVertex3fv(p[1]);
glVertex3fv(p[2]); glVertex3fv(p[3]);
// top: 7654
glNormal3f(0, 0, 1);
glVertex3fv(p[7]); glVertex3fv(p[6]);
glVertex3fv(p[5]); glVertex3fv(p[4]);
// back: 0451
glNormal3f(0, 1, 0);
glVertex3fv(p[0]); glVertex3fv(p[4]);
glVertex3fv(p[5]); glVertex3fv(p[1]);
// front: 3267
glNormal3f(0, -1, 0);
glVertex3fv(p[3]); glVertex3fv(p[2]);
glVertex3fv(p[6]); glVertex3fv(p[7]);
// left: 0374
glNormal3f(-1, 0, 0);
glVertex3fv(p[0]); glVertex3fv(p[3]);
glVertex3fv(p[7]); glVertex3fv(p[4]);
// right: 1562
glNormal3f(1, 0, 0);
glVertex3fv(p[1]); glVertex3fv(p[5]);
glVertex3fv(p[6]); glVertex3fv(p[2]);
}
namespace
{
void subtract_and_normalize(const Float_t a[3], const Float_t b[3],
Float_t o[3])
{
// Calculate a - b and normalize the result.
o[0] = a[0] - b[0];
o[1] = a[1] - b[1];
o[2] = a[2] - b[2];
Float_t d = sqrtf(o[0]*o[0] + o[1]*o[1] + o[2]*o[2]);
if (d != 0)
{
d = 1.0f / d;
o[0] *= d;
o[1] *= d;
o[2] *= d;
}
}
}
////////////////////////////////////////////////////////////////////////////////
/// Render box, calculate normals on the fly from first three points.
void TEveBoxSetGL::RenderBoxAutoNorm(const Float_t p[8][3]) const
{
Float_t e[6][3], n[3];
subtract_and_normalize(p[1], p[0], e[0]);
subtract_and_normalize(p[3], p[0], e[1]);
subtract_and_normalize(p[4], p[0], e[2]);
subtract_and_normalize(p[5], p[6], e[3]);
subtract_and_normalize(p[7], p[6], e[4]);
subtract_and_normalize(p[2], p[6], e[5]);
// bottom: 0123
glNormal3fv(TMath::Cross(e[0], e[1], n));
glVertex3fv(p[0]); glVertex3fv(p[1]);
glVertex3fv(p[2]); glVertex3fv(p[3]);
// top: 7654
glNormal3fv(TMath::Cross(e[3], e[4], n));
glVertex3fv(p[7]); glVertex3fv(p[6]);
glVertex3fv(p[5]); glVertex3fv(p[4]);
// back: 0451
glNormal3fv(TMath::Cross(e[2], e[0], n));
glVertex3fv(p[0]); glVertex3fv(p[4]);
glVertex3fv(p[5]); glVertex3fv(p[1]);
// front: 3267
glNormal3fv(TMath::Cross(e[4], e[5], n));
glVertex3fv(p[3]); glVertex3fv(p[2]);
glVertex3fv(p[6]); glVertex3fv(p[7]);
// left: 0374
glNormal3fv(TMath::Cross(e[1], e[2], n));
glVertex3fv(p[0]); glVertex3fv(p[3]);
glVertex3fv(p[7]); glVertex3fv(p[4]);
// right: 1562
glNormal3fv(TMath::Cross(e[5], e[3], n));
glVertex3fv(p[1]); glVertex3fv(p[5]);
glVertex3fv(p[6]); glVertex3fv(p[2]);
}
////////////////////////////////////////////////////////////////////////////////
/// Create a display-list for rendering a single box, based on the
/// current box-type.
/// Some box-types don't benefit from the display-list rendering and
/// so display-list is not created.
void TEveBoxSetGL::MakeDisplayList() const
{
if (fM->fBoxType == TEveBoxSet::kBT_AABox ||
fM->fBoxType == TEveBoxSet::kBT_AABoxFixedDim ||
fM->fBoxType == TEveBoxSet::kBT_Cone ||
fM->fBoxType == TEveBoxSet::kBT_EllipticCone)
{
if (fBoxDL == 0)
fBoxDL = glGenLists(1);
glNewList(fBoxDL, GL_COMPILE);
if (fM->fBoxType < TEveBoxSet::kBT_Cone)
{
glBegin(PrimitiveType());
Float_t p[8][3];
if (fM->fBoxType == TEveBoxSet::kBT_AABox)
MakeOriginBox(p, 1.0f, 1.0f, 1.0f);
else
MakeOriginBox(p, fM->fDefWidth, fM->fDefHeight, fM->fDefDepth);
RenderBoxStdNorm(p);
glEnd();
}
else
{
static TGLQuadric quad;
Int_t nt = 15; // number of corners
gluCylinder(quad.Get(), 0, 1, 1, nt, 1);
if (fM->fDrawConeCap)
{
glPushMatrix();
glTranslatef(0, 0, 1);
gluDisk(quad.Get(), 0, 1, nt, 1);
glPopMatrix();
}
}
glEndList();
}
}
////////////////////////////////////////////////////////////////////////////////
/// Determines if display-list will be used for rendering.
/// Virtual from TGLLogicalShape.
Bool_t TEveBoxSetGL::ShouldDLCache(const TGLRnrCtx& rnrCtx) const
{
MakeDisplayList();
return TEveDigitSetGL::ShouldDLCache(rnrCtx);
}
////////////////////////////////////////////////////////////////////////////////
/// Called when display lists have been destroyed externally and the
/// internal display-list data needs to be cleare.
/// Virtual from TGLLogicalShape.
void TEveBoxSetGL::DLCacheDrop()
{
fBoxDL = 0;
TGLObject::DLCacheDrop();
}
////////////////////////////////////////////////////////////////////////////////
/// Called when display-lists need to be returned to the system.
/// Virtual from TGLLogicalShape.
void TEveBoxSetGL::DLCachePurge()
{
if (fBoxDL != 0)
{
PurgeDLRange(fBoxDL, 1);
fBoxDL = 0;
}
TGLObject::DLCachePurge();
}
////////////////////////////////////////////////////////////////////////////////
/// Set model object.
/// Virtual from TGLObject.
Bool_t TEveBoxSetGL::SetModel(TObject* obj, const Option_t* /*opt*/)
{
fM = SetModelDynCast<TEveBoxSet>(obj);
return kTRUE;
}
namespace
{
inline void AntiFlick(Float_t x, Float_t y, Float_t z)
{
// Render anti-flickering point.
glBegin(GL_POINTS);
glVertex3f(x, y, z);
glEnd();
}
}
////////////////////////////////////////////////////////////////////////////////
/// GL rendering for all box-types.
void TEveBoxSetGL::RenderBoxes(TGLRnrCtx& rnrCtx) const
{
static const TEveException eH("TEveBoxSetGL::RenderBoxes ");
if (rnrCtx.SecSelection()) glPushName(0);
Int_t boxSkip = 0;
if (fM->fBoxSkip > 0 && rnrCtx.CombiLOD() < TGLRnrCtx::kLODHigh &&
!rnrCtx.SecSelection())
{
boxSkip = TMath::Nint(TMath::Power(fM->fBoxSkip, 2.0 - 0.02*rnrCtx.CombiLOD()));
}
TEveChunkManager::iterator bi(fM->fPlex);
if (rnrCtx.Highlight() && fHighlightSet)
bi.fSelection = fHighlightSet;
switch (fM->fBoxType)
{
case TEveBoxSet::kBT_FreeBox:
{
GLenum primitiveType = PrimitiveType();
while (bi.next())
{
TEveBoxSet::BFreeBox_t& b = * (TEveBoxSet::BFreeBox_t*) bi();
if (SetupColor(b))
{
if (rnrCtx.SecSelection()) glLoadName(bi.index());
glBegin(primitiveType);
RenderBoxAutoNorm(b.fVertices);
glEnd();
if (fM->fAntiFlick)
AntiFlick(0.5f*(b.fVertices[0][0] + b.fVertices[6][0]),
0.5f*(b.fVertices[0][1] + b.fVertices[6][1]),
0.5f*(b.fVertices[0][2] + b.fVertices[6][2]));
}
if (boxSkip) { Int_t s = boxSkip; while (s--) bi.next(); }
}
break;
} // end case free-box
case TEveBoxSet::kBT_AABox:
{
glEnable(GL_NORMALIZE);
while (bi.next())
{
TEveBoxSet::BAABox_t& b = * (TEveBoxSet::BAABox_t*) bi();
if (SetupColor(b))
{
if (rnrCtx.SecSelection()) glLoadName(bi.index());
glPushMatrix();
glTranslatef(b.fA, b.fB, b.fC);
glScalef (b.fW, b.fH, b.fD);
glCallList(fBoxDL);
if (fM->fAntiFlick)
AntiFlick(0.5f, 0.5f, 0.5f);
glPopMatrix();
}
if (boxSkip) { Int_t s = boxSkip; while (s--) bi.next(); }
}
break;
}
case TEveBoxSet::kBT_AABoxFixedDim:
{
while (bi.next())
{
TEveBoxSet::BAABoxFixedDim_t& b = * (TEveBoxSet::BAABoxFixedDim_t*) bi();
if (SetupColor(b))
{
if (rnrCtx.SecSelection()) glLoadName(bi.index());
glTranslatef(b.fA, b.fB, b.fC);
glCallList(fBoxDL);
if (fM->fAntiFlick)
AntiFlick(0.5f*fM->fDefWidth, 0.5f*fM->fDefHeight, 0.5f*fM->fDefDepth);
glTranslatef(-b.fA, -b.fB, -b.fC);
}
if (boxSkip) { Int_t s = boxSkip; while (s--) bi.next(); }
}
break;
}
case TEveBoxSet::kBT_Cone:
{
using namespace TMath;
glEnable(GL_NORMALIZE);
Float_t theta=0, phi=0, h=0;
while (bi.next())
{
TEveBoxSet::BCone_t& b = * (TEveBoxSet::BCone_t*) bi();
if (SetupColor(b))
{
if (rnrCtx.SecSelection()) glLoadName(bi.index());
h = b.fDir.Mag();
phi = ATan2(b.fDir.fY, b.fDir.fX)*RadToDeg();
theta = ATan (b.fDir.fZ / Sqrt(b.fDir.fX*b.fDir.fX + b.fDir.fY*b.fDir.fY))*RadToDeg();
glPushMatrix();
glTranslatef(b.fPos.fX, b.fPos.fY, b.fPos.fZ);
glRotatef(phi, 0, 0, 1);
glRotatef(90 - theta, 0, 1, 0);
glScalef (b.fR, b.fR, h);
glCallList(fBoxDL);
if (fM->fAntiFlick)
AntiFlick(0.0f, 0.0f, 0.5f);
glPopMatrix();
}
if (boxSkip) { Int_t s = boxSkip; while (s--) bi.next(); }
}
break;
}
case TEveBoxSet::kBT_EllipticCone:
{
using namespace TMath;
glEnable(GL_NORMALIZE);
Float_t theta=0, phi=0, h=0;
while (bi.next())
{
TEveBoxSet::BEllipticCone_t& b = * (TEveBoxSet::BEllipticCone_t*) bi();
if (SetupColor(b))
{
if (rnrCtx.SecSelection()) glLoadName(bi.index());
h = b.fDir.Mag();
phi = ATan2(b.fDir.fY, b.fDir.fX)*RadToDeg();
theta = ATan (b.fDir.fZ / Sqrt(b.fDir.fX*b.fDir.fX + b.fDir.fY*b.fDir.fY))*RadToDeg();
glPushMatrix();
glTranslatef(b.fPos.fX, b.fPos.fY, b.fPos.fZ);
glRotatef(phi, 0, 0, 1);
glRotatef(90 - theta, 0, 1, 0);
glRotatef(b.fAngle, 0, 0, 1);
glScalef (b.fR, b.fR2, h);
glCallList(fBoxDL);
if (fM->fAntiFlick)
AntiFlick(0.0f, 0.0f, 0.5f);
glPopMatrix();
}
if (boxSkip) { Int_t s = boxSkip; while (s--) bi.next(); }
}
break;
}
default:
{
throw(eH + "unsupported box-type.");
}
} // end switch box-type
if (rnrCtx.SecSelection()) glPopName();
}
////////////////////////////////////////////////////////////////////////////////
/// Actual rendering code.
/// Virtual from TGLLogicalShape.
void TEveBoxSetGL::DirectDraw(TGLRnrCtx& rnrCtx) const
{
TEveBoxSet& mB = * fM;
// printf("TEveBoxSetGL::DirectDraw N boxes %d\n", mB.fPlex.Size());
if (mB.fPlex.Size() > 0)
{
if (! mB.fSingleColor && ! mB.fValueIsColor && mB.fPalette == 0)
{
mB.AssertPalette();
}
glPushAttrib(GL_ENABLE_BIT | GL_POLYGON_BIT);
if ( ! rnrCtx.IsDrawPassOutlineLine())
{
if (mB.fRenderMode == TEveDigitSet::kRM_Fill)
glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
else if (mB.fRenderMode == TEveDigitSet::kRM_Line)
glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
}
if (mB.fBoxType == TEveBoxSet::kBT_Cone ||
mB.fBoxType == TEveBoxSet::kBT_EllipticCone)
{
glDisable(GL_CULL_FACE);
}
if (mB.fDisableLighting) glDisable(GL_LIGHTING);
RenderBoxes(rnrCtx);
glPopAttrib();
}
DrawFrameIfNeeded(rnrCtx);
}
////////////////////////////////////////////////////////////////////////////////
/// Interface for direct rendering from classes that include TEveBoxSet
/// as a member.
void TEveBoxSetGL::Render(TGLRnrCtx& rnrCtx)
{
MakeDisplayList();
DirectDraw(rnrCtx);
glDeleteLists(fBoxDL, 1);
fBoxDL = 0;
}