source: GTP/trunk/Lib/Vis/Preprocessing/src/GlRenderer.cpp @ 1581

#include "Mesh.h"
#include "glInterface.h"
#include "OcclusionQuery.h"
#include "GlRenderer.h"
#include "ViewCellsManager.h"
#include "SceneGraph.h"
#include "Pvs.h"
#include "Viewcell.h"
#include "Beam.h"
#include "KdTree.h"
#include "Environment.h"
#include "Triangle3.h"
#include "IntersectableWrapper.h"

//#include <Cg/cg.h>
//#include <Cg/cgGL.h>


namespace GtpVisibilityPreprocessor {


static bool arbQuerySupport = false;
static bool nvQuerySupport = false;


static void InitExtensions() 
{
        GLenum err = glewInit();

        if (GLEW_OK != err) 
        {
                // problem: glewInit failed, something is seriously wrong
                cerr << "Error: " << glewGetErrorString(err) << endl;
                exit(1);
        }

        if (GLEW_ARB_occlusion_query) 
                arbQuerySupport = true;
        
        if (GLEW_NV_occlusion_query) 
                nvQuerySupport = true;
        

        if  (!arbQuerySupport && !nvQuerySupport)
        {
                cout << "I require the GL_ARB_occlusion_query or the GL_NV_occlusion_query OpenGL extension to work.\n";
                exit(1);
        }
}


GlRenderer::GlRenderer(SceneGraph *sceneGraph,
                                           ViewCellsManager *viewCellsManager,
                                           KdTree *tree):
  Renderer(sceneGraph, viewCellsManager),
  mKdTree(tree)
{
  mSceneGraph->CollectObjects(&mObjects);

  //  mViewCellsManager->GetViewPoint(mViewPoint);

  mViewPoint = mSceneGraph->GetBox().Center();
  mViewDirection = Vector3(0,0,1);

  //  mViewPoint = Vector3(991.7, 187.8, -271);
  //  mViewDirection = Vector3(0.9, 0, -0.4);

  //  timerId = startTimer(10);
  // debug coords for atlanta
  //  mViewPoint = Vector3(3473, 6.778, -1699);
  //  mViewDirection = Vector3(-0.2432, 0, 0.97);
  
  mFrame = 0;
  mWireFrame = false;
  Environment::GetSingleton()->GetBoolValue("Preprocessor.detectEmptyViewSpace", mDetectEmptyViewSpace);
  mSnapErrorFrames = true;
  mSnapPrefix = "snap/";
  mUseForcedColors = false;

  mUseGlLists = true;
  //mUseGlLists = false;
}

GlRenderer::~GlRenderer()
{
  cerr<<"gl renderer destructor..\n";
 
  //CLEAR_CONTAINER(sQueries);
  CLEAR_CONTAINER(mOcclusionQueries);

  cerr<<"done."<<endl;
}


void
GlRenderer::RenderTriangle(TriangleIntersectable *object)
{
  Triangle3 &t = object->GetItem();
  glBegin(GL_TRIANGLES);
  glVertex3f(t.mVertices[0].x, t.mVertices[0].y, t.mVertices[0].z);
  glVertex3f(t.mVertices[1].x, t.mVertices[1].y, t.mVertices[1].z);
  glVertex3f(t.mVertices[2].x, t.mVertices[2].y, t.mVertices[2].z);
  glEnd();
}

void
GlRenderer::RenderIntersectable(Intersectable *object)
{

  glPushAttrib(GL_CURRENT_BIT);
  if (mUseFalseColors)
        SetupFalseColor(object->mId);
  

  switch (object->Type()) {
  case Intersectable::MESH_INSTANCE:
        RenderMeshInstance((MeshInstance *)object);
        break;
  case Intersectable::VIEW_CELL:
        RenderViewCell(dynamic_cast<ViewCell *>(object));
        break;
  case Intersectable::TRANSFORMED_MESH_INSTANCE:
        RenderTransformedMeshInstance(dynamic_cast<TransformedMeshInstance *>(object));
        break;
  case Intersectable::TRIANGLE_INTERSECTABLE:
        RenderTriangle(dynamic_cast<TriangleIntersectable *>(object));
        break;
  default:
        cerr<<"Rendering this object not yet implemented\n";
        break;
  }

  glPopAttrib();
}

void
GlRenderer::RenderRays(const VssRayContainer &rays)
{
  VssRayContainer::const_iterator it = rays.begin(), it_end = rays.end();

  glBegin(GL_LINES);
  for (; it != it_end; ++it) {
        VssRay *ray = *it;
        float importance = log10(1e3*ray->mWeightedPvsContribution)/3.0f;
        //      cout<<"w="<<ray->mWeightedPvsContribution<<" r="<<ray->mWeightedPvsContribution;
        glColor3f(importance, importance, importance);
        glVertex3fv(&ray->mOrigin.x);
        glVertex3fv(&ray->mTermination.x);
  }
  glEnd();
}

void
GlRenderer::RenderViewCell(ViewCell *vc)
{
  if (vc->GetMesh()) {

        if (!mUseFalseColors) {
          if (vc->GetValid()) 
                glColor3f(0,1,0);
          else
                glColor3f(0,0,1);
        }
        
        RenderMesh(vc->GetMesh());
  } else {
        // render viewcells in the subtree
        if (!vc->IsLeaf()) {
          ViewCellInterior *vci = (ViewCellInterior *) vc;

          ViewCellContainer::iterator it = vci->mChildren.begin();
          for (; it != vci->mChildren.end(); ++it) {
                RenderViewCell(*it);
          }
        } else {
          //      cerr<<"Empty viewcell mesh\n";
        }
  }
}


void
GlRenderer::RenderMeshInstance(MeshInstance *mi)
{
  RenderMesh(mi->GetMesh());
}


void
GlRenderer::RenderTransformedMeshInstance(TransformedMeshInstance *mi)
{
        // apply world transform before rendering
        Matrix4x4 m;
        mi->GetWorldTransform(m);

        glPushMatrix();
/* cout << "\n";
        for (int i = 0; i < 4; ++ i)
                for (int j = 0; j < 4; ++ j)
                        cout << m.x[i][j] << " "; cout << "\n"*/

        glMultMatrixf((float *)m.x);

        /*GLfloat dummy[16];
        glGetFloatv(GL_MODELVIEW_MATRIX, dummy);
        for (int i = 0; i < 16; ++ i)
                cout << dummy[i] << " ";
        cout << endl;*/
        RenderMesh(mi->GetMesh());
        
        glPopMatrix();
}


void
GlRenderer::SetupFalseColor(const int id)
{
  // swap bits of the color
  glColor3ub(id&255, (id>>8)&255, (id>>16)&255);
}


int GlRenderer::GetId(int r, int g, int b) const
{
        return r + (g << 8) + (b << 16);
}

void
GlRenderer::SetupMaterial(Material *m)
{
  if (m)
        glColor3fv(&(m->mDiffuseColor.r));
}

void
GlRenderer::RenderMesh(Mesh *mesh)
{
  int i = 0;

  if (!mUseFalseColors && !mUseForcedColors)
        SetupMaterial(mesh->mMaterial);
  
  for (i=0; i < mesh->mFaces.size(); i++) {
        if (mWireFrame)
          glBegin(GL_LINE_LOOP);
        else
          glBegin(GL_POLYGON);

        Face *face = mesh->mFaces[i];
        for (int j = 0; j < face->mVertexIndices.size(); j++) {
          glVertex3fv(&mesh->mVertices[face->mVertexIndices[j]].x);
        }
        glEnd();
  }
}
        
void
GlRenderer::InitGL()
{
  glMatrixMode(GL_PROJECTION);
  glLoadIdentity();
  
  glMatrixMode(GL_MODELVIEW);
  glLoadIdentity();

  glEnable(GL_CULL_FACE);
  glShadeModel(GL_FLAT);
  glEnable(GL_DEPTH_TEST);
  glEnable(GL_CULL_FACE);
  
  InitExtensions();
  
#if 0
  GLfloat mat_ambient[]   = {  0.5, 0.5, 0.5, 1.0  };
  /*  mat_specular and mat_shininess are NOT default values     */
  GLfloat mat_diffuse[]   = {  1.0, 1.0, 1.0, 1.0  };
  GLfloat mat_specular[]  = {  0.3, 0.3, 0.3, 1.0  };
  GLfloat mat_shininess[] = {  1.0  };
  
  GLfloat light_ambient[]  = {  0.2, 0.2, 0.2, 1.0  };
  GLfloat light_diffuse[]  = {  0.4, 0.4, 0.4, 1.0  };
  GLfloat light_specular[] = {  0.3, 0.3, 0.3, 1.0  };
  
  GLfloat lmodel_ambient[] = {  0.3, 0.3, 0.3, 1.0  };
  
  
  // default Material
  glMaterialfv(GL_FRONT, GL_AMBIENT, mat_ambient);
  glMaterialfv(GL_FRONT, GL_DIFFUSE, mat_diffuse);
  glMaterialfv(GL_FRONT, GL_SPECULAR, mat_specular);
  glMaterialfv(GL_FRONT, GL_SHININESS, mat_shininess);

  // a light
  glLightfv(GL_LIGHT0, GL_AMBIENT, light_ambient);
  glLightfv(GL_LIGHT0, GL_DIFFUSE, light_diffuse);
  glLightfv(GL_LIGHT0, GL_SPECULAR, light_specular);
  
  glLightfv(GL_LIGHT1, GL_AMBIENT, light_ambient);
  glLightfv(GL_LIGHT1, GL_DIFFUSE, light_diffuse);
  glLightfv(GL_LIGHT1, GL_SPECULAR, light_specular);
  
  glLightModelfv(GL_LIGHT_MODEL_AMBIENT, lmodel_ambient);
  
  glEnable(GL_LIGHTING);
  glEnable(GL_LIGHT0);
  glEnable(GL_LIGHT1);
  
  
  // set position of the light
  GLfloat infinite_light[] = {  1.0, 0.8, 1.0, 0.0  };
  glLightfv (GL_LIGHT0, GL_POSITION, infinite_light);
  
  // set position of the light2
  GLfloat infinite_light2[] = {  -0.3, 1.5, 1.0, 0.0  };
  glLightfv (GL_LIGHT1, GL_POSITION, infinite_light2);
  
  glColorMaterial( GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE);
  //   glColorMaterial( GL_FRONT_AND_BACK, GL_SPECULAR);
  glEnable(GL_COLOR_MATERIAL);
  
  glShadeModel( GL_FLAT );
  
  glDepthFunc( GL_LESS );
  glEnable( GL_DEPTH_TEST );
#endif

  glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE );

  glEnable( GL_NORMALIZE );
  
  glClearColor(0.0f, 0.0f, 1.0f, 1.0f);
}


void
GlRenderer::SetupProjection(const int w, const int h, const float angle)
{
  glViewport(0, 0, w, h);
  glMatrixMode(GL_PROJECTION);
  glLoadIdentity();
  gluPerspective(angle, 1.0, 0.1, 2.0*Magnitude(mSceneGraph->GetBox().Diagonal()));
  glMatrixMode(GL_MODELVIEW);
}



void
GlRenderer::SetupCamera()
{
  Vector3 target = mViewPoint + mViewDirection;

  Vector3 up(0,1,0);
  
  if (abs(DotProd(mViewDirection, up)) > 0.99f)
        up = Vector3(1, 0, 0);
  
  glLoadIdentity();
  gluLookAt(mViewPoint.x, mViewPoint.y, mViewPoint.z,
                        target.x, target.y, target.z,
                        up.x, up.y, up.z);
}

void
GlRenderer::_RenderScene()
{
  ObjectContainer::const_iterator oi = mObjects.begin();

  for (; oi != mObjects.end(); oi++)
        RenderIntersectable(*oi);
}

bool
GlRenderer::RenderScene()
{
  static int glList = -1;
  if (mUseGlLists) {
        if (glList == -1) {
          glList = glGenLists(1);
          glNewList(glList, GL_COMPILE);
          _RenderScene();
          glEndList();
        }
        glCallList(glList);
  } else
        _RenderScene();
        
  
  return true;
}


void
GlRendererBuffer::EvalQueryWithItemBuffer(
                                                                                  //RenderCostSample &sample
                                                                           )
{
        // read back the texture
        glReadPixels(0, 0,
                                GetWidth(), GetHeight(),
                                GL_RGBA,
                                GL_UNSIGNED_BYTE,
                                mPixelBuffer);
                
                        
        unsigned int *p = mPixelBuffer;
                        
        for (int y = 0; y < GetHeight(); y++)
        {
                for (int x = 0; x < GetWidth(); x++, p++) 
                {
                        unsigned int id = (*p) & 0xFFFFFF;

                        if (id != 0xFFFFFF)
                                ++ mObjects[id]->mCounter;
                }
        }
}



/****************************************************************/
/*               GlRendererBuffer implementation                */
/****************************************************************/



GlRendererBuffer::GlRendererBuffer(SceneGraph *sceneGraph,
                                                                   ViewCellsManager *viewcells,
                                                                   KdTree *tree):
GlRenderer(sceneGraph, viewcells, tree)  
{
        mPixelBuffer = NULL;

        // implement width and height in subclasses
}


void
GlRendererBuffer::EvalQueryWithOcclusionQueries(
                                                                           //RenderCostSample &sample
                                                                           )
{
        glDepthFunc(GL_LEQUAL);
                
        glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE);
        glDepthMask(GL_FALSE);


        // simulate detectemptyviewspace using backface culling
        if (mDetectEmptyViewSpace) 
        {
                glEnable(GL_CULL_FACE);
                //cout << "culling" << endl;
        }
        else
        {
                //cout << "not culling" << endl;
                glDisable(GL_CULL_FACE);
        }

        
        //const int numQ = 1;
        const int numQ = (int)mOcclusionQueries.size();
        
        //glFinish();
#if 0
        //-- now issue queries for all objects
        for (int j = 0; j < (int)mObjects.size(); ++ j) 
        {
                mOcclusionQueries[j]->BeginQuery();
                RenderIntersectable(mObjects[j]);
                mOcclusionQueries[j]->EndQuery();

                unsigned int pixelCount;

                pixelCount = mOcclusionQueries[j]->GetQueryResult();
                mObjects[j]->mCounter += pixelCount;
        }
#else

        int q = 0;

        //-- now issue queries for all objects
        for (int j = 0; j < (int)mObjects.size(); j += q) 
        {       
                for (q = 0; ((j + q) < (int)mObjects.size()) && (q < numQ); ++ q) 
                {
                        //glFinish();
                        mOcclusionQueries[q]->BeginQuery();
                        
                        RenderIntersectable(mObjects[j + q]);
                
                        mOcclusionQueries[q]->EndQuery();
                        //glFinish();
                }
                //cout << "q: " << q << endl;
                // collect results of the queries
                for (int t = 0; t < q; ++ t) 
                {
                        unsigned int pixelCount;
                
                        //-- reenable other state
#if 0
                        bool available;

                        do 
                        {
                                available = mOcclusionQueries[t]->ResultAvailable();
                                
                                if (!available) cout << "W";
                        } 
                        while (!available);
#endif

                        pixelCount = mOcclusionQueries[t]->GetQueryResult();

                        //if (pixelCount > 0)
                        //      cout <<"o="<<j+q<<" q="<<mOcclusionQueries[q]->GetQueryId()<<" pc="<<pixelCount<<" ";
                        mObjects[j + t]->mCounter += pixelCount;
                }

                //j += q;
        }
#endif
        //glFinish();
        glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
        glDepthMask(GL_TRUE);
        
        glEnable(GL_CULL_FACE);
}


void
GlRendererBuffer::RandomViewPoint()
{ 
  // do not use this function since it could return different viewpoints for
  // different executions of the algorithm

  //  mViewCellsManager->GetViewPoint(mViewPoint);

  while (1) {
        Vector3 pVector = Vector3(halton.GetNumber(1),
                                                          halton.GetNumber(2),
                                                          halton.GetNumber(3));
        
        mViewPoint =  mViewCellsManager->GetViewSpaceBox().GetPoint(pVector);
        ViewCell *v = mViewCellsManager->GetViewCell(mViewPoint);
        if (v && v->GetValid())
          break;
        // generate a new vector
        halton.GenerateNext();
  }
  
  Vector3 dVector = Vector3(2*M_PI*halton.GetNumber(4),
                                                        M_PI*halton.GetNumber(5),
                                                        0.0f);
  
  mViewDirection = Normalize(Vector3(sin(dVector.x),
                                                                         //                                                                      cos(dVector.y),
                                                                         0.0f,
                                                                         cos(dVector.x)));
  halton.GenerateNext();
}


}