/home/master/UCL/VisualizationLibrary/src/vlGraphics/EdgeRenderer.cpp

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/*  Visualization Library                                                             */
/*  http://visualizationlibrary.org                                                   */
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/*  Copyright (c) 2005-2010, Michele Bosi                                             */
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#include <vlCore/GlobalSettings.hpp>
#include <vlGraphics/EdgeRenderer.hpp>
#include <vlGraphics/RenderQueue.hpp>
#include <vlGraphics/OpenGLContext.hpp>

using namespace vl;

//-----------------------------------------------------------------------------
const RenderQueue* EdgeRenderer::render(const RenderQueue* render_queue, Camera* camera, real frame_clock)
{
  // skip if renderer is disabled

  if (enableMask() == 0)
    return render_queue;

  // enter/exit behavior contract

  class InOutContract 
  {
    RendererAbstract* mRenderer;
  public:
    InOutContract(RendererAbstract* renderer, Camera* camera): mRenderer(renderer)
    {
      // increment the render tick.
      mRenderer->incrementRenderTick();

      // render-target activation.
      // note: an OpenGL context can have multiple rendering targets!
      mRenderer->framebuffer()->activate();

      // viewport setup.
      camera->viewport()->setClearFlags( mRenderer->clearFlags() );
      camera->viewport()->activate();

      // dispatch the renderer-started event.
      mRenderer->dispatchOnRendererStarted();

      // check user-generated errors.
      VL_CHECK_OGL()
    }

    ~InOutContract()
    {
      // dispatch the renderer-finished event
      mRenderer->dispatchOnRendererFinished();

      // check user-generated errors.
      VL_CHECK_OGL()
    }
  } contract(this, camera);

  // --------------- rendering --------------- 

  // update actor cache

  mVisibleActors.clear();
  for(int i=0; i<render_queue->size(); ++i)
  {
    if ( !isEnabled(render_queue->at(i)->mActor->enableMask()) )
      continue;
    // fails for non-Geometry renderables
    WFInfo* wfinfo = declareActor(render_queue->at(i)->mActor);
    if (wfinfo)
    {
      mVisibleActors[render_queue->at(i)->mActor] = wfinfo;
    }
  }

  camera->applyProjMatrix();

  // solid
  glEnable(GL_DEPTH_TEST);
  glDepthFunc(GL_LEQUAL);
  glEnable(GL_POLYGON_OFFSET_FILL);
  glPolygonOffset( polygonOffsetFactor(), polygonOffsetUnits() );
  glColorMask(0,0,0,0);
    renderSolids(camera, frame_clock);
  glDisable(GL_POLYGON_OFFSET_FILL);
  glPolygonOffset( 0.0f, 0.0f );
  glPolygonOffset(0,0);
  glColorMask(1,1,1,1);

  // front wireframe
  glLineWidth(mLineWidth);
  if (smoothLines())
  {
    glEnable(GL_BLEND);
    glEnable(GL_LINE_SMOOTH);
  }
  renderLines(camera);

  // back wireframe
  glDisable(GL_DEPTH_TEST);
  glLineWidth(mLineWidth > 2.0f ? mLineWidth / 2.0f : 1.0f);
#if defined(VL_OPENGL)
  glLineStipple(1,0xF0F0);
  glEnable(GL_LINE_STIPPLE);
#endif
  if (showHiddenLines()) 
    renderLines(camera);
  glDisable(GL_LINE_SMOOTH);
#if defined(VL_OPENGL)
  glDisable(GL_LINE_STIPPLE);
#endif
  glDisable(GL_BLEND);
  glLineWidth(1.0f);

  // was enabled by viewport
  glDisable(GL_SCISSOR_TEST);

  // disable all vertex arrays
  framebuffer()->openglContext()->bindVAS(NULL, false, true);

  VL_CHECK( !globalSettings()->checkOpenGLStates() || framebuffer()->openglContext()->isCleanState(true) );

  return render_queue;
}
//-----------------------------------------------------------------------------
void EdgeRenderer::renderSolids(Camera* camera, real frame_clock)
{
  // transform
  const Transform* cur_transform = NULL;
  camera->applyViewMatrix();

  const mat4& view_matrix = camera->viewMatrix();

  for( std::map< ref<Actor>, ref<WFInfo> >::iterator it = mVisibleActors.begin(); it != mVisibleActors.end(); ++it)
  {
    ref<Actor> actor = it->first;
    VL_CHECK(actor);
    VL_CHECK(actor->lod(0));
    WFInfo* wfinfo = it->second.get();
    VL_CHECK(wfinfo);

    // --------------- transform ---------------

    // delta-setup for modelview matrix for the object
    if ( actor->transform() != cur_transform )
    {
      cur_transform = actor->transform();

      if ( cur_transform )
      {
        #if 0
          glMatrixMode(GL_MODELVIEW);
          VL_glLoadMatrix( view_matrix.ptr() );
          VL_glMultMatrix( cur_transform->worldMatrix().ptr() );
        #else
          // should guarantee better precision
          glMatrixMode(GL_MODELVIEW);
          VL_glLoadMatrix( (view_matrix * cur_transform->worldMatrix() ).ptr() );
        #endif
      }
      else
      {
        glMatrixMode(GL_MODELVIEW);
        VL_glLoadMatrix( view_matrix.ptr() );
      }
    }

    // note: the color is not important here
    wfinfo->mEdgeCallback->setShowCreases(showCreases());
    wfinfo->mEdgeCallback->onActorRenderStarted( actor.get(), frame_clock, camera, wfinfo->mGeometry.get(), NULL, 0 );
    actor->lod(0)->render( actor.get(), NULL, camera, framebuffer()->openglContext() );
  }
}
//-----------------------------------------------------------------------------
void EdgeRenderer::renderLines(Camera* camera)
{
  // transform
  const Transform* cur_transform = NULL;
  camera->applyViewMatrix();

  const mat4& view_matrix = camera->viewMatrix();

  for( std::map< ref<Actor>, ref<WFInfo> >::iterator it = mVisibleActors.begin(); it != mVisibleActors.end(); ++it)
  {
    ref<Actor> actor = it->first;
    WFInfo* wfinfo = it->second.get();

    // --------------- transform ---------------

    // delta-setup for modelview matrix for the object
    if ( actor->transform() != cur_transform )
    {
      cur_transform = actor->transform();

      if ( cur_transform )
      {
        #if 0
          glMatrixMode(GL_MODELVIEW);
          VL_glLoadMatrix( view_matrix.ptr() );
          VL_glMultMatrix( cur_transform->worldMatrix().ptr() );
        #else
          // should guarantee better precision
          glMatrixMode(GL_MODELVIEW);
          VL_glLoadMatrix( (view_matrix * cur_transform->worldMatrix() ).ptr() );
        #endif
      }
      else
      {
        glMatrixMode(GL_MODELVIEW);
        VL_glLoadMatrix( view_matrix.ptr() );
      }
    }

    // note: no rendering callbacks here
    glColor4fv( wfinfo->mColor.ptr() );
    wfinfo->mGeometry->render( actor.get(), NULL, camera, framebuffer()->openglContext() );
  }
}
//-----------------------------------------------------------------------------
EdgeRenderer::WFInfo* EdgeRenderer::declareActor(Actor* act, const fvec4& color)
{
  std::map< ref<Actor>, ref<WFInfo> >::iterator it = mActorCache.find( act );
  if (it!=mActorCache.end())
  {
    it->second->mColor = color;
    return it->second.get();
  }
  else
  {
    ref<WFInfo> info = new WFInfo;
    EdgeExtractor ee;
    ee.setCreaseAngle( creaseAngle() );
    if (ee.extractEdges(act))
    {
      info->mGeometry = ee.generateEdgeGeometry();
      info->mEdgeCallback = new EdgeUpdateCallback(ee.edges());
      if (info->mGeometry)
      {
        info->mColor = color;
        mActorCache[act] = info;
        return info.get();
      }
    }
  }
  return NULL;
}
//-----------------------------------------------------------------------------
EdgeRenderer::WFInfo* EdgeRenderer::declareActor(Actor* act)
{
  std::map< ref<Actor>, ref<WFInfo> >::iterator it = mActorCache.find( act );
  if (it!=mActorCache.end())
    return it->second.get();
  else
  {
    ref<WFInfo> info = new WFInfo;
    EdgeExtractor ee;
    ee.setCreaseAngle( creaseAngle() );
    if (ee.extractEdges(act))
    {
      info->mGeometry = ee.generateEdgeGeometry();
      info->mEdgeCallback = new EdgeUpdateCallback(ee.edges());
      if (info->mGeometry)
      {
        info->mColor = mDefaultLineColor;
        mActorCache[act] = info;
        return info.get();
      }
    }
  }
  return NULL;
}
//-----------------------------------------------------------------------------