C++ TerrainBlock类代码示例

//--------------------------------------------------------------------------
U32 blTerrainProxy::getResourceCRC()
{
   TerrainBlock * terrain = getObject();
   if(!terrain)
      return(0);
   return(terrain->getCRC());
}

//--------------------------------------------------------------------------
bool blTerrainProxy::setPersistInfo(PersistInfo::PersistChunk * info)
{
   if(!Parent::setPersistInfo(info))
      return(false);

   blTerrainChunk * chunk = dynamic_cast<blTerrainChunk*>(info);
   AssertFatal(chunk, "blTerrainProxy::setPersistInfo: invalid info chunk!");

   TerrainBlock * terrain = getObject();
   if(!terrain || !terrain->getLightMap())
      return(false);

   terrain->setLightMap( new GBitmap( *chunk->mLightmap) );

   return(true);
}

void EditTSCtrl::renderMissionArea()
{
   MissionArea* obj = MissionArea::getServerObject();
   if ( !obj )
      return;

   if ( !mRenderMissionArea && !obj->isSelected() )
      return;

   GFXDEBUGEVENT_SCOPE( Editor_renderMissionArea, ColorI::WHITE );

   F32 minHeight = 0.0f;
   F32 maxHeight = 0.0f;

   TerrainBlock* terrain = getActiveTerrain();
   if ( terrain )
   {
      terrain->getMinMaxHeight( &minHeight, &maxHeight );
      Point3F pos = terrain->getPosition();

      maxHeight += pos.z + mMissionAreaHeightAdjust;
      minHeight += pos.z - mMissionAreaHeightAdjust;
   }

   const RectI& area = obj->getArea();
   Box3F areaBox( area.point.x,
                  area.point.y,
                  minHeight,
                  area.point.x + area.extent.x,
                  area.point.y + area.extent.y,
                  maxHeight );

   GFXDrawUtil* drawer = GFX->getDrawUtil();

   GFXStateBlockDesc desc;
   desc.setCullMode( GFXCullNone );
   desc.setBlend( true );
   desc.setZReadWrite( false, false );

   desc.setFillModeSolid();
   drawer->drawCube( desc, areaBox, mMissionAreaFillColor );

   desc.setFillModeWireframe();
   drawer->drawCube( desc, areaBox, mMissionAreaFrameColor );
}

void TerrainBlock::Tessellate(uint32 *pCountStrips, Terrain * pTerrain)
{
	//GeoMipmapCode
	if(m_useGeoMipmap)
	{
		TessellateGeoMipmap(pTerrain);
		return;
	}

/** define to use depth first transversing*/
#define USE_DEPTH_FIRST_TESSELLATE
#ifdef USE_DEPTH_FIRST_TESSELLATE
	// depth first using recursive functions. 
	if(Tessellate_NonRecursive(pCountStrips, pTerrain))
	{
		m_pChildren[0]->Tessellate(pCountStrips, pTerrain);
		m_pChildren[1]->Tessellate(pCountStrips, pTerrain);
		m_pChildren[2]->Tessellate(pCountStrips, pTerrain);
		m_pChildren[3]->Tessellate(pCountStrips, pTerrain);
	}
#else
	queue_TerrainBlockPtr_Type queueBlocks;
	queueBlocks.push((TerrainBlock*)this);
	/// breadth first transversing the quad tree 
	while(!queueBlocks.empty())
	{
		TerrainBlock* pBlock = queueBlocks.front();
		queueBlocks.pop();
		if(pBlock->Tessellate_NonRecursive(pCountStrips, pTerrain))
		{
			queueBlocks.push(pBlock->m_pChildren[0]);
			queueBlocks.push(pBlock->m_pChildren[1]);
			queueBlocks.push(pBlock->m_pChildren[2]);
			queueBlocks.push(pBlock->m_pChildren[3]);
		}
	}
#endif
}

// Given a ray, this will return the color from the lightmap of this object, return true if handled
bool blTerrainSystem::getColorFromRayInfo(const RayInfo & collision, ColorF& result) const
{
   TerrainBlock *terrain = dynamic_cast<TerrainBlock *>(collision.object);
   if (!terrain)
      return false;

   Point2F uv;
   F32 terrainlength = (F32)terrain->getBlockSize();
   Point3F pos = terrain->getPosition();
   uv.x = (collision.point.x - pos.x) / terrainlength;
   uv.y = (collision.point.y - pos.y) / terrainlength;

   // similar to x = x & width...
   uv.x = uv.x - F32(U32(uv.x));
   uv.y = uv.y - F32(U32(uv.y));
   const GBitmap* lightmap = terrain->getLightMap();
   if (!lightmap)
      return false;

   result = lightmap->sampleTexel(uv.x, uv.y);
   // terrain lighting is dim - look into this (same thing done in shaders)...
   result *= 2.0f;
   return true;
}

//RBP - Global function declared in Terrdata.h
TerrainBlock* getTerrainUnderWorldPoint(const Point3F & wPos)
{
	// Cast a ray straight down from the world position and see which
	// Terrain is the closest to our starting point
	Point3F startPnt = wPos;
	Point3F endPnt = wPos + Point3F(0.0f, 0.0f, -10000.0f);

	S32 blockIndex = -1;
	F32 nearT = 1.0f;

	SimpleQueryList queryList;
	gServerContainer.findObjects( TerrainObjectType, SimpleQueryList::insertionCallback, &queryList);

	for (U32 i = 0; i < queryList.mList.size(); i++)
	{
		Point3F tStartPnt, tEndPnt;
		TerrainBlock* terrBlock = dynamic_cast<TerrainBlock*>(queryList.mList[i]);
		terrBlock->getWorldTransform().mulP(startPnt, &tStartPnt);
		terrBlock->getWorldTransform().mulP(endPnt, &tEndPnt);

		RayInfo ri;
		if (terrBlock->castRayI(tStartPnt, tEndPnt, &ri, true))
		{
			if (ri.t < nearT)
			{
				blockIndex = i;
				nearT = ri.t;
			}
		}
	}

	if (blockIndex > -1)
		return (TerrainBlock*)(queryList.mList[blockIndex]);

	return NULL;
}

void SoftSelectAction::process(Selection * sel, const Gui3DMouseEvent &, bool selChanged, Type type)
{
   TerrainBlock *terrBlock = mTerrainEditor->getActiveTerrain();
   if ( !terrBlock )
      return;
      
   // allow process of current selection
   Selection tmpSel;
   if(sel == mTerrainEditor->getCurrentSel())
   {
      tmpSel = *sel;
      sel = &tmpSel;
   }

   if(type == Begin || type == Process)
      mFilter.set(1, &mTerrainEditor->mSoftSelectFilter);

   //
   if(selChanged)
   {
      F32 radius = mTerrainEditor->mSoftSelectRadius;
      if(radius == 0.f)
         return;

      S32 squareSize = terrBlock->getSquareSize();
      U32 offset = U32(radius / F32(squareSize)) + 1;

      for(U32 i = 0; i < sel->size(); i++)
      {
         GridInfo & info = (*sel)[i];

         info.mPrimarySelect = true;
         info.mWeight = mFilter.getValue(0);

         if(!mTerrainEditor->getCurrentSel()->add(info))
            mTerrainEditor->getCurrentSel()->setInfo(info);

         Point2F infoPos((F32)info.mGridPoint.gridPos.x, (F32)info.mGridPoint.gridPos.y);

         //
         for(S32 x = info.mGridPoint.gridPos.x - offset; x < info.mGridPoint.gridPos.x + (offset << 1); x++)
            for(S32 y = info.mGridPoint.gridPos.y - offset; y < info.mGridPoint.gridPos.y + (offset << 1); y++)
            {
               //
               Point2F pos((F32)x, (F32)y);

               F32 dist = Point2F(pos - infoPos).len() * F32(squareSize);

               if(dist > radius)
                  continue;

               F32 weight = mFilter.getValue(dist / radius);

               //
               GridInfo gInfo;
               GridPoint gridPoint = info.mGridPoint;
               gridPoint.gridPos.set(x, y);

               if(mTerrainEditor->getCurrentSel()->getInfo(Point2I(x, y), gInfo))
               {
                  if(gInfo.mPrimarySelect)
                     continue;

                  if(gInfo.mWeight < weight)
                  {
                     gInfo.mWeight = weight;
                     mTerrainEditor->getCurrentSel()->setInfo(gInfo);
                  }
               }
               else
               {
                  Vector<GridInfo> gInfos;
                  mTerrainEditor->getGridInfos(gridPoint, gInfos);

                  for (U32 z = 0; z < gInfos.size(); z++)
                  {
                     gInfos[z].mWeight = weight;
                     gInfos[z].mPrimarySelect = false;
                     mTerrainEditor->getCurrentSel()->add(gInfos[z]);
                  }
               }
            }
      }
   }
}

bool SceneCullingState::isOccludedByTerrain( SceneObject* object ) const
{
   PROFILE_SCOPE( SceneCullingState_isOccludedByTerrain );

   // Don't try to occlude globally bounded objects.
   if( object->isGlobalBounds() )
      return false;

   const Vector< SceneObject* >& terrains = getSceneManager()->getContainer()->getTerrains();
   const U32 numTerrains = terrains.size();

   for( U32 terrainIdx = 0; terrainIdx < numTerrains; ++ terrainIdx )
   {
      TerrainBlock* terrain = dynamic_cast< TerrainBlock* >( terrains[ terrainIdx ] );
      if( !terrain )
         continue;

      MatrixF terrWorldTransform = terrain->getWorldTransform();

      Point3F localCamPos = getCameraState().getViewPosition();
      terrWorldTransform.mulP(localCamPos);
      F32 height;
      terrain->getHeight( Point2F( localCamPos.x, localCamPos.y ), &height );
      bool aboveTerrain = ( height <= localCamPos.z );

      // Don't occlude if we're below the terrain.  This prevents problems when
      //  looking out from underground bases...
      if( !aboveTerrain )
         continue;

      const Box3F& oBox = object->getObjBox();
      F32 minSide = getMin(oBox.len_x(), oBox.len_y());
      if (minSide > 85.0f)
         continue;

      const Box3F& rBox = object->getWorldBox();
      Point3F ul(rBox.minExtents.x, rBox.minExtents.y, rBox.maxExtents.z);
      Point3F ur(rBox.minExtents.x, rBox.maxExtents.y, rBox.maxExtents.z);
      Point3F ll(rBox.maxExtents.x, rBox.minExtents.y, rBox.maxExtents.z);
      Point3F lr(rBox.maxExtents.x, rBox.maxExtents.y, rBox.maxExtents.z);

      terrWorldTransform.mulP(ul);
      terrWorldTransform.mulP(ur);
      terrWorldTransform.mulP(ll);
      terrWorldTransform.mulP(lr);

      Point3F xBaseL0_s = ul - localCamPos;
      Point3F xBaseL0_e = lr - localCamPos;
      Point3F xBaseL1_s = ur - localCamPos;
      Point3F xBaseL1_e = ll - localCamPos;

      static F32 checkPoints[3] = {0.75, 0.5, 0.25};
      RayInfo rinfo;
      for( U32 i = 0; i < 3; i ++ )
      {
         Point3F start = (xBaseL0_s * checkPoints[i]) + localCamPos;
         Point3F end   = (xBaseL0_e * checkPoints[i]) + localCamPos;

         if (terrain->castRay(start, end, &rinfo))
            continue;

         terrain->getHeight(Point2F(start.x, start.y), &height);
         if ((height <= start.z) == aboveTerrain)
            continue;

         start = (xBaseL1_s * checkPoints[i]) + localCamPos;
         end   = (xBaseL1_e * checkPoints[i]) + localCamPos;

         if (terrain->castRay(start, end, &rinfo))
            continue;

         Point3F test = (start + end) * 0.5;
         if (terrain->castRay(localCamPos, test, &rinfo) == false)
            continue;

         return true;
      }
   }

   return false;
}

 virtual float getMaxHeight()
 {
    return fixedToFloat(mBlock->findSquare(TerrainBlock::BlockShift, Point2I(0,0))->maxHeight);
 }

void EditTSCtrl::onRightMouseDown(const GuiEvent & event)
{
   // always process the right mouse event first...

   mRightMouseDown = true;
   mLastBorderMoveTime = 0;

   make3DMouseEvent(mLastEvent, event);
   on3DRightMouseDown(mLastEvent);

   if(!mLeftMouseDown && mRightMousePassThru && mProfile->mCanKeyFocus)
   {
      GuiCanvas *pCanvas = getRoot();
      if( !pCanvas )
         return;

      PlatformWindow *pWindow = static_cast<GuiCanvas*>(getRoot())->getPlatformWindow();
      if( !pWindow )
         return;

      PlatformCursorController *pController = pWindow->getCursorController();
      if( !pController )
         return;

      // ok, gotta disable the mouse
      // script functions are lockMouse(true); Canvas.cursorOff();
      pWindow->setMouseLocked(true);
      pCanvas->setCursorON( false );

      if(mDisplayType != DisplayTypePerspective)
      {
         mouseLock();
         mLastMousePos = event.mousePoint;
         pCanvas->setForceMouseToGUI(true);
         mLastMouseClamping = pCanvas->getClampTorqueCursor();
         pCanvas->setClampTorqueCursor(false);
      }

      if(mDisplayType == DisplayTypeIsometric)
      {
         // Store the screen center point on the terrain for a possible rotation
         TerrainBlock* activeTerrain = getActiveTerrain();
         if( activeTerrain )
         {
            F32 extx, exty;
            if(event.modifier & SI_SHIFT)
            {
               extx = F32(event.mousePoint.x);
               exty = F32(event.mousePoint.y);
            }
            else
            {
               extx = getExtent().x * 0.5;
               exty = getExtent().y * 0.5;
            }
            Point3F sp(extx, exty, 0.0f); // Near plane projection
            Point3F start;
            unproject(sp, &start);

            Point3F end = start + mLastEvent.vec * 4000.0f;
            Point3F tStartPnt, tEndPnt;
            activeTerrain->getTransform().mulP(start, &tStartPnt);
            activeTerrain->getTransform().mulP(end, &tEndPnt);

            RayInfo info;
            bool result = activeTerrain->castRay(tStartPnt, tEndPnt, &info);
            if(result)
            {
               info.point.interpolate(start, end, info.t);
               mIsoCamRotCenter = info.point;
            }
            else
            {
               mIsoCamRotCenter = start;
            }
         }
         else
         {
            F32 extx = getExtent().x * 0.5;
            F32 exty = getExtent().y * 0.5;
            Point3F sp(extx, exty, 0.0f); // Near plane projection
            unproject(sp, &mIsoCamRotCenter);
         }
      }

      setFirstResponder();
   }
}

void afxZodiacTerrainRenderer::render(SceneRenderState* state)
{
   PROFILE_SCOPE(afxRenderZodiacTerrainMgr_render);

   // Early out if no terrain zodiacs to draw.
   if (terrain_zodes.size() == 0)
     return;

   initShader();
   if (!zodiac_shader)
     return;

   bool is_reflect_pass = state->isReflectPass();

   // Automagically save & restore our viewport and transforms.
   GFXTransformSaver saver;

   MatrixF proj = GFX->getProjectionMatrix();

   // Set up world transform
   MatrixF world = GFX->getWorldMatrix();
   proj.mul(world);
   shader_consts->set(projection_sc, proj);

   //~~~~~~~~~~~~~~~~~~~~//~~~~~~~~~~~~~~~~~~~~//
   // RENDER EACH ZODIAC
   //
   for (S32 zz = 0; zz < terrain_zodes.size(); zz++)
   {
      TerrainZodiacElem& elem = terrain_zodes[zz];

      TerrainBlock* block = (TerrainBlock*) elem.block;

      afxZodiacMgr::ZodiacSpec* zode = &afxZodiacMgr::terr_zodes[elem.zode_idx];
      if (!zode)
         continue;

      if (is_reflect_pass)
      {
         if ((zode->zflags & afxZodiacData::SHOW_IN_REFLECTIONS) == 0)
            continue;
      }
      else
      {
         if ((zode->zflags & afxZodiacData::SHOW_IN_NON_REFLECTIONS) == 0)
            continue;
      }

      F32 fadebias = zode->calcDistanceFadeBias(elem.camDist);
      if (fadebias < 0.01f)
        continue;

      F32 cos_ang = mCos(elem.ang);
      F32 sin_ang = mSin(elem.ang);

      GFXStateBlock* sb = chooseStateBlock(zode->zflags & afxZodiacData::BLEND_MASK, is_reflect_pass);

      GFX->setShader(zodiac_shader->getShader());
      GFX->setStateBlock(sb);
      GFX->setShaderConstBuffer(shader_consts);

      // set the texture
      GFX->setTexture(0, *zode->txr);
      ColorF zode_color = (ColorF)zode->color;
      zode_color.alpha *= fadebias;
      shader_consts->set(color_sc, zode_color);

      Point3F half_size(zode->radius_xy,zode->radius_xy,zode->radius_xy);

      F32 inv_radius = 1.0f/zode->radius_xy;

      GFXPrimitive cell_prim;
      GFXVertexBufferHandle<TerrVertex> cell_verts;
      GFXPrimitiveBufferHandle  primBuff;
      elem.cell->getRenderPrimitive(&cell_prim, &cell_verts, &primBuff);

      U32 n_nonskirt_tris = TerrCellSpy::getMinCellSize()*TerrCellSpy::getMinCellSize()*2;

      const Point3F* verts = ((TerrCell*)elem.cell)->getZodiacVertexBuffer();
      const U16 *tris = block->getZodiacPrimitiveBuffer();
      if (!tris)
         continue; 

      PrimBuild::begin(GFXTriangleList, 3*n_nonskirt_tris);

      /////////////////////////////////
      U32 n_overlapping_tris = 0;
      U32 idx = 0;
      for (U32 i = 0; i < n_nonskirt_tris; i++)
      {
        Point3F tri_v[3];
        tri_v[0] = verts[tris[idx++]];
        tri_v[1] = verts[tris[idx++]];
        tri_v[2] = verts[tris[idx++]];

        elem.mRenderObjToWorld.mulP(tri_v[0]);
        elem.mRenderObjToWorld.mulP(tri_v[1]);
        elem.mRenderObjToWorld.mulP(tri_v[2]);

        if (!afxTriBoxOverlap2D(zode->pos, half_size, tri_v[0], tri_v[1], tri_v[2]))
//.........这里部分代码省略.........

 virtual float getAltitude(int x, int y)
 {
    return fixedToFloat(mBlock->getHeight(x,y));
 }

 virtual float getSampleSpacing()
 {
    return mBlock->getSquareSize();
 }