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RAS_BucketManager.cpp

/**
 * $Id: RAS_BucketManager.cpp,v 1.7 2004/07/17 05:23:16 kester Exp $
 * ***** BEGIN GPL/BL DUAL LICENSE BLOCK *****
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version. The Blender
 * Foundation also sells licenses for use in proprietary software under
 * the Blender License.  See http://www.blender.org/BL/ for information
 * about this.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 * The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
 * All rights reserved.
 *
 * The Original Code is: all of this file.
 *
 * Contributor(s): none yet.
 *
 * ***** END GPL/BL DUAL LICENSE BLOCK *****
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#ifdef WIN32
// don't show these anoying STL warnings
#pragma warning (disable:4786)
#endif

#include "GEN_Map.h"
#include "RAS_MaterialBucket.h"
#include "STR_HashedString.h"
#include "RAS_MeshObject.h"
#define KX_NUM_MATERIALBUCKETS 100
#include "RAS_IRasterizer.h"
#include "RAS_IRenderTools.h"

#include "RAS_BucketManager.h"

#include <set>

RAS_BucketManager::RAS_BucketManager()
{

}

RAS_BucketManager::~RAS_BucketManager()
{
            RAS_BucketManagerClearAll();
}

/**
 * struct alphamesh holds a mesh, (m_ms) it's depth, (m_z) and the bucket it came from (m_bucket.)
 */
00066 struct RAS_BucketManager::alphamesh
{
public:
      MT_Scalar m_z;
      RAS_MaterialBucket::T_MeshSlotList::iterator m_ms;
      RAS_MaterialBucket *m_bucket;
      alphamesh(MT_Scalar z, RAS_MaterialBucket::T_MeshSlotList::iterator &ms, RAS_MaterialBucket *bucket) :
            m_z(z),
            m_ms(ms),
            m_bucket(bucket)
      {}
};

struct RAS_BucketManager::backtofront
{
      bool operator()(const alphamesh &a, const alphamesh &b)
      {
            return a.m_z < b.m_z;
      }
};
      

void RAS_BucketManager::RenderAlphaBuckets(
      const MT_Transform& cameratrans, RAS_IRasterizer* rasty, RAS_IRenderTools* rendertools)
{
      BucketList::iterator bit;
      std::multiset<alphamesh, backtofront> alphameshset;
      RAS_MaterialBucket::T_MeshSlotList::iterator mit;
      
      /* Camera's near plane equation: cam_norm.dot(point) + cam_origin */
      const MT_Vector3 cam_norm(cameratrans.getBasis()[2]);
      const MT_Scalar cam_origin = cameratrans.getOrigin()[2];
      for (bit = m_AlphaBuckets.begin(); bit != m_AlphaBuckets.end(); ++bit)
      {
            (*bit)->ClearScheduledPolygons();
            for (mit = (*bit)->msBegin(); mit != (*bit)->msEnd(); ++mit)
            {
                  if ((*mit).m_bVisible)
                  {
                        MT_Point3 pos((*mit).m_OpenGLMatrix[12], (*mit).m_OpenGLMatrix[13], (*mit).m_OpenGLMatrix[14]);
                        alphameshset.insert(alphamesh(MT_dot(cam_norm, pos) + cam_origin, mit, *bit));
                  }
            }
      }
      
      // It shouldn't be strictly necessary to disable depth writes; but
      // it is needed for compatibility.
      rasty->SetDepthMask(RAS_IRasterizer::KX_DEPTHMASK_DISABLED);

      std::multiset< alphamesh, backtofront>::iterator msit = alphameshset.begin();
      for (; msit != alphameshset.end(); ++msit)
      {
            (*msit).m_bucket->RenderMeshSlot(cameratrans, rasty, rendertools, *(*msit).m_ms,
                  (*msit).m_bucket->ActivateMaterial(cameratrans, rasty, rendertools));
      }
      
      rasty->SetDepthMask(RAS_IRasterizer::KX_DEPTHMASK_ENABLED);
}

void RAS_BucketManager::Renderbuckets(
      const MT_Transform& cameratrans, RAS_IRasterizer* rasty, RAS_IRenderTools* rendertools)
{
      BucketList::iterator bucket;
      
      rasty->EnableTextures(false);
      rasty->SetDepthMask(RAS_IRasterizer::KX_DEPTHMASK_ENABLED);
      
      // beginning each frame, clear (texture/material) caching information
      rasty->ClearCachingInfo();

      RAS_MaterialBucket::StartFrame();
      for (bucket = m_MaterialBuckets.begin(); bucket != m_MaterialBuckets.end(); ++bucket)
      {
            (*bucket)->ClearScheduledPolygons();
      }
      
      for (bucket = m_MaterialBuckets.begin(); bucket != m_MaterialBuckets.end(); ++bucket)
            (*bucket)->Render(cameratrans,rasty,rendertools);
      
      RenderAlphaBuckets(cameratrans, rasty, rendertools);  
      
      RAS_MaterialBucket::EndFrame();
}

RAS_MaterialBucket* RAS_BucketManager::RAS_BucketManagerFindBucket(RAS_IPolyMaterial * material)
{
      BucketList::iterator it;
      for (it = m_MaterialBuckets.begin(); it != m_MaterialBuckets.end(); it++)
      {
            if (*(*it)->GetPolyMaterial() == *material)
                  return *it;
      }
      
      for (it = m_AlphaBuckets.begin(); it != m_AlphaBuckets.end(); it++)
      {
            if (*(*it)->GetPolyMaterial() == *material)
                  return *it;
      }
      
      RAS_MaterialBucket *bucket = new RAS_MaterialBucket(material);
      if (bucket->IsTransparant())
            m_AlphaBuckets.push_back(bucket);
      else
            m_MaterialBuckets.push_back(bucket);
      
      return bucket;
}

void RAS_BucketManager::RAS_BucketManagerClearAll()
{
      BucketList::iterator it;
      for (it = m_MaterialBuckets.begin(); it != m_MaterialBuckets.end(); it++)
      {
            delete (*it);
      }
      for (it = m_AlphaBuckets.begin(); it != m_AlphaBuckets.end(); it++)
      {
            delete(*it);
      }
      
      m_MaterialBuckets.clear();
      m_AlphaBuckets.clear();
}

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