text: /****************************************************************************
  Copyright (c) 2010-2011 cocos2d-x.org
  Copyright (c) 2008-2010 Ricardo Quesada
  
  http://www.cocos2d-x.org
  
  Permission is hereby granted, free of charge, to any person obtaining a copy
  of this software and associated documentation files (the "Software"), to deal
  in the Software without restriction, including without limitation the rights
  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  copies of the Software, and to permit persons to whom the Software is
  furnished to do so, subject to the following conditions:
  
  The above copyright notice and this permission notice shall be included in
  all copies or substantial portions of the Software.
  
  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  THE SOFTWARE.
  ****************************************************************************/
  #include "CCParticleSystemPoint.h"
  #include "platform/CCGL.h"
  
  namespace cocos2d {
  
  //implementation CCParticleSystemPoint
  bool CCParticleSystemPoint::initWithTotalParticles(int numberOfParticles)
  {
  	if( CCParticleSystem::initWithTotalParticles(numberOfParticles) )
  	{
  		m_pVertices = new ccPointSprite[m_nTotalParticles];
  
  		if( ! m_pVertices )
  		{
  			CCLOG("cocos2d: Particle system: not enough memory");
  			this->release();
  			return false;
  		}
  
  #if CC_USES_VBO
  		glGenBuffers(1, &m_uVerticesID);
  
  		// initial binding
  		glBindBuffer(GL_ARRAY_BUFFER, m_uVerticesID);
  		glBufferData(GL_ARRAY_BUFFER, sizeof(ccPointSprite)*m_nTotalParticles, m_pVertices, GL_DYNAMIC_DRAW);
  		glBindBuffer(GL_ARRAY_BUFFER, 0);
  #endif
  		return true;
  	}
  	return false;
  }
  CCParticleSystemPoint::~CCParticleSystemPoint()
  {
      CC_SAFE_DELETE(m_pVertices);
  #if CC_USES_VBO
  	glDeleteBuffers(1, &m_uVerticesID);
  #endif
  }
  
  // implementation CCParticleSystemPoint
  CCParticleSystemPoint * CCParticleSystemPoint::particleWithFile(const char *plistFile)
  {
      CCParticleSystemPoint *pRet = new CCParticleSystemPoint();
      if (pRet && pRet->initWithFile(plistFile))
      {
          pRet->autorelease();
          return pRet;
      }
      CC_SAFE_DELETE(pRet)
          return pRet;
  }
  
  void CCParticleSystemPoint::updateQuadWithParticle(tCCParticle* particle, CCPoint newPosition)
  {
  	// place vertices and colos in array
      m_pVertices[m_nParticleIdx].pos = vertex2(newPosition.x, newPosition.y);
  	m_pVertices[m_nParticleIdx].size = particle->size;
  	m_pVertices[m_nParticleIdx].colors = particle->color;
  }
  void CCParticleSystemPoint::postStep()
  {
  #if CC_USES_VBO
  	glBindBuffer(GL_ARRAY_BUFFER, m_uVerticesID);
  	glBufferSubData(GL_ARRAY_BUFFER, 0, sizeof(ccPointSprite)*m_nParticleCount, m_pVertices);
  	glBindBuffer(GL_ARRAY_BUFFER, 0);
  #endif
  }
  void CCParticleSystemPoint::draw()
  {
  	if (m_nParticleIdx==0)
  	{
  		return;
  	}
  
  	// Default GL states: GL_TEXTURE_2D, GL_VERTEX_ARRAY, GL_COLOR_ARRAY, GL_TEXTURE_COORD_ARRAY
  	// Needed states: GL_TEXTURE_2D, GL_VERTEX_ARRAY, GL_COLOR_ARRAY
  	// Unneeded states: GL_TEXTURE_COORD_ARRAY
  	glDisableClientState(GL_TEXTURE_COORD_ARRAY);
  
  	glBindTexture(GL_TEXTURE_2D, m_pTexture->getName());
  
  	glEnable(GL_POINT_SPRITE_OES);
  	glTexEnvi( GL_POINT_SPRITE_OES, GL_COORD_REPLACE_OES, GL_TRUE );	
  
  #define kPointSize sizeof(m_pVertices[0])
  
  #if CC_USES_VBO
  	glBindBuffer(GL_ARRAY_BUFFER, m_uVerticesID);
  
  #if CC_ENABLE_CACHE_TEXTTURE_DATA
      glBufferData(GL_ARRAY_BUFFER, sizeof(ccPointSprite)*m_nTotalParticles, m_pVertices, GL_DYNAMIC_DRAW);
  #endif
  
  	glVertexPointer(2,GL_FLOAT,kPointSize,0);
  
  	glColorPointer(4, GL_FLOAT, kPointSize,(GLvoid*) offsetof(ccPointSprite,colors) );
  
  	glEnableClientState(GL_POINT_SIZE_ARRAY_OES);
  	glPointSizePointerOES(GL_FLOAT,kPointSize,(GLvoid*) offsetof(ccPointSprite,size) );
  #else // Uses Vertex Array List
      int offset = (int)m_pVertices;
      glVertexPointer(2,GL_FLOAT, kPointSize, (GLvoid*) offset);
  
      int diff = offsetof(ccPointSprite, colors);
      glColorPointer(4, GL_FLOAT, kPointSize, (GLvoid*) (offset+diff));
  
      glEnableClientState(GL_POINT_SIZE_ARRAY_OES);
      diff = offsetof(ccPointSprite, size);
      glPointSizePointerOES(GL_FLOAT, kPointSize, (GLvoid*) (offset+diff));
  #endif 
  
      bool newBlend = (m_tBlendFunc.src != CC_BLEND_SRC || m_tBlendFunc.dst != CC_BLEND_DST) ? true : false;
  	if( newBlend ) 
  	{
  		glBlendFunc( m_tBlendFunc.src, m_tBlendFunc.dst );
  	}
  
  	glDrawArrays(GL_POINTS, 0, m_nParticleIdx);
  
  	// restore blend state
  	if( newBlend )
  		glBlendFunc( CC_BLEND_SRC, CC_BLEND_DST);
  
  #if CC_USES_VBO
  	// unbind VBO buffer
  	glBindBuffer(GL_ARRAY_BUFFER, 0);
  #endif
  
  	glDisableClientState(GL_POINT_SIZE_ARRAY_OES);
  	glDisable(GL_POINT_SPRITE_OES);
  
  	// restore GL default state
  	glEnableClientState(GL_TEXTURE_COORD_ARRAY);
  }
  
  // Non supported properties
  
  //
  // SPIN IS NOT SUPPORTED
  //
  void CCParticleSystemPoint::setStartSpin(float var)
  {
  	CCAssert(var == 0, "PointParticleSystem doesn't support spinning");
  	CCParticleSystem::setStartSpin(var);
  }
  void CCParticleSystemPoint::setStartSpinVar(float var)
  {
  	CCAssert(var == 0, "PointParticleSystem doesn't support spinning");
  	CCParticleSystem::setStartSpinVar(var);
  }
  void CCParticleSystemPoint::setEndSpin(float var)
  {
  	CCAssert(var == 0, "PointParticleSystem doesn't support spinning");
  	CCParticleSystem::setEndSpin(var);
  }
  void CCParticleSystemPoint::setEndSpinVar(float var)
  {
  	CCAssert(var == 0, "PointParticleSystem doesn't support spinning");
  	CCParticleSystem::setEndSpinVar(var);
  }
  //
  // SIZE > 64 IS NOT SUPPORTED
  //
  void CCParticleSystemPoint::setStartSize(float size)
  {
  	CCAssert(size >= 0 && size <= CC_MAX_PARTICLE_SIZE, "PointParticleSystem only supports 0 <= size <= 64");
  	CCParticleSystem::setStartSize(size);
  }
  void CCParticleSystemPoint::setEndSize(float size)
  {
  	CCAssert( (size == kCCParticleStartSizeEqualToEndSize) ||
  		( size >= 0 && size <= CC_MAX_PARTICLE_SIZE), "PointParticleSystem only supports 0 <= size <= 64");
  	CCParticleSystem::setEndSize(size);
  }
  
  }// namespace cocos2d
  