axmol/cocos2dx/particle_nodes/CCPointParticleSystem.cpp

/****************************************************************************
Copyright (c) 2010 cocos2d-x.org

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#include "CCPointParticleSystem.h"

namespace cocos2d {

	//implementation CCPointParticleSystem
	bool CCPointParticleSystem::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;
			}

			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);		
			return true;
		}
		return false;
	}
	CCPointParticleSystem::~CCPointParticleSystem()
	{
		delete [] m_pVertices;
		glDeleteBuffers(1, &m_uVerticesID);
	}
	void CCPointParticleSystem::updateQuadWithParticle(tCCParticle* particle, CGPoint newPosition)
	{
		// place vertices and colos in array
		m_pVertices[m_nParticleIdx].pos = newPosition;
		m_pVertices[m_nParticleIdx].size = particle->size;
		m_pVertices[m_nParticleIdx].colors = particle->color;
	}
	void CCPointParticleSystem::postStep()
	{
		glBindBuffer(GL_ARRAY_BUFFER, m_uVerticesID);
		glBufferSubData(GL_ARRAY_BUFFER, 0, sizeof(ccPointSprite)*m_nParticleCount, m_pVertices);
		glBindBuffer(GL_ARRAY_BUFFER, 0);
	}
	void CCPointParticleSystem::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 );	

		glBindBuffer(GL_ARRAY_BUFFER, m_uVerticesID);

		glVertexPointer(2,GL_FLOAT,sizeof(m_pVertices[0]),0);

		glColorPointer(4, GL_FLOAT, sizeof(m_pVertices[0]),(GLvoid*) offsetof(ccPointSprite,colors) );

		glEnableClientState(GL_POINT_SIZE_ARRAY_OES);
		glPointSizePointerOES(GL_FLOAT,sizeof(m_pVertices[0]),(GLvoid*) offsetof(ccPointSprite,size) );


		bool newBlend = false;
		if( m_tBlendFunc.src != CC_BLEND_SRC || m_tBlendFunc.dst != CC_BLEND_DST ) 
		{
			newBlend = true;
			glBlendFunc( m_tBlendFunc.src, m_tBlendFunc.dst );
		}

		// save color mode
#if 0
		glGetTexEnviv(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, &colorMode);
		if( colorModulate )
			glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE );
		else
			glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE );
#endif

		glDrawArrays(GL_POINTS, 0, m_nParticleIdx);

		// restore blend state
		if( newBlend )
			glBlendFunc( CC_BLEND_SRC, CC_BLEND_DST);

#if 0
		// restore color mode
		glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, colorMode);
#endif

		// unbind VBO buffer
		glBindBuffer(GL_ARRAY_BUFFER, 0);

		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 CCPointParticleSystem::setStartSpin(float var)
	{
		NSAssert(var == 0, "PointParticleSystem doesn't support spinning");
		CCParticleSystem::setStartSpin(var);
	}
	void CCPointParticleSystem::setStartSpinVar(float var)
	{
		NSAssert(var == 0, "PointParticleSystem doesn't support spinning");
		CCParticleSystem::setStartSpinVar(var);
	}
	void CCPointParticleSystem::setEndSpin(float var)
	{
		NSAssert(var == 0, "PointParticleSystem doesn't support spinning");
		CCParticleSystem::setEndSpin(var);
	}
	void CCPointParticleSystem::setEndSpinVar(float var)
	{
		NSAssert(var == 0, "PointParticleSystem doesn't support spinning");
		CCParticleSystem::setEndSpinVar(var);
	}
	//
	// SIZE > 64 IS NOT SUPPORTED
	//
	void CCPointParticleSystem::setStartSize(float size)
	{
		NSAssert(size >= 0 && size <= CC_MAX_PARTICLE_SIZE, "PointParticleSystem only supports 0 <= size <= 64");
		CCParticleSystem::setStartSize(size);
	}
	void CCPointParticleSystem::setEndSize(float size)
	{
		NSAssert( (size == kCCParticleStartSizeEqualToEndSize) ||
			( size >= 0 && size <= CC_MAX_PARTICLE_SIZE), "PointParticleSystem only supports 0 <= size <= 64");
		CCParticleSystem::setEndSize(size);
	}

}// namespace cocos2d