axmol/cocos2dx/particle_nodes/CCParticleSystemPoint.cpp

/****************************************************************************
Copyright (c) 2010-2011 cocos2d-x.org
Copyright (c) 2008-2010 Ricardo Quesada

http://www.cocos2d-x.org

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#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
}
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