axmol/cocos2dx/particle_nodes/CCParticleSystemQuad.cpp

/****************************************************************************
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#include "platform/CCGL.h"

#include "CCParticleSystemQuad.h"
#include "CCSpriteFrame.h"

namespace cocos2d {

//implementation CCParticleSystemQuad

// overriding the init method
bool CCParticleSystemQuad::initWithTotalParticles(int numberOfParticles)
{
	// base initialization
	if( CCParticleSystem::initWithTotalParticles(numberOfParticles) ) 
	{
		// allocating data space
		m_pQuads = new ccV2F_C4F_T2F_Quad[m_nTotalParticles];
		m_pIndices = new GLushort[m_nTotalParticles * 6];

		if( !m_pQuads || !m_pIndices) 
		{
			CCLOG("cocos2d: Particle system: not enough memory");
			if( m_pQuads )
				delete [] m_pQuads;
			if(m_pIndices)
				delete [] m_pIndices;
			this->release();
			return NULL;
		}

		// initialize only once the texCoords and the indices
        if (m_pTexture)
        {
            this->initTexCoordsWithRect(CGRectMake((float)0, (float)0, (float)m_pTexture->getPixelsWide(), (float)m_pTexture->getPixelsHigh()));
        }
        else
        {
            this->initTexCoordsWithRect(CGRectMake((float)0, (float)0, (float)1, (float)1));
        }

		this->initIndices();

#if CC_USES_VBO
		// create the VBO buffer
		glGenBuffers(1, &m_uQuadsID);

		// initial binding
		glBindBuffer(GL_ARRAY_BUFFER, m_uQuadsID);
		glBufferData(GL_ARRAY_BUFFER, sizeof(m_pQuads[0])*m_nTotalParticles, m_pQuads, GL_DYNAMIC_DRAW);	
		glBindBuffer(GL_ARRAY_BUFFER, 0);	
#endif
		return true;
	}
	return false;
}
CCParticleSystemQuad::~CCParticleSystemQuad()
{
	CCX_SAFE_DELETE_ARRAY(m_pQuads);
	CCX_SAFE_DELETE_ARRAY(m_pIndices);
#if CC_USES_VBO
    glDeleteBuffers(1, &m_uQuadsID);
#endif
}

// rect should be in Texture coordinates, not pixel coordinates
void CCParticleSystemQuad::initTexCoordsWithRect(CGRect pointRect)
{
    // convert to Tex coords

    CGRect rect = CGRectMake(
        pointRect.origin.x * CC_CONTENT_SCALE_FACTOR(),
        pointRect.origin.y * CC_CONTENT_SCALE_FACTOR(),
        pointRect.size.width * CC_CONTENT_SCALE_FACTOR(),
        pointRect.size.height * CC_CONTENT_SCALE_FACTOR());

    GLfloat wide = (GLfloat) pointRect.size.width;
    GLfloat high = (GLfloat) pointRect.size.height;

    if (m_pTexture)
    {
        wide = (GLfloat)m_pTexture->getPixelsWide();
        high = (GLfloat)m_pTexture->getPixelsHigh();
    }

#if CC_FIX_ARTIFACTS_BY_STRECHING_TEXEL
    GLfloat left = (rect.origin.x*2+1) / (wide*2);
    GLfloat bottom = (rect.origin.y*2+1) / (high*2);
    GLfloat right = left + (rect.size.width*2-2) / (wide*2);
    GLfloat top = bottom + (rect.size.height*2-2) / (high*2);
#else
    GLfloat left = rect.origin.x / wide;
    GLfloat bottom = rect.origin.y / high;
    GLfloat right = left + rect.size.width / wide;
    GLfloat top = bottom + rect.size.height / high;
#endif // ! CC_FIX_ARTIFACTS_BY_STRECHING_TEXEL

	// Important. Texture in cocos2d are inverted, so the Y component should be inverted
	CC_SWAP( top, bottom, float);

	for(int i=0; i<m_nTotalParticles; i++) 
	{
		// bottom-left vertex:
		m_pQuads[i].bl.texCoords.u = left;
		m_pQuads[i].bl.texCoords.v = bottom;
		// bottom-right vertex:
		m_pQuads[i].br.texCoords.u = right;
		m_pQuads[i].br.texCoords.v = bottom;
		// top-left vertex:
		m_pQuads[i].tl.texCoords.u = left;
		m_pQuads[i].tl.texCoords.v = top;
		// top-right vertex:
		m_pQuads[i].tr.texCoords.u = right;
		m_pQuads[i].tr.texCoords.v = top;
	}
}
void CCParticleSystemQuad::setTextureWithRect(CCTexture2D *texture, CGRect rect)
{
	// Only update the texture if is different from the current one
	if( !m_pTexture || texture->getName() != m_pTexture->getName() )
	{
		CCParticleSystem::setTexture(texture);
	}

	this->initTexCoordsWithRect(rect);
}
void CCParticleSystemQuad::setTexture(CCTexture2D* var)
{
	this->setTextureWithRect(var, CGRectMake(0, 0, 
        (float)(var->getPixelsWide() / CC_CONTENT_SCALE_FACTOR()), 
        (float)(var->getPixelsHigh() / CC_CONTENT_SCALE_FACTOR())));
}
void CCParticleSystemQuad::setDisplayFrame(CCSpriteFrame *spriteFrame)
{
	NSAssert( CGPoint::CGPointEqualToPoint( spriteFrame->getOffsetInPixels() , CGPointZero ), "QuadParticle only supports SpriteFrames with no offsets");

	// update texture before updating texture rect
	if ( !m_pTexture || spriteFrame->getTexture()->getName() != m_pTexture->getName())
	{
		this->setTexture(spriteFrame->getTexture());
	}
}
void CCParticleSystemQuad::initIndices()
{
	for( int i = 0; i < m_nTotalParticles; ++i)
	{
        const int i6 = i*6;
        const int i4 = i*4;
		m_pIndices[i6+0] = (GLushort) i4+0;
		m_pIndices[i6+1] = (GLushort) i4+1;
		m_pIndices[i6+2] = (GLushort) i4+2;

		m_pIndices[i6+5] = (GLushort) i4+1;
		m_pIndices[i6+4] = (GLushort) i4+2;
		m_pIndices[i6+3] = (GLushort) i4+3;
	}
}
void CCParticleSystemQuad::updateQuadWithParticle(tCCParticle* particle, CGPoint newPosition)
{
	// colors
    ccV2F_C4F_T2F_Quad *quad = &(m_pQuads[m_nParticleIdx]);
	quad->bl.colors = particle->color;
	quad->br.colors = particle->color;
	quad->tl.colors = particle->color;
	quad->tr.colors = particle->color;

	// vertices
	GLfloat size_2 = particle->size/2;
	if( particle->rotation ) 
	{
		GLfloat x1 = -size_2;
		GLfloat y1 = -size_2;

		GLfloat x2 = size_2;
		GLfloat y2 = size_2;
		GLfloat x = newPosition.x;
		GLfloat y = newPosition.y;

		GLfloat r = (GLfloat)-CC_DEGREES_TO_RADIANS(particle->rotation);
		GLfloat cr = cosf(r);
		GLfloat sr = sinf(r);
		GLfloat ax = x1 * cr - y1 * sr + x;
		GLfloat ay = x1 * sr + y1 * cr + y;
		GLfloat bx = x2 * cr - y1 * sr + x;
		GLfloat by = x2 * sr + y1 * cr + y;
		GLfloat cx = x2 * cr - y2 * sr + x;
		GLfloat cy = x2 * sr + y2 * cr + y;
		GLfloat dx = x1 * cr - y2 * sr + x;
		GLfloat dy = x1 * sr + y2 * cr + y;

		// bottom-left
		quad->bl.vertices.x = ax;
		quad->bl.vertices.y = ay;

		// bottom-right vertex:
		quad->br.vertices.x = bx;
		quad->br.vertices.y = by;

		// top-left vertex:
		quad->tl.vertices.x = dx;
		quad->tl.vertices.y = dy;

		// top-right vertex:
		quad->tr.vertices.x = cx;
		quad->tr.vertices.y = cy;
	} else {
		// bottom-left vertex:
		quad->bl.vertices.x = newPosition.x - size_2;
		quad->bl.vertices.y = newPosition.y - size_2;

		// bottom-right vertex:
		quad->br.vertices.x = newPosition.x + size_2;
		quad->br.vertices.y = newPosition.y - size_2;

		// top-left vertex:
		quad->tl.vertices.x = newPosition.x - size_2;
		quad->tl.vertices.y = newPosition.y + size_2;

		// top-right vertex:
		quad->tr.vertices.x = newPosition.x + size_2;
		quad->tr.vertices.y = newPosition.y + size_2;				
	}
}
void CCParticleSystemQuad::postStep()
{
#if CC_USES_VBO
	glBindBuffer(GL_ARRAY_BUFFER, m_uQuadsID);
	glBufferSubData(GL_ARRAY_BUFFER, 0, sizeof(m_pQuads[0])*m_nParticleCount, m_pQuads);
	glBindBuffer(GL_ARRAY_BUFFER, 0);
#endif
}

// overriding draw method
void CCParticleSystemQuad::draw()
{	
	// 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, GL_TEXTURE_COORD_ARRAY
	// Unneeded states: -
	glBindTexture(GL_TEXTURE_2D, m_pTexture->getName());

#define kQuadSize sizeof(m_pQuads[0].bl)

#if CC_USES_VBO
    glBindBuffer(GL_ARRAY_BUFFER, m_uQuadsID);

	glVertexPointer(2,GL_FLOAT, kQuadSize, 0);

	glColorPointer(4, GL_FLOAT, kQuadSize, (GLvoid*) offsetof(ccV2F_C4F_T2F,colors) );

	glTexCoordPointer(2, GL_FLOAT, kQuadSize, (GLvoid*) offsetof(ccV2F_C4F_T2F,texCoords) );
#else   // vertex array list

    int offset = (int) m_pQuads;

    // vertex
    int diff = offsetof( ccV2F_C4F_T2F, vertices);
    glVertexPointer(2,GL_FLOAT, kQuadSize, (GLvoid*) (offset+diff) );

    // color
    diff = offsetof( ccV2F_C4F_T2F, colors);
    glColorPointer(4, GL_FLOAT, kQuadSize, (GLvoid*)(offset + diff));

    // tex coords
    diff = offsetof( ccV2F_C4F_T2F, texCoords);
    glTexCoordPointer(2, GL_FLOAT, kQuadSize, (GLvoid*)(offset + diff));		

#endif // ! CC_USES_VBO

    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 );
	}

    NSAssert( m_nParticleIdx == m_nParticleCount, "Abnormal error in particle quad");

	glDrawElements(GL_TRIANGLES, m_nParticleIdx*6, GL_UNSIGNED_SHORT, m_pIndices);	

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

#if CC_USES_VBO
	glBindBuffer(GL_ARRAY_BUFFER, 0);
#endif

	// restore GL default state
	// -
}

}// namespace cocos2d