axmol/cocos2dx/particle_nodes/CCQuadParticleSystem.cpp

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

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#include "CCQuadParticleSystem.h"
#include "CCSpriteFrame.h"
namespace cocos2d {

	//implementation CCQuadParticleSystem

	// overriding the init method
	bool CCQuadParticleSystem::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
			this->initTexCoordsWithRect(CGRectMake(0, 0, 1, 1));
			this->initIndices();

			// 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);	
			return true;
		}
		return false;
	}
	CCQuadParticleSystem::~CCQuadParticleSystem()
	{
		delete [] m_pQuads;
		delete [] m_pIndices;
		glDeleteBuffers(1, &m_uQuadsID);
	}

	// rect should be in Texture coordinates, not pixel coordinates
	void CCQuadParticleSystem::initTexCoordsWithRect(CGRect rect)
	{
		float bottomLeftX = rect.origin.x;
		float bottomLeftY = rect.origin.y;

		float bottomRightX = bottomLeftX + rect.size.width;
		float bottomRightY = bottomLeftY;

		float topLeftX = bottomLeftX;
		float topLeftY = bottomLeftY + rect.size.height;

		float topRightX = bottomRightX;
		float topRightY = topLeftY;

		// Important. Texture in cocos2d are inverted, so the Y component should be inverted
		CC_SWAP( topRightY, bottomRightY, float);
		CC_SWAP( topLeftY, bottomLeftY, float);

		for(int i=0; i<m_nTotalParticles; i++) 
		{
			// bottom-left vertex:
			m_pQuads[i].bl.texCoords.u = bottomLeftX;
			m_pQuads[i].bl.texCoords.v = bottomLeftY;
			// bottom-right vertex:
			m_pQuads[i].br.texCoords.u = bottomRightX;
			m_pQuads[i].br.texCoords.v = bottomRightY;
			// top-left vertex:
			m_pQuads[i].tl.texCoords.u = topLeftX;
			m_pQuads[i].tl.texCoords.v = topLeftY;
			// top-right vertex:
			m_pQuads[i].tr.texCoords.u = topRightX;
			m_pQuads[i].tr.texCoords.v = topRightY;
		}
	}
	void CCQuadParticleSystem::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);
		}

		// convert to Tex coords
		float wide = (float)texture->getPixelsWide();
		float high = (float)texture->getPixelsHigh();
		rect.origin.x = rect.origin.x / wide;
		rect.origin.y = rect.origin.y / high;
		rect.size.width = rect.size.width / wide;
		rect.size.height = rect.size.height / high;
		this->initTexCoordsWithRect(rect);
	}
	void CCQuadParticleSystem::setTexture(CCTexture2D* var)
	{
		this->setTextureWithRect(var, CGRectMake(0, 0, (float)var->getPixelsWide(), (float)var->getPixelsHigh()));
	}
	void CCQuadParticleSystem::setDisplayFrame(CCSpriteFrame *spriteFrame)
	{
		NSAssert( CGPoint::CGPointEqualToPoint( spriteFrame->getOffset() , 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 CCQuadParticleSystem::initIndices()
	{
		for( int i = 0; i < m_nTotalParticles; ++i)
		{
			m_pIndices[i*6+0] = i*4+0;
			m_pIndices[i*6+1] = i*4+1;
			m_pIndices[i*6+2] = i*4+2;

			m_pIndices[i*6+5] = i*4+1;
			m_pIndices[i*6+4] = i*4+2;
			m_pIndices[i*6+3] = i*4+3;
		}
	}
	void CCQuadParticleSystem::updateQuadWithParticle(tCCParticle* particle, CGPoint newPosition)
	{
		// colors
		m_pQuads[m_nParticleIdx].bl.colors = particle->color;
		m_pQuads[m_nParticleIdx].br.colors = particle->color;
		m_pQuads[m_nParticleIdx].tl.colors = particle->color;
		m_pQuads[m_nParticleIdx].tr.colors = particle->color;

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

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

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

			// bottom-left
			m_pQuads[m_nParticleIdx].bl.vertices.x = ax;
			m_pQuads[m_nParticleIdx].bl.vertices.y = ay;

			// bottom-right vertex:
			m_pQuads[m_nParticleIdx].br.vertices.x = bx;
			m_pQuads[m_nParticleIdx].br.vertices.y = by;

			// top-left vertex:
			m_pQuads[m_nParticleIdx].tl.vertices.x = dx;
			m_pQuads[m_nParticleIdx].tl.vertices.y = dy;

			// top-right vertex:
			m_pQuads[m_nParticleIdx].tr.vertices.x = cx;
			m_pQuads[m_nParticleIdx].tr.vertices.y = cy;
		} else {
			// bottom-left vertex:
			m_pQuads[m_nParticleIdx].bl.vertices.x = newPosition.x - size_2;
			m_pQuads[m_nParticleIdx].bl.vertices.y = newPosition.y - size_2;

			// bottom-right vertex:
			m_pQuads[m_nParticleIdx].br.vertices.x = newPosition.x + size_2;
			m_pQuads[m_nParticleIdx].br.vertices.y = newPosition.y - size_2;

			// top-left vertex:
			m_pQuads[m_nParticleIdx].tl.vertices.x = newPosition.x - size_2;
			m_pQuads[m_nParticleIdx].tl.vertices.y = newPosition.y + size_2;

			// top-right vertex:
			m_pQuads[m_nParticleIdx].tr.vertices.x = newPosition.x + size_2;
			m_pQuads[m_nParticleIdx].tr.vertices.y = newPosition.y + size_2;				
		}
	}
	void CCQuadParticleSystem::postStep()
	{
		glBindBuffer(GL_ARRAY_BUFFER, m_uQuadsID);
		glBufferSubData(GL_ARRAY_BUFFER, 0, sizeof(m_pQuads[0])*m_nParticleCount, m_pQuads);
		glBindBuffer(GL_ARRAY_BUFFER, 0);
	}
	
	// overriding draw method
	void CCQuadParticleSystem::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());

		glBindBuffer(GL_ARRAY_BUFFER, m_uQuadsID);

#define kPointSize sizeof(m_pQuads[0].bl)
		glVertexPointer(2,GL_FLOAT, kPointSize, 0);

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

		glTexCoordPointer(2, GL_FLOAT, kPointSize, (GLvoid*) offsetof(ccV2F_C4F_T2F,texCoords) );


		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

		if( m_nParticleIdx != m_nParticleCount ) 
		{
			CCLOG("pd:%d, pc:%d", m_nParticleIdx, m_nParticleCount);
		}
		glDrawElements(GL_TRIANGLES, m_nParticleIdx*6, GL_UNSIGNED_SHORT, m_pIndices);	

		// 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

		glBindBuffer(GL_ARRAY_BUFFER, 0);

		// restore GL default state
		// -
	}

}// namespace cocos2d