CCParticleSystemQuad.cpp

/****************************************************************************
Copyright (c) 2010-2012 cocos2d-x.org
Copyright (c) 2008-2010 Ricardo Quesada
Copyright (c) 2009      Leonardo Kasperavičius
Copyright (c) 2011      Zynga Inc.

http://www.cocos2d-x.org
 
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all copies or substantial portions of the Software.

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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
****************************************************************************/

#include "CCGL.h"
#include "CCParticleSystemQuad.h"
#include "sprite_nodes/CCSpriteFrame.h"
#include "CCDirector.h"
#include "CCParticleBatchNode.h"
#include "textures/CCTextureAtlas.h"
#include "shaders/CCShaderCache.h"
#include "shaders/ccGLStateCache.h"
#include "shaders/CCGLProgram.h"
#include "support/TransformUtils.h"
#include "support/CCNotificationCenter.h"
#include "CCEventType.h"

// extern
#include "kazmath/GL/matrix.h"

NS_CC_BEGIN

//implementation CCParticleSystemQuad
// overriding the init method
bool CCParticleSystemQuad::initWithTotalParticles(unsigned int numberOfParticles)
{
    // base initialization
    if( CCParticleSystem::initWithTotalParticles(numberOfParticles) ) 
    {
        // allocating data space
        if( ! this->allocMemory() ) {
            this->release();
            return false;
        }

        setupIndices();
#if CC_TEXTURE_ATLAS_USE_VAO
        setupVBOandVAO();
#else
        setupVBO();
#endif

        setShaderProgram(CCShaderCache::sharedShaderCache()->programForKey(kCCShader_PositionTextureColor));
        
        
        // Need to listen the event only when not use batchnode, because it will use VBO
        CCNotificationCenter::sharedNotificationCenter()->addObserver(this,
                                                                      callfuncO_selector(CCParticleSystemQuad::listenBackToForeground),
                                                                      EVNET_COME_TO_FOREGROUND,
                                                                      NULL);
        
        return true;
    }
    return false;
}

CCParticleSystemQuad::CCParticleSystemQuad()
:m_pQuads(NULL)
,m_pIndices(NULL)
#if CC_TEXTURE_ATLAS_USE_VAO
,m_uVAOname(0)
#endif
{
    memset(m_pBuffersVBO, 0, sizeof(m_pBuffersVBO));
}

CCParticleSystemQuad::~CCParticleSystemQuad()
{
    if (NULL == m_pBatchNode)
    {
        CC_SAFE_FREE(m_pQuads);
        CC_SAFE_FREE(m_pIndices);
        glDeleteBuffers(2, &m_pBuffersVBO[0]);
#if CC_TEXTURE_ATLAS_USE_VAO
        glDeleteVertexArrays(1, &m_uVAOname);
#endif
    }
    
    CCNotificationCenter::sharedNotificationCenter()->removeObserver(this, EVNET_COME_TO_FOREGROUND);
}

// implementation CCParticleSystemQuad
CCParticleSystemQuad * CCParticleSystemQuad::particleWithFile(const char *plistFile)
{
    return CCParticleSystemQuad::create(plistFile);
}

CCParticleSystemQuad * CCParticleSystemQuad::create(const char *plistFile)
{
    CCParticleSystemQuad *pRet = new CCParticleSystemQuad();
    if (pRet && pRet->initWithFile(plistFile))
    {
        pRet->autorelease();
        return pRet;
    }
    CC_SAFE_DELETE(pRet);
    return pRet;
}

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

    CCRect rect = CCRectMake(
        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);

    ccV3F_C4B_T2F_Quad *quads = NULL;
    unsigned int start = 0, end = 0;
    if (m_pBatchNode)
    {
        quads = m_pBatchNode->getTextureAtlas()->getQuads();
        start = m_uAtlasIndex;
        end = m_uAtlasIndex + m_uTotalParticles;
    }
    else
    {
        quads = m_pQuads;
        start = 0;
        end = m_uTotalParticles;
    }

    for(unsigned int i=start; i<end; i++) 
    {
        // bottom-left vertex:
        quads[i].bl.texCoords.u = left;
        quads[i].bl.texCoords.v = bottom;
        // bottom-right vertex:
        quads[i].br.texCoords.u = right;
        quads[i].br.texCoords.v = bottom;
        // top-left vertex:
        quads[i].tl.texCoords.u = left;
        quads[i].tl.texCoords.v = top;
        // top-right vertex:
        quads[i].tr.texCoords.u = right;
        quads[i].tr.texCoords.v = top;
    }
}
void CCParticleSystemQuad::setTextureWithRect(CCTexture2D *texture, const CCRect& 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* texture)
{
    const CCSize& s = texture->getContentSize();
    this->setTextureWithRect(texture, CCRectMake(0, 0, s.width, s.height));
}
void CCParticleSystemQuad::setDisplayFrame(CCSpriteFrame *spriteFrame)
{
    CCAssert( CCPoint::CCPointEqualToPoint( spriteFrame->getOffsetInPixels() , CCPointZero ), "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::setupIndices()
{
    for(unsigned int i = 0; i < m_uTotalParticles; ++i)
    {
        const unsigned int i6 = i*6;
        const unsigned 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, const CCPoint& newPosition)
{
    ccV3F_C4B_T2F_Quad *quad;

    if (m_pBatchNode)
    {
        ccV3F_C4B_T2F_Quad *batchQuads = m_pBatchNode->getTextureAtlas()->getQuads();
        quad = &(batchQuads[m_uAtlasIndex+particle->atlasIndex]);
    }
    else
    {
        quad = &(m_pQuads[m_uParticleIdx]);
    }
    ccColor4B color = (m_bOpacityModifyRGB)
        ? ccc4( particle->color.r*particle->color.a*255, particle->color.g*particle->color.a*255, particle->color.b*particle->color.a*255, particle->color.a*255)
        : ccc4( particle->color.r*255, particle->color.g*255, particle->color.b*255, particle->color.a*255);

    quad->bl.colors = color;
    quad->br.colors = color;
    quad->tl.colors = color;
    quad->tr.colors = 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()
{
    glBindBuffer(GL_ARRAY_BUFFER, m_pBuffersVBO[0] );
    glBufferSubData(GL_ARRAY_BUFFER, 0, sizeof(m_pQuads[0])*m_uParticleCount, m_pQuads);
    glBindBuffer(GL_ARRAY_BUFFER, 0);

    CHECK_GL_ERROR_DEBUG();
}

// overriding draw method
void CCParticleSystemQuad::draw()
{    
    CCAssert(!m_pBatchNode,"draw should not be called when added to a particleBatchNode");

    CC_NODE_DRAW_SETUP();

    ccGLBindTexture2D( m_pTexture->getName() );
    ccGLBlendFunc( m_tBlendFunc.src, m_tBlendFunc.dst );

    CCAssert( m_uParticleIdx == m_uParticleCount, "Abnormal error in particle quad");

#if CC_TEXTURE_ATLAS_USE_VAO
    //
    // Using VBO and VAO
    //
    glBindVertexArray( m_uVAOname );

#if CC_REBIND_INDICES_BUFFER
    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_pBuffersVBO[1]);
#endif

    glDrawElements(GL_TRIANGLES, (GLsizei) m_uParticleIdx*6, GL_UNSIGNED_SHORT, 0);

#if CC_REBIND_INDICES_BUFFER
    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
#endif

    glBindVertexArray( 0 );

#else
    //
    // Using VBO without VAO
    //

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

    ccGLEnableVertexAttribs( kCCVertexAttribFlag_PosColorTex );

    glBindBuffer(GL_ARRAY_BUFFER, m_pBuffersVBO[0]);
    // vertices
    glVertexAttribPointer(kCCVertexAttrib_Position, 3, GL_FLOAT, GL_FALSE, kQuadSize, (GLvoid*) offsetof( ccV3F_C4B_T2F, vertices));
    // colors
    glVertexAttribPointer(kCCVertexAttrib_Color, 4, GL_UNSIGNED_BYTE, GL_TRUE, kQuadSize, (GLvoid*) offsetof( ccV3F_C4B_T2F, colors));
    // tex coords
    glVertexAttribPointer(kCCVertexAttrib_TexCoords, 2, GL_FLOAT, GL_FALSE, kQuadSize, (GLvoid*) offsetof( ccV3F_C4B_T2F, texCoords));
    
    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_pBuffersVBO[1]);

    glDrawElements(GL_TRIANGLES, (GLsizei) m_uParticleIdx*6, GL_UNSIGNED_SHORT, 0);

    glBindBuffer(GL_ARRAY_BUFFER, 0);
    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);

#endif

    CC_INCREMENT_GL_DRAWS(1);
    CHECK_GL_ERROR_DEBUG();
}

void CCParticleSystemQuad::setTotalParticles(unsigned int tp)
{
    // If we are setting the total numer of particles to a number higher
    // than what is allocated, we need to allocate new arrays
    if( tp > m_uAllocatedParticles )
    {
        // Allocate new memory
        size_t particlesSize = tp * sizeof(tCCParticle);
        size_t quadsSize = sizeof(m_pQuads[0]) * tp * 1;
        size_t indicesSize = sizeof(m_pIndices[0]) * tp * 6 * 1;

        tCCParticle* particlesNew = (tCCParticle*)realloc(m_pParticles, particlesSize);
        ccV3F_C4B_T2F_Quad* quadsNew = (ccV3F_C4B_T2F_Quad*)realloc(m_pQuads, quadsSize);
        GLushort* indicesNew = (GLushort*)realloc(m_pIndices, indicesSize);

        if (particlesNew && quadsNew && indicesNew)
        {
            // Assign pointers
            m_pParticles = particlesNew;
            m_pQuads = quadsNew;
            m_pIndices = indicesNew;

            // Clear the memory
            memset(m_pParticles, 0, particlesSize);
            memset(m_pQuads, 0, quadsSize);
            memset(m_pIndices, 0, indicesSize);

            m_uAllocatedParticles = tp;
        }
        else
        {
            // Out of memory, failed to resize some array
            if (particlesNew) m_pParticles = particlesNew;
            if (quadsNew) m_pQuads = quadsNew;
            if (indicesNew) m_pIndices = indicesNew;

            CCLOG("Particle system: out of memory");
            return;
        }

        m_uTotalParticles = tp;

        // Init particles
        if (m_pBatchNode)
        {
            for (unsigned int i = 0; i < m_uTotalParticles; i++)
            {
                m_pParticles[i].atlasIndex=i;
            }
        }

        setupIndices();
#if CC_TEXTURE_ATLAS_USE_VAO
        setupVBOandVAO();
#else
        setupVBO();
#endif
    }
    else
    {
        m_uTotalParticles = tp;
    }
}

#if CC_TEXTURE_ATLAS_USE_VAO
void CCParticleSystemQuad::setupVBOandVAO()
{
    glGenVertexArrays(1, &m_uVAOname);
    glBindVertexArray(m_uVAOname);

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

    glGenBuffers(2, &m_pBuffersVBO[0]);

    glBindBuffer(GL_ARRAY_BUFFER, m_pBuffersVBO[0]);
    glBufferData(GL_ARRAY_BUFFER, sizeof(m_pQuads[0]) * m_uTotalParticles, m_pQuads, GL_DYNAMIC_DRAW);

    // vertices
    glEnableVertexAttribArray(kCCVertexAttrib_Position);
    glVertexAttribPointer(kCCVertexAttrib_Position, 2, GL_FLOAT, GL_FALSE, kQuadSize, (GLvoid*) offsetof( ccV3F_C4B_T2F, vertices));

    // colors
    glEnableVertexAttribArray(kCCVertexAttrib_Color);
    glVertexAttribPointer(kCCVertexAttrib_Color, 4, GL_UNSIGNED_BYTE, GL_TRUE, kQuadSize, (GLvoid*) offsetof( ccV3F_C4B_T2F, colors));

    // tex coords
    glEnableVertexAttribArray(kCCVertexAttrib_TexCoords);
    glVertexAttribPointer(kCCVertexAttrib_TexCoords, 2, GL_FLOAT, GL_FALSE, kQuadSize, (GLvoid*) offsetof( ccV3F_C4B_T2F, texCoords));

    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_pBuffersVBO[1]);
    glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(m_pIndices[0]) * m_uTotalParticles * 6, m_pIndices, GL_STATIC_DRAW);

    glBindVertexArray(0);
    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
    glBindBuffer(GL_ARRAY_BUFFER, 0);

    CHECK_GL_ERROR_DEBUG();
}
#else

void CCParticleSystemQuad::setupVBO()
{
    glGenBuffers(2, &m_pBuffersVBO[0]);

    glBindBuffer(GL_ARRAY_BUFFER, m_pBuffersVBO[0]);
    glBufferData(GL_ARRAY_BUFFER, sizeof(m_pQuads[0]) * m_uTotalParticles, m_pQuads, GL_DYNAMIC_DRAW);
    glBindBuffer(GL_ARRAY_BUFFER, 0);

    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_pBuffersVBO[1]);
    glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(m_pIndices[0]) * m_uTotalParticles * 6, m_pIndices, GL_STATIC_DRAW);
    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);

    CHECK_GL_ERROR_DEBUG();
}

#endif

void CCParticleSystemQuad::listenBackToForeground(CCObject *obj)
{
#if CC_TEXTURE_ATLAS_USE_VAO
        setupVBOandVAO();
#else
        setupVBO();
#endif
}

bool CCParticleSystemQuad::allocMemory()
{
    CCAssert( ( !m_pQuads && !m_pIndices), "Memory already alloced");
    CCAssert( !m_pBatchNode, "Memory should not be alloced when not using batchNode");

    CC_SAFE_FREE(m_pQuads);
    CC_SAFE_FREE(m_pIndices);

    m_pQuads = (ccV3F_C4B_T2F_Quad*)malloc(m_uTotalParticles * sizeof(ccV3F_C4B_T2F_Quad));
    m_pIndices = (GLushort*)malloc(m_uTotalParticles * 6 * sizeof(GLushort));
    
    if( !m_pQuads || !m_pIndices) 
    {
        CCLOG("cocos2d: Particle system: not enough memory");
        CC_SAFE_FREE(m_pQuads);
        CC_SAFE_FREE(m_pIndices);

        return false;
    }

    memset(m_pQuads, 0, m_uTotalParticles * sizeof(ccV3F_C4B_T2F_Quad));
    memset(m_pIndices, 0, m_uTotalParticles * 6 * sizeof(GLushort));

    return true;
}

void CCParticleSystemQuad::setBatchNode(CCParticleBatchNode * batchNode)
{
    if( m_pBatchNode != batchNode ) 
    {
        CCParticleBatchNode* oldBatch = m_pBatchNode;

        CCParticleSystem::setBatchNode(batchNode);

        // NEW: is self render ?
        if( ! batchNode ) 
        {
            allocMemory();
            setupIndices();
            setTexture(oldBatch->getTexture());
#if CC_TEXTURE_ATLAS_USE_VAO
            setupVBOandVAO();
#else
            setupVBO();
#endif
        }
        // OLD: was it self render ? cleanup
        else if( !oldBatch )
        {
            // copy current state to batch
            ccV3F_C4B_T2F_Quad *batchQuads = m_pBatchNode->getTextureAtlas()->getQuads();
            ccV3F_C4B_T2F_Quad *quad = &(batchQuads[m_uAtlasIndex] );
            memcpy( quad, m_pQuads, m_uTotalParticles * sizeof(m_pQuads[0]) );

            CC_SAFE_FREE(m_pQuads);
            CC_SAFE_FREE(m_pIndices);

            glDeleteBuffers(2, &m_pBuffersVBO[0]);
#if CC_TEXTURE_ATLAS_USE_VAO
            glDeleteVertexArrays(1, &m_uVAOname);
#endif
        }
    }
}

CCParticleSystemQuad * CCParticleSystemQuad::node()
{
    return CCParticleSystemQuad::create();
}

CCParticleSystemQuad * CCParticleSystemQuad::create() {
    CCParticleSystemQuad *pParticleSystemQuad = new CCParticleSystemQuad();
    if (pParticleSystemQuad && pParticleSystemQuad->init())
    {
        pParticleSystemQuad->autorelease();
        return pParticleSystemQuad;
    }
    CC_SAFE_DELETE(pParticleSystemQuad);
    return NULL;
}

NS_CC_END