axmol/cocos2dx/misc_nodes/CCMotionStreak.cpp

/****************************************************************************
Copyright (c) 2010-2012 cocos2d-x.org
Copyright (c) 2011 ForzeField Studios S.L.

http://www.cocos2d-x.org

Permission is hereby granted, free of charge, to any person obtaining a copy
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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
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****************************************************************************/
#include "CCMotionStreak.h"
#include "textures/CCTextureCache.h"
#include "shaders/ccGLStateCache.h"
#include "shaders/CCGLProgram.h"
#include "shaders/CCShaderCache.h"
#include "ccMacros.h"

#include "support/CCVertex.h"
#include "support/CCPointExtension.h"

NS_CC_BEGIN

CCMotionStreak::CCMotionStreak()
: m_bFastMode(false)
, m_pTexture(NULL)
, m_tPositionR(CCPointZero)
, m_fStroke(0.0f)
, m_fFadeDelta(0.0f)
, m_fMinSeg(0.0f)
, m_uMaxPoints(0)
, m_uNuPoints(0)
, m_uPreviousNuPoints(0)
, m_pPointVertexes(NULL)
, m_pPointState(NULL)
, m_pVertices(NULL)
, m_pColorPointer(NULL)
, m_pTexCoords(NULL)
, m_bStartingPositionInitialized(false)
{
    m_tBlendFunc.src = GL_SRC_ALPHA;
    m_tBlendFunc.dst = GL_ONE_MINUS_SRC_ALPHA;
}

CCMotionStreak::~CCMotionStreak()
{
    CC_SAFE_RELEASE(m_pTexture);
    CC_SAFE_FREE(m_pPointState);
    CC_SAFE_FREE(m_pPointVertexes);
    CC_SAFE_FREE(m_pVertices);
    CC_SAFE_FREE(m_pColorPointer);
    CC_SAFE_FREE(m_pTexCoords);
}

CCMotionStreak* CCMotionStreak::create(float fade, float minSeg, float stroke, ccColor3B color, const char* path)
{
    CCMotionStreak *pRet = new CCMotionStreak();
    if (pRet && pRet->initWithFade(fade, minSeg, stroke, color, path))
    {
        pRet->autorelease();
        return pRet;
    }

    CC_SAFE_DELETE(pRet);
    return NULL;
}

CCMotionStreak* CCMotionStreak::create(float fade, float minSeg, float stroke, ccColor3B color, CCTexture2D* texture)
{
    CCMotionStreak *pRet = new CCMotionStreak();
    if (pRet && pRet->initWithFade(fade, minSeg, stroke, color, texture))
    {
        pRet->autorelease();
        return pRet;
    }

    CC_SAFE_DELETE(pRet);
    return NULL;
}

bool CCMotionStreak::initWithFade(float fade, float minSeg, float stroke, ccColor3B color, const char* path)
{
    CCAssert(path != NULL, "Invalid filename");

    CCTexture2D *texture = CCTextureCache::sharedTextureCache()->addImage(path);
    return initWithFade(fade, minSeg, stroke, color, texture);
}

bool CCMotionStreak::initWithFade(float fade, float minSeg, float stroke, ccColor3B color, CCTexture2D* texture)
{
    CCNode::setPosition(CCPointZero);
    setAnchorPoint(CCPointZero);
    ignoreAnchorPointForPosition(true);
    m_bStartingPositionInitialized = false;

    m_tPositionR = CCPointZero;
    m_bFastMode = true;
    m_fMinSeg = (minSeg == -1.0f) ? stroke/5.0f : minSeg;
    m_fMinSeg *= m_fMinSeg;

    m_fStroke = stroke;
    m_fFadeDelta = 1.0f/fade;

    m_uMaxPoints = (int)(fade*60.0f)+2;
    m_uNuPoints = 0;
    m_pPointState = (float *)malloc(sizeof(float) * m_uMaxPoints);
    m_pPointVertexes = (CCPoint*)malloc(sizeof(CCPoint) * m_uMaxPoints);

    m_pVertices = (ccVertex2F*)malloc(sizeof(ccVertex2F) * m_uMaxPoints * 2);
    m_pTexCoords = (ccTex2F*)malloc(sizeof(ccTex2F) * m_uMaxPoints * 2);
    m_pColorPointer =  (GLubyte*)malloc(sizeof(GLubyte) * m_uMaxPoints * 2 * 4);

    // Set blend mode
    m_tBlendFunc.src = GL_SRC_ALPHA;
    m_tBlendFunc.dst = GL_ONE_MINUS_SRC_ALPHA;

    // shader program
    setShaderProgram(CCShaderCache::sharedShaderCache()->programForKey(kCCShader_PositionTextureColor));

    setTexture(texture);
    setColor(color);
    scheduleUpdate();

    return true;
}

void CCMotionStreak::setPosition(const CCPoint& position)
{
    m_bStartingPositionInitialized = true;
    m_tPositionR = position;
}

void CCMotionStreak::tintWithColor(ccColor3B colors)
{
    setColor(colors);

    // Fast assignation
    for(unsigned int i = 0; i<m_uNuPoints*2; i++) 
    {
        *((ccColor3B*) (m_pColorPointer+i*4)) = colors;
    }
}

CCTexture2D* CCMotionStreak::getTexture(void)
{
    return m_pTexture;
}

void CCMotionStreak::setTexture(CCTexture2D *texture)
{
    if (m_pTexture != texture)
    {
        CC_SAFE_RETAIN(texture);
        CC_SAFE_RELEASE(m_pTexture);
        m_pTexture = texture;
    }
}

void CCMotionStreak::setBlendFunc(ccBlendFunc blendFunc)
{
    m_tBlendFunc = blendFunc;
}

ccBlendFunc CCMotionStreak::getBlendFunc(void)
{
    return m_tBlendFunc;
}

void CCMotionStreak::setOpacity(GLubyte opacity)
{
    CCAssert(false, "Set opacity no supported");
}

GLubyte CCMotionStreak::getOpacity(void)
{
    CCAssert(false, "Opacity no supported");
    return 0;
}

void CCMotionStreak::setOpacityModifyRGB(bool bValue)
{
    CC_UNUSED_PARAM(bValue);
}

bool CCMotionStreak::isOpacityModifyRGB(void)
{
    return false;
}

void CCMotionStreak::update(float delta)
{
    if (!m_bStartingPositionInitialized)
    {
        return;
    }
    
    delta *= m_fFadeDelta;

    unsigned int newIdx, newIdx2, i, i2;
    unsigned int mov = 0;

    // Update current points
    for(i = 0; i<m_uNuPoints; i++)
    {
        m_pPointState[i]-=delta;

        if(m_pPointState[i] <= 0)
            mov++;
        else
        {
            newIdx = i-mov;

            if(mov>0)
            {
                // Move data
                m_pPointState[newIdx] = m_pPointState[i];

                // Move point
                m_pPointVertexes[newIdx] = m_pPointVertexes[i];

                // Move vertices
                i2 = i*2;
                newIdx2 = newIdx*2;
                m_pVertices[newIdx2] = m_pVertices[i2];
                m_pVertices[newIdx2+1] = m_pVertices[i2+1];

                // Move color
                i2 *= 4;
                newIdx2 *= 4;
                m_pColorPointer[newIdx2+0] = m_pColorPointer[i2+0];
                m_pColorPointer[newIdx2+1] = m_pColorPointer[i2+1];
                m_pColorPointer[newIdx2+2] = m_pColorPointer[i2+2];
                m_pColorPointer[newIdx2+4] = m_pColorPointer[i2+4];
                m_pColorPointer[newIdx2+5] = m_pColorPointer[i2+5];
                m_pColorPointer[newIdx2+6] = m_pColorPointer[i2+6];
            }else
                newIdx2 = newIdx*8;

            const GLubyte op = (GLubyte)(m_pPointState[newIdx] * 255.0f);
            m_pColorPointer[newIdx2+3] = op;
            m_pColorPointer[newIdx2+7] = op;
        }
    }
    m_uNuPoints-=mov;

    // Append new point
    bool appendNewPoint = true;
    if(m_uNuPoints >= m_uMaxPoints)
    {
        appendNewPoint = false;
    }

    else if(m_uNuPoints>0)
    {
        bool a1 = ccpDistanceSQ(m_pPointVertexes[m_uNuPoints-1], m_tPositionR) < m_fMinSeg;
        bool a2 = (m_uNuPoints == 1) ? false : (ccpDistanceSQ(m_pPointVertexes[m_uNuPoints-2], m_tPositionR) < (m_fMinSeg * 2.0f));
        if(a1 || a2)
        {
            appendNewPoint = false;
        }
    }

    if(appendNewPoint)
    {
        m_pPointVertexes[m_uNuPoints] = m_tPositionR;
        m_pPointState[m_uNuPoints] = 1.0f;

        // Color assignment
        const unsigned int offset = m_uNuPoints*8;
        *((ccColor3B*)(m_pColorPointer + offset)) = _displayedColor;
        *((ccColor3B*)(m_pColorPointer + offset+4)) = _displayedColor;

        // Opacity
        m_pColorPointer[offset+3] = 255;
        m_pColorPointer[offset+7] = 255;

        // Generate polygon
        if(m_uNuPoints > 0 && m_bFastMode )
        {
            if(m_uNuPoints > 1)
            {
                ccVertexLineToPolygon(m_pPointVertexes, m_fStroke, m_pVertices, m_uNuPoints, 1);
            }
            else
            {
                ccVertexLineToPolygon(m_pPointVertexes, m_fStroke, m_pVertices, 0, 2);
            }
        }

        m_uNuPoints ++;
    }

    if( ! m_bFastMode )
    {
        ccVertexLineToPolygon(m_pPointVertexes, m_fStroke, m_pVertices, 0, m_uNuPoints);
    }

    // Updated Tex Coords only if they are different than previous step
    if( m_uNuPoints  && m_uPreviousNuPoints != m_uNuPoints ) {
        float texDelta = 1.0f / m_uNuPoints;
        for( i=0; i < m_uNuPoints; i++ ) {
            m_pTexCoords[i*2] = tex2(0, texDelta*i);
            m_pTexCoords[i*2+1] = tex2(1, texDelta*i);
        }

        m_uPreviousNuPoints = m_uNuPoints;
    }
}

void CCMotionStreak::reset()
{
    m_uNuPoints = 0;
}

void CCMotionStreak::draw()
{
    if(m_uNuPoints <= 1)
        return;

    CC_NODE_DRAW_SETUP();

    ccGLEnableVertexAttribs(kCCVertexAttribFlag_PosColorTex );
    ccGLBlendFunc( m_tBlendFunc.src, m_tBlendFunc.dst );

    ccGLBindTexture2D( m_pTexture->getName() );

    glVertexAttribPointer(kCCVertexAttrib_Position, 2, GL_FLOAT, GL_FALSE, 0, m_pVertices);
    glVertexAttribPointer(kCCVertexAttrib_TexCoords, 2, GL_FLOAT, GL_FALSE, 0, m_pTexCoords);
    glVertexAttribPointer(kCCVertexAttrib_Color, 4, GL_UNSIGNED_BYTE, GL_TRUE, 0, m_pColorPointer);

    glDrawArrays(GL_TRIANGLE_STRIP, 0, (GLsizei)m_uNuPoints*2);

    CC_INCREMENT_GL_DRAWS(1);
}

NS_CC_END