ios/cocos2d/cocos/2d/CCMotionStreak.cpp

/****************************************************************************
Copyright (c) 2011      ForzeField Studios S.L.
Copyright (c) 2010-2012 cocos2d-x.org
Copyright (c) 2013-2016 Chukong Technologies Inc.
Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.
http://www.cocos2d-x.org
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of this software and associated documentation files (the "Software"), to deal
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all copies or substantial portions of the Software.
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****************************************************************************/
#include "2d/CCMotionStreak.h"
#include "math/CCVertex.h"
#include "base/CCDirector.h"
#include "base/ccUtils.h"
#include "renderer/CCTextureCache.h"
#include "renderer/CCTexture2D.h"
#include "renderer/CCRenderer.h"
#include "renderer/ccShaders.h"
#include "renderer/backend/ProgramState.h"
NS_CC_BEGIN
MotionStreak::MotionStreak()
{
    _customCommand.setDrawType(CustomCommand::DrawType::ARRAY);
    _customCommand.setPrimitiveType(CustomCommand::PrimitiveType::TRIANGLE_STRIP);
    auto& pipelineDescriptor = _customCommand.getPipelineDescriptor();
    auto* program = backend::Program::getBuiltinProgram(backend::ProgramType::POSITION_TEXTURE_COLOR);
    _programState = new (std::nothrow) backend::ProgramState(program);
    pipelineDescriptor.programState = _programState;
    _mvpMatrixLocaiton = pipelineDescriptor.programState->getUniformLocation("u_MVPMatrix");
    _textureLocation = pipelineDescriptor.programState->getUniformLocation("u_texture");
    
    auto vertexLayout = _programState->getVertexLayout();
    const auto& attributeInfo = _programState->getProgram()->getActiveAttributes();
    auto iter = attributeInfo.find("a_position");
    if(iter != attributeInfo.end())
    {
        vertexLayout->setAttribute("a_position", iter->second.location, backend::VertexFormat::FLOAT2, 0, false);
    }
    iter = attributeInfo.find("a_texCoord");
    if(iter != attributeInfo.end())
    {
        vertexLayout->setAttribute("a_texCoord", iter->second.location, backend::VertexFormat::FLOAT2, 2 * sizeof(float), false);
    }
    iter = attributeInfo.find("a_color");
    if(iter != attributeInfo.end())
    {
        vertexLayout->setAttribute("a_color", iter->second.location, backend::VertexFormat::UBYTE4, 4 * sizeof(float), true);
    }
    vertexLayout->setLayout(4 * sizeof(float) + 4 * sizeof(uint8_t));
}
MotionStreak::~MotionStreak()
{
    CC_SAFE_RELEASE(_texture);
    CC_SAFE_FREE(_pointState);
    CC_SAFE_FREE(_pointVertexes);
    CC_SAFE_FREE(_vertices);
    CC_SAFE_FREE(_colorPointer);
    CC_SAFE_FREE(_texCoords);
}
MotionStreak* MotionStreak::create(float fade, float minSeg, float stroke, const Color3B& color, const std::string& path)
{
    MotionStreak *ret = new (std::nothrow) MotionStreak();
    if (ret && ret->initWithFade(fade, minSeg, stroke, color, path))
    {
        ret->autorelease();
        return ret;
    }
    CC_SAFE_DELETE(ret);
    return nullptr;
}
MotionStreak* MotionStreak::create(float fade, float minSeg, float stroke, const Color3B& color, Texture2D* texture)
{
    MotionStreak *ret = new (std::nothrow) MotionStreak();
    if (ret && ret->initWithFade(fade, minSeg, stroke, color, texture))
    {
        ret->autorelease();
        return ret;
    }
    CC_SAFE_DELETE(ret);
    return nullptr;
}
bool MotionStreak::initWithFade(float fade, float minSeg, float stroke, const Color3B& color, const std::string& path)
{
    CCASSERT(!path.empty(), "Invalid filename");
    Texture2D *texture = Director::getInstance()->getTextureCache()->addImage(path);
    return initWithFade(fade, minSeg, stroke, color, texture);
}
bool MotionStreak::initWithFade(float fade, float minSeg, float stroke, const Color3B& color, Texture2D* texture)
{
    Node::setPosition(Vec2::ZERO);
    setAnchorPoint(Vec2::ZERO);
    setIgnoreAnchorPointForPosition(true);
    _startingPositionInitialized = false;
    _positionR.setZero();
    _fastMode = true;
    _minSeg = (minSeg == -1.0f) ? stroke/ 5.0f : minSeg;
    _minSeg *= _minSeg;
    _stroke = stroke;
    _fadeDelta = 1.0f / fade;
    
    double fps = 1 / Director::getInstance()->getAnimationInterval();
    _maxPoints = (int)(fade * fps) + 2;
    
    _pointState = (float *)malloc(sizeof(float) * _maxPoints);
    _pointVertexes = (Vec2*)malloc(sizeof(Vec2) * _maxPoints);
    const size_t VERTEX_SIZE = sizeof(Vec2) + sizeof(Tex2F) + sizeof(uint8_t) * 4;
    _vertexCount = _maxPoints * 2;
    _vertices = (Vec2*)malloc(sizeof(Vec2) * _vertexCount);
    _texCoords = (Tex2F*)malloc(sizeof(Tex2F) * _vertexCount);
    _colorPointer =  (uint8_t*)malloc(sizeof(uint8_t) * 4 * _vertexCount);
    _customCommand.createVertexBuffer(VERTEX_SIZE, _vertexCount, CustomCommand::BufferUsage::DYNAMIC);
    std::vector<uint8_t> zeros;
    zeros.resize(VERTEX_SIZE * _vertexCount);
    std::fill(zeros.begin(), zeros.end(), 0);
    _customCommand.updateVertexBuffer(zeros.data(), zeros.size());
    setTexture(texture);
    setColor(color);
    scheduleUpdate();
    return true;
}
void MotionStreak::setPosition(const Vec2& position)
{
    if (!_startingPositionInitialized) {
        _startingPositionInitialized = true;
    }
    _positionR = position;
}
void MotionStreak::setPosition(float x, float y)
{
    if (!_startingPositionInitialized) {
        _startingPositionInitialized = true;
    }
    _positionR.x = x;
    _positionR.y = y;
}
const Vec2& MotionStreak::getPosition() const
{
    return _positionR;
}
void MotionStreak::getPosition(float* x, float* y) const
{
    *x = _positionR.x;
    *y = _positionR.y;
}
float MotionStreak::getPositionX() const
{
    return _positionR.x;
}
Vec3 MotionStreak::getPosition3D() const
{
    return Vec3(_positionR.x, _positionR.y, getPositionZ());
}
void MotionStreak::setPositionX(float x)
{
    if (!_startingPositionInitialized) {
        _startingPositionInitialized = true;
    }
    _positionR.x = x;
}
float MotionStreak::getPositionY() const
{
    return  _positionR.y;
}
void MotionStreak::setPositionY(float y)
{
    if (!_startingPositionInitialized) {
        _startingPositionInitialized = true;
    }
    _positionR.y = y;
}
void MotionStreak::tintWithColor(const Color3B& colors)
{
    setColor(colors);
    // Fast assignation
    for(unsigned int i = 0; i<_nuPoints*2; i++) 
    {
        *((Color3B*) (_colorPointer+i*4)) = colors;
    }
}
Texture2D* MotionStreak::getTexture() const
{
    return _texture;
}
void MotionStreak::setTexture(Texture2D *texture)
{
    if (_texture != texture)
    {
        CC_SAFE_RETAIN(texture);
        CC_SAFE_RELEASE(_texture);
        _texture = texture;
    }
}
void MotionStreak::setBlendFunc(const BlendFunc &blendFunc)
{
    _blendFunc = blendFunc;
}
const BlendFunc& MotionStreak::getBlendFunc() const
{
    return _blendFunc;
}
void MotionStreak::setOpacity(uint8_t /*opacity*/)
{
    CCASSERT(false, "Set opacity no supported");
}
uint8_t MotionStreak::getOpacity() const
{
    CCASSERT(false, "Opacity no supported");
    return 0;
}
void MotionStreak::setOpacityModifyRGB(bool /*bValue*/)
{
}
bool MotionStreak::isOpacityModifyRGB() const
{
    return false;
}
void MotionStreak::update(float delta)
{
    if (!_startingPositionInitialized)
        return;
    delta *= _fadeDelta;
    unsigned int newIdx, newIdx2, i, i2;
    unsigned int mov = 0;
    // Update current points
    for (i = 0; i < _nuPoints; i++)
    {
        _pointState[i] -= delta;
        if (_pointState[i] <= 0)
            mov++;
        else
        {
            newIdx = i - mov;
            if (mov > 0)
            {
                // Move data
                _pointState[newIdx] = _pointState[i];
                // Move point
                _pointVertexes[newIdx] = _pointVertexes[i];
                // Move vertices
                i2 = i * 2;
                newIdx2 = newIdx * 2;
                _vertices[newIdx2] = _vertices[i2];
                _vertices[newIdx2+1] = _vertices[i2+1];
                // Move color
                i2 *= 4;
                newIdx2 *= 4;
                _colorPointer[newIdx2+0] = _colorPointer[i2+0];
                _colorPointer[newIdx2+1] = _colorPointer[i2+1];
                _colorPointer[newIdx2+2] = _colorPointer[i2+2];
                _colorPointer[newIdx2+4] = _colorPointer[i2+4];
                _colorPointer[newIdx2+5] = _colorPointer[i2+5];
                _colorPointer[newIdx2+6] = _colorPointer[i2+6];
            }else
                newIdx2 = newIdx * 8;
            const uint8_t op = (uint8_t)(_pointState[newIdx] * 255.0f);
            _colorPointer[newIdx2+3] = op;
            _colorPointer[newIdx2+7] = op;
        }
    }
    _nuPoints -= mov;
    // Append new point
    bool appendNewPoint = true;
    if (_nuPoints >= _maxPoints)
        appendNewPoint = false;
    else if (_nuPoints > 0)
    {
        bool a1 = _pointVertexes[_nuPoints-1].getDistanceSq(_positionR) < _minSeg;
        bool a2 = (_nuPoints == 1) ? false : (_pointVertexes[_nuPoints-2].getDistanceSq(_positionR) < (_minSeg * 2.0f));
        if (a1 || a2)
            appendNewPoint = false;
    }
    if (appendNewPoint)
    {
        _pointVertexes[_nuPoints] = _positionR;
        _pointState[_nuPoints] = 1.0f;
        // Color assignment
        const unsigned int offset = _nuPoints * 8;
        *((Color3B*)(_colorPointer + offset)) = _displayedColor;
        *((Color3B*)(_colorPointer + offset+4)) = _displayedColor;
        // Opacity
        _colorPointer[offset+3] = 255;
        _colorPointer[offset+7] = 255;
        // Generate polygon
        if (_nuPoints > 0 && _fastMode )
        {
            if(_nuPoints > 1)
            {
                ccVertexLineToPolygon(_pointVertexes, _stroke, _vertices, _nuPoints, 1);
            }
            else
            {
                ccVertexLineToPolygon(_pointVertexes, _stroke, _vertices, 0, 2);
            }
        }
        _nuPoints++;
    }
    if (! _fastMode)
        ccVertexLineToPolygon(_pointVertexes, _stroke, _vertices, 0, _nuPoints);
    // Updated Tex Coords only if they are different than previous step
    if (_nuPoints  && _previousNuPoints != _nuPoints) {
        float texDelta = 1.0f / _nuPoints;
        for (i = 0; i < _nuPoints; i++) {
            _texCoords[i*2] = Tex2F(0, texDelta*i);
            _texCoords[i*2+1] = Tex2F(1, texDelta*i);
        }
        _previousNuPoints = _nuPoints;
    }
}
void MotionStreak::reset()
{
    _nuPoints = 0;
}
void MotionStreak::draw(Renderer *renderer, const Mat4 &transform, uint32_t flags)
{
    if(_nuPoints <= 1)
        return;
    auto drawCount = _nuPoints * 2;
        
    _customCommand.init(_globalZOrder, _blendFunc);
    _customCommand.setVertexDrawInfo(0, drawCount);
    renderer->addCommand(&_customCommand);
    auto programState = _customCommand.getPipelineDescriptor().programState;
    programState->setTexture(_textureLocation, 0, _texture->getBackendTexture());
    const auto& projectionMat = Director::getInstance()->getMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_PROJECTION);
    Mat4 finalMat = projectionMat * transform;
    programState->setUniform(_mvpMatrixLocaiton, finalMat.m, sizeof(Mat4));
    unsigned int offset = 0;
    unsigned int vertexSize = sizeof(Vec2) + sizeof(Vec2) + sizeof(uint8_t) * 4;
    for (unsigned int i = 0; i < drawCount; ++i)
    {
        offset = i * vertexSize;
        _customCommand.updateVertexBuffer(&_vertices[i], offset, sizeof(_vertices[0]));
        _customCommand.updateVertexBuffer(&_texCoords[i], offset + sizeof(_vertices[0]), sizeof(_texCoords[0]) );
        _customCommand.updateVertexBuffer(&_colorPointer[i * 4], offset + sizeof(_vertices[0]) + sizeof(_texCoords[0]), 4 * sizeof(uint8_t));
    }
}
NS_CC_END