ShaderTest2.cpp

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#include "ShaderTest2.h"
#include "ShaderTest.h"
#include "../testResource.h"
#include "cocos2d.h"
#include <tuple>

namespace ShaderTest2
{
    static std::function<Layer*()> createFunctions[] =
    {
        CL(EffectSpriteTest),
    };
    
    static unsigned int TEST_CASE_COUNT = sizeof(ShaderTest2::createFunctions) / sizeof(ShaderTest2::createFunctions[0]);
    
    static int sceneIdx=-1;
    Layer* createTest(int index)
    {
        auto layer = (createFunctions[index])();;
        return layer;
    }
    
    Layer* nextAction();
    Layer* backAction();
    Layer* restartAction();
    
    Layer* nextAction()
    {
        sceneIdx++;
        sceneIdx = sceneIdx % TEST_CASE_COUNT;
        
        return createTest(sceneIdx);
    }
    
    Layer* backAction()
    {
        sceneIdx--;
        if( sceneIdx < 0 )
            sceneIdx = TEST_CASE_COUNT -1;
        
        return createTest(sceneIdx);
    }
    
    Layer* restartAction()
    {
        return createTest(sceneIdx);
    }
    
}

ShaderTestDemo2::ShaderTestDemo2()
{
    
}

void ShaderTestDemo2::backCallback(Ref* sender)
{
    auto s = ShaderTestScene2::create();
    s->addChild( ShaderTest2::backAction() );
    Director::getInstance()->replaceScene(s);
}

void ShaderTestDemo2::nextCallback(Ref* sender)
{
    auto s = ShaderTestScene2::create();
    s->addChild( ShaderTest2::nextAction() );
    Director::getInstance()->replaceScene(s);
}

void ShaderTestDemo2::restartCallback(Ref* sender)
{
    auto s = ShaderTestScene2::create();
    s->addChild(ShaderTest2::restartAction());    
    Director::getInstance()->replaceScene(s);
}

void ShaderTestScene2::runThisTest()
{
    auto layer = ShaderTest2::nextAction();
    addChild(layer);
    Director::getInstance()->replaceScene(this);
}

//
// EffectSprite
//
static int tuple_sort( const std::tuple<ssize_t,Effect*,QuadCommand> &tuple1, const std::tuple<ssize_t,Effect*,QuadCommand> &tuple2 )
{
    return std::get<0>(tuple1) < std::get<0>(tuple2);
}

class Effect;
class EffectSprite : public Sprite
{
public:
    static EffectSprite *create(const std::string& filename) {
        auto ret = new (std::nothrow) EffectSprite;
        if(ret && ret->initWithFile(filename)) {
            ret->autorelease();
            return ret;
        }
        CC_SAFE_RELEASE(ret);
        return nullptr;
    }

    void setEffect(Effect* effect) {
        if(_defaultEffect != effect) {
            effect->setTarget(this);

            CC_SAFE_RELEASE(_defaultEffect);
            _defaultEffect = effect;
            CC_SAFE_RETAIN(_defaultEffect);

            setGLProgramState(_defaultEffect->getGLProgramState());
        }
    }
    void addEffect(Effect *effect, ssize_t order) {
        effect->retain();
        effect->setTarget(this);

        _effects.push_back(std::make_tuple(order,effect,QuadCommand()));

        std::sort(std::begin(_effects), std::end(_effects), tuple_sort);
    }

    void draw(Renderer *renderer, const Mat4 &transform, bool transformUpdated) override
    {
        // Don't do calculate the culling if the transform was not updated
        _insideBounds = transformUpdated ? renderer->checkVisibility(transform, _contentSize) : _insideBounds;

        if(_insideBounds)
        {
            // negative effects: order < 0
            int idx=0;
            for(auto &effect : _effects) {

                if(std::get<0>(effect) >=0)
                    break;
                QuadCommand &q = std::get<2>(effect);
                q.init(_globalZOrder, _texture->getName(), std::get<1>(effect)->getGLProgramState(), _blendFunc, &_quad, 1, transform);
                renderer->addCommand(&q);
                idx++;

            }

            // normal effect: order == 0
            _quadCommand.init(_globalZOrder, _texture->getName(), getGLProgramState(), _blendFunc, &_quad, 1, transform);
            renderer->addCommand(&_quadCommand);

            // postive effects: oder >= 0
            for(auto it = std::begin(_effects)+idx; it != std::end(_effects); ++it) {
                QuadCommand &q = std::get<2>(*it);
                q.init(_globalZOrder, _texture->getName(), std::get<1>(*it)->getGLProgramState(), _blendFunc, &_quad, 1, transform);
                renderer->addCommand(&q);
                idx++;
            }
        }
    }
protected:
    EffectSprite() : _defaultEffect(nullptr)
    {
        _effects.reserve(2);
    }
    ~EffectSprite() {
        for(auto &tuple : _effects) {
            std::get<1>(tuple)->release();
        }
        CC_SAFE_RELEASE(_defaultEffect);
    }

    std::vector<std::tuple<ssize_t,Effect*,QuadCommand>> _effects;
    Effect* _defaultEffect;
};

//
// Effect
//

bool Effect::initGLProgramState(const std::string &fragmentFilename)
{
    auto fileUtiles = FileUtils::getInstance();
    auto fragmentFullPath = fileUtiles->fullPathForFilename(fragmentFilename);
    auto fragSource = fileUtiles->getStringFromFile(fragmentFullPath);
    auto glprogram = GLProgram::createWithByteArrays(ccPositionTextureColor_noMVP_vert, fragSource.c_str());

    _glprogramstate = GLProgramState::getOrCreateWithGLProgram(glprogram);
    _glprogramstate->retain();

    return _glprogramstate != nullptr;
}

// Blur
class EffectBlur : public Effect
{
public:
    CREATE_FUNC(EffectBlur);

    virtual void setTarget(EffectSprite *sprite) override;

    void setGaussian(float value);
    void setCustomUniforms();
    void setBlurSize(float f);

protected:
    bool init(float blurSize=3.0);

    int       _blurRadius;
    Vec2   _pixelSize;

    int       _samplingRadius;
    float     _scale;
    float     _cons;
    float     _weightSum;
};

void EffectBlur::setTarget(EffectSprite *sprite)
{
    Size s = sprite->getTexture()->getContentSizeInPixels();
    _pixelSize = Vec2(1/s.width, 1/s.height);
    _glprogramstate->setUniformVec2("onePixelSize", _pixelSize);
}

bool EffectBlur::init(float blurSize)
{
    initGLProgramState("Shaders/example_Blur.fsh");
    auto s = Size(100,100);

    _blurRadius = 0;
    _pixelSize = Vec2(1/s.width, 1/s.height);
    _samplingRadius = 0;

    setBlurSize(blurSize);

    _glprogramstate->setUniformVec2("onePixelSize", _pixelSize);
    _glprogramstate->setUniformVec4("gaussianCoefficient", Vec4(_samplingRadius, _scale, _cons, _weightSum));
    return true;
}

void EffectBlur::setBlurSize(float f)
{
    if(_blurRadius == (int)f)
        return;
    _blurRadius = (int)f;

    _samplingRadius = _blurRadius;
    if (_samplingRadius > 10)
    {
        _samplingRadius = 10;
    }
    if (_blurRadius > 0)
    {
        float sigma = _blurRadius / 2.0f;
        _scale = -0.5f / (sigma * sigma);
        _cons = -1.0f * _scale / 3.141592f;
        _weightSum = -_cons;

        float weight;
        int squareX;
        for(int dx = 0; dx <= _samplingRadius; ++dx)
        {
            squareX = dx * dx;
            weight = _cons * exp(squareX * _scale);
            _weightSum += 2.0 * weight;
            for (int dy = 1; dy <= _samplingRadius; ++dy)
            {
                weight = _cons * exp((squareX + dy * dy) * _scale);
                _weightSum += 4.0 * weight;
            }
        }
    }
}

// Outline
class EffectOutline : public Effect
{
public:
    CREATE_FUNC(EffectOutline);

    bool init()
    {
        initGLProgramState("Shaders/example_outline.fsh");

        Vec3 color(1.0, 0.2, 0.3);
        GLfloat radius = 0.01;
        GLfloat threshold = 1.75;

        _glprogramstate->setUniformVec3("u_outlineColor", color);
        _glprogramstate->setUniformFloat("u_radius", radius);
        _glprogramstate->setUniformFloat("u_threshold", threshold);
        return true;
    }
};

// Noise
class EffectNoise : public Effect
{
public:
    CREATE_FUNC(EffectNoise);

protected:
    bool init() {
        initGLProgramState("Shaders/example_Noisy.fsh");
        return true;
    }

    virtual void setTarget(EffectSprite* sprite) override
    {
        auto s = sprite->getTexture()->getContentSizeInPixels();
        getGLProgramState()->setUniformVec2("resolution", Vec2(s.width, s.height));
    }
};

// Edge Detect
class EffectEdgeDetect : public Effect
{
public:
    CREATE_FUNC(EffectEdgeDetect);

protected:
    bool init() {
        initGLProgramState("Shaders/example_edgeDetection.fsh");
        return true;
    }

    virtual void setTarget(EffectSprite* sprite) override
    {
        auto s = sprite->getTexture()->getContentSizeInPixels();
        getGLProgramState()->setUniformVec2("resolution", Vec2(s.width, s.height));
    }
};

// Grey
class EffectGreyScale : public Effect
{
public:
    CREATE_FUNC(EffectGreyScale);

protected:
    bool init() {
        initGLProgramState("Shaders/example_greyScale.fsh");
        return true;
    }
};

// Sepia
class EffectSepia : public Effect
{
public:
    CREATE_FUNC(EffectSepia);

protected:
    bool init() {
        initGLProgramState("Shaders/example_sepia.fsh");
        return true;
    }
};

// bloom
class EffectBloom : public Effect
{
public:
    CREATE_FUNC(EffectBloom);

protected:
    bool init() {
        initGLProgramState("Shaders/example_bloom.fsh");
        return true;
    }

    virtual void setTarget(EffectSprite* sprite) override
    {
        auto s = sprite->getTexture()->getContentSizeInPixels();
        getGLProgramState()->setUniformVec2("resolution", Vec2(s.width, s.height));
    }
};

// cel shading
class EffectCelShading : public Effect
{
public:
    CREATE_FUNC(EffectCelShading);

protected:
    bool init() {
        initGLProgramState("Shaders/example_celShading.fsh");
        return true;
    }

    virtual void setTarget(EffectSprite* sprite) override
    {
        auto s = sprite->getTexture()->getContentSizeInPixels();
        getGLProgramState()->setUniformVec2("resolution", Vec2(s.width, s.height));
    }
};

// Lens Flare
class EffectLensFlare : public Effect
{
public:
    CREATE_FUNC(EffectLensFlare);

protected:
    bool init() {
        initGLProgramState("Shaders/example_lensFlare.fsh");
        return true;
    }

    virtual void setTarget(EffectSprite* sprite) override
    {
        auto s = sprite->getTexture()->getContentSizeInPixels();
        getGLProgramState()->setUniformVec2("textureResolution", Vec2(s.width, s.height));

        s = Director::getInstance()->getWinSize();
        getGLProgramState()->setUniformVec2("resolution", Vec2(s.width, s.height));

    }
};


EffectSpriteTest::EffectSpriteTest()
{
    if (ShaderTestDemo2::init()) {

        auto s = Director::getInstance()->getWinSize();

        auto itemPrev = MenuItemImage::create("Images/b1.png", "Images/b2.png",
                                          [&](Ref *sender) {
                                              _vectorIndex--;
                                              if(_vectorIndex<0)
                                                  _vectorIndex = _effects.size()-1;
                                              _sprite->setEffect(_effects.at(_vectorIndex));
                                          });

        auto itemNext = MenuItemImage::create("Images/f1.png", "Images/f2.png",
                                          [&](Ref *sender) {
                                              _vectorIndex++;
                                              if(_vectorIndex>=_effects.size())
                                                  _vectorIndex = 0;
                                              _sprite->setEffect(_effects.at(_vectorIndex));
                                          });

        auto menu = Menu::create(itemPrev, itemNext, NULL);
        menu->alignItemsHorizontally();
        menu->setScale(0.5);
        menu->setAnchorPoint(Vec2(0,0));
        menu->setPosition(Vec2(s.width/2,70));
        addChild(menu);

        _sprite = EffectSprite::create("Images/grossini.png");
        _sprite->setPosition(Vec2(0, s.height/2));
        addChild(_sprite);

        auto jump = JumpBy::create(4, Vec2(s.width,0), 100, 4);
        auto rot = RotateBy::create(4, 720);
        auto spawn = Spawn::create(jump, rot, NULL);
        auto rev = spawn->reverse();
        auto seq = Sequence::create(spawn, rev, NULL);
        auto repeat = RepeatForever::create(seq);
        _sprite->runAction(repeat);

        // set the Effects
        _effects.pushBack(EffectBlur::create());
        _effects.pushBack(EffectOutline::create());
        _effects.pushBack(EffectNoise::create());
        _effects.pushBack(EffectEdgeDetect::create());
        _effects.pushBack(EffectGreyScale::create());
        _effects.pushBack(EffectSepia::create());
        _effects.pushBack(EffectBloom::create());
        _effects.pushBack(EffectCelShading::create());
        _effects.pushBack(EffectLensFlare::create());

        _vectorIndex = 0;
        _sprite->setEffect( _effects.at(_vectorIndex) );

//        _sprite->addEffect( _effects.at(8), -10 );
//        _sprite->addEffect( _effects.at(1), 1 );

    }
}